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Environmental Engineering in CE

Environmental Engineering in CE
Ambient noise level can be reduced by __________ decibels by planting trees (like coconut, neem etc.) near public utility buildings (like hospitals & schools).

43961
25-30
15-20
43832

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Environmental Engineering in CE
World environment day is observed every year on the 5th of

September
July
December
June

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Environmental Engineering in CE
The term Biological Oxygen Demand (BOD) is used in relation to

Cooling water
Potable water
Distilled water
Industrial effluents

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Environmental Engineering in CE
Brown spots in fabrics will be caused by washing with water containing large amount of .

Iodine
Bromine
Iron
Zinc

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

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Environmental Engineering in CE
The pH value of oxidised sewage is about

1.8
6.2
13.4
7.3

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