irrigation water resources engineering and hydrology MCQs – Page 3

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

41. Hydrodynamic pressure due to earthquake acts at a height of_________________?
0

A. 4H737t below the water surface where H is the depth of water

B. 3H/47I above the base

C. 4H/371 above the base

D. 3H747t below the water surface

42. Trap efficiency of a reservoir is a function of_______________?
0

A. none of the above

B. capacity/inflow ratio

C. outflow/inflow ratio

D. capacity/outflow ratio

43. Which of the following types of rain gauges is used for measuring rain in remote hilly inaccessible areas ?
0

A. floating type

B. weighing type

C. Simons raingauge

D. tipping bucket type

44. A straight glacis type fall with a baffle platform and a baffle wall is called_____________?
0

A. vertical dropfall

B. Montague type fall

C. glacis fall

D. inglis fall

45. A runoff river plant_________________?
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A. has no pondage at all

B. is suitable only on a perennial river

C. generates power during peak hours only

D. is a medium head scheme

46. Which of the following spillways is least suitable for an earthen dam ?
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A. ogee spillway

B. chute spillway

C. side channel spillway

D. shaft spillway

47. A 70% index of wetness means_______________?
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A. rain deficiency of 30%

B. rain deficiency of 70%

C. rain excess of 30%

D. none of the above

48. Irrigation water having the concentration of Na++ , Ca++ and Mg++ as 20, 3 and 1 Milli equivalent per litre respectively will be classified as__________________?
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A. medium sodium water

B. very high sodium water

C. high sodium water

D. low sodium water

49. The stage of river carrying a discharge of Q m7sec at a point is 10 m and slope of water surface is (1/4000). The discharge of a flood at the same point and same stage of 10 m with a water surface slope of(l/1000) will be________________?
0

A. 4 Q m3/sec

B. 0.5 Q mVsec

C. V2 Q m3/sec

D. 2 Q m3/sec

50. The main function of a divide wall is to_______________?
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A. prevent river floods from entering the canal

B. control the silt entry in the canal

C. provide smooth flow at sufficiently low velocity

D. separate the undersluices from weir proper

51. The ratio of the average load to the installed capacity of the plant whose reserve capacity is zero will be equal to__________________?
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A. load factor

B. plant factor

C. utilisation factor

D. both (A) and (B)

52. The ratio of average values of shear stresses produced on the bed and the banks of a channel due to flowing water is________________?
0

A. equal to 1

B. equal to zero

C. less than 1

D. greater than 1

53. An artesian aquifer is the one where______________?
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A. none of the above

B. water is under pressure between two impervious strata

C. water table serves as upper surface of zone of saturation

D. water surface under the ground is at atmospheric pressure

54. If the intensity of rainfall is more than the infiltration capacity of soil, then the infiltration rate will be______________?
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A. equal to infiltration capacity

B. more than infiltration capacity

C. equal to rate of rainfall

D. more than rate of rainfall

55. An aggrading river is a_________________?
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A. silting river

B. scouring river

C. both silting and scouring river

D. neither silting nor scouring river

56. A 6 hours storm had 4 cm of rainfall and the resulting runoff was 2 cm. If <j) index remains at the same value, the runoff due to 10 cm of rainfall in 12 hours in the catchment is___________________?
0

A. 7.5 cm

B. 6.0 cm

C. 9.0 cm

D. 4.5 cm

57. The uplift pressure on the face of a drainage gallery in a dam is taken as_________________?
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A. average of hydrostatic pressure at toe and heel

B. two-third of hydrostatic pressure at toe plus one-third of hydrostatic pressure at heel

C. none of the above

D. hydrostatic pressure at toe

58. A repelling groyne is aligned________________?
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A. pointing downstream

B. parallel to bank

C. perpendicular to bank

D. pointing upstream

59. Assertion A : To estimate the rainfall over a catchment, the number of raingauges required per unit area is large for hilly areas. Reason R : Rainfall gradient is steep. Select your correct answer according to the coding system given below ?
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A. Both A and R are true and R is the correct explanation of A

B. Both A and R are true but R is not the correct explanation of A

C. A is true but R is false

D. A is false but R is true

60. The most suitable material for the central impervious core of a zoned embankment type dam is_______________?
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A. clay mixed with fine sand

B. coarse sand

C. clay

D. silty clay

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