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Environmental Engineering in CE

Environmental Engineering in CE
The maximum permissible noise level to which a man working in a chemical plant can be exposed for eight hours per day is about __________ decibels.

60
90
105
120

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

1000
0.1
100
25

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Environmental Engineering in CE
__________ can not control the noise pollution.

Use of silencers
Green house gases
Vibration damping
Tree plantation

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Environmental Engineering in CE
Average human body contains about __________ percent water by weight.

85
70
40
20

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Environmental Engineering in CE
During which of the following operating conditions of an automobile, carbon monoxide content in the exhaust gas is maximum?

Acceleration
Deaccelaration
Idle running
Cruising

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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.

15
0.05
6.5
1

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