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.

Measuring Biochemical Oxygen Demand (BOD) is a method used for:
1. estimating the amount of organic matter in sewage water.
2. working out the efficiency of oil driven automobile engines.
3. measuring the activity of Saccharomyces cerevisae in producing curd on a commercial scale.
4. working out the efficiency of RBCs about their capacity to carry oxygen.

The Air Prevention and Control of Pollution Act came into force in:
1. 1981
2. 1985
3. 1990
4. 1975

Kyoto Protocol was endorsed at :
1. CoP– 5
2. CoP - 6
3. CoP - 4
4. CoP– 3