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13.

Chlorine demand of water is equal to

A.	applied chlorine	B.	residual chlorine
C.	sum of applied and residual chlorine	D.	difference of applied and residual chlorine

14.

Disinfection efficiency is

A.	reduced at higher pH value of water	B.	unaffected by pH value of water
C.	increased at higher pH value of water	D.	highest at pH value equal to 7

15.

Disinfection of water results in

A.	removal of turbidity	B.	removal of hardness
C.	killing of disease bacteria	D.	complete sterilisation

16.

Double filtration is used

A.	to increase the filtration slow sand filters capacity of	B.	to increase the filtration rapid sand filters capacity of
C.	for isolated buildings like pools, hotels etc swimming	D.	all of the above

17.

For a country like India, where rainfall is mainly confined to one season, the suitable sewerage system will be

A.	separate system	B.	combined system
C.	partially combined system	D.	partially separate system

18.

For a given discharge, the efficiency of sedimentation tank can be increased by

A.	increasing the depth of tank	B.	decreasing the depth of tank
C.	increasing the surface area of tank	D.	decreasing the surface area of tank

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