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43.

The detention period and overflow rate respectively for plain sedimentation as compared to sedimentation with coagulation are generally

A.	less and more	B.	less and less
C.	more and less	D.	more and more

44.

The detention period in coagulation tanks is usually kept as

A.	1 to 2 minutes	B.	30 to 45 minutes
C.	2 to 6 hours	D.	2 to 6 days

45.

The devices which are installed for drawing water from the sources are called

A.	aquifers	B.	aquiclude
C.	filters	D.	intakes

46.

The dissolved oxygen level in natural unpolluted waters at normal temperature is found to be of the order of

A.	1 mg/litre	B.	10 mg/litre
C.	100 mg/litre	D.	1000 mg/litre

47.

The distribution mains are designed for

A.	maximum daily demand	B.	maximum hourly demand
C.	average daily demand	D.	maximum hourly demand on maximum day

48.

The effective size of sand particles used in slow sand filters is

A.	0.25 to 0.35 mm	B.	0.35 to 0.60 mm
C.	0.60 to 1.00 mm	D.	1.00 to 1.80 mm

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