Question # 1

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

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

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Eyes

Ears

Stomach

Nose

Photochemical smog mainly consist of

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Higher hydrocarbons

Oxidising agnts

Reducing agent

All of these

The avoid the formation of toxic compounds with chlorine which substance is used for disinfecting water

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KMnO₄

O₃

Alums

Chloramines

The pH of unpolluted rain water should be

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5.00

5.60

6.50

7.00

Which one of the following is secondary pollutant of atmosphere.

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CO

NO2

SO2

H2SO4

How much fresh water is used for domestic purpose

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8%

23%

69%

100%

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

The avoid teh formation of toxic compounds with chlorine which substance is used for disinfecting water.

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KMnO4

O3

Alum

Chloramines

The residence time of NO is

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Few hours

1 day

3 days

4 days

The yellowish colour in photochemical smog is due to the presence of.

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NO

NO2

SO2

CO2

The pH of truly acidic rain is

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7-6.8

6.5-6

6-5.6

less than 5

In water the concentration of dissolved O₂should be

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1-3 ppm

2-4 ppm

4-8 ppm

8-12 ppm

In purification of potable water the coagulant used is

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Nickel sulphate

Copper sulphate

Barium sulphate

Alum

The region of earth capable of supposing life is called.

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Atmosphere

Bisphere

Dithosphere

Hydrosphere

Ozone is mostly produced in

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Tropical region

North polar region

South polar region

Thermosphere zone of atmosphere

Water is disinfected by a substance to avoid toxification

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KMnO₄

Alums

O₃

Cl₂

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