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Environmental Engineering in CE

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

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

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Environmental Engineering in CE
Noise level in a quiet private business office is about __________ decibels.

50
85
25
70

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Environmental Engineering in CE
Biological oxidation ponds remove organic matters present in the polluted water by

Aerobic oxidation
Neither A nor B
Both A & B
Using the activities of bacteria and other micro organisms

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Environmental Engineering in CE
Main pollutants released from iron & steel industry is

CO₂, H₂S & NO₂
H₂S, NO & SO₃
CO, CO₂ & SO₂
SO₃, NO₂ & CO₂

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Environmental Engineering in CE
In water chemical treatment plant, use of chloramines ensures

Disinfection
Taste & odour control
Removal of permanent hardness
Weed control in reservoirs

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Environmental Engineering in CE
There are five concentric layers within the atmosphere which is differentiated on the basis of temperature. The atmospheric layer which lies close to the earth's surface in which human being along with other organisms live is called troposphere. The rate at which air temperature in the troposphere gradually decreases with height is about __________ °C/km.

1
0.05
6.5
15

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