Irrigation Engineering MCQ
Civil Engineering MCQ
1. As compared to gravity dams, earthen dams
A. are costlier
B. are less susceptible to failure
C. require sound rock foundations
D. require less skilled labour
Answer: Option D
2. In gravity canals, F.S.L. is
A. Always at the ground level
B. Always below the ground level
C. Generally 4 to 5 meters above the ground level
D. Only a few cm above the ground level
Answer: Option D
3. The length of a meander is the distance along the river between the tangent point of one curve to the tangent point of
A. Reverse curve
B. Next curve of the same order
C. Reverse curve plus the width of the river
D. None of these
Answer: Option B
4. The state of the soil when plants fail to extract sufficient water for their requirements, is
A. Maximum saturated point
B. Permanent wilting point
C. Ultimate utilization point
D. None of these
Answer: Option D
5. The ratio of the average load to the installed capacity of the plant whose reserve capacity is zero will be equal to
A. Load factor
B. Plant factor
C. Utilization factor
D. Both (A) and (B)
Answer: Option D
Irrigation Engineering MCQ
6. The uplift pressure on the face of a drainage gallery in a dam is taken as
A. hydrostatic pressure at toe
B. average of hydrostatic pressure at toe and heel
C. two-third of hydrostatic pressure at toe plus one-third of hydrostatic pressure at heel
D. none of the above
Answer: Option C
7. A 70% index of wetness means
A. rain excess of 30%
B. rain deficiency of 30%
C. rain deficiency of 70%
D. none of the above
Answer: Option B
8. Seepage through embankments in an earthen dam is controlled by
A. drainage filters
B. relief wells
C. drain trenches
D. provision of downstream berms
Answer: Option C
9. The ratio of average values of shear stresses produced on the bed and the banks of a channel due to flowing water is
A. less than 1
B. equal to 1
C. greater than 1
D. equal to zero
Answer: Option C
10. The structure constructed to allow drainage water to flow under pressure through an inverted syphon below a canal, is called
A. Syphon
B. Super passage
C. Super-aqueduct
D. Syphon aqueduct
Answer: Option D
Irrigation Engineering MCQ
11. Canals constructed for draining off water from water logged areas, are known
A. Drains
B. Inundation canals
C. Valley canals
D. Contour canals
Answer: Option A
12. A river is said to be of
A. Aggrading type if it builds up its bed to a certain slope
B. Degrading type if it cuts its bed to a certain slope
C. Meandering type if it flows in sinuous curve
D. All the above
Answer: Option D
13. The main cause of meandering is
A. presence of an excessive bed slope in the river
B. degradation
C. the extra turbulence generated by the excess of river sediment during floods
D. none of the above
Answer: Option C
14. A multipurpose reservoir is the one which is
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
Answer: Option B
15. The uplift pressure on the roof of an inverted syphon, is maximum when
A. Drain in running dry
B. Canal is running dry
C. Canal is running with F.S.L.
D. Drain is running with H.F.L.
Answer: Option D
Irrigation Engineering MCQ
16. Which of the following canal structures is used to remove surplus water from an irrigation channel into a natural drain ?
A. canal fall
B. canal outlet
C. canal escape
D. canal regulator
Answer: Option C
17. The ratio of the discharge over a trapezoidal crest to a rectangular crest of Sarda falls of identical parameters, is
A. 1.084
B. 1.074
C. 1.064
D. 1.054
Answer: Option A
18. Which of the following can be used as a meter fall ?
A. vertical drop fall
B. flumed glacis fall
C. unflumed glacis fall
D. all of the above
Answer: Option A
19. 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
A. proportionality
B. flexibility
C. setting
D. sensitivity
Answer: Option B
20. A fall in a canal bed is generally provided, if
A. Ground slope exceeds the designed bed slope
B. Designed bed slope exceeds the ground slope
C. Ground slope is practically the same as the designed bed slope
D. None of these
Answer: Option A
Irrigation Engineering MCQ
21. The length and width of a meander and also the width of the river, vary roughly as
A. Square root of the discharge
B. Discharge
C. Square of the discharge
D. Cube of the discharge
Answer: Option A
22. For wave action in dams, the maximum height of freeboard is generally taken to be equal to (where hw is height of wave.)
A. 0.5 hw
B. 0.75 hw
C. 1.25 hw
D. 1.50 hw
Answer: Option D
23. The width of a meander belt is the transverse distance between
A. Apex point of one curve and apex point of the reserve curve
B. Apex point and the crossing
C. Two banks of meandering river
D. None of these
Answer: Option A
24. A minimum of 90 cm free board is provided if the discharge in the canal is between
A. 30 to 33 cumecs
B. 30 to 60 cumecs
C. Over 60 cumecs
D. Over 100 cumecs
Answer: Option C
25. For a unique design of a channel by Kennedy's theory
A. Its breadth must only be known
B. Its depth must only be known
C. Its breadth and depth ratio must only be known
D. All the above
Answer: Option C
Irrigation Engineering MCQ
26. In a syphon aqueduct
A. Drainage passes over the canal and F.S.L. of the canal is below the bottom of the drainage trough
B. Drainage passes over the canal and F.S.L. of the canal is above the bottom of the drainage trough
C. Canal passes over the drainage and H.F.L. of the drainage is above the bottom of the canal trough
D. Canal passes over the drainage and H.F.L. of the drainage is below the bottom of the canal trough
Answer: Option C
27. 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
A. T = kd
B. T = k/d
C. T= Vkd
D. k= VTd
Answer: Option A
28. If Δ is the depth of water in metres, B is the number of days of base period and D is the duty in hectare/cumec, the relationship which holds good, is
A. D = Δ (8.64 D/B)
B. B = Δ (8.64 B/D)
C. D = (8.6 Δ/B)
D. Δ = (8.6 B/D)
Answer: Option D
29. The sensitivity of a rigid module is
A. zero
B. between zero and one
C. 1
D. infinity
Answer: Option A
30. The consumptive use of water for a crop
A. Is measured as the volume of water per unit area
B. Is measured as depth of water on irrigated area
C. May be supplied partly by precipitation and partly by irrigation
D. All the above
Answer: Option D
Irrigation Engineering MCQ
31. Useful soil moisture for plant growth, is
A. Capillary water
B. Gravity water
C. Hygroscopic water
D. Chemical water
Answer: Option A
32. Trap efficiency of a reservoir is a function of
A. capacity/inflow ratio
B. capacity/outflow ratio
C. outflow/inflow ratio
D. none of the above
Answer: Option A
33. If the risk of a flood occurring in the next 10 years is accepted to 10%, then the return period for design should be
A. 1 + (0.9)010
B. 1 – (0.9)°l0
C. 1/(1-0.9°10)
D. 1/(1+ 0.9010)
Answer: Option C
34. The downstream expansion head of a guide bank is extended to subtend an angle at the centre, equal to
A. 30°
B. 45°
C. 60°
D. 90°
Answer: Option B
35. Finally formed berms in canals are provided for
A. Protection of banks erosion by the waves
B. Control of seepage losses
C. Strengthening of banks
D. All the above
Answer: Option D
Irrigation Engineering MCQ
36. The amount of irrigation water required to meet the evapotranspiration needs of the crop during its full growth is called
A. effective rainfall
B. consumptive use
C. consumptive irrigation requirement
D. net irrigation requirement
Answer: Option C
37. A 6 hours storm had 4 cm of rainfall and the resulting runoff was 2 cm. If Ï• index remains at the same value, the runoff due to 10 cm of rainfall in 12 hours in the catchment is
A. 4.5 cm
B. 6.0 cm
C. 7.5 cm
D. 9.0 cm
Answer: Option B
Solution:
Infiltration Rate =2/6=1/3cm/hr
Infiltration=1/3*12=4cm
Run-off= 10-4=6 cm
38. The width of a dowla is generally kept between 30 to 60 cm and its height above the road level should invariably be more than
A. 10 cm
B. 20 cm
C. 30 cm
D. 40 cm
Answer: Option C
39. The depth of water required to bring the soil moisture content of a given soil upto its field capacity is called
A. hygroscopic water
B. equivalent moisture
C. soil moisture deficiency
D. pellicular water
Answer: Option C
40. Borrow pits should preferably be located in
A. Field on the left side of the canal
B. Field on the right side of the canal
C. Fields on both sides of the canal
D. Central half width of the section of the canal
Answer: Option D
Irrigation Engineering MCQ
41. A counter berm is
A. A horizontal benching provided on the inside slope
B. A horizontal benching provided on the outside slope
C. A vertical benching provided on the outer edge of the bank
D. A vertical benching provided on the inner edge of the bank
Answer: Option B
42. Unit of runoff in M.K.S. system is
A. cubic metre/sec
B. metre/sec
C. cubic metre
D. square metre
Answer: Option A
43. V and R are the regime mean velocity and hydraulic mean depth respectively in meters. Lacey's silt factor f is
A. 2V²/√3 R
B. 3V²/4R
C. 5V²/2R
D. 2V²/5R
Answer: Option C
44. Pick up the incorrect statement from the following. Culturable commanded area is the gross area of an irrigation canal system less
A. Populated area
B. Alkaline area
C. Forest area
D. Fallow land
Answer: Option D
45. The useful moisture of soil, is equal to its
A. Field capacity
B. Saturation capacity
C. Moisture content at permanent wilting point
D. Difference between filed capacity and permanent wilting point within the root zone of plants
Answer: Option D
Irrigation Engineering MCQ
46. The kor depth for rice is 190 mm and kor period is 14 days. The outlet factor for this will be
A. 637 hectares/m3/sec
B. 837 hectares/m3/sec
C. 972 hectares/m3/sec
D. 1172 hectares/m3/sec
Answer: Option A
47. A hydroelectric scheme operating under a head of 80 m will be classified as
A. low head scheme
B. medium head scheme
C. high head scheme
D. none of the above
Answer: Option C
48. The intensity of irrigation means
A. Percentage of culturable commanded area to be irrigated annually
B. Percentage of gross commanded area to be irrigated annually
C. Percentage of the mean of culturable commanded area and the gross commanded area to be irrigated annually
D. Total depth of water supplied by the number of waterings
Answer: Option A
49. The water face of the guide banks, is protected by
A. One men stone pitching
B. Two man stone pitching
C. Three man stone pitching
D. Four man stone pitching
Answer: Option A
50. Bed bars in a canal are provided
A. To watch the general behavior of canal
B. To measure the discharge
C. To raise the supply level
D. To control the silting
Answer: Option A
Irrigation Engineering MCQ
51. Which of the following types of rain gauges is used for measuring rain in remote hilly inaccessible areas ?
A. tipping bucket type
B. weighing type
C. floating type
D. Simon’s raingauge
Answer: Option A
52. If d1 is the depth of cutting, d2 is the height of the bank from bed level r2 : 1 and r1 : 1 are the slopes in filling and cutting respectively, the horizontal distance n between the bed and bank, is
A. x = r1 d1
B. x = r2 d2
C. x = d1 / r1
D. x = d2 / r2
Answer: Option B
53. The uplift pressure on a dam can be controlled by
i) constructing cutoff under upstream face
ii) constructing drainage channels bet-ween the dam and its foundation
iii) by pressure grouting in foundation
The corret answer is
A. only (i)
B. both (i) and (ii)
C. both (i) and (iii)
D. (i), (ii) and (iii)
Answer: Option D
54. Under the same conditions, which of the following shapes of water surface will give the highest rate of evaporation ?
A. flat water surface
B. convex water surface
C. concave water surface
D. independent of shape of water surface
Answer: Option B
55. A deep well
A. is always deeper than a shallow well
B. has more discharge than a shallow well
C. is weaker structurally than a shallow well
D. both (A) and (B)
Answer: Option B
Irrigation Engineering MCQ
56. The most suitable section of a lined canal, is
A. Triangular section with circular bottom for small canals
B. Trapezoidal section with rounded corners for large canals
C. Both (A) and (B)
D. None of these
Answer: Option C
57. The value of Sodium Absorption Ratio for high sodium water lies between
A. 0 to 10
B. 10 to 18
C. 18 to 26
D. 26 to 34
Answer: Option C
58. Pick up the correct statement from the following:
A. Gravity water is harmful to crops
B. Hygroscopic water remains attached to soil molecules by chemical bond
C. Capillary moisture held in the soil pores against gravity by surface tension, is utilized by plants
D. All the above
Answer: Option C
59. Irrigation water having the concentration of Na++ , Ca++ and Mg++ as 20, 3 and 1 Milli equivalent per litre respectively will be classified as
A. low sodium water
B. medium sodium water
C. high sodium water
D. very high sodium water
Answer: Option B
60. The main function of a diversion head works of a canal from a river, is
A. To remove silt
B. To control floods
C. To store water
D. To raise water level
Answer: Option D
Irrigation Engineering MCQ
61. The flow of water after spilling over the weir crest in chute spillway and side channel spillway respectively are
A. At right angle and parallel to weir crest
B. Parallel and at right angle to weir crest
C. Parallel to weir crest in both
D. At right angle to weir crest in both
Answer: Option A
62. For an annual flood series arranged in descending order of magnitude, the return for a magnitude listed at position period m in a total data N is
A. N/(m+l)
B. m/(N+l)
C. m/N
D. (N+l)/m
Answer: Option D
63. A divide wall is provided
A. At right angle to the axis of weir
B. Parallel to the axis of weir and upstream of it
C. Parallel to the axis of weir and downstream of it
D. At an inclination to the axis of weir
Answer: Option A
64. If the irrigation efficiency is 80%, conveyance losses are 20% and the actual depth of watering is 16 cm, the depth of water required at the canal outlet, is
A. 10 cm
B. 15 cm
C. 20 cm
D. 25 cm
Answer: Option D
65. Wetted perimeter of a regime channel for a discharge of 64 cumecs as per Lacey’s theory will be
A. 19m
B. 38m
C. 57m
D. 76m
Answer: Option B
Irrigation Engineering MCQ
66. The difference in level between the top of a bank and supply level in a canal, is called
A. Berm
B. Free board
C. Height of bank
D. None of these
Answer: Option B
67. An artesian aquifer is the one where
A. water surface under the ground is at atmospheric pressure
B. water is under pressure between two impervious strata
C. water table serves as upper surface of zone of saturation
D. none of the above
Answer: Option B
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