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Environmental Engineering

Environmental Engineering
If Biochemical oxygen demand (BOD) of a town is 20000 kg/day and BOD per capita per day is 0.05 kg, then population equivalent of town is

1,00,000
1000
4,00,000
4000

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Environmental Engineering
The correct relation between theoretical oxygen demand (TOD), Biochemical oxygen demand (BOD) and Chemical oxygen demand (COD) is given by

COD > BOD > TOD
TOD > BOD > COD
TOD > COD > BOD
BOD > COD > TOD

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Environmental Engineering
The specific gravity of sewage is

Much greater than 1
Slightly greater than 1
Equal to 1
Slightly less than 1

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Environmental Engineering
If the sewage contains grease and fatty oils, these are removed in

Grit chambers
Sedimentation tanks
Skimming tanks
Detritus tanks

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Environmental Engineering
For normal sludge, the value of sludge index for Indian conditions is

0 to 50
150 to 350
350 to 500
50 to 150

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Environmental Engineering
In chlorination, with the rise in temperature of water, death rate of bacteria

None of these
Increases
Decreases
Remains unaffected

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MORE MCQ ON Environmental Engineering

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