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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
4
5
5.6
6.5
Approximately, what percentage of water vapour is contained by air in tropical rain forest?
1%
2%
3%
4%
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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