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Environmental Engineering in CE

Environmental Engineering in CE
From pollution control point of view, the maximum permissible concentration of sulphur dioxide in atmospheric air is about __________ ppm.

500
50
5
1

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Environmental Engineering in CE
Radioactive substances present in the polluted water stream can be removed by

Biological oxygen treatment
Coagulation and filtration
Adsorption in ion exchange materials
None of these

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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)

B
8B
2B
4B

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Environmental Engineering in CE
Presence of iron and manganese in water causes

Reduction in its dissolved oxygen content
None of these
Temporary hardness
Discoloration of bathroom fixtures

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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.

100-200
10-100
100-1000

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Environmental Engineering in CE
Which of the following industries discharge mercury as a pollutant?

Beverage plant
Phosphoric acid plant
Tanneries
Chloro-alkali industry

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