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Environmental Engineering in CE

Environmental Engineering in CE
Maximum permissible residual chlorine in treated water should be __________ mg/litre.

5 to 10
2 to 3
0.001 to 0.01
02 to 0.3

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Environmental Engineering in CE
Septic tanks are used for the __________ of the deposited solids.

Aerobic decomposition
Anaerobic decomposition
None of these
Separation

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Environmental Engineering in CE
Particles having diameter greater than 75 μm (micrometer = 10-6 mm) are called

Smoke
Dust
Grit
Powder

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Environmental Engineering in CE
Which of the following plants does not emit appreciable amount of SO₂ in atmosphere?

Thermal power plant
Sulphuric acid plant
Nitric acid plant
Petroleum refinery

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Environmental Engineering in CE
Foul odour and bad taste of water is removed by treating with

Activated carbon
Alum
Copper sulphate
Bleaching powder

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Environmental Engineering in CE
Noise level audible to audience sitting in the 5th row from the stage during a large orchestra show corresponds to about __________ decibels.

135
160
185
105

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