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Environmental Engineering in CE

Environmental Engineering in CE
Noise level during normal conversation among men is about __________ decibles.

90
45
115
10

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Environmental Engineering in CE
Fluorosis (a bone disease) is caused by the presence of high concentration of __________ in atmospheric air.

Hydrogen sulphides
Nitrogen dioxide
Hydrogen flouride
Hydrocarbons

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Environmental Engineering in CE
Presence of dissolved impurities of __________ is responsible for the red brownish color of water.

Arsenic
Bi-carbonates
Carbonates
Iron & manganese

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Environmental Engineering in CE
Most of the atmospheric air pollutants are present in large quantity in

Stratosphere
Trophosphere
Mesosphere
Thermosphere

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Environmental Engineering in CE
Iron & manganese present in the polluted water is removed by

Chlorination only
Chemical coagulation
Simple filtration
Oxidation followed by settling & filtration

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

Oxidation
Dehydration
Reduction
Fermentation

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