Civil Engineering - Water Supply Engineering

6. 

Percussion drilling is unsuitable in

A. unconsolidated sand
B. unconsolidated gravel
C. quick sand
D. consolidated rocks.

Answer: Option D

Explanation:

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7. 

Disinfection of water with ozone is not good because

A. it vanishes before water reaches the consumers
B. it removes the colour, taste and odour from water as bacterias
C. it adds taste to the water
D. it is more efficient than chlorine in killing bacterias
E. none of these.

Answer: Option D

Explanation:

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8. 

An earth formation which, although porous and capable of absoring water does not provide an appreciable supply to wells, is known as

A. acquifer
B. aquiclude
C. aquifuge
D. none of these.

Answer: Option B

Explanation:

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9. 

Mathamoglobinemia, or blue baby disease is caused due to

A. chlorides
B. nitrites
C. nitrates
D. sulphides.

Answer: Option C

Explanation:

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10. 

The main process to purify water by filtration, is

A. mechanical straining
B. flocculation and sedimentation
C. biological metabolism
D. electronic change
E. all the above.

Answer: Option E

Explanation:

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