Question # 1

CFCs are mainly used in industries due to

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Low cost

Gaseous nature

High reactivity

Un stability

During thunderstorms, water dissolves

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Dust particles

HCl

Nitric acid

Clouds

Coagulation removes suspended particles in ran water:

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60%

70%

80%

90%

Pathogens in raw water are killed in step:

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aeration

coagulation

chlorination

treatment

Which of following is primary pollutants

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N₂O

PAN

H₂SO₄

None of these

The normal amount of overhead ozone is

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350 DU

450 DU

400 DU

300 DU

Factors affecting quality of water:

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D.O

BOD

COD

a,b,c

CFCs destroy ozone layer. How many ozone molecule a chlorine free radical can destory

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50,000

10,000

20,000

None of these

How much quantity of total water is available as fresh water

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3%

1%

10%

21%

Which of the following does not contribute towards the formation of photochemical smog?

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NO

SO₂

O₃

Hydrocarbons

Air pollution causes

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Acid rain

O₃ depletion

Green House Effect

All

Which of the following waster material is not recycled for use again

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paper

plastic

hides of animals

glass

Major cause of SO2 on global scale is

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Volcanoes

Electric sparks

Combustion

All

Ground and surface waters are contaminated and become polluted due to the human activity. Which human activity will not cause water pollution

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live stock waste

agricultural pesticides

oil beaks and spills

all of the above

In purification of potable water the coagulant used is:

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Nickel sulphate

Copper sulphate

Barium sulphate

Aluminium sulphate

Value of chemical oxygen demand (COD) is a measure of chemically oxidizable matter in water. Which value of COD will indicate more polluted water

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low value

higher value

both values

none of these

The % of CO₂in the atmosphere is

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3.0%

0.03%

0.3%

0.5%

The largest item which is recycled is

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newspaper

plastic

aluminium

oil

Heat balance of earth is maintained by sphere:

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Hydrosphere

atmosphers

lithosphere

biosphere

Density of water becomes maximum at

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10°C

4°C

5°C

12°C

The words smog is a combination of smoke and:

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fog

foke

fork

fizzy

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