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Environmental Engineering in CE

Environmental Engineering in CE
Salt content in sea water is about __________ percent.

0.5
10
1
3.5

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Environmental Engineering in CE
Coal washing waste water containing about 3% suspended solids (comprising of clay, slate, stone etc.) is treated for solid particles removal

In vacuum filter
In sedimentation tanks equipped with mechanical scrapper
By chemical coagulation
In clarifiers

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Environmental Engineering in CE
Photochemical smog is formed from automobile exhaust

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

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Environmental Engineering in CE
Noise level heard inside a bus in busy city traffic or inside a sub-way train corresponds to about __________ decibels.

120
75
95
140

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Environmental Engineering in CE
'Safe limit' called Threshold Limit Value (TLV) of carbon monoxide in atmospheric air is < 50 ppm. The main source of carbon monoxide pollutant in air is the

Automobiles exhaust
Burning of domestic fuel
Photochemical reaction in polluted atmosphere
Industrial chimney exhaust

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Environmental Engineering in CE
Out of the following, TLV of __________ is maximum (about 500 ppm).

Toluene
Acetaldehyde
Carbon disulphide
Carbon dioxide

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