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Environmental Engineering in CE

Environmental Engineering in CE
When the concentration of SO₂ in air is greater than __________ ppm, it gives a pungent smell.

0.01
4
1
0.1

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Environmental Engineering in CE
TLV of ozone (O₃) and phosgene (COCl₂) in air is __________ ppm.

0.1
100
1000
25

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Environmental Engineering in CE
__________ substances present in sewage are removed in grit chamber during sewage treatment.

Organic
Inorganic
Dissolved
Fatty

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Environmental Engineering in CE
Shouting by a man at his full voice corresponds to a voice level of about __________ decibels.

25
120
50
80

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Environmental Engineering in CE
The pH value of potable water should be between

4 to 5
13 to 14
6.5 to 8
1 to 1.5

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Environmental Engineering in CE
In a sedimentation tank, the detention period for water ranges from __________ hours.

8 to 12
16 to 20
24 to 32
2 to 4

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