71) The fall of moisture from the atmosphere to the earth surface in any form, is called

• (a) evaporation
• (b) transpiration
• (c) precipitation
• (d) none of these

72) Liquid precipitation consists of

• (a) snow
• (b) hail
• (c) sleet
• (d) rainfall

73) The hydrology cycle is expressed by the equation [where P = Precipitation, E = Evaporation, and R = Run-off.]

• (a) P = E − R
• (b) P = E + R
• (c) P = E × R
• (d) P = E / R

74) The rainfall hyetograph shows the variation of

• (a) cumulative rainfall with time
• (b) rainfall intensity with time
• (c) rainfall depth over an area
• (d) rainfall intensity with the cumulative rainfall

75) The area under a hyetograph represents

• (a) total run-off received in the period
• (b) total intensity of rainfall received in the period
• (c) total precipitation received in that period
• (d) average intensity of rainfall received in the period