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Environmental Engineering in CE

Environmental Engineering in CE
Presence of excess flourine in water causes

Respiratory disease
Tooth decay
Fluorosis
Dental cavity

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Environmental Engineering in CE
A considerable part of the harmful ultraviolet radiation of the sum does not reach the earth surface, because of the fact that, there is a layer of __________ high above earth's atmosphere, which absorbs it.

Hydrogen
Ozone
Carbon dioxide
None of these

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Environmental Engineering in CE
Scale formation in boiler is controlled by

Preheating of feed water
Eliminating H₂S in feed water
Reduction in hardness, silica & alumina in feed water
Keeping the pH value of feed water just below 7

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Environmental Engineering in CE
Noise level audible to audience sitting in the 5th row from the stage during a large orchestra show corresponds to about __________ decibels.

185
160
135
105

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Environmental Engineering in CE
World's worst radioactive pollution was caused by nuclear reactor disaster which occured in

Moscow (U.S.S.R.)
Chernobyl (undivided U.S.S.R.)
Pensylvania (U.S.A.)
Arizona (U.S.A.)

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Environmental Engineering in CE
COD of raw municipal sewage may be in the range of about __________ mg/litre.

1500-2500
1-2
90-120
5-10

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