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Environmental Engineering in CE

Environmental Engineering in CE
Pick out the one which is not a chemical coagulant.

Hydrated lime
Chloramine
Ferrous sulphate
Aluminium sulphate

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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.

135
185
105
160

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

Mesosphere
Stratosphere
Thermosphere
Trophosphere

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Environmental Engineering in CE
Exposure to chemicals having carcinogenic properties cause

Asthma
Cancer
Asphyxiation (suffocation)
Dermatitis (skin disorder)

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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
In clarifiers
By chemical coagulation

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

0.01
0.1
1
4

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