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

In a coal fired power plant electrostatic precipitators are installed to control emission of:-

1. SO₂ 

2. NO_x

3. SPM

4. CO

Which one of the following is not a bioindicator of water pollution?

1. Sludge-worms

2. Blood-worms

3. Stone flies

4. Sewage fungus

The "blue baby' syndrome results from

1. excess of chloride

2. methaemoglobin

3. excess of dissolved oxygen

4. excess of TDS (Total Dissolved Solids)

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

4. 1985

Limit of BOD prescribed by Central Pollution Control Board for the discharge of industrial

and municipal waste water into natural surface water, is

1. < 3.0 ppm

2. < 10 ppm

3. < 100 ppm

4. < 30 ppm

Checking of re-radiating heat by atmospheric CO₂ methane, ozone, dust is known as 

1. green house effect

2. radioactive effect

3. ozone layer

4. solar effect.

Chronic exposure to arsenic causes ?

1. blue-baby syndrome

2. foot and mouth disease

3. dropsy

4. itai-itai disease

Green muffler is used against which type of pollution ?

1. Air

2. Water

3. Soil

4. Noise

Biochemical Oxygen Demand (BOD) is a measure of

1. industrial wastes poured into water bodies

2. extent to which water is polluted with organic compounds 

3. amount of carbon monoxide inseparably

4. amount of oxygen needed by green plants during night.