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Environmental Engineering in CE

Environmental Engineering in CE
Fresh domestic sewage is __________ in color.

Red
Grey
Black
Dark brown

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Environmental Engineering in CE
A considerable part of the harmful ultraviolet radiation of the sum does not reach the earth surface, because of the fact that, there is a layer of __________ high above earth's atmosphere, which absorbs it.

Hydrogen
Ozone
None of these
Carbon dioxide

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Environmental Engineering in CE
Disinfection of water is done to destroy pathogenic bacteria and thus prevent water-borne diseases. Disinfection of water may be done by the use of

Ozone and iodine
Chlorine or its compounds
Ultraviolet light for irradiation of water
All of these

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Environmental Engineering in CE
Pick out the wrong statement pertaining to 'green house' for the plants.

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Environmental Engineering in CE
In sewage treatment, its sedimentation is speeded up by commonly adding

Lime
Sodium sulphate
Copper sulphate
Hydrochloric acid

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Environmental Engineering in CE
Threshold limit value (TLV) i.e., the maximum permissible safe limit of phosgene gas which Hitler used to use to kill his enemies in 'gas chamber' is about __________ ppm.

10-100
100-1000
100-200

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