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Environmental Engineering in CE

Environmental Engineering in CE
Which is the most practical and economical method for removal of suspended solid matter from polluted water?

Chlorination
Skimming off
Biological oxidation
Sedimentation

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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.

6.5
15
0.05
1

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Environmental Engineering in CE
Which of the following causes death by asphyxiation, if its presence in atmospheric air exceeds maximum allowable concentration (i.e. > 50 ppm)?

Peroxyacyl nitrate
Sulphur dioxide
Benzopyrene
Carbon monoxide

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Environmental Engineering in CE
The main type of sludge gas evolved during sewage treatment in Imhoff tank is

H₂
CO
CO₂
CH₄

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

Pesticides
Ozone
Metallic powders
Carcinogens

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Environmental Engineering in CE
High concentration of carcinogenic hydrocarbon pollutants in atmospheric air causes

Cancer
Reduced crop yield
Silicosis
Respiratory disease (e.g., asthma)

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