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19.

Cyclonic precipitation is caused by lifting of an air mass due to

A.	pressure difference	B.	temperature difference
C.	natural topographical barriers	D.	all of the above

20.

Which of the following is a non-recording raingauge ?

A.	tipping bucket type raingauge	B.	Simon's raingauge
C.	Steven's weighing type raingauge	D.	floating type raingauge

21.

A raingauge should preferably be fixed

A.	near the building	B.	under the tree
C.	in an open space	D.	in a closed space

22.

Which of the following types of rain gauges is used for measuring rain in remote hilly inaccessible areas ?

A.	tipping bucket type	B.	weighing type
C.	floating type	D.	Simon's raingauge

23.

A 70% index of wetness means

A.	rain excess of 30%	B.	rain deficiency of 30%
C.	rain deficiency of 70%	D.	none of the above

24.

Under the same conditions, which of the following shapes of water surface will give the highest rate of evaporation ?

A.	flat water surface	B.	convex water surface
C.	concave water surface	D.	independent of shape of water surface

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