309.  When the reduced level of the water source is higher than the reduced level of the consumer's place, water is generally supplied
A. by pumping system
B. by gravitational system
C. both (a) and (b)
D. all the above.

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310. Water is distributed to consumers by gravitational system, in
A. Dehradun
B. Bombay
C. Delhi
D. Both (a) and (b).

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311.  When gravity and pumping systems of water distribution are adopted, the type of distribution reservoir, is
A. elevated tank
B. ground source reservoir
C. intz tank
D. stand pipe.

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312.  Water having pH value as 6, is
A. alkaline
B. acidic
C. neutral
D. none of these.

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313.  The requirement of water per capita per day, is
A. 90 litres
B. 150 litres
C. 250 litres
D. 400 litres.

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314.  Recuperation test is carried out to determine
A. turbidity of water
B. pH value of water
C. yield of well
D. discharge from a well.

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315.  The pH value of water fit for drinking, is
A.13
B.11
C.9
D.7

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