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Environmental Engineering in CE

Environmental Engineering in CE
Which is the most practical and economical method for removal of suspended solid matter from polluted water?

Sedimentation
Biological oxidation
Skimming off
Chlorination

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

5
1
50
500

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Environmental Engineering in CE
Dust collection efficiency of a cyclone separator depends upon its

Overall height
Inlet gas velocity
All of these
Diameter

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Environmental Engineering in CE
Siderosis is a disease caused by the inhalation of __________ dust.

Silica
Iron
None of these
Coal

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Environmental Engineering in CE
Photochemical smog is formed from automobile exhaust

Is harmful for crops and trees also besides causing eye irritation & asthma
By reaction of hydrocarbon & nitric oxide in presence of sunlight
All of these
Appears only on sunny days

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Environmental Engineering in CE
Waste/polluted water discharged from electroplating, blast furnace and coal mining industries contain mainly __________ substances.

None of these
Radioactive
Organic
Inorganic

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