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141.

The chief source of water is

A.	Well water	B.	River water
C.	Sea water	D.	Rain water

142.

Tides occur twice in every

A.	22 hours	B.	25 hours
C.	24 hours, 52 seconds	D.	30 hours

143.

The occurrence of Neap Tides is

A.	Once a fortnight	B.	During the night
C.	Thrice a week	D.	During the day

144.

When do spring tides occur?

A.	Twice a month	B.	At full moon or new moon
C.	During the summer	D.	During the spring season

145.

How are rivers useful to humanity?

A.	They provide fish	B.	They provide drinking water to people
C.	They are useful as means of transport	D.	All the above

146.

What is an archipelago?

A.	A deep spring	B.	A group
C.	A group of islands	D.	A high mountain cliff

147.

The phenomena of the wearing away of the part of earth's surface by the action of the wind, water etc., is known as

A.	Abrasion	B.	Erosion
C.	Denudation	D.	Weathering

148.

A cape is

A.	Piece of land abutting into the sea	B.	A cap worn by a fool
C.	Name given to large species of crocodile	D.	None of the above

149.

Artesian wells are

A.	Wells dug by artisans	B.	Wells bored to reach underground water which is lifted by any device
C.	They are not wells at all but craters formed on the moon	D.	None of the above

150.

An Atoll is:

A.	A group of islands having sea water all around.	B.	Coral island or reef, usually an incomplete ring enclosing a lagoon
C.	Lines connecting parts of the same altitude above the sea level	D.	A chain of rocks lying at the sea