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Environmental Engineering in CE

Environmental Engineering in CE
Solid content in most of the domestic sewage is about __________ percent.

10
0.001
0.1
5

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Environmental Engineering in CE
Which of the following is not an air pollutant?

Metallic powders
Ozone
Pesticides
Carcinogens

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Environmental Engineering in CE
Sound produced by an automobile horn heard at a distance of 1.5 metres corresponds to about __________ decibels.

90
150
180
120

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Environmental Engineering in CE
Soluble silica present in boiler feed water can be removed by

Filtration
Preheating it
Anion exchanger
Coagulation

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Environmental Engineering in CE
Aerosols present in atmospheric air may be

Positively charged
Combination of all A, B & C
Neutral
Negatively charged

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Environmental Engineering in CE
For existence of aquatic life in water, the dissolved oxygen content in it, should not be less than __________ ppm.

1000
500
5
10000

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