Question # 1

About 99% atmosphere's lies within:

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30 kilometre

35 kilometre

15kilometre

11 kilometre

pH of acid rain is:

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7-5

6-7

1-2

4-5

Which gas protects the Earth's surface from ultraviolet radiations?

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CO₂

CO

N₂

O₃

Which factor determines the severity of a pollutant?

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Chemical nature

concentration

Persistence

All of them

Ozone depletion was first noticed is.

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1970's

1980's

1990's

1960's

Ozone is an allotropic form of

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Carbon

Oxygen

Sulphur

Phosphorous

ozone depletion (i.e O3--------------> O2 + O) occurs in:

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lower stratosphere

middle stratosphere

upper stratosphere

troposphere

75% atmosphere mass lies in how many kilometers.

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11 km

30 km

50 km

85 km

Ozone is formed in:

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Troposphere

Stratosphere

Mesosphere

Thermosphere

Which gas is responsible in warming the atmosphere?

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Nitrogen

Hydrogen

Helium

Fluorine

A group of gases that maintains temperature of atmosphere is.

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Carbon dioxide and water vapours

Nitrogen and carbon dioxide

Thermosphere

Troposphere

The recombination of O and O₂ in mid stratosphere is an

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Exothermic reaction

Endothermic reaction

Heat absorbing process

None of these

How many percentage of sunlight is absorbed by atmosphere gases.

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12%

18%

24%

30%

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