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21. |
The cause of water pollution? |
A. |
Smoke |
B. |
2, 4-D and pesticides |
C. |
Automobile exhaust |
D. |
Aeroplanes |
Answer: Option B
Explanation:
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22. |
Which of the following, when inhaled dissolves in the blood haemoglobin rapidly then O2? |
Answer: Option B
Explanation:
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23. |
CO is harmful to human being because: |
A. |
It decreases CO2 concentration |
B. |
It competes O2 to combine with haemoglobin |
C. |
It is carcinogenic |
D. |
It depletes O3 layer |
Answer: Option B
Explanation:
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24. |
Acid rain is mainly caused by increased concentration (in atmosphere) of: |
A. |
Ozone and dust |
B. |
NH3 and SO3 |
C. |
CO and SO3 |
D. |
NO2 and SO2 |
Answer: Option D
Explanation:
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25. |
Ozone layer in stratosphere is effected by: |
A. |
Excess CO2 |
B. |
Excess CO |
C. |
Chloro-fluoro-carbon |
D. |
Low rainfall |
Answer: Option C
Explanation:
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26. |
Which one of the following insecticides is the most persistent in soil? |
A. |
Malathion |
B. |
Aldrin |
C. |
Gamma BHC |
D. |
None of these |
Answer: Option B
Explanation:
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27. |
Gases commonly referred to as 'green house gases' are: |
A. |
CH4, N2, CO2 and NH3 |
B. |
CO2, O2, NO2 and NH3 |
C. |
Chloro-fluoro-carbons, CO2, NH3 and N2 |
D. |
CO2, chloro-fluoro-carbons, CH4 and NO2 |
Answer: Option D
Explanation:
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28. |
Which of the following is not an important atmospheric pollutant? |
Answer: Option C
Explanation:
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29. |
Today, concentration of green house gases is high because of: |
A. |
Use of refrigerator |
B. |
Increased combustion of oil and coal |
C. |
Deforestation |
D. |
All the above |
Answer: Option D
Explanation:
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30. |
The presence of O3 in atmosphere of earth: |
A. |
Has been responsible for increasing the average global temperature in recent |
B. |
Is advantageous since it supplies O2 for people travelling in jets |
C. |
Hinders higher rate of photosynthesis |
D. |
Helps in checking the penetration of ultra violet rays to earth |
Answer: Option D
Explanation:
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