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Online Tests
Chemistry 10th Class English Medium Unit 14 Online Test MCQs With Answers
Question # 1
The recombination of O and O
2
in mid stratosphere is an
Choose an answer
Exothermic reaction
Endothermic reaction
Heat absorbing process
None of these
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Question # 2
A strange bitter smell noticed near photocopiers is of:
Choose an answer
SO2
H2S
O2
O3
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Question # 3
Almost all air crafts fly in which reion?
Choose an answer
Troposphere
Stratosphere
Mesosphere
Thermosphere
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Question # 4
Incinerator reduces solid waste into .
Choose an answer
Ash
Flue gas
Heat
All of them
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Question # 5
Which gas protects the Earth's surface from ultraviolet radiations?
Choose an answer
CO
2
CO
N
2
O
3
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Question # 6
Major portion of ozone layer is foun in.
Choose an answer
Troposphere
Stratosphere
Mesosphere
Thermosphere
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Question # 7
What percentage of nitrogen and oxygen is in the atmosphere.
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69%
79%
9%
89%
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Question # 8
Mesophere extend forms 50 km to:
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50 km
12 km
60 km
85 km
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Question # 9
Fossil fuel means.
Choose an answer
Coal
Petroleum
Natural gas
All of them
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Question # 10
Which one of the following is not an air pollutants?
Choose an answer
Nitrogen
Carbon dioxide
Nitrogen oxide
Ozone
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Question # 11
PAN stands for
Choose an answer
Poly aniline nitrate
Proxy acetyl nitrate
Poly acetyl nitrite
Proxy acetyl nitrite
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Question # 12
About 99% of atmospheric mass lies in.
Choose an answer
35 km
30 km
15 km
16 km
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Question # 13
The pH of water containing CO
2
is
Choose an answer
4-6
5.6-6
6-7
7-8
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Question # 14
Which one of the following is not air pollutants?
Choose an answer
N
2
CO
NO
2
O
2
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