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Environmental Engineering in CE

Environmental Engineering in CE
Fresh sewage is __________ in nature.

Acidic
Highly acidic
Neutral
Alkaline

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Environmental Engineering in CE
Noise level during normal conversation among men is about __________ decibles.

90
115
10
45

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Environmental Engineering in CE
Iron & manganese present as pollutant in water can not be removed by

Ion exchange process
Lime soda process or manganese zeolite process
Chlorination
Oxidation followed by settling & filtration

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Environmental Engineering in CE
Threshold limit value (TLV) i.e., the maximum permissible safe limit of phosgene gas which Hitler used to use to kill his enemies in 'gas chamber' is about __________ ppm.

100-200
10-100
100-1000

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Environmental Engineering in CE
Irradiation of water by ultraviolet light of suitable wavelength is commonly used for disinfection of water in

Food industry
Municipal sewage treatment
Iron & steel plant
Petroleum refinery

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Environmental Engineering in CE
What is the major constituents of waste/polluted water discharged from textile, pulp & paper, tanning, distillary, dairy and meat packing industries?

Inorganic pollutants
Radioactive substances
Natural organic products
None of these

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