Civil Engineering - Water Supply Engineering

21. 

An ideal sand for filters should be

A. free from dirt and other impurities
B. uniform in nature and size
C. hard and resistant
D. all the above.

Answer: Option D

Explanation:

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22. 

The maximum non-verticality of the bore of a well 200 m deep, may be permitted up to

A. 25 cm
B. 50 cm
C. 75 cm
D. 100 cm
E. 150 cm.

Answer: Option D

Explanation:

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23. 

By adding 1 ml of orthotolidine solution to 100 ml chlorinated water taken after contact period, the residual chlorine makes the colour of solution

A. yellowish
B. greenish
C. bluish
D. reddish
E. violet.

Answer: Option A

Explanation:

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24. 

From the surface of reservoir, evaporation may be minimised by sprinkling

A. Spirit
B. Hydrochloric acid
C. Cetyl alcohol
D. Methane
E. None of these.

Answer: Option C

Explanation:

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25. 

Gravity conduits are generally in the form of

A. canals
B. flumes
C. aqueduct
D. tunnels
E. all the above.

Answer: Option E

Explanation:

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