A catalytic converter :
1. reduces unburnt hydrocarbon in auto emissions
2. converts NOx to nitrogen
3. reduces lead in the exhaust
4. converts carbon dioxide to carbon monoxide

The group most profoundly affected by global warming normally is :-

1. Plants
2. Insects
3. Birds
4. Mammals

Which of the following radiatively active gases contributes the least to global warming?

1. CO₂

2. CFC

3. N₂O

4. CH₄

What is the percentage of photosynthetic active radiation [PAR] in the incident solar radiation?
1. 100 %
2. 50%
3. 1-5%
4. 2-10%

Which of the following commits industrialized nations to reduce greenhouse gas emissions ?
1. Montreal protocol
2. Kyoto protocal 
3. UNECD earth summit
4. Alma Atta conference 

To safeguard our water resources, the Water (Prevention and Control of Pollution) Act, was passed in:

1. 1951
2. 1974
3. 1985
4. 1987

Eventually, the only solution for the treatment of e-wastes, provided it is carried out in an environment friendly manner, is:
1. Incineration
2. Burying in landfill sites
3. Dumping in developing countries
4. Recycling

Match each item in Column I with one item in Column II and choose the correct answer from the code given below:

Codes:
             A.            B.                   C.              D.
1.          a              b                    c               d

2.          b              a                    d               c

3.          d              c                    b               a

4.          c              d                    a               b

What is eutrophication?

1. The nutrient enrichment of lakes and ponds
2. The decrease in the pH of a lake or pond
3. The increase of water temperature of a lake or pond
4. The depletion of nutrients inlakes and ponds

In what way does thermal pollution affect organisms?
1. Lowers the pH of water
2. Interrupts normal physiological pathways
3. Decreases oxygen supply in water
4. Increases oxygen supply in water