According to Central Pollution Control Board (CPCB), Which particulate size in diameter (in
micrometres) of the air pollutants is responsible for greatest harm to human health
1. 1•0 or less
2. 5•2-2•5
3. 2•5 or less
4. 1•5 or less

Montreal Protocol aims at
1. Control of ${\mathrm{CO}}_2$ emission
2. Reduction of ozone depleting substances
3. Biodiversity conservation
4. Control of water pollution

Chipko movement was launched for the protection of
1. Wet Lands
2. Grasslands
3. Forests
4. Livestock

The two gases making the highest relative contribution to the greenhouse gases are:
1. ${\mathrm{CH}}_4$ and ${\mathrm{N}}_2\mathrm{O}$
2. CFCs and ${\mathrm{N}}_2\mathrm{O}$
3. ${\mathrm{CO}}_2$ and ${\mathrm{N}}_2\mathrm{O}$ 
4. ${\mathrm{CO}}_2$ and ${\mathrm{CH}}_4$

dB is a standard abbreviation used for the quantitative expression of
1. A particular pollutant
2. The dominant Bacillus in a culture
3. Certain pesticides
4. The density of bacteria in a medium

Eutrophication is often seen in
1. Deserts
2. Fresh water lakes
3. Ocean
4. Mountains

Which one of the following expanded forms of the following acronyms is correct
1. IPCC= International Panel for Climate Change
2. UNEP = United Nations Environmental Policy
3. EPA = Environmental Pollution Agency
4. IUCN = International Union for Conservation of Nature and Natural Resources

Which one of following pairs of gases are the major cause of "Greenhouse effect"
1. ${\mathrm{CO}}_2$ and ${\mathrm{O}}_3$
2. ${\mathrm{CO}}_2$ and CO
3. CFCs and ${\mathrm{SO}}_2$
4. ${\mathrm{CO}}_2$ and ${\mathrm{N}}_2\mathrm{O}$

"Good ozone" is found in the:
1. Mesosphere
2. Troposphere
3. Stratosphere
4. Ionosphere

Which one of the following is a wrong statement?
1. Most of the forests have been lost in tropical areas.
2. Ozone in upper part of atmosphere is harmful to animals.
3. Greenhouse effect is a natural phenomenon.
4. Eutrophication is a natural phenomenon in freshwater bodies.