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Environmental Engineering in CE

Environmental Engineering in CE
A gas is termed as non-toxic, if its maximum permissible concentration (TLV) ranges from __________ ppm.

10000 to 100000
6000 to 9000
1000 to 2000
3000 to 6000

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Environmental Engineering in CE
The weakest sound that can be heard by a person in a quiet environment is equivalent to __________ decibel.

20
1
10
5

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Environmental Engineering in CE
Which of the following pollutants, if present in atmosphere is detectable by its odour?

NO₂
CO₂
CO
SO₂

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Environmental Engineering in CE
The upper layer of atmosphere is called the

Stratosphere
Troposphere
None of these
Ionosphere

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Environmental Engineering in CE
Which of the following is an adsorbant used for the removal of SO₂ from gas/air?

Silica gel
Bog iron
Limestone powder or alkalised alumina
Active carbon

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Environmental Engineering in CE
The length of rectangular sedimentation tank should not be more than(Where ‘B’ is the width of the tank)

4B
8B
2B
B

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