image
imagewidth (px) 53
760
⌀ | question
stringlengths 14
862
| choices
sequencelengths 2
5
| answer
int8 0
4
| hint
stringlengths 0
1.85k
| task
stringclasses 3
values | grade
stringclasses 12
values | subject
stringclasses 3
values | topic
stringclasses 26
values | category
stringclasses 119
values | skill
stringclasses 321
values | lecture
stringclasses 256
values | solution
stringlengths 0
2.72k
|
|---|---|---|---|---|---|---|---|---|---|---|---|---|
What is the capital of Indiana? | [
"Indianapolis",
"Des Moines",
"Fort Wayne",
"Jefferson City"
] | 0 | closed choice | grade3 | social science | geography | State capitals | Identify state capitals of the Midwest | Indianapolis is the capital of Indiana. |
|||
Which of the following could Hansen's test show? | [
"how much athletes would sweat in the fabric",
"how long it would take the sample fabric to dry after it absorbed one drop of water",
"if the sample fabric would absorb one drop of water in less than one second"
] | 1 | People can use the engineering-design process to develop solutions to problems. One step in the process is testing if a potential solution meets the requirements of the design.
The passage below describes how the engineering-design process was used to test a solution to a problem. Read the passage. Then answer the question below.
Hansen, a materials engineer, was developing a quick-drying fabric for athletic clothing. The fabric needed to absorb one drop of water in less than one second and dry completely in less than five minutes. Hansen thought a fabric made from cotton and polyester would both absorb water well and dry quickly. But he needed to decide what percentage of each material to use.
So, he made a sample fabric that was 50% cotton and 50% polyester. Then he put one drop of water on the sample. He timed how long it took the fabric to dry after the water was absorbed.
Figure: fabric that has not absorbed drops of water. | closed choice | grade8 | natural science | science-and-engineering-practices | Engineering practices | Evaluate tests of engineering-design solutions | People can use the engineering-design process to develop solutions to problems. One step in the process is testing if a potential solution meets the requirements of the design. How can you determine what a test can show? You need to figure out what was tested and what was measured.
Imagine an engineer needs to design a bridge for a windy location. She wants to make sure the bridge will not move too much in high wind. So, she builds a smaller prototype, or model, of a bridge. Then, she exposes the prototype to high winds and measures how much the bridge moves.
First, identify what was tested. A test can examine one design, or it may compare multiple prototypes to each other. In the test described above, the engineer tested a prototype of a bridge in high wind.
Then, identify what the test measured. One of the criteria for the bridge was that it not move too much in high winds. The test measured how much the prototype bridge moved.
Tests can show how well one or more designs meet the criteria. The test described above can show whether the bridge would move too much in high winds. | ||
Not supported with pagination yet | Choose the poem that uses onomatopoeia. | [
"I have seen the proudest stars\nThat wander on through space,\nEven the sun and moon,\nBut not your face.",
"Ay, bring the hillside beech\nFrom where the owlets meet and screech,\nAnd ravens croak;\nThe crackling pine, and cedar sweet"
] | 1 | From Robert Hinckley Messenger, "Give Me the Old" and from Helen Dudley, "To One Unknown" | closed choice | grade9 | language science | reading-comprehension | Analyzing literature | Identify elements of poetry | Poets often use the sounds of words to create interesting effects and to express moods and emotions. Understanding these elements of poetry can help you better interpret and appreciate poetic forms.
Anaphora is the repetition of words or sequences of words at the beginning of multiple phrases, sentences, or lines.
Out of the cradle endlessly rocking,
Out of the mocking-bird's throat, the musical shuttle,
Out of the Ninth-month midnight
—From Walt Whitman, "Out of the Cradle Endlessly Rocking"
Onomatopoeia is when language sounds like what it talks about.
Sometimes the onomatopoeia uses made-up words:
Tlot-tlot! tlot-tlot! Had they heard it? The horse hoofs ringing clear.
—From Alfred Noyes, "The Highwayman"
Sometimes the onomatopoeia uses real words:
Hark! the honey bee is humming.
—From Mary Howitt, "The Voice of Spring"
Alliteration is when beginning consonant sounds are repeated in words that are close together.
Where the wild men watched and waited
Wolves in the forest, and bears in the bush.
—From Bayard Taylor, "A Night with a Wolf"
Assonance is the repetition of vowel sounds. Often, assonance can create rhymes or near-rhymes within lines.
I wandered lonely as a Cloud
That floats on high o'er Vales and Hills,
When all at once I saw a crowd,
A host of golden Daffodils.
—From William Wordsworth, "I Wandered Lonely as a Cloud"
Meter is a poem's rhythm, or the pattern of strong and weak syllables. Strong syllables are stressed, while weak syllables are unstressed.
A poem has an iambic meter when the beat sounds like da-DUM. A weak syllable is followed by a strong syllable. Occasionally, a line may begin with a strong syllable.
He watches from his mountain walls,
And like a thunderbolt he falls.
—From Alfred, Lord Tennyson, "The Eagle"
A poem has a trochaic meter when the beat sounds like DUM-da. A strong syllable is followed by a weak syllable. Occasionally, a line may end in a strong syllable.
Back into the chamber turning, all my soul within me burning,
Soon again I heard a tapping somewhat louder than before.
—From Edgar Allen Poe, "The Raven"
Free verse is when a poem has neither a regular rhythm nor a rhyme pattern.
The old bridge has a wrinkled face.
He bends his back
For us to go over.
—From Hilda Conkling, "The Old Bridge"
The syllables in bold are strong. You can see this poem does not have a regular rhythm. It also doesn't have a rhyme pattern. | This poem uses onomatopoeia. It uses language that sounds like what it talks about. |
Which property do these four objects have in common? | [
"opaque",
"flexible",
"shiny"
] | 0 | Select the best answer. | closed choice | grade5 | natural science | physics | Materials | Compare properties of objects | An object has different properties. A property of an object can tell you how it looks, feels, tastes, or smells. Properties can also tell you how an object will behave when something happens to it.
Different objects can have properties in common. You can use these properties to put objects into groups. Grouping objects by their properties is called classification. | Look at each object.
For each object, decide if it has that property.
An opaque object does not let light through. All four objects are opaque.
A flexible object can be folded or bent without breaking easily. The tin foil is flexible, but the bowling ball and the metal nail are not.
A shiny object reflects a lot of light. You can usually see your reflection in a shiny object. The tin foil is shiny, but the banana is not.
The property that all four objects have in common is opaque. |
|
Not supported with pagination yet | Which type of sentence is this?
Dominic took several incredible panoramic photographs of the sweeping view from the top of Table Mountain. | [
"compound",
"compound-complex",
"simple",
"complex"
] | 2 | closed choice | grade12 | language science | grammar | Phrases and clauses | Is the sentence simple, compound, complex, or compound-complex? | A clause is a group of words that contains both a subject and a predicate.
An independent clause is a complete thought that can stand alone as a sentence. A dependent clause (or subordinate clause) is not a complete thought and cannot stand alone as a sentence.
the oranges on our tree are ripe
The clause can stand alone. It is independent.
after we pick up Kevin from work
The clause cannot stand alone. It is dependent.
A simple sentence is made up of a single independent clause.
Ben and I spent all day relaxing by the pool.
Some simple sentences have introductory phrases, but the introductory phrase is part of the predicate.
In the winter, Ben usually wears his heavy coat.
Ben usually wears his heavy coat in the winter.
A compound sentence is made up of two independent clauses joined by a coordinating conjunction such as and, but, or, or so.
We saw the flash of lightning, and seconds later we heard a rumble of thunder.
A complex sentence is made up of an independent clause and a dependent clause. The dependent clause in a complex sentence usually begins with a subordinating conjunction or relative pronoun. Subordinating conjunctions include after, although, as, because, before, if, since, unless, until, when, and while. Relative pronouns include that, which, who, whom, or whose.
If she ever gets the chance, Terri would love to visit the Egyptian pyramids.
During his trip to Italy, Tony visited the Trevi Fountain, which is in Rome.
A compound-complex sentence is made up of two or more independent clauses and one or more dependent clauses.
After Samantha left work, she stopped at the bank, and then she went to the gym.
Sometimes a dependent clause in a complex or compound-complex sentence can interrupt an independent clause.
Orcas that are kept in captivity often have bent dorsal fins. | The sentence is simple. It is a single independent clause.
Dominic took several incredible panoramic photographs of the sweeping view from the top of Table Mountain. |
|
Which property matches this object? | [
"shiny",
"bumpy"
] | 1 | Select the better answer. | closed choice | grade2 | natural science | physics | Materials | Identify properties of an object | An object has different properties. A property of an object can tell you how it looks, feels, tastes, or smells. | Look at the object.
Think about each property.
A bumpy object is covered in lumps and bumps. The log is bumpy.
A shiny object reflects a lot of light. The log is not shiny. |
|
Not supported with pagination yet | Is the following trait inherited or acquired?
Lexi is good at cooking. | [
"inherited",
"acquired"
] | 1 | Hint: Cooking well takes practice. | closed choice | grade4 | natural science | biology | Traits and heredity | Identify inherited and acquired traits | Organisms, including people, have both inherited and acquired traits. Inherited and acquired traits are gained in different ways.
Inherited traits are passed down through families. Children gain these traits from their parents. Inherited traits do not need to be learned.
Acquired traits are gained during a person's life. Some acquired traits, such as riding a bicycle, are gained by learning. Other acquired traits, such as scars, are caused by the environment. Children do not inherit their parents' acquired traits. | People are not born knowing how to cook. Instead, many people learn how to cook. So, cooking is an acquired trait. |
Which ocean is highlighted? | [
"the Atlantic Ocean",
"the Pacific Ocean",
"the Southern Ocean",
"the Arctic Ocean"
] | 0 | closed choice | grade7 | social science | geography | Physical Geography | Oceans and continents | Oceans are huge bodies of salt water. The world has five oceans. All of the oceans are connected, making one world ocean. | This is the Atlantic Ocean. |
||
Not supported with pagination yet | What information supports the conclusion that Judith inherited this trait? | [
"Judith's parents have dark skin. They passed down this trait to Judith.",
"Judith and her father both have dark hair."
] | 0 | Read the description of a trait.
Judith has dark skin. | closed choice | grade6 | natural science | biology | Genes to traits | Inherited and acquired traits: use evidence to support a statement | Organisms, including people, have both inherited and acquired traits. Inherited and acquired traits are gained in different ways.
Inherited traits are passed down from biological parents to their offspring through genes. Genes are pieces of hereditary material that contain the instructions that affect inherited traits. Offspring receive their genes, and therefore gain their inherited traits, from their biological parents. Inherited traits do not need to be learned.
Acquired traits are gained during a person's life. Some acquired traits, such as riding a bicycle, are gained by learning. Other acquired traits, such as scars, are caused by the environment. Parents do not pass acquired traits down to their offspring. | |
Will these magnets attract or repel each other? | [
"attract",
"repel"
] | 0 | Two magnets are placed as shown.
Hint: Magnets that attract pull together. Magnets that repel push apart. | closed choice | grade2 | natural science | physics | Magnets | Identify magnets that attract or repel | Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart.
Whether a magnet attracts or repels other magnets depends on the positions of its poles, or ends. Every magnet has two poles, called north and south.
Here are some examples of magnets. The north pole of each magnet is marked N, and the south pole is marked S.
If different poles are closest to each other, the magnets attract. The magnets in the pair below attract.
If the same poles are closest to each other, the magnets repel. The magnets in both pairs below repel.
| Will these magnets attract or repel? To find out, look at which poles are closest to each other.
The south pole of one magnet is closest to the north pole of the other magnet. Poles that are different attract. So, these magnets will attract each other. |
|
Think about the magnetic force between the magnets in each pair. Which of the following statements is true? | [
"The magnitude of the magnetic force is smaller in Pair 1.",
"The magnitude of the magnetic force is smaller in Pair 2.",
"The magnitude of the magnetic force is the same in both pairs."
] | 1 | The images below show two pairs of magnets. The magnets in different pairs do not affect each other. All the magnets shown are made of the same material, but some of them are different shapes. | closed choice | grade8 | natural science | physics | Velocity, acceleration, and forces | Compare magnitudes of magnetic forces | Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart. These pulls and pushes between magnets are called magnetic forces.
The strength of a force is called its magnitude. The greater the magnitude of the magnetic force between two magnets, the more strongly the magnets attract or repel each other.
You can change the magnitude of a magnetic force between two magnets by changing the distance between them. The magnitude of the magnetic force is smaller when there is a greater distance between the magnets. | Distance affects the magnitude of the magnetic force. When there is a greater distance between magnets, the magnitude of the magnetic force between them is smaller.
There is a greater distance between the magnets in Pair 2 than in Pair 1. So, the magnitude of the magnetic force is smaller in Pair 2 than in Pair 1. |
|
Does this passage describe the weather or the climate? | [
"weather",
"climate"
] | 1 | Figure: Nassau.
Nassau, a city in the Bahamas, has many tourists each winter. Because the city is in the tropics, the air is usually humid.
Hint: Weather is what the atmosphere is like at a certain place and time. Climate is the pattern of weather in a certain place. | closed choice | grade6 | natural science | earth-science | Weather and climate | Weather and climate around the world | The atmosphere is the layer of air that surrounds Earth. Both weather and climate tell you about the atmosphere.
Weather is what the atmosphere is like at a certain place and time. Weather can change quickly. For example, the temperature outside your house might get higher throughout the day.
Climate is the pattern of weather in a certain place. For example, summer temperatures in New York are usually higher than winter temperatures. | Read the passage carefully.
Nassau, a city in the Bahamas, has many tourists each winter. Because the city is in the tropics, the air is usually humid.
The underlined part of the passage tells you about the usual pattern of humidity in Nassau. This passage does not describe what the weather is like on a particular day. So, this passage describes the climate. |
|
Which animal is also adapted to be camouflaged among dead leaves? | [
"fantastic leaf-tailed gecko",
"Arctic wolf"
] | 0 | Leaf-mimic grasshoppers live in tropical forests around the world. This grasshopper is adapted to be camouflaged among dead leaves.
Figure: leaf-mimic grasshopper. | closed choice | grade3 | natural science | biology | Adaptations | Animal adaptations: skins and body coverings | An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors.
The color, texture, and covering of an animal's skin are examples of adaptations. Animals' skins can be adapted in different ways. For example, skin with thick fur might help an animal stay warm. Skin with sharp spines might help an animal defend itself against predators. | Look at the picture of the leaf-mimic grasshopper.
The leaf-mimic grasshopper has a reddish-brown body. It is adapted to be camouflaged among dead leaves, which often have a reddish or brownish color. The word camouflage means to blend in.
Now look at each animal. Figure out which animal has a similar adaptation.
The fantastic leaf-tailed gecko has reddish-brown skin and a leaf-shaped tail. It is adapted to be camouflaged among dead leaves, which often have a reddish or brownish color.
This Arctic wolf has white fur covering its body. It is not adapted to be camouflaged among dead leaves. |
|
Not supported with pagination yet | Select the invertebrate. | [
"saturn butterfly",
"robin",
"Galapagos giant tortoise",
"ground squirrel"
] | 0 | Hint: Insects, spiders, and worms are invertebrates. | closed choice | grade5 | natural science | biology | Classification | Identify vertebrates and invertebrates | Vertebrates and invertebrates are both groups of animals.
A vertebrate has a backbone. The backbone is made of many bones in an animal's back. A vertebrate's backbone helps connect the different parts of its body. In the drawings below, each vertebrate's backbone is colored orange.
An invertebrate does not have a backbone. In fact, invertebrates do not have any bones! Some invertebrates have an outer cover on their body called an exoskeleton. Other invertebrates have a soft body. | A saturn butterfly is an insect. Like other insects, a saturn butterfly is an invertebrate. It does not have a backbone. It has an exoskeleton.
A ground squirrel is a mammal. Like other mammals, a ground squirrel is a vertebrate. It has a backbone.
A Galapagos giant tortoise is a reptile. Like other reptiles, a Galapagos giant tortoise is a vertebrate. It has a backbone.
A robin is a bird. Like other birds, a robin is a vertebrate. It has a backbone. |
Not supported with pagination yet | What information supports the conclusion that Deb inherited this trait? | [
"Deb and her mother both have short hair.",
"Deb's parents were born with wavy hair. They passed down this trait to Deb."
] | 1 | Read the description of a trait.
Deb has wavy hair. | closed choice | grade5 | natural science | biology | Traits and heredity | Inherited and acquired traits: use evidence to support a statement | Organisms, including people, have both inherited and acquired traits. Inherited and acquired traits are gained in different ways.
Inherited traits are passed down through families. Children gain these traits from their parents. Inherited traits do not need to be learned.
Acquired traits are gained during a person's life. Some acquired traits, such as riding a bicycle, are gained by learning. Other acquired traits, such as scars, are caused by the environment. | |
What is the capital of Nebraska? | [
"Topeka",
"Lincoln",
"Omaha",
"Pierre"
] | 1 | closed choice | grade3 | social science | geography | State capitals | Identify state capitals of the Midwest | Lincoln is the capital of Nebraska. |
|||
Not supported with pagination yet | Using only these supplies, which question can Mason investigate with an experiment? | [
"When hung in the laundry room, do black cloth towels or white cloth towels dry more quickly?",
"Do cloth towels dry faster if they are hung in the laundry room or in the backyard?",
"Does a small cloth towel or a large cloth towel dry faster when hung in the backyard?"
] | 1 | After Mason cleans up a spill, he hangs a wet cloth towel in the laundry room. Two hours later, he notices that the towel has partially dried. He wonders what factors affect how cloth dries. So, he decides to design an experiment. He has the following supplies available:
two identical white cloth towels
water
a clothesline in the laundry room
a clothesline in the backyard | closed choice | grade6 | natural science | science-and-engineering-practices | Designing experiments | Identify questions that can be investigated with a set of materials | Experiments can be designed to answer specific questions. When designing an experiment, you must identify the supplies that are necessary to answer your question. In order to do this, you need to figure out what will be tested and what will be measured during the experiment.
Imagine that you are wondering if plants grow to different heights when planted in different types of soil. How might you decide what supplies are necessary to conduct this experiment?
First, you need to identify the part of the experiment that will be tested, which is the independent variable. This is usually the part of the experiment that is different or changed. In this case, you would like to know how plants grow in different types of soil. So, you must have different types of soil available.
Next, you need to identify the part of the experiment that will be measured or observed, which is the dependent variable. In this experiment, you would like to know if some plants grow taller than others. So, you must be able to compare the plants' heights. To do this, you can observe which plants are taller by looking at them, or you can measure their exact heights with a meterstick.
So, if you have different types of soil and can observe or measure the heights of your plants, then you have the supplies you need to investigate your question with an experiment! | |
Not supported with pagination yet | Which greeting is correct for a letter? | [
"Dear Uncle Danny,",
"dear Uncle Danny,"
] | 0 | closed choice | grade2 | language science | capitalization | Capitalization | Greetings and closings of letters | A letter starts with a greeting and ends with a closing. For each one, capitalize the first word and end with a comma. You should also capitalize proper nouns, such as Aunt Sue.
Dear Aunt Sue,
I'm glad you could come to my party, and
thank you for the birthday gift. I could not have
asked for a better one! Every time I see it, I think
of you.
With love,
Rory | The first greeting is correct:
Its first word is capitalized, and it ends with a comma. Uncle Danny is capitalized because it is a proper noun. |
|
Select the organism in the same species as the garden hyacinth. | [
"Hyacinthus orientalis",
"Ovis orientalis",
"Nerodia cyclopion"
] | 0 | This organism is a garden hyacinth. Its scientific name is Hyacinthus orientalis. | closed choice | grade8 | natural science | biology | Classification and scientific names | Use scientific names to classify organisms | Scientists use scientific names to identify organisms. Scientific names are made of two words.
The first word in an organism's scientific name tells you the organism's genus. A genus is a group of organisms that share many traits.
A genus is made up of one or more species. A species is a group of very similar organisms. The second word in an organism's scientific name tells you its species within its genus.
Together, the two parts of an organism's scientific name identify its species. For example Ursus maritimus and Ursus americanus are two species of bears. They are part of the same genus, Ursus. But they are different species within the genus. Ursus maritimus has the species name maritimus. Ursus americanus has the species name americanus.
Both bears have small round ears and sharp claws. But Ursus maritimus has white fur and Ursus americanus has black fur.
| A garden hyacinth's scientific name is Hyacinthus orientalis.
Nerodia cyclopion does not have the same scientific name as a garden hyacinth. So, Hyacinthus orientalis and Nerodia cyclopion are not in the same species.
Hyacinthus orientalis has the same scientific name as a garden hyacinth. So, these organisms are in the same species.
Ovis orientalis does have the same species within its genus as a garden hyacinth, but they are not in the same genus! They do not have the same scientific name as each other. So, these organisms are not in the same species. |
|
Which property do these four objects have in common? | [
"slippery",
"smooth",
"hard"
] | 1 | Select the best answer. | closed choice | grade5 | natural science | physics | Materials | Compare properties of objects | An object has different properties. A property of an object can tell you how it looks, feels, tastes, or smells. Properties can also tell you how an object will behave when something happens to it.
Different objects can have properties in common. You can use these properties to put objects into groups. Grouping objects by their properties is called classification. | Look at each object.
For each object, decide if it has that property.
A hard object does not change shape when pressed or squeezed. The wet ice cube, the magnifying glass, and the silver ring are hard, but the balloon is not.
A smooth object is not scratchy or rough. All four objects are smooth.
A slippery object is hard to hold onto or stand on. The wet ice cube is slippery, but the balloon and the magnifying glass are not.
The property that all four objects have in common is smooth. |
|
What is the name of the colony shown? | [
"Florida",
"Indiana",
"Connecticut",
"New Jersey"
] | 3 | closed choice | grade8 | social science | us-history | Colonial America | Identify the Thirteen Colonies | The colony is New Jersey. |
|||
Not supported with pagination yet | Select the vertebrate. | [
"red-kneed tarantula",
"giant octopus",
"red-tailed hawk",
"castor bean tick"
] | 2 | Hint: Mammals, birds, fish, reptiles, and amphibians are vertebrates. | closed choice | grade5 | natural science | biology | Classification | Identify vertebrates and invertebrates | Vertebrates and invertebrates are both groups of animals.
A vertebrate has a backbone. The backbone is made of many bones in an animal's back. A vertebrate's backbone helps connect the different parts of its body. In the drawings below, each vertebrate's backbone is colored orange.
An invertebrate does not have a backbone. In fact, invertebrates do not have any bones! Some invertebrates have an outer cover on their body called an exoskeleton. Other invertebrates have a soft body. | Like other tarantulas, a red-kneed tarantula is an invertebrate. It does not have a backbone. It has an exoskeleton.
Like other octopuses, a giant octopus is an invertebrate. It does not have a backbone. It has a soft body.
A castor bean tick is an insect. Like other insects, a castor bean tick is an invertebrate. It does not have a backbone. It has an exoskeleton.
A red-tailed hawk is a bird. Like other birds, a red-tailed hawk is a vertebrate. It has a backbone. |
Not supported with pagination yet | Select the deep sea ecosystem. | [
"This ecosystem has:\nwater at the bottom of the ocean\nno sunlight\norganisms that crawl or stick to the ground",
"This ecosystem has:\nshallow, salty water\nbright sunlight\nmany different types of organisms"
] | 0 | closed choice | grade4 | natural science | biology | Ecosystems | Identify ecosystems | An environment includes all of the biotic, or living, and abiotic, or nonliving, things in an area. An ecosystem is created by the relationships that form among the biotic and abiotic parts of an environment.
There are many different types of ecosystems. Here are some ways in which these ecosystems can differ from each other:
the pattern of weather, or climate
the type of soil or water
the organisms that live there | A deep sea is a type of ecosystem. It has water at the bottom of the ocean, no sunlight, and organisms that crawl or stick to the ground.
Choice 1 is a deep sea ecosystem. It is at the bottom of the ocean. It is so far underwater that no sunlight can reach it.
Choice 2 is a tropical coral reef ecosystem. It has shallow water and many different types of organisms. |
|
Not supported with pagination yet | Which ping pong ball has a higher temperature? | [
"the ping pong ball with more thermal energy",
"the ping pong ball with less thermal energy"
] | 0 | Two ping pong balls are identical except for their thermal energies. | closed choice | grade6 | natural science | physics | Thermal energy | How are temperature and mass related to thermal energy? | Matter is made of tiny particles called atoms. Atoms are always moving.
The energy of moving atoms is called thermal energy. The total amount of thermal energy in matter depends on three things: the type of matter, the amount of matter, and how fast the atoms are moving.
Temperature measures how hot or cold matter is. If the atoms in matter move faster, the temperature goes up. The matter now has both more thermal energy and a higher temperature.
What happens if the amount of matter changes? A 2-kilogram brick at 70°F has twice as much thermal energy as a 1-kilogram brick at 70°F. The two bricks have the same temperature, but the larger brick has twice as many atoms. So, it has twice as much thermal energy. | The two ping pong balls are made of the same material and have the same mass. So, the ping pong ball with more thermal energy has a higher temperature. |
Which property matches this object? | [
"scratchy",
"shiny"
] | 0 | Select the better answer. | closed choice | grade2 | natural science | physics | Materials | Identify properties of an object | An object has different properties. A property of an object can tell you how it looks, feels, tastes, or smells. | Look at the object.
Think about each property.
A scratchy object is rough and itchy against your skin. The velcro is scratchy.
A shiny object reflects a lot of light. The velcro is not shiny. |
|
Compare the average kinetic energies of the particles in each sample. Which sample has the higher temperature? | [
"sample A",
"neither; the samples have the same temperature",
"sample B"
] | 2 | The diagrams below show two pure samples of gas in identical closed, rigid containers. Each colored ball represents one gas particle. Both samples have the same number of particles. | closed choice | grade6 | natural science | physics | Particle motion and energy | Identify how particle motion affects temperature and pressure | The temperature of a substance depends on the average kinetic energy of the particles in the substance. The higher the average kinetic energy of the particles, the higher the temperature of the substance.
The kinetic energy of a particle is determined by its mass and speed. For a pure substance, the greater the mass of each particle in the substance and the higher the average speed of the particles, the higher their average kinetic energy. | The particles in both samples have the same average speed, but each particle in sample B has more mass than each particle in sample A. So, the particles in sample B have a higher average kinetic energy than the particles in sample A.
Because the particles in sample B have the higher average kinetic energy, sample B must have the higher temperature. |
|
Identify the question that Simon's experiment can best answer. | [
"Does temperature affect how much bacteria can grow in liquid?",
"Do more bacteria grow in liquid with cinnamon than in liquid without cinnamon?"
] | 1 | The passage below describes an experiment. Read the passage and then follow the instructions below.
Simon mixed bacteria into a nutrient-rich liquid where the bacteria could grow. He poured four ounces of the mixture into each of ten glass flasks. In five of the ten flasks, he also added one teaspoon of cinnamon. He allowed the bacteria in the flasks to grow overnight in a 37°C room. Then, Simon used a microscope to count the number of bacteria in a small sample from each flask. He compared the amount of bacteria in the liquid with cinnamon to the amount of bacteria in the liquid without cinnamon.
Figure: flasks of liquid for growing bacteria. | closed choice | grade6 | natural science | science-and-engineering-practices | Designing experiments | Identify the experimental question | Experiments can be designed to answer specific questions. How can you identify the questions that a certain experiment can answer? In order to do this, you need to figure out what was tested and what was measured during the experiment.
Imagine an experiment with two groups of daffodil plants. One group of plants was grown in sandy soil, and the other was grown in clay soil. Then, the height of each plant was measured.
First, identify the part of the experiment that was tested. The part of an experiment that is tested usually involves the part of the experimental setup that is different or changed. In the experiment described above, each group of plants was grown in a different type of soil. So, the effect of growing plants in different soil types was tested.
Then, identify the part of the experiment that was measured. The part of the experiment that is measured may include measurements and calculations. In the experiment described above, the heights of the plants in each group were measured.
Experiments can answer questions about how the part of the experiment that is tested affects the part that is measured. So, the experiment described above can answer questions about how soil type affects plant height.
Examples of questions that this experiment can answer include:
Does soil type affect the height of daffodil plants?
Do daffodil plants in sandy soil grow taller than daffodil plants in clay soil?
Are daffodil plants grown in sandy soil shorter than daffodil plants grown in clay soil? | ||
Why might raising cubs with other lionesses in a pride increase an African lioness's reproductive success? Complete the claim below that answers this question and is best supported by the passage.
Raising cubs with other lionesses in a pride increases the chances that (). | [
"the lioness's cubs will be around other cubs",
"the lioness's cubs will survive attacks",
"the lioness will feed the cubs of other lionesses"
] | 1 | Animals often behave in certain ways that can increase their reproductive success. Read the passage about a specific animal behavior. Then, follow the instructions below.
African lions live in groups called prides. In a pride, female lions, or lionesses, may give birth to cubs around the same time. When this happens, the lionesses help raise each other's cubs. The lionesses work together to feed and protect all the cubs for about two years.
Lionesses have to protect their cubs from male lions that are not part of their pride. These male lions may attack and kill the cubs to try to take over the pride. When a pride has multiple lionesses, the cubs are less likely to be killed in an attack. When a pride has only one lioness, the cubs are more likely to be killed.
Figure: African lionesses and their cubs. | closed choice | grade8 | natural science | literacy-in-science | Adaptations and natural selection | How can animal behaviors affect reproductive success? Identify evidence to support a claim | Animals increase their reproductive success when they have offspring that survive to reproduce.
Animals can increase their chances of having offspring by behaving in ways that help them get partners to mate and reproduce with. These partners are called mates. For example, animals may make special sounds, perform specific dances, or show off bright colors to attract mates. Animals may also compete with each other for mates.
Animals can increase the chances that their offspring will survive to reproduce by caring for and protecting them. For example, animals may feed their offspring or guard them from predators. These behaviors increase the chances that the offspring will survive to adulthood, when they can reproduce.
Many behaviors can increase the chances that animals will have offspring that survive to reproduce. But the behaviors cannot guarantee that the animals will have greater reproductive success. Animals that attract or compete for mates won't always successfully mate and reproduce, and offspring that are fed and protected won't always survive to adulthood. | Look for the part of the passage that describes the effect of raising cubs with other lionesses in a pride. Use this information to determine why this behavior can increase the African lioness's reproductive success.
Choice "African lions live in groups called prides. In a pride, female lions, or lionesses, may give birth to cubs around the same time. When this happens, the lionesses help raise each other's cubs. The lionesses work together to feed and protect all the cubs for about two years." is incorrect.
Choice "Lionesses have to protect their cubs from male lions that are not part of their pride. These male lions may attack and kill the cubs to try to take over the pride. When a pride has multiple lionesses, the cubs are less likely to be killed in an attack. When a pride has only one lioness, the cubs are more likely to be killed." is incorrect.
Choice "Choice "Raising cubs with other lionesses in a pride increases the chances that the lioness's cubs will survive attacks." is incorrect." is correct.
Choice "According to the underlined text, cubs are more likely to survive attacks by male lions when a pride has multiple lionesses. So, by raising cubs with other lionesses in a pride, a lioness increases the chances that her cubs will survive. This can increase her reproductive success." is incorrect.
Choice "Choice "Raising cubs with other lionesses in a pride increases the chances that the lioness's cubs will be around other cubs." is incorrect." is incorrect.
Choice "Raising cubs with other lionesses in a pride may increase the chances that the lioness's cubs will be around other cubs. But the passage does not discuss whether this could affect the lioness's reproductive success. If more cubs are in a pride, they may compete for food. If the lioness's cubs have trouble getting food, that could decrease her reproductive success." is incorrect.
Choice "Choice "Raising cubs with other lionesses in a pride increases the chances that the lioness will feed the cubs of other lionesses." is incorrect." is incorrect.
Choice "To increase her reproductive success, the lioness needs to have offspring that survive to reproduce. Feeding the cubs of other lionesses does not directly increase the lioness's chances of producing offspring that survive to reproduce. So, feeding other cubs of other lionesses is not why raising cubs with other lionesses increases the lioness's reproductive success." is incorrect. |
|
Not supported with pagination yet | Which figure of speech is used in this text?
After basketball practice, I was so hungry that I could have eaten a horse. | [
"paradox",
"hyperbole"
] | 1 | closed choice | grade9 | language science | figurative-language | Literary devices | Classify figures of speech: euphemism, hyperbole, oxymoron, paradox | Figures of speech are words or phrases that use language in a nonliteral or unusual way. They can make writing more expressive.
A euphemism is a polite or indirect expression that is used to de-emphasize an unpleasant topic.
The head of Human Resources would never refer to firing people, only to laying them off.
Hyperbole is an obvious exaggeration that is not meant to be taken literally.
I ate so much that I think I might explode!
An oxymoron is a joining of two seemingly contradictory terms.
Some reviewers are calling this book a new classic.
A paradox is a statement that might at first appear to be contradictory, but that may in fact contain some truth.
Always expect the unexpected. | The text uses hyperbole, an obvious exaggeration that is not meant to be taken literally.
Could have eaten a horse is an exaggeration, since it is unlikely that someone could eat an entire horse. |
|
Identify the question that Erin's experiment can best answer. | [
"Do slugs eat more from tomato leaves or broccoli leaves?",
"Do slugs weigh more after eating tomato leaves or broccoli leaves?"
] | 0 | The passage below describes an experiment. Read the passage and then follow the instructions below.
Erin cut tomato and broccoli plant leaves into one-inch squares. In each of 12 containers, she placed six leaf squares: three tomato-leaf squares and three broccoli-leaf squares. She put one slug from her garden into each container. After two days, Erin measured the amount of each leaf square that had been eaten by the slugs. She compared the amount that had been eaten from the tomato-leaf squares to the amount that had been eaten from the broccoli-leaf squares.
Figure: a slug on a leaf. | closed choice | grade8 | natural science | science-and-engineering-practices | Designing experiments | Identify the experimental question | Experiments can be designed to answer specific questions. How can you identify the questions that a certain experiment can answer? In order to do this, you need to figure out what was tested and what was measured during the experiment.
Imagine an experiment with two groups of daffodil plants. One group of plants was grown in sandy soil, and the other was grown in clay soil. Then, the height of each plant was measured.
First, identify the part of the experiment that was tested. The part of an experiment that is tested usually involves the part of the experimental setup that is different or changed. In the experiment described above, each group of plants was grown in a different type of soil. So, the effect of growing plants in different soil types was tested.
Then, identify the part of the experiment that was measured. The part of the experiment that is measured may include measurements and calculations. In the experiment described above, the heights of the plants in each group were measured.
Experiments can answer questions about how the part of the experiment that is tested affects the part that is measured. So, the experiment described above can answer questions about how soil type affects plant height.
Examples of questions that this experiment can answer include:
Does soil type affect the height of daffodil plants?
Do daffodil plants in sandy soil grow taller than daffodil plants in clay soil?
Are daffodil plants grown in sandy soil shorter than daffodil plants grown in clay soil? | ||
Not supported with pagination yet | Which sentence is more formal? | [
"There are some things that Ms. Campbell wants to bring up at the next city council meeting.",
"Ms. Campbell has several important proposals to discuss at the next city council meeting."
] | 1 | closed choice | grade7 | language science | writing-strategies | Author's purpose and tone | Which sentence is more formal? | Formal writing is used for essays, business letters, and reports. The following types of informal language should be avoided in formal writing:
Type | Examples
slang | cool, awesome
idioms | knock your socks off
conversational language | gonna, kinda, yeah
abbreviated language | ASAP, FYI
overly simple or imprecise language | he got some stuff at the store
contractions | can't, won't
Contractions are not as informal as the other types, but they should be used sparingly in formal writing.
Compare the following sentences. The first is informal. The second is formal.
Informal: Yeah, ostriches can't fly, but they're awesome runners.
Formal: Though ostriches are flightless, they are remarkably adept runners.
| The second sentence is less formal. You can tell because it uses overly simple or imprecise language (some things, bring up).
The first sentence uses more precise language, so it is more formal overall. |
|
Not supported with pagination yet | Select the animal. | [
"Fig trees have many leaves.",
"Ladybugs walk and fly."
] | 1 | closed choice | grade2 | natural science | biology | Classification | Identify plants and animals | Plants and animals are living things. Living things are called organisms.
Plants come in many shapes and sizes. Most plants grow in the ground. They might grow leaves, flowers, and fruit. Plants cannot move around on their own like animals can.
Animals also come in many shapes and sizes. Most animals can move around. Animals might run, swim, jump, or fly. Animals eat plants or other organisms for food. | A fig tree is a plant. It has many leaves.
Fig trees grow in dry, sunny places.
A ladybug is an animal. It walks and flies.
Some ladybugs have spots. Other types of ladybugs have stripes! |
|
Identify the question that Brittany's experiment can best answer. | [
"Does the humidity level where tomato seeds are planted affect the number of tomato seedlings that grow?",
"Do more tomato seedlings grow when they are planted in soil with fertilizer compared to soil without fertilizer?"
] | 1 | The passage below describes an experiment. Read the passage and then follow the instructions below.
Brittany planted 25 tomato seeds one-half inch below the soil surface in each of six pots. Brittany added an equal amount of fertilizer to three of the six pots. She placed the pots in a plant growth chamber where all the seeds experienced the same temperature, amount of light, and humidity level. After two weeks, Brittany counted the number of seedlings that grew in each pot. She compared the number of seedlings in the pots with fertilizer to the number of seedlings in the pots without fertilizer.
Figure: tomato seedlings growing in soil. | closed choice | grade6 | natural science | science-and-engineering-practices | Designing experiments | Identify the experimental question | Experiments can be designed to answer specific questions. How can you identify the questions that a certain experiment can answer? In order to do this, you need to figure out what was tested and what was measured during the experiment.
Imagine an experiment with two groups of daffodil plants. One group of plants was grown in sandy soil, and the other was grown in clay soil. Then, the height of each plant was measured.
First, identify the part of the experiment that was tested. The part of an experiment that is tested usually involves the part of the experimental setup that is different or changed. In the experiment described above, each group of plants was grown in a different type of soil. So, the effect of growing plants in different soil types was tested.
Then, identify the part of the experiment that was measured. The part of the experiment that is measured may include measurements and calculations. In the experiment described above, the heights of the plants in each group were measured.
Experiments can answer questions about how the part of the experiment that is tested affects the part that is measured. So, the experiment described above can answer questions about how soil type affects plant height.
Examples of questions that this experiment can answer include:
Does soil type affect the height of daffodil plants?
Do daffodil plants in sandy soil grow taller than daffodil plants in clay soil?
Are daffodil plants grown in sandy soil shorter than daffodil plants grown in clay soil? | ||
What can Connor and Vicky trade to each get what they want? | [
"Connor can trade his tomatoes for Vicky's sandwich.",
"Vicky can trade her broccoli for Connor's oranges.",
"Vicky can trade her almonds for Connor's tomatoes.",
"Connor can trade his tomatoes for Vicky's broccoli."
] | 3 | Trade happens when people agree to exchange goods and services. People give up something to get something else. Sometimes people barter, or directly exchange one good or service for another.
Connor and Vicky open their lunch boxes in the school cafeteria. Both of them could be happier with their lunches. Connor wanted broccoli in his lunch and Vicky was hoping for tomatoes. Look at the images of their lunches. Then answer the question below. | closed choice | grade6 | social science | economics | Basic economic principles | Trade and specialization | Connor wanted broccoli in his lunch and Vicky was hoping for tomatoes. Look at the labeled part of the images.
Connor has tomatoes. Vicky has broccoli. They can trade tomatoes for broccoli to both be happier. Trading other things would not help either person get more items they want. |
||
Compare the average kinetic energies of the particles in each sample. Which sample has the higher temperature? | [
"neither; the samples have the same temperature",
"sample A",
"sample B"
] | 0 | The diagrams below show two pure samples of gas in identical closed, rigid containers. Each colored ball represents one gas particle. Both samples have the same number of particles. | closed choice | grade7 | natural science | physics | Particle motion and energy | Identify how particle motion affects temperature and pressure | The temperature of a substance depends on the average kinetic energy of the particles in the substance. The higher the average kinetic energy of the particles, the higher the temperature of the substance.
The kinetic energy of a particle is determined by its mass and speed. For a pure substance, the greater the mass of each particle in the substance and the higher the average speed of the particles, the higher their average kinetic energy. | Each particle in the two samples has the same mass, and the particles in both samples have the same average speed. So, the particles in both samples have the same average kinetic energy.
Because the particles in both samples have the same average kinetic energy, the samples must have the same temperature. |
|
Not supported with pagination yet | Which tense does the sentence use?
The president of the company announces the plan. | [
"past tense",
"present tense",
"future tense"
] | 1 | closed choice | grade3 | language science | verbs | Verb tense | Is the sentence in the past, present, or future tense? | Present tense verbs tell you about something that is happening now.
Most present-tense verbs are regular. They have no ending, or they end in -s or -es.
Two verbs are irregular in the present tense, to be and to have. You must remember their forms.
Past tense verbs tell you about something that has already happened.
Most past-tense verbs are regular. They end in -ed.
Some verbs are irregular in the past tense. You must remember their past-tense forms.
Future tense verbs tell you about something that is going to happen.
All future-tense verbs use the word will.
Present | Past | Future
walk, walks | walked | will walk
go, goes | went | will go | The sentence is in present tense. You can tell because it uses a present-tense verb, announces. The verb ends in -s and tells you about something that is true or happening now. |
|
Which three months have the same average precipitation? | [
"December, January, and February",
"September, October, and November",
"June, July, and August"
] | 1 | Use the graph to answer the question below. | closed choice | grade3 | natural science | earth-science | Weather and climate | Use climate data to make predictions | Scientists record climate data from places around the world. Precipitation, or rain and snow, is one type of climate data.
A bar graph can be used to show the average amount of precipitation each month. Months with taller bars have more precipitation on average. | To describe the average precipitation trends in Chicago, look at the graph.
Choice "Jan" is incorrect.
Choice "Feb" is incorrect.
Choice "Jun" is incorrect.
Choice "Jul" is incorrect.
Choice "Aug" is incorrect.
Choice "Sep" is incorrect.
Choice "Oct" is incorrect.
Choice "Nov" is incorrect.
Choice "Dec" is incorrect.
Choice "December, January, and February" is incorrect.
The average precipitation for these three months is different. The average precipitation in December is just over 2 inches. But, the average precipitation in January and February is just under 2 inches.
Choice "June, July, and August" is incorrect.
The average precipitation for these three months is different. The average precipitation in August is more than an inch higher than the average precipitation in June and July.
Choice "September, October, and November" is incorrect.
The average precipitation in September, October, and November is just over 3 inches. Every other month has an average precipitation that is either higher or lower than these three months. |
|
Not supported with pagination yet | Assume all other forces on the train are balanced. Which statement describes the forces on the train? | [
"The forces are unbalanced, so there is a net force on the train.",
"The forces are balanced, so there is no net force on the train."
] | 1 | A train is sitting on a magnetic track. Earth's gravity is pulling down on the train with a force of 200,000N. The magnetic track is pushing up on the train with a force of 200,000N. | closed choice | grade7 | natural science | physics | Velocity, acceleration, and forces | Balanced and unbalanced forces | A force is a push or a pull that acts on an object. Every force has a direction and a magnitude, or strength. If two forces act on an object in opposite directions, the forces are called opposing forces.
When opposing forces have the same magnitude, they are balanced. If all the forces on an object are balanced, there is no net force on the object.
When opposing forces have different magnitudes, the forces are unbalanced. If any forces on an object are unbalanced, there is a net force on the object. | To determine if there is a net force on the train, look at the forces:
Earth's gravity is pulling the train down with a force of 200,000 N.
The magnetic track is pushing the train up with a force of 200,000 N.
The forces are in opposite directions, and the forces have the same magnitude: 200,000 N. This means that the forces are balanced, so there is no net force on the train. |
Not supported with pagination yet | What is the temperature of a hot day in the desert? | [
"47°F",
"47°C"
] | 1 | Select the better estimate. | closed choice | grade7 | natural science | units-and-measurement | Units and measurement | Estimate temperatures | Measurements are written with both a number and a unit. The unit comes after the number. The unit shows what the number means.
Temperature can be written with units of degrees Fahrenheit (°F) or Celsius (°C). Use the list below to compare the two units.
212°F | Water boils | 100°C
98.6°F | Body temperature | 37°C
68°F | Room temperature | 20°C
32°F | Water freezes | 0°C
| The better estimate for the temperature of a hot day in the desert is 47°C.
47°F is too cold. |
Think about the magnetic force between the magnets in each pair. Which of the following statements is true? | [
"The magnetic force is weaker in Pair 1.",
"The magnetic force is weaker in Pair 2.",
"The strength of the magnetic force is the same in both pairs."
] | 2 | The images below show two pairs of magnets. The magnets in different pairs do not affect each other. All the magnets shown are made of the same material. | closed choice | grade3 | natural science | physics | Magnets | Compare strengths of magnetic forces | Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart.
These pulls and pushes between magnets are called magnetic forces. The stronger the magnetic force between two magnets, the more strongly the magnets attract or repel each other. | Distance affects the strength of the magnetic force. But the distance between the magnets in Pair 1 and in Pair 2 is the same.
So, the strength of the magnetic force is the same in both pairs. |
|
Not supported with pagination yet | Which soccer ball has a lower temperature? | [
"the soccer ball with more thermal energy",
"the soccer ball with less thermal energy"
] | 1 | Two soccer balls are identical except for their thermal energies. | closed choice | grade5 | natural science | physics | Heat and thermal energy | How are temperature and mass related to thermal energy? | Matter is made of tiny particles called atoms. Atoms are always moving.
The energy of moving atoms is called thermal energy. The total amount of thermal energy in matter depends on three things: the type of matter, the amount of matter, and how fast the atoms are moving.
Temperature measures how hot or cold matter is. If the atoms in matter slow down, the temperature goes down. The matter now has both less thermal energy and a lower temperature.
What happens if the amount of matter changes? A 2-kilogram brick at 70°F has twice as much thermal energy as a 1-kilogram brick at 70°F. The two bricks have the same temperature, but the larger brick has twice as many atoms. So, it has twice as much thermal energy. | The two soccer balls are made of the same material and have the same mass. So, the soccer ball with less thermal energy has a lower temperature. |
Not supported with pagination yet | Compare the motion of three motorboats. Which motorboat was moving at the highest speed? | [
"a motorboat that moved 180kilometers east in 5hours",
"a motorboat that moved 360kilometers south in 5hours",
"a motorboat that moved 90kilometers east in 5hours"
] | 1 | closed choice | grade3 | natural science | physics | Force and motion | Compare the speeds of moving objects | An object's speed tells you how fast the object is moving. Speed depends on both distance and time.
Distance tells you how far the object has moved. One unit used to measure distance is the kilometer.
Time tells you how long the object has spent moving. One unit used to measure time is the hour.
Think about objects moving for the same amount of time. The object that is moving the fastest will go the farthest distance in that time. It is moving at the highest speed. | Look at the distance each motorboat moved and the time it took to move that distance. The direction each motorboat moved does not affect its speed.
Notice that each motorboat moved for 5 hours. The motorboat that moved 360 kilometers moved the farthest distance in that time. So, that motorboat must have moved at the highest speed. |
|
Which of these oceans does the prime meridian intersect? | [
"the Arctic Ocean",
"the Pacific Ocean",
"the Indian Ocean"
] | 0 | closed choice | grade4 | social science | geography | Maps | Use lines of latitude and longitude | Lines of latitude and lines of longitude are imaginary lines drawn on some globes and maps. They can help you find places on globes and maps.
Lines of latitude show how far north or south a place is. We use units called degrees to describe how far a place is from the equator. The equator is the line located at 0° latitude. We start counting degrees from there.
Lines north of the equator are labeled N for north. Lines south of the equator are labeled S for south. Lines of latitude are also called parallels because each line is parallel to the equator.
Lines of longitude are also called meridians. They show how far east or west a place is. We use degrees to help describe how far a place is from the prime meridian. The prime meridian is the line located at 0° longitude. Lines west of the prime meridian are labeled W. Lines east of the prime meridian are labeled E. Meridians meet at the north and south poles.
The equator goes all the way around the earth, but the prime meridian is different. It only goes from the North Pole to the South Pole on one side of the earth. On the opposite side of the globe is another special meridian. It is labeled both 180°E and 180°W.
Together, lines of latitude and lines of longitude form a grid. You can use this grid to find the exact location of a place. | The prime meridian is the line at 0° longitude. It intersects the Arctic Ocean. It does not intersect the Indian Ocean or the Pacific Ocean. |
||
Not supported with pagination yet | What kind of sentence is this?
No one lives at the base of the volcano. | [
"interrogative",
"declarative"
] | 1 | closed choice | grade4 | language science | punctuation | Sentences, fragments, and run-ons | Is the sentence declarative, interrogative, imperative, or exclamatory? | There are four kinds of sentences.
A declarative sentence is a statement. It tells about something. A declarative sentence always ends with a period.
I have an older brother and a younger sister.
An interrogative sentence is a question. It asks something. An interrogative sentence always ends with a question mark.
How tall are you?
An imperative sentence is a command. It makes a request or tells someone to do something. An imperative sentence usually ends with a period. If the command shows strong feeling, it ends with an exclamation point.
Read the first chapter by next week.
Look out for that car!
An exclamatory sentence is like a statement, but it shows surprise or strong feeling. An exclamatory sentence always ends with an exclamation point.
Some whales are over ninety feet long!
I can't wait until tomorrow! | The sentence tells about something, and it ends with a period. It is a declarative sentence. |
|
Is grape juice a solid, a liquid, or a gas? | [
"a gas",
"a liquid",
"a solid"
] | 1 | closed choice | grade3 | natural science | physics | States of matter | Classify matter as solid, liquid, or gas | Solid, liquid, and gas are states of matter. Matter is anything that takes up space. Matter can come in different states, or forms.
When matter is a solid, it has a definite volume and a definite shape. So, a solid has a size and shape of its own.
Some solids can be easily folded, bent, or broken. A piece of paper is a solid. Also, some solids are very small. A grain of sand is a solid.
When matter is a liquid, it has a definite volume but not a definite shape. So, a liquid has a size of its own, but it does not have a shape of its own. Think about pouring juice from a bottle into a cup. The juice still takes up the same amount of space, but it takes the shape of the bottle.
Some liquids do not pour as easily as others. Honey and milk are both liquids. But pouring honey takes more time than pouring milk.
When matter is a gas, it does not have a definite volume or a definite shape. A gas expands, or gets bigger, until it completely fills a space. A gas can also get smaller if it is squeezed into a smaller space.
Many gases are invisible. Air is a gas. | Grape juice is a liquid. A liquid takes the shape of any container it is in.
If you pour grape juice into a different container, the grape juice will take the shape of that container. But the grape juice will still take up the same amount of space. |
||
Select the organism in the same species as the blue jay. | [
"Pelecanus occidentalis",
"Cyanocitta stelleri",
"Cyanocitta cristata"
] | 2 | This organism is a blue jay. Its scientific name is Cyanocitta cristata. | closed choice | grade6 | natural science | biology | Classification and scientific names | Use scientific names to classify organisms | Scientists use scientific names to identify organisms. Scientific names are made of two words.
The first word in an organism's scientific name tells you the organism's genus. A genus is a group of organisms that share many traits.
A genus is made up of one or more species. A species is a group of very similar organisms. The second word in an organism's scientific name tells you its species within its genus.
Together, the two parts of an organism's scientific name identify its species. For example Ursus maritimus and Ursus americanus are two species of bears. They are part of the same genus, Ursus. But they are different species within the genus. Ursus maritimus has the species name maritimus. Ursus americanus has the species name americanus.
Both bears have small round ears and sharp claws. But Ursus maritimus has white fur and Ursus americanus has black fur.
| A blue jay's scientific name is Cyanocitta cristata.
Cyanocitta cristata is in the same genus as Cyanocitta stelleri, but they are not in the same species.
Organisms in the same species have the same scientific names. Cyanocitta cristata and Cyanocitta stelleri are different species within the same genus.
Pelecanus occidentalis does not have the same scientific name as a blue jay. So, Cyanocitta cristata and Pelecanus occidentalis are not in the same species.
Cyanocitta cristata has the same scientific name as a blue jay. So, these organisms are in the same species. |
|
What is the name of the colony shown? | [
"Ohio",
"Michigan",
"West Virginia",
"New Hampshire"
] | 3 | closed choice | grade7 | social science | us-history | Colonial America | Identify the Thirteen Colonies | The colony is New Hampshire.
During the colonial era, New Hampshire and New York both claimed the territory that would later become the state of Vermont. Vermont was never its own colony. |
|||
Not supported with pagination yet | Complete the statement.
Phosphine is (). | [
"a compound",
"an elementary substance"
] | 0 | Phosphine is a poisonous gas that some farmers use to kill insects. The chemical formula for phosphine is PH3. | closed choice | grade5 | natural science | chemistry | Atoms and molecules | Classify elementary substances and compounds using chemical formulas | Every substance around you is made of one or more chemical elements, or types of atoms. Substances that are made of only one chemical element are elementary substances. Substances that are made of two or more chemical elements bonded together are compounds.
Every chemical element is represented by its own symbol. For some elements, the symbol is one capital letter. For other elements, the symbol is one capital letter and one lowercase letter. For example, the symbol for the element fluorine is F, and the symbol for the element beryllium is Be.
The symbol for each element in a substance is shown in the substance's chemical formula.
An elementary substance is represented by a chemical formula that contains only one symbol.
The symbol may be followed by a subscript. A subscript is text that is smaller and placed lower than the normal line of text. A subscript is included when the atoms in the elementary substance are bonded to form molecules. The subscript tells you the number of atoms in each molecule.
For example, the chemical formula for the elementary substance oxygen is O2. The formula has a subscript of 2. This subscript tells you that there are two atoms in the molecule represented by this chemical formula.
The chemical element represented by the symbol O is also called oxygen. So, the formula O2 tells you that each molecule of O2 contains two oxygen atoms.
A compound is represented by a chemical formula that contains multiple symbols.
For example, in the compound beryllium fluoride, there is one beryllium atom for every two fluorine atoms. This combination is shown in the compound's chemical formula, BeF2. In the formula, the symbol Be represents one beryllium atom. The symbol F followed by the subscript 2 represents two fluorine atoms. | You can tell whether phosphine is an elementary substance or a compound by counting the number of symbols in its chemical formula. A symbol contains either one capital letter or a capital letter followed by one or two lowercase letters.
The chemical formula for phosphine is PH3. This formula contains two symbols: P for phosphorus and H for hydrogen. So, the formula tells you that phosphine is made of two chemical elements bonded together.
Substances made of two or more chemical elements bonded together are compounds. So, phosphine is a compound. |
What can Mackenzie and Zane trade to each get what they want? | [
"Mackenzie can trade her tomatoes for Zane's broccoli.",
"Zane can trade his broccoli for Mackenzie's oranges.",
"Zane can trade his almonds for Mackenzie's tomatoes.",
"Mackenzie can trade her tomatoes for Zane's sandwich."
] | 0 | Trade happens when people agree to exchange goods and services. People give up something to get something else. Sometimes people barter, or directly exchange one good or service for another.
Mackenzie and Zane open their lunch boxes in the school cafeteria. Both of them could be happier with their lunches. Mackenzie wanted broccoli in her lunch and Zane was hoping for tomatoes. Look at the images of their lunches. Then answer the question below. | closed choice | grade6 | social science | economics | Basic economic principles | Trade and specialization | Mackenzie wanted broccoli in her lunch and Zane was hoping for tomatoes. Look at the labeled part of the images.
Mackenzie has tomatoes. Zane has broccoli. They can trade tomatoes for broccoli to both be happier. Trading other things would not help either person get more items they want. |
||
Not supported with pagination yet | Which letter to the editor is more formal? | [
"I'm writing because I'm fed up about our library not staying open like it used to.",
"I am writing to express my dissatisfaction with the library's reduced hours."
] | 1 | closed choice | grade11 | language science | writing-strategies | Audience, purpose, and tone | Which text is most formal? | Informal writing is typically used in casual situations or when communicating with someone you know well. Informal language often expresses familiarity and tends to sound more like speech. It uses more conversational language, such as slang, idioms, abbreviations, imprecise language, and contractions.
Formal writing is typically used in academic and business writing or when writing directly to an authority figure. It tends to be more courteous and impersonal, avoiding overly familiar or conversational language.
Compare the following sentences.
Informal: Yeah, ostriches can't fly, but I think they're awesome.
More formal: Ostriches may be flightless, but they're remarkable runners.
Most formal: Though flightless, ostriches are remarkable runners. | The second letter to the editor is more formal. It uses more elevated language (writing to express my dissatisfaction, reduced hours). The other letter to the editor uses contractions (I'm) and slang (fed up). |
|
Which of these continents does the equator intersect? | [
"Europe",
"Asia",
"North America"
] | 1 | closed choice | grade5 | social science | geography | Maps | Use lines of latitude and longitude | Lines of latitude and lines of longitude are imaginary lines drawn on some globes and maps. They can help you find places on globes and maps.
Lines of latitude show how far north or south a place is. We use units called degrees to describe how far a place is from the equator. The equator is the line located at 0° latitude. We start counting degrees from there.
Lines north of the equator are labeled N for north. Lines south of the equator are labeled S for south. Lines of latitude are also called parallels because each line is parallel to the equator.
Lines of longitude are also called meridians. They show how far east or west a place is. We use degrees to help describe how far a place is from the prime meridian. The prime meridian is the line located at 0° longitude. Lines west of the prime meridian are labeled W. Lines east of the prime meridian are labeled E. Meridians meet at the north and south poles.
The equator goes all the way around the earth, but the prime meridian is different. It only goes from the North Pole to the South Pole on one side of the earth. On the opposite side of the globe is another special meridian. It is labeled both 180°E and 180°W.
Together, lines of latitude and lines of longitude form a grid. You can use this grid to find the exact location of a place. | The equator is the line at 0° latitude. It intersects Asia. It does not intersect North America or Europe. |
||
Which of these states is farthest south? | [
"Nebraska",
"Minnesota",
"Idaho",
"New Hampshire"
] | 0 | closed choice | grade2 | social science | geography | Geography | Read a map: cardinal directions | Maps have four cardinal directions, or main directions. Those directions are north, south, east, and west.
A compass rose is a set of arrows that point to the cardinal directions. A compass rose usually shows only the first letter of each cardinal direction.
The north arrow points to the North Pole. On most maps, north is at the top of the map. | To find the answer, look at the compass rose. Look at which way the south arrow is pointing. Nebraska is farthest south. |
||
Identify the question that Patty's experiment can best answer. | [
"Do more tomato seedlings grow when they are planted in soil with fertilizer compared to soil without fertilizer?",
"Does the humidity level where tomato seeds are planted affect the number of tomato seedlings that grow?"
] | 0 | The passage below describes an experiment. Read the passage and then follow the instructions below.
Patty planted 25 tomato seeds one-half inch below the soil surface in each of six pots. Patty added an equal amount of fertilizer to three of the six pots. She placed the pots in a plant growth chamber where all the seeds experienced the same temperature, amount of light, and humidity level. After two weeks, Patty counted the number of seedlings that grew in each pot. She compared the number of seedlings in the pots with fertilizer to the number of seedlings in the pots without fertilizer.
Figure: tomato seedlings growing in soil. | closed choice | grade7 | natural science | science-and-engineering-practices | Designing experiments | Identify the experimental question | Experiments can be designed to answer specific questions. How can you identify the questions that a certain experiment can answer? In order to do this, you need to figure out what was tested and what was measured during the experiment.
Imagine an experiment with two groups of daffodil plants. One group of plants was grown in sandy soil, and the other was grown in clay soil. Then, the height of each plant was measured.
First, identify the part of the experiment that was tested. The part of an experiment that is tested usually involves the part of the experimental setup that is different or changed. In the experiment described above, each group of plants was grown in a different type of soil. So, the effect of growing plants in different soil types was tested.
Then, identify the part of the experiment that was measured. The part of the experiment that is measured may include measurements and calculations. In the experiment described above, the heights of the plants in each group were measured.
Experiments can answer questions about how the part of the experiment that is tested affects the part that is measured. So, the experiment described above can answer questions about how soil type affects plant height.
Examples of questions that this experiment can answer include:
Does soil type affect the height of daffodil plants?
Do daffodil plants in sandy soil grow taller than daffodil plants in clay soil?
Are daffodil plants grown in sandy soil shorter than daffodil plants grown in clay soil? | ||
Not supported with pagination yet | Which figure of speech is used in this text?
It's an open secret that Ryan is writing a book based on his experiences living in Singapore. He never talks about it, but almost all his friends know. | [
"oxymoron",
"euphemism"
] | 0 | closed choice | grade12 | language science | figurative-language | Literary devices | Classify the figure of speech: euphemism, hyperbole, oxymoron, paradox | Figures of speech are words or phrases that use language in a nonliteral or unusual way. They can make writing more expressive.
A euphemism is a polite or indirect expression that is used to de-emphasize an unpleasant topic.
The head of Human Resources would never refer to firing people, only to laying them off.
Hyperbole is an obvious exaggeration that is not meant to be taken literally.
I ate so much that I think I might explode!
An oxymoron is a joining of two seemingly contradictory terms.
Some reviewers are calling this book a new classic.
A paradox is a statement that might at first appear to be contradictory, but that may in fact contain some truth.
Always expect the unexpected. | The text uses an oxymoron, a joining of two seemingly contradictory terms.
Open secret is a contradiction, because open describes something that is freely or publicly known, and a secret is hidden. |
|
Not supported with pagination yet | Which closing is correct for a letter? | [
"Thanks,\nDana",
"thanks,\nDana"
] | 0 | closed choice | grade2 | language science | capitalization | Capitalization | Greetings and closings of letters | A letter starts with a greeting and ends with a closing. For each one, capitalize the first word and end with a comma. You should also capitalize proper nouns, such as Aunt Sue.
Dear Aunt Sue,
I'm glad you could come to my party, and
thank you for the birthday gift. I could not have
asked for a better one! Every time I see it, I think
of you.
With love,
Rory | The second closing is correct:
Its first word is capitalized, and it ends with a comma. |
|
Compare the average kinetic energies of the particles in each sample. Which sample has the higher temperature? | [
"neither; the samples have the same temperature",
"sample A",
"sample B"
] | 1 | The diagrams below show two pure samples of gas in identical closed, rigid containers. Each colored ball represents one gas particle. Both samples have the same number of particles. | closed choice | grade8 | natural science | physics | Particle motion and energy | Identify how particle motion affects temperature and pressure | The temperature of a substance depends on the average kinetic energy of the particles in the substance. The higher the average kinetic energy of the particles, the higher the temperature of the substance.
The kinetic energy of a particle is determined by its mass and speed. For a pure substance, the greater the mass of each particle in the substance and the higher the average speed of the particles, the higher their average kinetic energy. | Each particle in sample A has more mass than each particle in sample B. The particles in sample A also have a higher average speed than the particles in sample B. So, the particles in sample A have a higher average kinetic energy than the particles in sample B.
Because the particles in sample A have the higher average kinetic energy, sample A must have the higher temperature. |
|
Not supported with pagination yet | Select the phase of the Moon shown in the model. | [
"new",
"full"
] | 1 | The model below shows the Moon at one position in its orbit around Earth. The white half of the Moon shows the part that is lit up by the Sun. | closed choice | grade5 | natural science | earth-science | Astronomy | Identify phases of the Moon | Although the Moon appears to shine, it does not give off light. Instead, we can see the Moon because it is lit up by the Sun. The part of the Moon that is both lit up by the Sun and facing Earth is called the Moon's phase.
The Moon orbits, or goes around, Earth. As it does, the Moon's phase changes. The model below shows the Moon's phase at eight positions in its orbit. The smaller moons closer to Earth show where sunlight hits the Moon. The larger moons farther from Earth show how the Moon will look during that phase.
To use the model, first pick one of the eight positions. Then, imagine standing on Earth and looking up at the Moon. Use the dotted white lines in the model to guide you. The picture of the Moon shows its phase for that position. If you are in the Southern Hemisphere, the Moon will appear flipped, left to right. | |
Is rubber a mineral? | [
"yes",
"no"
] | 1 | Rubber has the following properties:
human-made
not a pure substance
solid
no fixed crystal structure | yes or no | grade5 | natural science | earth-science | Rocks and minerals | Identify rocks and minerals | Properties are used to identify different substances. Minerals have the following properties:
It is a solid.
It is formed in nature.
It is not made by organisms.
It is a pure substance.
It has a fixed crystal structure.
If a substance has all five of these properties, then it is a mineral.
Look closely at the last three properties:
A mineral is not made by organisms.
Organisms make their own body parts. For example, snails and clams make their shells. Because they are made by organisms, body parts cannot be minerals.
Humans are organisms too. So, substances that humans make by hand or in factories cannot be minerals.
A mineral is a pure substance.
A pure substance is made of only one type of matter. All minerals are pure substances.
A mineral has a fixed crystal structure.
The crystal structure of a substance tells you how the atoms or molecules in the substance are arranged. Different types of minerals have different crystal structures, but all minerals have a fixed crystal structure. This means that the atoms or molecules in different pieces of the same type of mineral are always arranged the same way.
| Rubber does not have all the properties of a mineral. So, rubber is not a mineral. |
|
Does this passage describe the weather or the climate? | [
"climate",
"weather"
] | 0 | Figure: Taj Mahal.
The Taj Mahal receives over two million visitors each year. It is located in northern India, where monsoon rains fall each year between June and September.
Hint: Weather is what the atmosphere is like at a certain place and time. Climate is the pattern of weather in a certain place. | closed choice | grade6 | natural science | earth-science | Weather and climate | Weather and climate around the world | The atmosphere is the layer of air that surrounds Earth. Both weather and climate tell you about the atmosphere.
Weather is what the atmosphere is like at a certain place and time. Weather can change quickly. For example, the temperature outside your house might get higher throughout the day.
Climate is the pattern of weather in a certain place. For example, summer temperatures in New York are usually higher than winter temperatures. | Read the passage carefully.
The Taj Mahal receives over two million visitors each year. It is located in northern India, where monsoon rains fall each year between June and September.
The underlined part of the passage tells you about the usual pattern of precipitation at the Taj Mahal. This passage does not describe what the weather is like on a particular day. So, this passage describes the climate. |
|
What is the capital of Delaware? | [
"Dover",
"Birmingham",
"Augusta",
"Chicago"
] | 0 | closed choice | grade3 | social science | geography | State capitals | Identify state capitals of the Northeast | Dover is the capital of Delaware. |
|||
Which month has the lowest average temperature in Amsterdam? | [
"December",
"January",
"February"
] | 2 | Use the graph to answer the question below. | closed choice | grade4 | natural science | earth-science | Weather and climate | Use climate data to make predictions | To describe the average temperature trends in Amsterdam, look at the graph.
Choice "Feb" is incorrect.
Choice "Dec" is incorrect.
Choice "Jan" is incorrect.
The average temperature in February is around 2°C. This is the lowest average temperature of all of the months. |
||
Not supported with pagination yet | Last year, there were seven men's clothing stores on Main Street in Ashland. This year, there are only three. What probably happened to the overall supply of men's shirts in Ashland? | [
"The supply probably went up.",
"The supply probably went down."
] | 1 | closed choice | grade7 | social science | economics | Supply and demand | Understand overall supply and demand | Overall supply is the total amount of a good or service that producers make and sell. There are several things that can make overall supply go up or down. The table below shows how changes to these things might affect overall supply.
| Resources | Number of producers or suppliers | Expected change in demand
Supply goes up | when resources cost less or are easier to get | when there are more producers or suppliers | when demand is expected to go up
Supply goes down | when resources cost more or are harder to get | when there are fewer producers or suppliers | when demand is expected to go down
Producers are people or companies that make goods or provide services. Suppliers are people or companies that sell goods or services. New inventions or technologies can also help workers produce goods and services more quickly. As a result of these changes, the supply of a good or service will often go up. | When four men's clothing stores closed on Main Street, the number of suppliers went down. There were fewer stores selling men's shirts. So, the supply of men's shirts probably went down. |
|
Which ocean is highlighted? | [
"the Arctic Ocean",
"the Southern Ocean",
"the Pacific Ocean",
"the Atlantic Ocean"
] | 3 | closed choice | grade7 | social science | geography | Physical Geography | Oceans and continents | Oceans are huge bodies of salt water. The world has five oceans. All of the oceans are connected, making one world ocean. | This is the Atlantic Ocean. |
||
Not supported with pagination yet | What information supports the conclusion that Shawn acquired this trait? | [
"Shawn's scar was caused by an accident. He cut his arm when he fell off his bicycle.",
"Some scars fade more quickly than others."
] | 0 | Read the description of a trait.
Shawn has a scar on his right arm. | closed choice | grade3 | natural science | biology | Heredity | Inherited and acquired traits: use evidence to support a statement | Organisms, including people, have both inherited and acquired traits. Inherited and acquired traits are gained in different ways.
Inherited traits are passed down through families. Children gain these traits from their parents. Inherited traits do not need to be learned.
Acquired traits are gained during a person's life. Some acquired traits, such as riding a bicycle, are gained by learning. Other acquired traits, such as scars, are caused by the environment. | |
Not supported with pagination yet | What is the source of the allusion in the sentence below?
Much to our shock, Erik chose to turn the other cheek when Cora insulted him in a meeting. | [
"a song",
"the Bible"
] | 1 | closed choice | grade7 | language science | figurative-language | Literary devices | Recall the source of an allusion | An allusion is a brief mention of something or someone well known, often from mythology, history, or literature. An allusion lets you reference ideas from an entire story in just a few words.
"I'd better get home before I turn into a pumpkin!" Lila remarked.
Here, Lila alludes to the fairy tale "Cinderella," in which Cinderella must leave the ball before the coach that brought her transforms into a pumpkin. The allusion shows that Lila must depart immediately. | The source of the allusion turn the other cheek is the Bible.
In the Bible, Jesus counsels his followers to resist retaliation. He says that if they are struck on the right cheek, they shouldn't lash out; instead, they should turn the other cheek toward their attacker.
The allusion turn the other cheek means to respond without aggression. |
|
Is potassium feldspar a mineral or a rock? | [
"mineral",
"rock"
] | 0 | Potassium feldspar has the following properties:
glassy luster
pure substance
not made by organisms
naturally occurring
fixed crystal structure
solid | closed choice | grade8 | natural science | earth-science | Rocks and minerals | Identify rocks and minerals | Minerals are the building blocks of rocks. A rock can be made of one or more minerals.
Minerals and rocks have the following properties:
Property | Mineral | Rock
It is a solid. | Yes | Yes
It is formed in nature. | Yes | Yes
It is not made by organisms. | Yes | Yes
It is a pure substance. | Yes | No
It has a fixed crystal structure. | Yes | No
You can use these properties to tell whether a substance is a mineral, a rock, or neither.
Look closely at the last three properties:
Minerals and rocks are not made by organisms.
Organisms make their own body parts. For example, snails and clams make their shells. Because they are made by organisms, body parts cannot be minerals or rocks.
Humans are organisms too. So, substances that humans make by hand or in factories are not minerals or rocks.
A mineral is a pure substance, but a rock is not.
A pure substance is made of only one type of matter. Minerals are pure substances, but rocks are not. Instead, all rocks are mixtures.
A mineral has a fixed crystal structure, but a rock does not.
The crystal structure of a substance tells you how the atoms or molecules in the substance are arranged. Different types of minerals have different crystal structures, but all minerals have a fixed crystal structure. This means that the atoms and molecules in different pieces of the same type of mineral are always arranged the same way.
However, rocks do not have a fixed crystal structure. So, the arrangement of atoms or molecules in different pieces of the same type of rock may be different! | Potassium feldspar has all the properties of a mineral. So, potassium feldspar is a mineral. |
|
Which property do these three objects have in common? | [
"yellow",
"slippery",
"fuzzy"
] | 1 | Select the best answer. | closed choice | grade3 | natural science | physics | Materials | Compare properties of objects | An object has different properties. A property of an object can tell you how it looks, feels, tastes, or smells. Properties can also tell you how an object will behave when something happens to it.
Different objects can have properties in common. You can use these properties to put objects into groups. | Look at each object.
For each object, decide if it has that property.
Yellow is a color.
This color is yellow. The jello and the yogurt are not yellow.
A fuzzy object is covered in soft hair. The jello and the icy sidewalk are not fuzzy.
A slippery object is hard to hold onto or stand on. All three objects are slippery.
The property that all three objects have in common is slippery. |
|
Which of these states is farthest west? | [
"Arkansas",
"New Mexico",
"Florida",
"Virginia"
] | 1 | closed choice | grade4 | social science | geography | Maps | Read a map: cardinal directions | Maps have four cardinal directions, or main directions. Those directions are north, south, east, and west.
A compass rose is a set of arrows that point to the cardinal directions. A compass rose usually shows only the first letter of each cardinal direction.
The north arrow points to the North Pole. On most maps, north is at the top of the map. | To find the answer, look at the compass rose. Look at which way the west arrow is pointing. New Mexico is farthest west. |
||
Not supported with pagination yet | What information supports the conclusion that Percy acquired this trait? | [
"Percy rides his bicycle to school.",
"Percy's friend showed him how to ride a bicycle.",
"Percy and his mother both ride bicycles."
] | 1 | Read the description of a trait.
Percy can ride a bicycle. | closed choice | grade7 | natural science | biology | Genes to traits | Inherited and acquired traits: use evidence to support a statement | Organisms, including people, have both inherited and acquired traits. Inherited and acquired traits are gained in different ways.
Inherited traits are passed down from biological parents to their offspring through genes. Genes are pieces of hereditary material that contain the instructions that affect inherited traits. Offspring receive their genes, and therefore gain their inherited traits, from their biological parents. Inherited traits do not need to be learned.
Acquired traits are gained during a person's life. Some acquired traits, such as riding a bicycle, are gained by learning. Other acquired traits, such as scars, are caused by the environment. Parents do not pass acquired traits down to their offspring. | |
Which property matches this object? | [
"breakable",
"soft"
] | 0 | Select the better answer. | closed choice | grade2 | natural science | physics | Materials | Identify properties of an object | An object has different properties. A property of an object can tell you how it looks, feels, tastes, or smells. | Look at the object.
Think about each property.
A soft object changes shape when you squeeze it. The ceramic plate is not soft.
A breakable object will break into pieces if you drop it. The ceramic plate is breakable. |
|
Not supported with pagination yet | Which text message is more formal? | [
"Ms. Norton is already here. She's waiting in the lobby.",
"Heads up! Norton is here. In the lobby."
] | 0 | closed choice | grade11 | language science | writing-strategies | Audience, purpose, and tone | Which text is most formal? | Informal writing is typically used in casual situations or when communicating with someone you know well. Informal language often expresses familiarity and tends to sound more like speech. It uses more conversational language, such as slang, idioms, abbreviations, imprecise language, and contractions.
Formal writing is typically used in academic and business writing or when writing directly to an authority figure. It tends to be more courteous and impersonal, avoiding overly familiar or conversational language.
Compare the following sentences.
Informal: Yeah, ostriches can't fly, but I think they're awesome.
More formal: Ostriches may be flightless, but they're remarkable runners.
Most formal: Though flightless, ostriches are remarkable runners. | The first text message is more formal. It uses complete sentences, avoids slang (heads up), and uses the person's title (Ms. Norton). The other text message includes more casual language and sentence fragments. |
|
Not supported with pagination yet | What do these two changes have in common?
boiling an egg
acid rain weathering a marble statue | [
"Both are only physical changes.",
"Both are caused by heating.",
"Both are chemical changes.",
"Both are caused by cooling."
] | 2 | closed choice | grade7 | natural science | chemistry | Chemical reactions | Compare physical and chemical changes | Matter is made of very small particles called atoms. Atoms can be linked together by chemical bonds. When two or more atoms link together, they form a molecule.
In a chemical change, the chemical bonds in the molecules break. The atoms then link together to form different molecules. The types of molecules in matter before and after a chemical change are always different.
Some chemical changes are caused by heating or cooling. For example, burning a piece of paper is a chemical change caused by heating. As paper burns, paper molecules react with oxygen molecules in the air. This reaction breaks the chemical bonds in the molecules. The atoms then link together in a different way to form different molecules. For example, carbon dioxide molecules are formed when paper burns.
In a physical change, chemical bonds do not break. The types of molecules in matter before and after a physical change are always the same.
A change of state is a type of physical change. Changes of state can be caused by heating or cooling. For example, water vaporizing is a physical change that can be caused by heating. Liquid water and water vapor are made of the same type of matter: water.
The law of conservation of mass says that all physical and chemical changes conserve mass. Conserve means to keep the same. So, the total mass before a physical or chemical change is equal to the total mass after the change. | Step 1: Think about each change.
Boiling an egg is a chemical change. The heat causes the matter in the egg to change. Cooked eggs and raw eggs are made of different types of matter.
Acid rain weathering a marble statue is a chemical change. The acid rain reacts with the outside of the statue and breaks it down into a different type of matter. This new matter is then washed away by the rain. Acid rain is a type of pollution. It forms when smoke from automobiles and factories mixes with water in clouds.
Acid rain is a type of pollution. It forms when automobiles and factories release smoke containing sulfur or nitrogen. Some of these chemicals react with water in the atmosphere. The reaction forms droplets of water that can fall back to the ground as acid rain.
Step 2: Look at each answer choice.
Both are only physical changes.
Both changes are chemical changes. They are not physical changes.
Both are chemical changes.
Both changes are chemical changes. The type of matter before and after each change is different.
Both are caused by heating.
Cooking is caused by heating. But acid rain weathering a marble statue is not.
Both are caused by cooling.
Neither change is caused by cooling. |
|
Not supported with pagination yet | Which word would you find on a dictionary page with the following guide words?
shadow - sprout | [
"site",
"stump"
] | 0 | closed choice | grade4 | language science | reference-skills | Reference skills | Use guide words | Guide words appear on each page of a dictionary. They tell you the first word and last word on the page. The other words on the page come between the guide words in alphabetical order.
To put words in alphabetical order, put them in order by their first letters. If the first letters are the same, look at the second letters. If the second letters are the same, look at the third letters, and so on.
If one word is shorter, and there are no more letters to compare, then the shorter word comes first in alphabetical order. For example, be comes before bed. | Put the words in alphabetical order.
Since site is between the guide words shadow - sprout, it would be found on that page. |
|
Think about the magnetic force between the magnets in each pair. Which of the following statements is true? | [
"The magnetic force is weaker in Pair 2.",
"The magnetic force is weaker in Pair 1.",
"The strength of the magnetic force is the same in both pairs."
] | 0 | The images below show two pairs of magnets. The magnets in different pairs do not affect each other. All the magnets shown are made of the same material. | closed choice | grade3 | natural science | physics | Magnets | Compare strengths of magnetic forces | Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart.
These pulls and pushes between magnets are called magnetic forces. The stronger the magnetic force between two magnets, the more strongly the magnets attract or repel each other.
You can change the strength of a magnetic force between two magnets by changing the distance between them. The magnetic force is weaker when the magnets are farther apart. | Distance affects the strength of the magnetic force. When magnets are farther apart, the magnetic force between them is weaker.
The magnets in Pair 2 are farther apart than the magnets in Pair 1. So, the magnetic force is weaker in Pair 2 than in Pair 1. |
|
What is the capital of Tennessee? | [
"Phoenix",
"Trenton",
"Topeka",
"Nashville"
] | 3 | closed choice | grade4 | social science | geography | State capitals | Identify state capitals of the Southeast | Nashville is the capital of Tennessee. |
|||
What is the name of the colony shown? | [
"Delaware",
"New Jersey",
"South Carolina",
"North Carolina"
] | 0 | closed choice | grade8 | social science | us-history | Colonial America | Identify the Thirteen Colonies | The colony is Delaware. |
|||
Not supported with pagination yet | Which of the following contains a vague pronoun reference? | [
"\"This morning, it said that Rachel Navarro won the mayoral election in Fairfax,\" Jack remarked to his sister.",
"\"This morning, the newspaper said that Rachel Navarro won the mayoral election in Fairfax,\" Jack remarked to his sister."
] | 0 | closed choice | grade11 | language science | writing-strategies | Pronouns | Identify vague pronoun references | When writing, make sure to avoid vague pronoun references. A vague pronoun reference occurs when a pronoun could refer to more than one possible antecedent.
When Lisa and Kim finally landed, she breathed a sigh of relief.
The pronoun she could refer to either Lisa or Kim, so the meaning of the sentence is unclear.
Vague pronoun references can be corrected in one of two ways:
1. Replace the pronoun with its correct antecedent:
When Lisa and Kim finally landed, Lisa breathed a sigh of relief.
2. Rewrite the sentence:
Lisa breathed a sigh of relief when she and Kim finally landed.
A vague pronoun reference also occurs when they, them, their, theirs, it, or its is used without its antecedent.
They say that this nail polish dries in less than five minutes.
The pronoun they is used without its antecedent, so the meaning of the sentence is unclear.
This problem can be fixed by replacing the pronoun with its missing antecedent.
The advertisements say that this nail polish dries in less than five minutes. | The second answer choice contains a vague pronoun reference. The pronoun it is used without its antecedent.
The first answer choice shows a possible correction for the vague pronoun reference. It has been replaced with the newspaper.
"This morning, the newspaper said that Rachel Navarro won the mayoral election in Fairfax," Jack remarked to his sister. |
|
During this time, thermal energy was transferred from () to (). | [
"each aquarium . . . the surroundings",
"the surroundings . . . each aquarium"
] | 0 | Two identical aquariums were next to an open window. One aquarium had a plastic cover on it, and the other was uncovered. This table shows how the temperature of each aquarium changed over 1.5hours. | closed choice | grade7 | natural science | physics | Thermal energy | Compare thermal energy transfers | A change in an object's temperature indicates a change in the object's thermal energy:
An increase in temperature shows that the object's thermal energy increased. So, thermal energy was transferred into the object from its surroundings.
A decrease in temperature shows that the object's thermal energy decreased. So, thermal energy was transferred out of the object to its surroundings. | The temperature of each aquarium decreased, which means that the thermal energy of each aquarium decreased. So, thermal energy was transferred from each aquarium to the surroundings. |
|
Not supported with pagination yet | Which text uses the word literally in its traditional sense? | [
"The curry that the chef prepared was so spicy that Seth's mouth was literally on fire by the time he finished his meal.",
"The curry that the chef prepared was so spicy that Seth literally had to drink three glasses of milk to ease the pain."
] | 1 | closed choice | grade9 | language science | writing-strategies | Word usage and nuance | Explore words with new or contested usages | Words change in meaning when speakers begin using them in new ways. For example, the word peruse once only meant to examine in detail, but it's now also commonly used to mean to look through in a casual manner.
When a word changes in meaning, its correct usage is often debated. Although a newer sense of the word may be more commonly used, many people consider a word's traditional definition to be the correct usage. Being able to distinguish the different uses of a word can help you use it appropriately for different audiences.
Britney perused her notes, carefully preparing for her exam.
The traditional usage above is considered more standard.
David perused the magazine, absentmindedly flipping through the pages.
The nontraditional usage above is now commonly used, but traditional style guides generally advise against it. | The first text uses literally in its traditional sense: in a factual, non-exaggerated way.
The curry that the chef prepared was so spicy that Seth literally had to drink three glasses of milk to ease the pain.
The second text uses literally in its nontraditional sense: nearly or in effect (often exaggerated). Seth's mouth may be in pain, but it is not actually on fire.
The curry that the chef prepared was so spicy that Seth's mouth was literally on fire by the time he finished his meal.
Most style guides recommend to avoid using the nontraditional sense of the word literally because it is generally considered incorrect. |
|
Not supported with pagination yet | What information supports the conclusion that Jackie acquired this trait? | [
"Jackie can fly a plane on cloudy days and at night.",
"A pilot taught Jackie how to fly a plane.",
"Jackie is in the Air Force. She flies a plane almost every day."
] | 1 | Read the description of a trait.
Jackie knows how to fly a plane. | closed choice | grade8 | natural science | biology | Genes to traits | Inherited and acquired traits: use evidence to support a statement | Organisms, including people, have both inherited and acquired traits. Inherited and acquired traits are gained in different ways.
Inherited traits are passed down from biological parents to their offspring through genes. Genes are pieces of hereditary material that contain the instructions that affect inherited traits. Offspring receive their genes, and therefore gain their inherited traits, from their biological parents. Inherited traits do not need to be learned.
Acquired traits are gained during a person's life. Some acquired traits, such as riding a bicycle, are gained by learning. Other acquired traits, such as scars, are caused by the environment. Parents do not pass acquired traits down to their offspring. | |
Not supported with pagination yet | What does the verbal irony in this text suggest?
"Someone had better turn on the heat," Isabelle said, sweat glistening on her face. | [
"The temperature was too warm.",
"The temperature was just right."
] | 0 | closed choice | grade6 | language science | figurative-language | Literary devices | Interpret figures of speech | Figures of speech are words or phrases that use language in a nonliteral or unusual way. They can make writing more expressive.
Verbal irony involves saying one thing but implying something very different. People often use verbal irony when they are being sarcastic.
Olivia seems thrilled that her car keeps breaking down.
Each breakdown is as enjoyable as a punch to the face. | The text uses verbal irony, which involves saying one thing but implying something very different.
Someone had better turn on the heat ironically suggests that the temperature was too warm. Isabelle did not think that more heat was needed; she was already sweating. |
|
Which animal's mouth is also adapted for bottom feeding? | [
"banded butterflyfish",
"bat ray"
] | 1 | Leopard sharks eat organisms such as crabs, shrimp, and fish. They are bottom feeders. Bottom feeders find their food at the bottom of rivers, lakes, and the ocean.
The 's mouth is located on the underside of its head and points downward. Its mouth is adapted for bottom feeding.
Figure: leopard shark. | closed choice | grade3 | natural science | biology | Adaptations | Animal adaptations: beaks, mouths, and necks | An adaptation is an inherited trait that helps an organism survive or reproduce. Adaptations can include both body parts and behaviors.
The shape of an animal's mouth is one example of an adaptation. Animals' mouths can be adapted in different ways. For example, a large mouth with sharp teeth might help an animal tear through meat. A long, thin mouth might help an animal catch insects that live in holes. Animals that eat similar food often have similar mouths. | Look at the picture of the leopard shark.
The leopard shark's mouth is located on the underside of its head and points downward. Its mouth is adapted for bottom feeding. The leopard shark uses its mouth to find food hidden in the sediment of the ocean floor.
Now look at each animal. Figure out which animal has a similar adaptation.
The bat ray's mouth is located on the underside of its head. Its mouth points downward. Its mouth is adapted for bottom feeding.
The banded butterflyfish's mouth is not located on the underside of its head. Its mouth is not adapted for bottom feeding. |
|
Not supported with pagination yet | What is the volume of a paper drinking cup? | [
"175 milliliters",
"175 liters"
] | 0 | Select the better estimate. | closed choice | grade4 | natural science | units-and-measurement | Units and measurement | Choose metric units of volume | Measurements are written with both a number and a unit. The unit comes after the number. The unit shows what the number means.
Volume is a measurement of how much space something takes up.
There are many different units of volume. When you are using metric units, volume may be written in units of milliliters or liters.
There are 1,000 milliliters in 1 liter. So, 1 milliliter is much less than 1 liter.
A raindrop has a volume of about 20 milliliters, while a large soda bottle has a volume of 2 liters. The flask shown here measures volumes up to 500 milliliters. | The better estimate for the volume of a paper drinking cup is 175 milliliters.
175 liters is too much. |
During this time, thermal energy was transferred from () to (). | [
"each bottle . . . the surroundings",
"the surroundings . . . each bottle"
] | 1 | Two bottles of soda were sitting on a porch on a hot day. The two bottles were identical, except that one bottle was made of brown glass and one bottle was made of clear glass. This table shows how the temperature of each bottle changed over 25minutes. | closed choice | grade7 | natural science | physics | Thermal energy | Compare thermal energy transfers | A change in an object's temperature indicates a change in the object's thermal energy:
An increase in temperature shows that the object's thermal energy increased. So, thermal energy was transferred into the object from its surroundings.
A decrease in temperature shows that the object's thermal energy decreased. So, thermal energy was transferred out of the object to its surroundings. | The temperature of each bottle increased, which means that the thermal energy of each bottle increased. So, thermal energy was transferred from the surroundings to each bottle. |
|
In this experiment, which were part of an experimental group? | [
"the kites with tails",
"the kites without tails"
] | 0 | The passage below describes an experiment.
Cameron and his friend Elizabeth flew nylon kites on the beach. They wondered if putting a tail on a kite would affect how well the kite flew.
Cameron flew a kite that did not have a tail for five minutes. Then, he attached a four-foot-long tail and flew the kite for five more minutes. Cameron repeated this with three similar kites, alternating whether he started the kite with or without a tail. During each flight, Elizabeth counted the number of times the kite crashed to the ground.
Figure: flying a kite. | closed choice | grade7 | natural science | science-and-engineering-practices | Designing experiments | Identify control and experimental groups | Experiments have variables, or parts that change. You can design an experiment to investigate whether changing a variable between different groups has a specific outcome.
For example, imagine you want to find out whether adding fertilizer to soil affects the height of pea plants. You could investigate this question with the following experiment:
You grow one group of pea plants in soil with fertilizer and measure the height of the plants. This group shows you what happens when fertilizer is added to soil. Since fertilizer is the variable whose effect you are investigating, this group is an experimental group.
You grow another group of pea plants in soil without fertilizer and measure the height of the plants. Since this group shows you what happens when fertilizer is not added to the soil, it is a control group.
By comparing the results from the experimental group to the results from the control group, you can conclude whether adding fertilizer to the soil affects pea plant height. | In this experiment, Cameron and Elizabeth investigated whether tails affect how well kites fly. So, the kites with tails were part of an experimental group.
There were no tails on the kites without tails. So, they were not part of an experimental group. |
|
Not supported with pagination yet | Which organ receives signals from the body's senses? | [
"skeleton",
"heart",
"stomach",
"brain"
] | 3 | closed choice | grade5 | natural science | biology | Animals | Human organs and their functions | |||
Not supported with pagination yet | What is the source of the allusion in the sentence below?
Fans debated whether their team would rise from the ashes. | [
"U.S. history",
"Greek mythology"
] | 1 | closed choice | grade9 | language science | figurative-language | Literary devices | Recall the source of an allusion | An allusion is a brief mention of something or someone well known, often from mythology, history, or literature. An allusion lets you reference ideas from an entire story in just a few words.
"I'd better get home before I turn into a pumpkin!" Lila remarked.
Here, Lila alludes to the fairy tale "Cinderella," in which Cinderella must leave the ball before the coach that brought her transforms into a pumpkin. The allusion shows that Lila must depart immediately. | The source of the allusion rise from the ashes is Greek mythology.
In Greek mythology, a mythical bird called the phoenix lives for hundreds of years before bursting into flames at its death. However, it soon rises from its own ashes and is reborn.
The allusion rise from the ashes means to come back after destruction or defeat. |
|
Which is the main persuasive appeal used in this ad? | [
"pathos (emotion)",
"logos (reason)",
"ethos (character)"
] | 1 | closed choice | grade7 | language science | writing-strategies | Persuasive strategies | Identify appeals to ethos, pathos, and logos in advertisements | The purpose of an advertisement is to persuade people to do something. To accomplish this purpose, advertisements use three types of persuasive strategies, or appeals:
Appeals to ethos, or character, show that the writer or speaker is trustworthy or is an authority on a subject. An ad that appeals to ethos might do one of the following:
say that a brand has been trusted for many years
note that a brand is recommended by a respected organization or celebrity
include a quote from a "real person" who shares the audience's values
Appeals to logos, or reason, use logic and specific evidence. An ad that appeals to logos might do one of the following:
use graphs or charts to display information
mention the results of scientific studies
explain the science behind a product or service
Appeals to pathos, or emotion, use feelings rather than facts to persuade the audience. An ad that appeals to pathos might do one of the following:
trigger a fear, such as the fear of embarrassment
appeal to a desire, such as the desire to appear attractive
link the product to a positive feeling, such as adventure, love, or luxury | The ad appeals to logos, or reason. It uses a graph to display information and uses specific figures (2 x longer). |
||
What is the capital of Arkansas? | [
"Fayetteville",
"Austin",
"Little Rock",
"Baton Rouge"
] | 2 | closed choice | grade3 | social science | geography | State capitals | Identify state capitals of the Southeast | Little Rock is the capital of Arkansas. |
|||
Not supported with pagination yet | What is the source of the allusion in the sentence below?
Jaylen spoke at the city council meeting, claiming the new recycling regulations were draconian. | [
"Greek history",
"a fairy tale"
] | 0 | closed choice | grade10 | language science | figurative-language | Literary devices | Recall the source of an allusion | An allusion is a brief mention of something or someone well known, often from mythology, history, or literature. An allusion lets you reference ideas from an entire story in just a few words.
"I'd better get home before I turn into a pumpkin!" Lila remarked.
Here, Lila alludes to the fairy tale "Cinderella," in which Cinderella must leave the ball before the coach that brought her transforms into a pumpkin. The allusion shows that Lila must depart immediately. | The source of the allusion draconian is Greek history.
Draco, a government official in seventh-century Athens, Greece, wrote a code of laws that called for severe punishments for even minor offenses.
The allusion draconian means harsh. |
|
Not supported with pagination yet | Which object has the most thermal energy? | [
"a 525-gram bath towel at a temperature of 4°C",
"a 525-gram bath towel at a temperature of 14°C",
"a 525-gram bath towel at a temperature of 9°C"
] | 1 | The objects are identical except for their temperatures. | closed choice | grade4 | natural science | physics | Heat and thermal energy | How is temperature related to thermal energy? | All solids, liquids, and gases are made of matter. Matter is made up of tiny particles that are always moving. The energy from the motion of these particles is called thermal energy.
Temperature measures how hot or cold matter is. If the particles in matter move faster, the temperature goes up. The matter now has both more thermal energy and a higher temperature. | All three bath towels have the same mass but different temperatures. Since the 14°C towel is the hottest, it has the most thermal energy. |
Select the organism in the same species as the common sheep. | [
"Castor fiber",
"Ovis aries",
"Alouatta caraya"
] | 1 | This organism is a common sheep. Its scientific name is Ovis aries. | closed choice | grade4 | natural science | biology | Scientific names | Use scientific names to classify organisms | Scientists use scientific names to identify organisms. Scientific names are made of two words.
The first word in an organism's scientific name tells you the organism's genus. A genus is a group of organisms that share many traits.
A genus is made up of one or more species. A species is a group of very similar organisms. The second word in an organism's scientific name tells you its species within its genus.
Together, the two parts of an organism's scientific name identify its species. For example Ursus maritimus and Ursus americanus are two species of bears. They are part of the same genus, Ursus. But they are different species within the genus. Ursus maritimus has the species name maritimus. Ursus americanus has the species name americanus.
Both bears have small round ears and sharp claws. But Ursus maritimus has white fur and Ursus americanus has black fur.
| A common sheep's scientific name is Ovis aries.
Alouatta caraya does not have the same scientific name as a common sheep. So, Ovis aries and Alouatta caraya are not in the same species.
Ovis aries has the same scientific name as a common sheep. So, these organisms are in the same species.
Castor fiber does not have the same scientific name as a common sheep. So, Ovis aries and Castor fiber are not in the same species. |
|
Which continent is highlighted? | [
"Antarctica",
"Asia",
"Australia",
"Europe"
] | 2 | closed choice | grade8 | social science | geography | Physical Geography | Oceans and continents | A continent is one of the major land masses on the earth. Most people say there are seven continents. | This continent is Australia. |
||
Not supported with pagination yet | Which word would you find on a dictionary page with the following guide words?
weary - worm | [
"wail",
"why"
] | 1 | closed choice | grade6 | language science | reference-skills | Reference skills | Use guide words | Guide words appear on each page of a dictionary. They tell you the first word and last word on the page. The other words on the page come between the guide words in alphabetical order.
To put words in alphabetical order, put them in order by their first letters. If the first letters are the same, look at the second letters. If the second letters are the same, look at the third letters, and so on.
If one word is shorter, and there are no more letters to compare, then the shorter word comes first in alphabetical order. For example, be comes before bed. | Put the words in alphabetical order.
Since why is between the guide words weary - worm, it would be found on that page. |
|
Not supported with pagination yet | Which text uses the word can in its traditional sense? | [
"Janice can type using a keyboard with a QWERTY layout, but she prefers the Dvorak layout. The two keyboards have different arrangements of letters and symbols.",
"If Janice prefers a keyboard with the Dvorak layout, she can use mine. In my opinion, it's faster than typing on a keyboard with a QWERTY layout."
] | 0 | closed choice | grade11 | language science | writing-strategies | Word usage and nuance | Explore words with new or contested usages | Words change in meaning when speakers begin using them in new ways. For example, the word peruse once only meant to examine in detail, but it's now also commonly used to mean to look through in a casual manner.
When a word changes in meaning, its correct usage is often debated. Although a newer sense of the word may be more commonly used, many people consider a word's traditional definition to be the correct usage. Being able to distinguish the different uses of a word can help you use it appropriately for different audiences.
Britney perused her notes, carefully preparing for her exam.
The traditional usage above is considered more standard.
David perused the magazine, absentmindedly flipping through the pages.
The nontraditional usage above is now commonly used, but traditional style guides generally advise against it. | The first text uses can in its traditional sense: to have the ability to.
Janice can type using a keyboard with a QWERTY layout, but she prefers the Dvorak layout. The two keyboards have different arrangements of letters and symbols.
The second text uses can in its nontraditional sense: to have permission to.
If Janice prefers a keyboard with the Dvorak layout, she can use mine. In my opinion, it's faster than typing on a keyboard with a QWERTY layout.
Most style guides recommend to use the traditional sense of the word can because it is considered more standard. |
|
Not supported with pagination yet | Which figure of speech is used in this text?
When Donald finally agreed to let his daughter adopt the stray dog, she responded with a smile that was a mile wide. | [
"paradox",
"hyperbole"
] | 1 | closed choice | grade11 | language science | figurative-language | Literary devices | Classify the figure of speech: euphemism, hyperbole, oxymoron, paradox | Figures of speech are words or phrases that use language in a nonliteral or unusual way. They can make writing more expressive.
A euphemism is a polite or indirect expression that is used to de-emphasize an unpleasant topic.
The head of Human Resources would never refer to firing people, only to laying them off.
Hyperbole is an obvious exaggeration that is not meant to be taken literally.
I ate so much that I think I might explode!
An oxymoron is a joining of two seemingly contradictory terms.
Some reviewers are calling this book a new classic.
A paradox is a statement that might at first appear to be contradictory, but that may in fact contain some truth.
Always expect the unexpected. | The text uses hyperbole, an obvious exaggeration that is not meant to be taken literally.
A smile that was a mile wide is an exaggeration, since it is physically impossible to have a smile that is actually a mile wide. |
|
Is chalcopyrite a mineral? | [
"no",
"yes"
] | 1 | Chalcopyrite has the following properties:
not made by living things
solid
found in nature
pure substance
fixed crystal structure | yes or no | grade6 | natural science | earth-science | Rocks and minerals | Identify rocks and minerals | Properties are used to identify different substances. Minerals have the following properties:
It is a solid.
It is formed in nature.
It is not made by organisms.
It is a pure substance.
It has a fixed crystal structure.
If a substance has all five of these properties, then it is a mineral.
Look closely at the last three properties:
A mineral is not made by organisms.
Organisms make their own body parts. For example, snails and clams make their shells. Because they are made by organisms, body parts cannot be minerals.
Humans are organisms too. So, substances that humans make by hand or in factories cannot be minerals.
A mineral is a pure substance.
A pure substance is made of only one type of matter. All minerals are pure substances.
A mineral has a fixed crystal structure.
The crystal structure of a substance tells you how the atoms or molecules in the substance are arranged. Different types of minerals have different crystal structures, but all minerals have a fixed crystal structure. This means that the atoms or molecules in different pieces of the same type of mineral are always arranged the same way.
| Chalcopyrite has all the properties of a mineral. So, chalcopyrite is a mineral. |
|
Will these magnets attract or repel each other? | [
"repel",
"attract"
] | 1 | Two magnets are placed as shown. | closed choice | grade4 | natural science | physics | Magnets | Identify magnets that attract or repel | Magnets can pull or push on each other without touching. When magnets attract, they pull together. When magnets repel, they push apart.
Whether a magnet attracts or repels other magnets depends on the positions of its poles, or ends. Every magnet has two poles: north and south.
Here are some examples of magnets. The north pole of each magnet is labeled N, and the south pole is labeled S.
If opposite poles are closest to each other, the magnets attract. The magnets in the pair below attract.
If the same, or like, poles are closest to each other, the magnets repel. The magnets in both pairs below repel.
| To predict if these magnets will attract or repel, look at which poles are closest to each other.
The north pole of one magnet is closest to the south pole of the other magnet. Opposite poles attract. So, these magnets will attract each other. |
|
Select the mammal below. | [
"green tree frog",
"cassowary",
"Canadian lynx",
"barn owl"
] | 2 | Mammals have hair or fur and feed their young milk.
Mammals are warm-blooded. Warm-blooded animals can control their body temperature.
A giraffe is an example of a mammal. | closed choice | grade4 | natural science | biology | Classification | Identify mammals, birds, fish, reptiles, and amphibians | Birds, mammals, fish, reptiles, and amphibians are groups of animals. Scientists sort animals into each group based on traits they have in common. This process is called classification.
Classification helps scientists learn about how animals live. Classification also helps scientists compare similar animals. | A barn owl is a bird. It has feathers, two wings, and a beak.
Barn owls live on every continent except Antarctica.
A cassowary is a bird. It has feathers, two wings, and a beak.
Cassowaries have wings, but they cannot fly! They can run very fast.
A Canadian lynx is a mammal. It has fur and feeds its young milk.
Canadian lynx have padded feet to help them walk on snow.
A green tree frog is an amphibian. It has moist skin and begins its life in water.
There are many kinds of tree frogs. Most tree frogs are very small. They can walk on thin branches. |
|
What is the name of the colony shown? | [
"Pennsylvania",
"New Jersey",
"New York",
"New Hampshire"
] | 0 | closed choice | grade4 | social science | us-history | English colonies in North America | Identify the Thirteen Colonies | The colony is Pennsylvania. |