Question # 1

Which one of the following is secondary pollutant of atmosphere.

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CO

NO2

SO2

H2SO4

Ozone depletion in stratosphere region is mainly due to the reaction of O3 with

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O2

SO2

CFCs

All of these

Thickness of the atmosphere is

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100 km

500 km

1000 km

1500 km

The residence time of NO is

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Few hours

1 day

3 days

4 days

Which is a secondary pollutant

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Carbonic acid

CO₂

SO₂

CO

How much fresh water is used for domestic purpose

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8%

23%

69%

100%

Half mass of atmosphere gases is present in.

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5-6 km distance above the surface of earth

10 km above the surface

100 km above the surface

56 km above the surface

A quality of raw water is improved by

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Reduction

Aeration

Dehydration

Incineration

The region of earth capable of supposing life is called.

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Atmosphere

Bisphere

Dithosphere

Hydrosphere

The pH of unpolluted rain water should be

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5.00

5.60

6.50

7.00

Fungicides are teh pesticides which

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Control the growth of fungus

Kill insects

Kill plant

Kill herbs

Fungicides are the pesticides which

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Control the growth of fungus

Kill insects

Kill plants

Kill herbs

The thickness of ozone layer is.

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25 to 50 km

25 to 28 km

3 km only

1 km only

Which one is primary pollutant.

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Peroxyacetyl nitrate

Sulphuric acid

Carbonic acid

Carbon monoxide

Peroxyacetyl nitrate (PAN) is a irritant to human beings and it affects

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Eyes

Ears

Stomach

Nose

In purification of potable water the coagulant used is

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Nickel sulphate

Copper sulphate

Barium sulphate

Alum

Thickness of atmosphere is about how much kilometer above the surface of warth

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100 km

1000 km

10,000 km

unlimited

Whcih water will be considered as polluted water.

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High value of COD

Low value of COD

High value of DO

Low value of BOD

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