Clorox bleach can be safely used to purify water in the event of an emergency. Clorox recommends adding 2 drops of bleach to 1 quart of water or 8 drops of bleach to 1 gallon of water. Clorox warns that only regular bleach is suitable for purifying water; scented bleaches are not safe for water purification.
The pass mark for the Theory Test is 86%, so you'll need to answer 43/50 multiple choice questions correctly to pass. And for the hazard perception section of the test, you need to score 44/75. You must score a pass in both sections of the theory test to pass the overall test. What is the current pass rate for the theory test? The 2015/16 pass rate for the theory test is 49.3%*, which means just over half of all people who sit their Theory Test fail it.
Each test section is timed (between 15 and 25 minutes each), and contains between 10 and 25 questions. The tests will be graded based on how many questions are answered correctly and the minimum passing score is 70% on each section. For example, on the math portion of the exam, there are 20 questions. In order to score 70% on the math portion, at least 14 questions must be answered correctly. Therefore, given the limited time in which to answer questions, examinees should focus their time and attention on the questions that they find easier.