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11.

Absolute pure water is good for health.

Right

Wrong

12.

The earth's water circulatory system is known as.

A.	water cycle	B.	hydrological cycle
C.	precipitation cycle	D.	all of these

13.

An artesian spring is formed

A.	when an aquifer gets exposed in a valley against a vertical cut	B.	due to continuous fault in a rock through which water under pressure comes out
C.	when a porous strata gets enclosed between two impervious strata	D.	none of the above

14.

The quantity of water available from an infiltration gallery depends upon the

A.	size of gallery	B.	nature of soil
C.	yield of source	D.	all of these

15.

The quality of tube well water is

good

poor

16.

The continuous flow of water may be expected from

A.	surface springs	B.	artesian springs
C.	gravity springs	D.	all of these

17.

The layers such as sand and gravel which allow the water to pass through them are known as

A.	previous layers	B.	aquifers
C.	water bearing strata	D.	all of these

18.

Which of the following statement is correct?

A.	The sub-surface sources are not affected by draught.	B.	Infiltration galleries are most suitable for increasing the surface source supply, in dry season.
C.	The rate at which water percolates into well under safe maximum critical depression head is called yield of well.	D.	all of the above

19.

The artesian spring has too much hydraulic gradient and water flows out automatically.

Right

Wrong

20.

The water bearing strala i.e. layers of sand, gravel etc, is called

A.	an acquifer	B.	an aquiclude
C.	an aquifuge	D.	zone of saturation