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21.

The layers such as lime stone and snd store which do not allow the water to pass through them are known as

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

22.

The portion of soil through which lateral movement of water takes place is called

A.	water tablean aquiclude	B.	an aquiclude
C.	zone of saturation	D.	none of these

23.

The open wells or dug wells are also known as

A.	shallow wells	B.	draw wells
C.	percolation wells	D.	all of these

24.

The most important source of water for public water supply is

A.	lake	B.	pond
C.	river	D.	sea

25.

The natural outflow of sub-surface water at the surface is termed as spring.

Correct

Incorrect

26.

The open wells or dug wells wells

A.	act as a small storage reservoir	B.	are suitable for a small discharge
C.	are cheap in construction	D.	all of these

27.

The water of a river has an important property called

A.	turbidity	B.	self purification
C.	permeability	D.	infiltration capacity

28.

Which of the following statement is wrong?

A.	The quality of tube well water is better than that of surface sources.	B.	The discharge of tube well is more than that of an open well.
C.	The tube well should not derive water from the first pervious strata.	D.	none of the above

29.

Run-off is the water which flows

A.	in infiltration galleries	B.	in sewer pipes
C.	due to leakage of pipes	D.	in rivers

30.

The formula, F = R - K (1.8 T + 32), for obtaining the annual run-off is known as

A.	Justin's formula	B.	Vermule's formula
C.	Inglis formula	D.	Khosla's formula