Question # 1

99% of atmosphere consists of .

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N₂and H₂

N₂and O₂

N₂and CO₂

O₂and CO₂

The stratosphere layer is at height above the earth's surface.

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0-12 km

12-50 km

50-85 km

65-120 km

Which is not a character of SO₂

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it is a colourless gas

It has irritating smell

It causes suffocation

It do not form sulphuric acid

Mesophere extend forms 50 km to:

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50 km

12 km

60 km

85 km

The gas used by animals to perform respiration.

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O₂

N₂

SO₂

Cl₂

In the troposphere (lowest layer), the temperature decreases form 17°C to;

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-58°C

-93°C

-61°C

-49°C

Major portion of ozone layer is foun in.

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Troposphere

Stratosphere

Mesosphere

Thermosphere

Ozone is beneficial for us as it

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Absorb infrared radiation.

Absorb Ultraviolet radiations.

Absorb Chlorofluorocarbons

Absorb Air pollulant

Which pollutant is responsible for changing weather?

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Air pollutant

Water pollutant

Soil pollutant

All of them

Atmospheric region found between 50-58 km from the earthis.

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Thermosphere

Stratosphere

Mesophere

Thermosphere

Effects of ozone depletion are following except the one.

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Increases infectious diseases

Increases crops production

Can cause skin cancer

Can cause climatic changes.

Iron and steel structure are damaged by.

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Carbon monoxide

Sulphur dioxide

Methane

Carbon dioxide

A strange bitter smell noticed near photocopiers is of:

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SO2

H2S

O2

O3

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