Page 2 - Assignment-Environmental Issues

8. High concentration 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
9. 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
10. The most effective device to remove particulate matter from polluted air is:
1. electrostatic precipitator
2. cyclonic separator
3. trajectory separator

4. scrubber
B. Very Short Answer Questions (1 mark each)
1. Why should the velocity of air between the plates of an electrostatic precipitator
be low?
2. PM2.5 is responsible for causing greatest harm to human health. What is it? How
is it harmful?
3. What is the noise level that can cause permanent impairment of hearing ability of
human beings?
4. Why was the Montreal Protocol signed?
5. Jhum cultivation has been in practice from earlier days, but its considered more
problematic these days. Why?
6. A radiation causes ageing of skin, skin cancer, and inflamation of cornea called
snow blindness.It also damages DNA. Name the radiation.

C. Short Answer Questions-II (2 marks each)

7. Electrostatic precipitator can remove over 99% particulate matter present in
exhaust from a thermal power plant. How?
8. Why is a scrubber used? Which spray is used on exhaust gases passing through a
scrubber?
9. There is a sharp decline in dissolved oxygen downstream from the point of
sewage discharge.Why? What are its adverse effects?
10. Catalytic converters use expensive metals as catalysts.
(a) Name the metals generally used.
(b) What precaution should be observed while using catalytic converter.
11. What are e-wastes? Why are they creating more problem in developing countries
in comparision to developed countries?