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

Global warming can be controlled by:

A scrubber in the exhaust of a chemical industrial plant removes:
1. Gases like sulphur dioxide
2. Particulate matter of the size 5 micrometer or above
3. Gases like ozone and methane
4. Particulate matter of the size 2.5 micrometer or less

The zone of atmosphere in which the ozone layer is found
1. Ionosphere
2. Mesosphere
3. Stratosphere
4. Troposphere

A location with luxuriant growth of lichens on the trees indicates that the: