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Class 8 Science Chapter 18 Pollution Of Air And Water Quiz 3 (25 MCQs)

Quiz Instructions

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1. Incomplete combustion of fuelsuch as petrol and diesel gives
2. Which of the following is a reason a surgical mask is not effective in reducing the intake of particulate matter?
3. ..... is produced from incomplete burning of fuels such as petrol and diesel.
4. What percentage of the atmosphere is oxygen?
5. The substances which contaminate the ..... are called air pollutants.
6. Name the oxide that smoke contains and combines with fog and other air pollutants to create smog.
7. Water that is fit for drinking is appropriately called ..... water
8. Why do we need fresh air?
9. Water is pure and fit for drinking when it is .....
10. A chemical method for purifying water is called
11. Clear and Transparent water is always fit for drinking.
12. Formula of Carboxyhaemoglobin?
13. Ultra violets radiations are absorbed by ozone.
14. Jaya cuts down trees to make billions of toothpicks. Jaya doesn't use toothpicks, she flosses. What is she destroying?
15. Discharge of treated industrial sewage into water bodies causes water pollution
16. WHICH GAS EXIST 21% IN ATMOSPHERE
17. Burning leaves is a good method to dispose off unwanted dry leaves.
18. Name the chemicals which are used in refrigerators, air conditioners, and damage the ozone layer when released into the air.
19. Air pollution can result from .....
20. Smog is made up of ..... and .....
21. Measurements of carbon dioxide concentrations in the air taken over the past decade have shown a .....
22. Marble cancer is caused by
23. The wearing away of the earth's surface by water, wind or ice
24. One metric tonne is how many Kilograms?
25. Under what conditions are large numbers of fish in a lake most likely to die?
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