Civil Engineering - Water Supply Engineering

26. 

Growth of population can be conveniently represented by

A. an arithmetical curve
B. a semi-logarithmic curve
C. a logistic curve
D. a straight line curve
E. all the above.

Answer: Option C

Explanation:

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27. 

In a well planned city, the layout of distribution pipes generally adopted, is

A. grid-iron system
B. interlaced system
C. reticulation system
D. all the above.

Answer: Option D

Explanation:

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28. 

Air valves are generally provided in pressure pipes of water supply

A. at pipe junctions
B. at summits
C. at low points
D. near service pipes.

Answer: Option B

Explanation:

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29. 

Pick up the correct statement from the following :

A. The water level in a still well, represents the ground water table level
B. The difference between water table level and the water level in a well after pumping, is called depression head
C. The surface of water table surrounding a well during pumping, forms a cone of depression
D. The distance from the centre of the well up to the place where level of water table is not affected, is called radius of influence
E. All the above.

Answer: Option E

Explanation:

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30. 

Bacterias which can survive with or without free oxygen, are known

A. aerobic bacterias
B. anerobic bacterias
C. facultative bacterias
D. none of these.

Answer: Option C

Explanation:

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