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Environmental Engineering in CE

Environmental Engineering in CE
TLV of ozone (O₃) and phosgene (COCl₂) in air is __________ ppm.

0.1
100
1000
25

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Environmental Engineering in CE
In water treatment plant, zeolite process is used to remove the __________ of water.

Hardness
Acidity
Alkalinity
Iron & zinc

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Environmental Engineering in CE
Disinfection of water is done to destroy pathogenic bacteria and thus prevent water-borne diseases. Disinfection of water may be done by the use of

Ultraviolet light for irradiation of water
Ozone and iodine
All of these
Chlorine or its compounds

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

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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
140
75
95

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Environmental Engineering in CE
In sewage treatment, its sedimentation is speeded up by commonly adding

Lime
Hydrochloric acid
Copper sulphate
Sodium sulphate

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MORE MCQ ON Environmental Engineering in CE

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