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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.

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

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Environmental Engineering in CE
In a sedimentation tank, the detention period for water ranges from __________ hours.

2 to 4
24 to 32
8 to 12
16 to 20

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Environmental Engineering in CE
The detrimental effect on organism and water quality with temperature rise of aquatic system is the reduction of __________ of water.

Biological oxygen demand
Dissolved oxygen content
All of these
Vapor pressure

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Environmental Engineering in CE
Very small amount of air pollutants are present in stratosphere also; though most of the atmospheric pollutants are present in the troposphere. Which of the following atmospheric pollutants does not cause the ozone layer depletion in atmosphere at tremendous rate?

CFC (chloro fluoro carbons)
CO
NOx
SO₂

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Environmental Engineering in CE
Radioactive solid nuclear wastes are disposed off by

Pyrolysis
Underground burial in concrete containers
Pathological incineration
High temperature incineration

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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
105
185
160

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