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Environmental Engineering in CE

Environmental Engineering in CE
80% less than 200 mesh size particles are called

Aggregates
Smoke
Grit
Powder

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

50
70
25
85

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Environmental Engineering in CE
Atmospheric pollution caused by the exhaust gas of supresonic transport air-crafts is mostly in the atmospheric region called

Thermosphere
Mesosphere
Stratosphere
Troposphere

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Environmental Engineering in CE
A considerable part of the harmful ultraviolet radiation of the sum does not reach the earth surface, because of the fact that, there is a layer of __________ high above earth's atmosphere, which absorbs it.

Hydrogen
None of these
Carbon dioxide
Ozone

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Environmental Engineering in CE
Septic tanks are used for the __________ of the deposited solids.

Aerobic decomposition
Anaerobic decomposition
None of these
Separation

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Environmental Engineering in CE
Salt content in sea water is about __________ percent.

10
1
3.5
0.5

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