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Environmental Engineering in CE

Environmental Engineering in CE
Maximum permissible limit of mercury in human blood is __________ micrograms/100 c.c.

7
82
19
1

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Environmental Engineering in CE
Which of the following processes is involved in the biochemical treatment of sewage effluents?

Oxidation
Reduction
Dehydration
Fermentation

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Environmental Engineering in CE
Workers working in __________ industry are most prone to white lung cancer.

Coal mining
Limestone mining
Textile
Asbestos

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Environmental Engineering in CE
__________ is removed from water by lime-soda process.

Temporary hardness
Permanent hardness
Foul smell and taste
Iron and manganese

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Environmental Engineering in CE
A masonry structure built below ground level, where biochemical reaction takes place due to anaerobic bacteria is called

Skimming mill
Septic tank
Cesspool
Lagoon

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Environmental Engineering in CE
Permissible safe limit (TLV) of __________ toxic gas is 100-1000 parts per million (ppm).

Moderately
Highly
Very extremely
Extremely

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