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Environmental Engineering in CE

Environmental Engineering in CE
Death may occur, when SO₂ concentration in atmospheric air exceeds __________ ppm.

400
100
200
20

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Environmental Engineering in CE
Nitrogen oxides (NOx) is not produced in the __________ industry.

Detergent
Any of these
Nitric acid making
Nitrogenous fertiliser

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

19
1
82
7

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Environmental Engineering in CE
Polluted water having low BOD are most economically treated in

Oxidation ponds
Clarifier
Sedimentation tanks
Sludge digester

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Environmental Engineering in CE
Which of the following pollutants is not emitted during volcanic eruptions?

H₂S
Hydrocarbons
CO
SO₂

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Environmental Engineering in CE
A shallow pond in which the sewage is retained and biologically treated is called

Imhoff tank
Oxidation
Lagoon
Skimming tank

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