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Environmental Engineering

Environmental Engineering
The velocity of flow of water in a sedimentation tank is about

15 to 30 cm/sec
5 to 10 cm/sec
15 to 30 cm/minute
15 to 30 cm/hour

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Environmental Engineering
Air binding phenomena in rapid sand filters occur due to

Higher turbidity in the effluent
Excessive negative head
Low temperature
Mud ball formation

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Environmental Engineering
If the coli form bacteria is present in a sample of water, then the coli-form test to be conducted is (i) Presumptive coli-form test (ii) Confirmed coli-form test (iii) Completed coli-form test

Both (i) and (ii)
All (i), (ii) and (iii)
Only (i)
Both (i) and (iii)

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Environmental Engineering
The detention period in coagulation tanks is usually kept as

30 to 45 minutes
2 to 6 hours
1 to 2 minutes
2 to 6 days

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Environmental Engineering
The minimum and maximum diameters of sewers shall preferably be

15 cm and 300 cm
60 cm and 300 cm
30 cm and 450 cm
15 cm and 100 cm

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Environmental Engineering
The most common cause of acidity in water is

Carbon dioxide
Oxygen
Hydrogen
Nitrogen

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MORE MCQ ON Environmental Engineering

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