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251.

The leakage of sewage from the sewer into the soil surrounding the water is called ex-filtration.

Agree

Disagree

252.

The self cleaning velocity, recommended for Indian conditions, in order to prevent settling down of seqage at the bottom or on the sides of a large sewer is

A.	0.25 m/s	B.	0.50 m/s
C.	0.75 m/s	D.	1.5 m/s

253.

The method in which different types of refuse are collected, carried and disposed off separately is called

A.	conservancy method	B.	dry method
C.	water carriage method	D.	either (a) and (b)

254.

Which of the following statement is wrong?

A.	The water carriage system is more hygienic.	B.	There is no smell or sight nuisance in the case of water carriage system.
C.	The sewers in the water carriage system being all underground do not impair the beauty of the place	D.	The initial cost of construction of water carriage system is very low.

255.

The water carriage sewage system removes

A.	domestic sewage	B.	industrial sewage
C.	storm sewage	D.	all of these

256.

A combined system will be favourable when

A.	the sewers are to be laid in rocks	B.	the finances are limited
C.	the topography is flat necessitating deep excavation for combined sewers	D.	the locality to be served has narrow streets

257.

In combined system, automatic flushing is not possible.

Correct

Incorrect

258.

House plumbing is difficult in

separate

combined

259.

A separate system will be favourable when

A.	the sewers are to be laid in rocks	B.	the finances are limited
C.	the topography is flat necessitating deep excavation for combined sewers	D.	all of the above

260.

The sanitation system in which a small portion of storm water is allowed to enter in the sanitary sewage sewers and the remaining storm water flows in separate set of sewers, is known as

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