If an agricultural field is liberally irrigated for a prolonged period of time, it is likely to face the problem of:

1.	Metal Toxicity	2.	Alkalinity
3.	Acidity	4.	Salinity

Which of the following is an innovative remedy for plastic waste?

1. Burning in the absence of oxygen

2. Burying 500 m deep below the soil surface

3. Polyblend

4. Electrostatic precipitator

Which of the following statements about ozone is correct?

1. Tropospheric ozone protects us from UV radiation

2. Stratospheric ozone is 'bad'

3. Tropospheric ozone is 'good'

4. Stratospheric ozone protects us from UV radiation

Which of the following protocols did aim for reducing the emission of chlorofluorocarbons into the atmosphere?

1. Geneva protocol

2. Montreal protocol

3. Kyoto protocol

4. Gothenburg protocol

Polyblend, a fine powder of recycled modified plastic, has proved to be a good material for:
1. making tubes and pipes
2. making plastic sacks
3. use as a fertilizer
4. construction of roads

Which of the following pairs of gases is mainly responsible for green house effect?

1. Carbon dioxide and methane

2. Ozone and Ammonia

3. Oxygen and Nitrogen

4. Nitrogen and Sulphur dioxide

Which of the following methods is the most suitable for the disposal of nuclear waste?

The limit of BOD prescribed by Central Pollution Control Board for the discharge of industrial and municipal wastewater into natural surface water is:

1. < 3.0 ppm

2. < 10 ppm

3. < 100 ppm

4. < 30 ppm

Photochemical smog pollution does not contain:

1. ozone

2. nitrogen dioxide

3. carbon dioxide

4. PAN (Peroxy Acyl Nitrate)

Montreal protocol which calls for appropriate action to protect the ozone layer from human activities was passed in the year:

1. 1986

2. 1987

3. 1988

3. 1985