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Environmental Engineering in CE

Environmental Engineering in CE
The length of rectangular sedimentation tank should not be more than(Where ‘B’ is the width of the tank)

8B
2B
4B
B

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Environmental Engineering in CE
Septic tank is a(i) Settling tank(ii) Digestion tank(iii) Aeration tank

Only (iii)
(i) and (ii)
Only (i)
(i) and (iii)

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Environmental Engineering in CE
Disinfection of water is done to remove

Foul odour
Color
Bacteria
Bad taste

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Environmental Engineering in CE
Oil and grease present in an emulsified state in waste water discharged from industries can be removed by

Settling out using chemical reagents
Biological oxidation
Chlorination
Skimming off

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Environmental Engineering in CE
Noise level inside a jet air liner in normal flight is about __________ decibels.

80
100
145
125

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Environmental Engineering in CE
TLV of NO₂ & NO exposure for the human being is 5 & 25 ppm respectively. Prolonged exposure of human being to NO₂ causes

Bronchitis
Cancer
Skin disorder
Bone disease

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