The property by virtue of which liquid opposes relative motion between its different layers is called
None of the above/More than one of the above.
Option 3 : Viscosity
The correct answer is Viscosity.
Viscous force (F):
When a layer of fluid slips or tends to slip on adjacent layers in contact, the two layers exert tangential force on each other which tries to destroy the relative motion between them.
The property of a fluid due to which it opposes the relative motion between its different layers is called viscosity (or fluid friction or internal friction) and the force between the layers opposing the relative motion is called viscous force.
The force acting between the different layers of a fluid is given by –
\(F = - \eta A\frac{{dv}}{{dx}}\)
Where η = coefficient of viscosity, A = area of the plane and dv/dx = velocity gradient.
A negative sign is employed because viscous force acts in a direction opposite to the flow of liquid.
The SI unit of viscosity is poiseiulle (Pl). Its other units are Nsm-2 or Pa s.
Cause of Viscosity: It is due to cohesion and molecular momentum exchange between fluid layers.
C.G.S Unit of viscosity is Poise = dyne-sec/cm2
One Poise = 0.1 Pa.s
1/100 Poise is called centipoises.
Stay updated with the Physics questions & answers with Testbook. Know more about Fluids and ace the concept of Viscosity.
More Viscosity Questions
Q1. Find the dimension of 'η' in the Stoke's Law formula ?
Q2. A raindrop with a radius of 1.5 mm falls from a cloud that is at a height of 1200 m above the ground. The drag coefficient (C) for the drop is 0.60. Assume that the drop is spherical throughout its fall. The density of water is 1000 kgm-3 and the density of air is 1.2 kgm-3. Then the terminal speed of the drop is (g = 9.8 ms-2)
Q3. A liquid kept in a bucket is stirred for few seconds and then kept at rest. The liquid comes in rest after some time due to-
Q4. Angle between the viscous force and the direction of flow of the liquid is:
Q5. In case of a non-Newtonian fluid
Q6. Two spherical balls of same material of masses m and 8 m respectively, falls in same fluid. If terminal velocity of first ball is v, then terminal velocity of second ball will be
Q7. Which of the following symbols is used to represent viscosity?
Q8. Which of the following is not true about Viscosity? (a) It is the property of the liquid by virtue of which it opposes the relative motion between its adjacent layers. (b) Viscosity is not a property of gases. (c) The viscosity of a liquid decreases with increase in pressure. (d) The viscosity of an ideal fluid is zero.
Q9. The shear stress-strain graph for a Newtonian fluid is a
More Fluids Questions
Q2. Which of the following instruments is based on Archimedes principle?
Q3. When the temperature increases, the surface tension of a material _____?
Q4. In a Barometer ____ is used.
Q5. A fluid is flowing through a horizontal pipe. When pipe is constricted then-
Q6. The following weight of an object in different liquids is - 6 N in Liquid X 7 N in Liquid Y 6 N in water 9 N in Liquid Z Which liquid has the highest density?
Q7. A solid of density 2500 kg/m3 is found to weigh 0.45 kgf in air. If 3/4 volume of solid is completely immersed in brine solution of density 1150 kg/m3. Find the apparent weight of solid in brine. (g = 10m/s2)
Q8. A piece of copper of density 8.8 g/cm3 having an internal cavity weight 264 g in air and 221 g in water. the volume of cavity is:
Q9. Which property of an object determines whether the object will float or sink in the liquid?
Q10. Which one of the following regarding density of water at atmospheric pressure is correct?
APPSC Group 2 Mock Test 2021
APPSC AE Civil Mock Test 2021
APPSC Assistant Executive Engineer
SSC Scientific Assistant
APPSC Assistant Executive Engineer Important Links
Eligibility CriteriaSelection ProcessHall TicketSyllabus and Exam PatternAnswer KeyCut OffBooksPrevious Year PapersResult
More Physics Questions
Q1. X-rays were discovered by:
Q2. _______ specifies the preferred orientation in the orbital space of the given energy and size.
Q3. When a body is immersed in a liquid the upward force experienced by it is known as :
Q4. Which among the following is a non-conservative force?
Q5. The work done to move a unit charge from a point to another is called :
Q6. On which of the following scientific principles is an electric generator based?
Q7. Which among the following is used in making windows for the X-ray tubes?
Q8. How many electrons taken together make one coulomb?
Q9. An electron possesses a negative charge of:
Q10. The term radioactivity was coined by: