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Environmental Engineering in CE

Environmental Engineering in CE
Which of the following is a green house gas other than CO₂ ?

Chlorofluro carbons (CFC)
All of these
Methane
Nitrous oxide

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Environmental Engineering in CE
In a sedimentation tank, the detention period for water ranges from __________ hours.

8 to 12
2 to 4
16 to 20
24 to 32

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Environmental Engineering in CE
Presence of iron and manganese in water causes

None of these
Discoloration of bathroom fixtures
Temporary hardness
Reduction in its dissolved oxygen content

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Environmental Engineering in CE
Color test of water is done with an instrument called

Colorimeter
Turbidimeter
Electro-chemical cell
Tintometer

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Environmental Engineering in CE
Water filtration rate in a slow sand filter ranges from __________ litres/m²/hr.

4000 to 5000
10 to 20
1500 to 2500
100 to 200

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Environmental Engineering in CE
Ambient noise level can be reduced by __________ decibels by planting trees (like coconut, neem etc.) near public utility buildings (like hospitals & schools).

43961
25-30
15-20
43832

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