(a) aerosols (b) sewage
(c) DDT (d) fertilizers
2. Which of the following does not cause soil erosion?
(a) wind (b) overgrazing
(c) sun (d) water
3. Acid rain is due to:
(a) combustion of fossil fuels (b) oil slick
(c) oxides of sulphur (d) nuclear wars
4. Among the most harmful non-biodegradable waste is:
(a) cow dung (b) plastics
(c) garbage (d) radioactive waste
5. An example of a renewable resource is:
(a) clay t (b) sand
(c) water (d) fossil fuels
6. Which one of the following is a non-biodegradable waste?
(a) manure ‘ (b) cow durig
(c) plastics (d) garbage
7. The main source of water is:
(a) rivers (b) rain
(c) ponds (d) canals
8. Pollution is not caused by the use of:
(a) solar energy (b) wood
(c) petrol (d) unsaturated hydrocarbons
9. Ozone layer in the upper atmosphere is destroyed by: (a) HC1 (b) smog (c) chlorofluorocarbons (d) SO,
10. The gas associated with global warming is:
(a) C02 (b) H2S
(c) CH4 (d) S02
11. In water pollution, industries are said to be the:
(a) line sources (b) point sources
(c) area sources (d) none of these
12. Which of these is a non-renewable resource?
(a) coal (c) water
(b) forest (d) turtle
13. Which of these is biodegradable?
(a) cow dung (c) coke cans
(b) polythene (d) DDT
Answers:
1. (a); 2. (c); 3. (c); 4. (d); 5. (c); 6. (c); 7. (b); 8. (a); 9. (c); 10. (a); 11. (a); 12. (a); 13. (a).
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