irrigation water resources engineering and hydrology MCQs – Page 4

Practise focused irrigation water resources engineering and hydrology questions with marked answers for exam preparation and subject revision.

irrigation water resources engineering and hydrology Mcqs

61. A land is known as waterlogged_________________?
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A. none of the above

B. when gravity drainage has ceased

C. capillary fringe reaches the root zone of plants

D. when the permanent wilting point is reached

62. The normal annual precipitation at stations X, A, B and C are 700 mm, 1000 mm, 900 mm and 800 mm respectively. If the storm precipitation at three station A, B and C were 100 mm, 90 mm and 80 mm respectively, then the storm precipitation for station X will be___________________?
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A. 90 mm

B. 105 mm

C. 80mm

D. 70mm

63. The uplift pressure on a dam can be controlled by_________________?
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A. constructing cutoff under upstream face

B. constructing drainage channels bet-ween the dam and its foundation

C. by pressure grouting in foundation</strong>

D. corret answer is?

E. only (1)

F. both (1) and (2)

64. If d is the depth of the aquifer through which water is flowing, then the relationship between permeability k and transmissible T is given by_______________?
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A. T = kd

B. T = k/d

C. k= VTd

D. T= Vkd

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

B. flat water surface

C. concave water surface

D. independent of shape of water surface

66. The total capacity of a reservoir is 25 million cubic metres and dead storage is 5 million cubic metres. If the average volume of sediment deposition is 0.10 million cubic metre per year, then the usefulness of the reservoir will start reducing after_________________?
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A. 200 years

B. 250 years

C. 50 years

D. 150 years

67. The major resisting force in a gravity dam is___________________?
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A. wave pressure

B. uplift pressure

C. self-weight of dam

D. water pressure

68. Which of the following methods of applying water may be used on rolling land ?
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A. furrow flooding

B. boarder flooding

C. check flooding

D. free flooding

69. Optimum depth of kor watering for rice is______________?
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A. 135 mm

B. 165 mm

C. 215 mm

D. 190 mm

70. If the critical shear stress of a channel is xc, then the average value of shear stress required to move the grain on the bank is___________________?
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A. 0.5 xc

B. 1.33 TC

C. 0.75 TC

D. xc

71. Study the following statements?
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A. Spurs are constructed transverse to river flow</strong></span>

B. correct answer is

C. Levees are constructed transverse to river flow

D. Spurs are constructed parallel to river flow

E. ="color: #003f1a;">1. Levees are constructed parallel to river flow

72. The unit hydrograph of a specified duration can be used to evaluate the hydrograph of storms of_________________?
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A. same and shorter duration

B. same duration only

C. same and longer duration

D. any duration

73. For a proportional outlet, the flexibility is______________?
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A. between zero and 1

B. greater than 1

C. 1

D. zero

74. The minimum size of stone that will remain at rest in a channel of longitudinal slope S and hydraulic mean depth R is given by______________?
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A. 15 RS

B. 11 RS

C. 7RS

D. 4RS

75. The flow of water after spilling over the weir crest in chute spillway and side channel spillway respectively are_________________?
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A. at right angle and parallel to weir crest

B. parallel to weir crest in both

C. at right angle to weir crest in both

D. parallel and at right angle to weir crest

76. A unit hydro graph has one unit of_______________?
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A. time base of direct runoff

B. rainfall excess

C. rainfall duration

D. discharge

77. The ratio of the quantity of water stored in the root zone of the crops to the quantity of water actually delivered in the field is known as__________________?
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A. water conveyance efficiency

B. water use efficiency

C. water application efficiency

D. none of the above

78. The best unit duration of storm for a unit hydrograph is________________?
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A. equal to basin lag

B. 1 hour

C. one-fourth of basin lag

D. one-half of basin lag

79. The rainfall on five successive days were measured as 100 mm, 80 mm, 60 mm, 40 mm and 20 mm respectively. If the infiltration index or the storm loss rate for the catchment area is earlier estimated as 50 mm/day, the total surface run off will be________________?
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A. 50 mm

B. 90 mm

C. 60 mm

D. 140 mm

80. The drainage water intercepting the canal can be disposed of by passing the canal below the drainage in___________________?
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A. aqueduct and super passage

B. level crossing

C. super passage and canal syphon

D. aqueduct and syphon aqueduct

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