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161.

Slow sand filter is more efficient for the removal of

A.	bacteria	B.	odour
C.	turbidity	D.	all of these

162.

In a rapid sand filter

A.	raw water from the source is supplied	B.	disinfected raw water is supplied
C.	raw water passed through coagulation tank is supplied	D.	any one of the above

163.

The yield of a rapid sand filter is

A.	10 times	B.	15 times
C.	20 times	D.	30 times

164.

An arrangement for back washing is provided in

A.	slow sand filter	B.	sedimentation tank
C.	rapid sand filter	D.	all of these

165.

In a rapid sand filter, the filter head varies from

A.	1 to 1.5 m	B.	1.5 to 2 m
C.	2 to 4 m	D.	4 to 5 m

166.

Cleaning of rapid sand filters is done by

A.	scraping the top layer of filter media	B.	back washing
C.	providing new sand layers	D.	all of these

167.

Cleaning period for a rapid sand filter is taken as

A.	2 to 3 hours	B.	2 to 3 days
C.	2 to 3 weeks	D.	2 to 3 months

168.

Air binding means accumulation of

air

impurities

169.

Rpid sand filters are suitable for small towns and villages.

Yes

170.

Rapid sand filter can remove bacterias upto an extent of

A.	60% to 70%	B.	70% to 80%
C.	80% to 90%	D.	90% to 99%