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Environmental Engineering in CE

Environmental Engineering in CE
The pH value of oxidised sewage is about

1.8
13.4
7.3
6.2

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Environmental Engineering in CE
Threshold limit value (TLV) means maximum permissible/acceptable concentration. TLV of phosgene in air is about __________ ppm (parts per million).

0.2
4.8
0.002
1.2

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Environmental Engineering in CE
Septic tanks are used for the __________ of the deposited solids.

None of these
Anaerobic decomposition
Aerobic decomposition
Separation

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Environmental Engineering in CE
Presence of a certain minimum quantity of flourine is desirable in potable water to prevent

Water-borne disease
Corrosion
Dental cavities
Scale formation

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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
50
80
120

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

Stratosphere
Ionosphere
Troposphere
None of these

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