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Civil Set-1
Environmental Engineering
31

Environmental Engineering MCQ with Answers

31) The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about

0.01 to 0.05 ppm

0.05 to 0.5 ppm

0.5 to 1.0 ppm

1.0 to 5.0 ppm

Answer is:

0.05 to 0.5 ppm

Environmental Engineering MCQ with Answers

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Related Environmental Engineering MCQ with Answers

32) The dissolved oxygen level in natural unpolluted waters at normal temperature is found to be of the order of

1 mg/litre

10 mg/litre

100 mg/litre

1000 mg/litre

Answer is:

10 mg/litre

33) The velocity of flow of water in a sedimentation tank is about

5 to 10 cm/sec.

15 to 30 cm/sec.

15 to 30 cm/minute

15 to 30 cm/hour

Answer is:

15 to 30 cm/minute

34) The length of rectangular sedimentation tank should not be more than [where B is the width of the tank]

B

2B

4B

8B

Answer is:

4B

35) The overflow rate for plain sedimentation tanks is about

500 to 750 litres/hour/ m2

1000 to 1250 litres/hour/ m2

1250 to 1500 litres/hour/m2

1500 to 2000 litres/hour/m2

Answer is:

500 to 750 litres/hour/ m2

Environmental Engineering MCQ with Answers

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