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Environmental Engineering in CE

Environmental Engineering in CE
When the concentration of SO₂ in air is greater than __________ ppm, it gives a pungent smell.

0.01
4
1
0.1

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

82
1
7
19

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Environmental Engineering in CE
The function of skimming tank in sewage treatment is to remove __________ substances.

Oil & fatty
Dissolved solid
Suspended solid
Gritty & inorganic

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Environmental Engineering in CE
Which of the following is the most lethal water pollutant?

Alkalis
Suspended solids
Phenol and cynide
Chlorine

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Environmental Engineering in CE
Solid content in most of the domestic sewage is about __________ percent.

0.001
0.1
5
10

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

Skimming tank
Lagoon
Imhoff tank
Oxidation

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