Select the correct option regarding relative contribution of various greenhouse gases to total global warming.
1. ${\mathrm{CO}}_2>\mathrm{CFCs}>{\mathrm{N}}_2\mathrm{O}>{\mathrm{CH}}_4$
2. ${\mathrm{CH}}_4>{\mathrm{CO}}_2>{\mathrm{N}}_2\mathrm{O}>\mathrm{CFCs}$
3. ${\mathrm{N}}_2\mathrm{O}>{\mathrm{CO}}_2>\mathrm{CFCs}>{\mathrm{CH}}_4$
4. ${\mathrm{CO}}_2>{\mathrm{CH}}_4>\mathrm{CFCs}>{\mathrm{N}}_2\mathrm{O}$

Which one is not an example of primary pollutants?
1. DDT                  2. CO
3. Pollen                4. PAN

In which part of the atmosphere ‘good ozone’ is found?
1. Troposphere                       2. Stratosphere
3. Ionosphere                        4. Exosphere

Which one is not an effect of increase in the level of greenhouse gases?
1. ${\mathrm{CO}}_2$ fertilisation effect.
2. EI Nino effect.
3. Snow blindness.
4. Warming of troposphere and cooling of stratosphere and thermosphere

Which statement is incorrect for photochemical smog?
1. It is mainly ${\mathrm{O}}_3$, PAN and ${\mathrm{NO}}_{\mathrm{X}}$.
2. It is called brown air and grey air.
3. It causes blue-baby syndrome.
4. It is formed in traffic congested cities where warm condition and intense solar radiations are present.

It has been recommended that storage of nuclear waste, after sufficient pre-treatment, should be done in suitably shielded containers buried within rocks about _____ deep below the earth’s surface.

1. 100 m

2. 50 m

3. 500 m

4. 200 m

Practical, hygienic, efficient and cost effective solution to human waste disposal is :-
1. Natural toilets

2. Eco-friendly toilets

3. Eco-san toilets

4. Biological sanitation

In which device the exhaust is passed through a spray of water or lime for removal of gases as well as particles ?

1. ESP
2. Scrubber
3. Catalytic converter
4. Both (1) and (2)

Select the correct match with respect to pollutants :-

I                                                              II

1. Itai-Itai                                                i.Cd

2. Methaemoglobinemia                         ii. Hg

3. Acid Rain                                             iii. CFC

4. Most effective green house gas           iv. Stone cancer

Which phenomenon is indicated by below reaction:-
$\mathrm{HC}+\mathrm{NO}+{\mathrm{O}}_2\stackrel{\mathrm{UV}/\mathrm{Light}}{\to }{\mathrm{O}}_2+\mathrm{PAN}+{\mathrm{O}}_3$

1. Acid rain
2. Photochemical smog
3. Ozone depletion
4. Sulphur smog