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Ozone formation and destruction are powered by

Oxygen gas

Atomic Oxygen

UV radiation

None of these

Majority of UV rays are screened out by

Oxygen

Nitrogen

Ozone

Carbon

Which of following comes mainly due to combustion of fuel used in motor vehicles?

CFCs

Methane

Carbon monoxide

Lead compounds

Which of following is Third layer of atmosphere as one moves upwards from Earth's surface?

Troposphere

Stratosphere

Mesosphere

Thermosphere

PH of normal rain water is

5.6

6.5

Approximately, what percentage of water vapour is contained by air in tropical rain forest?

Which of following is true about nitric oxide?

It is colourless

It has an irritating odour

It is not toxic

It is not harmful

Presence of which of following can be felt near photocopier, television set, microwave oven etc?

CFCs

Methane

Ozone

Lead compounds

Extension of troposphere above Earth's surface is

12km

50km

80km

None

Energy of sunlight is converted into heat by

Oxygen

Nitrogen

A % B

None

Height of mesosphere is

0-12 km

12-50 km

50-80 km

Above 80 km

Percentage of methane in air is

0.0018%

0.00052%

0.00015%

0.00011%

Which of following is first layer of atmosphere as one moves upwards from Earth's surface?h

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