CLASS TEST, Pollution of Air and Water, CLASS 8

MULTIPLE CHOICE QUESTIONS (1 MARK EACH) 

1. Air is a mixture of various gases. One of the gases is 21% part of the air and is essential for the survival of human beings. This gas is 

(a) nitrogen (c) ozone (b) oxygen (d) argon 

2. Which of the following is not a source of air pollution? 

(a) automobile exhaust (c) windmill (b) burning of firewood (d) power plant 

3. Boojho wishes to contribute in reducing air pollution. Which vehicle should he use for going to school? 

(a) car (c) autorickshaw (b) school bus (d) scooter

4. Which of the following is not a way to conserve water? 

(a) replace (c) reuse (b) reduce (d) recycle 

5. The type of pollution which is likely to affect Taj Mahal in Agra to a greater extent is

 (a) air pollution (c) soil pollution (b) water pollution (d) noise pollution 

6. Incomplete combustion of fuel such as petrol and diesel gives

 (a) nitrogen oxide (c) carbon monoxide (b) sulphur dioxide (d) carbon dioxide 

7. The phenomenon of marble cancer is due to 

(a) soot particles (c) fog (b) CFCs (d) acid rain

 8. Potable water is the water which is

(a) obtained from a river. (c) pure and fit for drinking. (b) obtained from a lake. (d) used only for washing clothes. 

9. Which of the following procedures will give you water free from all impurities? 

(a) adding chlorine tablets (c) boiling (b) distillation (d) filtration 

10. A pond contains clean water. Which of the following activities will produce least pollution of water? 

(a) washing clothes in the pond (b) animals bathing in the pond (c) washing motor vehicles in the pond (d) swimming in the pond. 

11. Trees help in reducing the pollution of our environment. Lakhs of trees are planted by people in the month of July every year. The occasion is called

 (a) forest Conservation Day (c) Van Mahotsav (b) plantation month (d) wildlife week 

12. Which of the following is not a green house gas? 

(a) nitrogen gas (c) methane gas (b) water vapour (d) carbon dioxide 

VERY SHORT ANSWER QUESTIONS (2 MARKS EACH)

13. Name the chemicals which are used in refrigerators and air conditioners and damage ozone layer when released in air. 

14. Name any two sources which cause air pollution due to suspended particulate matter. 

15. Name two gases which are mainly responsible for acid rain? 

16. The quality of air at various locations is monitored regularly by government and other agencies? In what way can you use these data? 

17. Combustion of fossil fuels generates a lot of air pollution. Can you suggest any two alternative sources of energy which do not cause any pollution? 

18. Name any two water pollutants which are toxic for plants and animals