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irrigation water resources engineering and hydrology MCQs

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
1. Which of the following canal structures is used to remove surplus water from an irrigation channel into a natural drain ?
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A. canal fall

B. canal regulator

C. canal escape

D. canal outlet

2. Vertical drop fall is satisfactory for a height upto ___________?
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A. 0.5 m

B. 5.0 m

C. 3.5 m

D. 1.5 m
3. River training for depth is achieved by_______________?
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A. groynes

B. construction of dykes or leavees

C. both (A) and (B)

D. groynes and bandalling
4. As per Laceys theory, the silt factor is_________________?
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A. inversely proportional to average particle size

B. not related to average particle size

C. directly proportional to average particle size

D. directly proportional to square root of average particle size
5. The ratio of rate of change of the discharge of an outlet to the rate of change of the discharge of distributing channel is called________________?
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A. proportionality

B. flexibility

C. sensitivity

D. setting

6. The area between the isohyets 45 cm and 55 cm is 100 square km and between 55 cm and 65 cm is 150 square km. The average depth of annua! precipitation over the above basin of 250 square km will be__________________?
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A. 60 cm

B. 55 cm

C. 56 cm

D. 50 cm

7. The value of Sodium Absorption Ratio for high sodium water lies between________________?
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A. 26 to 34

B. 10 to 18

C. 0 to 10

D. 18 to 26
8. For wave action in dams, the maximum height of freeboard is generally taken to be equal to_______________?
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A. 0.5 hw

B. 0.75 hw

C. 1.25 hw

D. 1.50 hw
9. S-hydrograph is used to obtain unit hydrograph of________________?
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A. shorter duration from longer duration

B. longer duration from shorter duration

C. both (A) and (B)

D. none of the above

10. A multipurpose reservoir is the one which is_________________?
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A. designed for one purpose but serves more than one purpose

B. planned and constructed to serve various purposes

C. both (A. and (B.

D. none of the above

11. The flow-mass curve is graphical representation of__________________?
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A. cumulative discharge and time

B. discharge and time in chronological order

C. discharge and percentage probability of flow being equaled or exceeded

D. cumulative discharge, volume and time in chronological order
12. The water stored in the reservoir below the minimum pool level is called_______________?
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A. valley storage

B. dead storage

C. useful storage

D. surcharge storage

13. Seepage through foundation in an earthen dam is controlled by providing___________________?
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A. horizontal blanket

B. impervious cut off

C. rock toe

D. chimney drain

14. As compared to crest of the normal portion of the weir, the crest of the under sluice portion of weir is kept at_____________?
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A. same level

B. higher level

C. lower level

D. any of the above depending on the design

15. The maximum average depth due to one day storm over an area of 100 km2 is 100 mm. Depth-Area-Duration (DAD. curves indicate that for the same area of 100 km2 the maximum average depth for a 3 hour storm will be__________________?
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A. none of the above

B. more than 100 mm

C. 100 mm

D. less than 100 mm

16. According to Khoslas theory, the exit gradient in the absence of a downstream cutoff is_____________?
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A. very large

B. unity

C. infinity

D. 0

17. The sensitivity of a rigid module is_______________?
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A. 1

B. zero

C. infinity

D. between zero and one

18. The unit hydrograph due to a storm may be obtained by dividing the ordinates of the direct runoff hydrograph by_______________?
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A. period of storm

B. direct runoff volume

C. total rainfall

D. none of the above

19. Which of the following is a non-recording raingauge ?
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A. Stevens weighing type raingauge

B. tipping bucket type raingauge

C. floating type raingauge

D. Simons raingauge
20. The meander pattern of a river is developed by_________________?
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A. average discharge

B. maximum discharge

C. dominant discharge

D. critical discharge

21. If it rains between 2 P.M. and 3 P.M. and the entire basin area just starts contributing water at 3 P.M. to the outlet, then time of concentration will be_____________________?
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A. 30 minutes

B. 20 minutes

C. 60 minutes

D. 15 minutes

22. A river bend characterized by silting_______________?
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A. scouring on concave side

B. scouring on concave side and silting on convex side

C. scouring on convex side and on concave side

D. silting on convex side

23. If there are two canals taking off from each flank of a river, then there will be____________________?
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A. two divide walls and one undersluice

B. two divide walls and two undersluices

C. one divide wall and two undersluices

D. one divide wall and one undersluice

24. For supplying water to rabi crop, kharif crop and sugarcane, the channel is designed for a capacity equal to the greater of the water requirement of_______________?
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A. rabi or kharif

B. rabi and kharif or sugarcane

C. rabi and sugarcane or kharif and sugarcane

D. rabi or kharif or sugarcane

25. With the increase in the quantity of water supplied, the yield of most crops_________________?
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A. increases upto a certain limit and then decreases

B. increases upto a certain limit and then becomes constant

C. decreases continuously

D. increases continuously

26. Unit of runoff in M.K.S. system is________________?
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A. square metre

B. cubic metre

C. metre/sec

D. cubic metre/sec
27. In a chute spillway, the flow is usually____________________?
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A. uniform

B. super critical

C. critical

D. subcritical

28. If the R.Ls of canal bed level and high flood level of drainage are 212.0 m and 210.0 m respectively, then cross drainage work will be________________?
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A. superpassage

B. syphon

C. aqueduct

D. syphon aqueduct

29. A runoff river plant is____________?
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A. none of the above

B. a high head scheme

C. a low head scheme

D. a medium head scheme

30. In a Sarda type fall, rectangular crest is used for discharge upto______________?
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A. 14 cumecs

B. 6 cumecs

C. 10 cumecs

D. 20 cumecs

31. When the reservoir is full, the maximum compressive force in a gravity dam is produced______________?
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A. at the heel

B. at the toe

C. at centre of base

D. within the middle third of base

32. The most suitable chemical which can be applied to the water surface for reducing evaporation is________________?
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A. methyl alcohol

B. ethyl alcohol

C. butyl alcohol

D. cetyl alcohol
33. The outlet discharge factor is the duty at the head of_________________?
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A. watercourse

B. branch canal

C. distributory

D. main canal

34. Infiltration rate is always________________?
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A. less than the infiltration capacity

B. equal to or more than the infiltration capacity

C. more than the infiltration capacity

D. equal to or less than the infiltration capacity
35. A hyetograph is a graphical representation of___________________?
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A. cumulative rainfall and time

B. discharge and time

C. rainfall intensity and time

D. rainfall depth and time

36. Infiltration capacity_________________?
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A. is a constant factor

B. changes with time

C. changes with location

D. changes with both time and location
37. If D is the depth of scour below original bed, then the width of launching apron is generally taken as________________?
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A. 1.2 D

B. 2.0 D

C. 2.5 D

D. 1.5 D
38. Dimensions of coefficient of transmissibility are______________?
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A. MLT

B. MLV

C. M L2 T1

D. rvfLT1

39. The water utilizable by plants is available in soils mainly in the form of________________?
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A. chemical water

B. gravity water

C. capillary water

D. hydroscopic water

40. When the upstream face of a gravity dam is vertical, then the intensity of water pressure at the water surface and at the base respectively will be_______________?
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A. wH and 0

B. OandwII

C. 0 and wH212

D. wH2/2and wH2/3

41. Hydrodynamic pressure due to earthquake acts at a height of_________________?
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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_______________?
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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 ?
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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_____________?
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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________________?
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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