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.
To pass the combined CD theory test, you have 140 minutes to correctly answer 104 out of 140 questions. To pass a TMT or a BMT module theory test you have 45 minutes to answer 30 out of 40 questions correctly.f you pass a category C or D theory test on or after 30 September 2014, there is an option to sit a TMT or BMT module test to obtain the other category (D or C as appropriate) provided this is done within 2 years of the first test.