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Environmental Engineering

Environmental Engineering
Period of cleaning of slow sand filters is about

24 - 48 hours
10 - 12 days
2 - 3 months
1 - 2 year

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Environmental Engineering
Which of the following values of pH represents a stronger acid?

5
3
4
2

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Environmental Engineering
The design discharge for the combined sewer system shall be taken as

Rainfall + 2 DWF
Rainfall + DWF
Rainfall + 6 DWF
Equal to rainfall

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Environmental Engineering
The chemical most commonly used to increase speed of sedimentation of sewage is

Lime
Sodium permanganate
Copper sulphate
Sulphuric acid

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Environmental Engineering
The maximum discharge of a tube well is about

5 liters/sec
500 liters/sec
1000 liters/sec
50 liters/sec

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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
4000
1000
4,00,000

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