Ultrasound of how much frequency is beamed into a human body for sonography?

1. 30-40 MHz

2. 15-30 MHz

3. 1-15 MHz

4. 45-70 MHz

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

Photochemical smog pollution does not contain:

1. ozone

2. nitrogen dioxide

3. carbon dioxide

4. PAN (Peroxy Acyl Nitrate)

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

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

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

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

1. Geneva protocol

2. Montreal protocol

3. Kyoto protocol

4. Gothenburg protocol

In which one of the following the BOD (Biochemical Oxygen Demand) of sewage (S), distillery effluent (DE), paper mill effluent (PE) and sugar mill effluent (SE) have been arranged in ascending order?

1. SE < S < PE < DE

2. SE < PE < S <DE

3. PE < S < SE < DE

4. S < DE < PE <SE