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Environmental Engineering

Environmental Engineering
Orthotolidine test is used for determination of

Dissolved oxygen
Residual chlorine
Dose of coagulant
Biochemical oxygen demand

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Environmental Engineering
The rate of BOD exerted at any time is

Inversely proportional to BOD satisfied
Directly proportional to BOD satisfied
Directly proportional to BOD remaining
Inversely proportional to BOD remaining

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Environmental Engineering
The maximum discharge of a tube well is about

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

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Environmental Engineering
The maximum permissible limit for fluoride in drinking water is

10 mg/liter
1.5 mg/liter
0.1 mg/liter
5 mg/liter

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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

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

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

Lime
Sulphuric acid
Copper sulphate
Sodium permanganate

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