INTRODUCTION AND PRECIPITATION

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The percentage of earth covered by oceans is about

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71 %

97 %

31 %

51 %

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The percentage of total quantity of water in the world that is saline is about

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71%

67%

97%

33%

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The percentage of total quantity of fresh water in the world available in the liquid form

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11%

30%

70%

51%

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If the average annual rainfall and evaporation over land masses and oceans of the earth are considered it would be found that

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over the land mass the annual evaporation is the same as the annual precipitation

over the ocean about 19% more rainfall than what is evaporated

about 9% more water evaporates from the oceans than what falls back on them as precipitation

over the oceans about 19% more water evaporates than what falls back on them as

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In the hydrological cycle the average residence time of water in the global

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oceans is larger than that of the global groundwater

atmospheric moisture is larger than that in the global rivers

rivers is larger than that of the global groundwater

oceans is smaller than that of the global groundwater

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A tropical cyclone is a

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zone of low pressure with clockwise winds in the northern hemisphere

zone of low pressure with anticlockwise winds in the northern hemisphere

low-pressure zone that occurs in the northern hemisphere only

high-pressure zone with high winds

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A tropical cyclone in the northern hemisphere is a zone of

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high pressure with clockwise wind

low pressure with clockwise wind

high pressure with anticlockwise wind.

low pressure with anticlockwise wind

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Orographic precipitation occurs due to air masses being lifted to higher altitudes by

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extratropical cyclones

the presence of mountain barriers

a frontal action

the density difference of air masses

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The average annual rainfall over the whole of India is estimated as

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89 cm

189 cm

319 cm

119 cm

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Variability of annual rainfall in India is

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largest in coastal areas

largest in regions of high rainfall

least in regions of scanty rainfall

least in regions of high rainfall

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