Natural ageing of a lake by biological enrichment of its water is known as:
1. Eutrophication
2. Biomagnification
3. Bioremediation
4. Biofortification

High concentrations of accumulated DDT in birds
1. kills pathogens in their blood
2. causes sterility by affecting gametogenesis
3. leads to premature breaking of eggs
4. causes spasticity of the muscles ofthe body

What was added in 1987 as a pollutant to The Air (Prevention and Control of Pollution) Act, [originally passed in 1981] :
1. radioactive wastes
2. CFCs
3. ground level ozone
4. noise

According to CPCB, what particulate size is most harmful to humans:
1. more than 10 micrometers
2. between 5 to 10 micrometers
3. between 2.5 to 5 micrometers
4. less than 2.5 micrometers

The most effective device to remove particulate matter from polluted air is:
1. electrostatic precipitator
2. cyclonic separator
3. trajectory separator
4. scrubber

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

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