1. Which of the following methods of applying water may be used on rolling land ?
Correct : A. boarder flooding
2. The value of Sodium Absorption Ratio for high sodium water lies between
Correct : C. 18 to 26
3. Optimum depth of kor watering for rice is
Correct : C. 190 mm
4. Irrigation water having the concentration of Na++ , Ca++ and Mg++ as 20, 3 and 1 Milli
equivalent per litre respectively will be classified as
Correct : B. medium sodium water
5. The duty is largest
Correct : B. on the field
6. The "outlet discharge factor" is the duty at the head of
Correct : C. watercourse
7. The kor depth for rice is 190 mm and kor period is 14 days. The outlet factor for this will be
Correct : A. 637 hectares/m3/sec
8. 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
Correct : C. rabi and sugarcane or kharif and sugarcane
9. 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
Correct : B. water application efficiency
10. The water utilizable by plants is available in soils mainly in the form of
Correct : B. capillary water
11. The amount of irrigation water required to meet the evapotranspiration needs of the crop
during its full growth is called
Correct : C. consumptive irrigation requirement
12. With the increase in the quantity of water supplied, the yield of most crops
Correct : D. increases upto a certain limit and then decreases
13. Hydrograph is the graphical representation of
Correct : A. runoff and time
14. Infiltration rate is always
Correct : C. equal to or less than the infiltration capacity
15. The depth of water required to bring the soil moisture content of a given soil upto its field
capacity is called
Correct : C. soil moisture deficiency
16. Infiltration capacity
Correct : D. changes with both time and location
17. Infiltration is the
Correct : A. movement of water through the soil
18. If the intensity of rainfall is more than the infiltration capacity of soil, then the infiltration
rate will be
Correct : B. equal to infiltration capacity
19. Cyclonic precipitation is caused by lifting of an air mass due to
Correct : A. pressure difference
20. Which of the following is a non-recording raingauge ?
Correct : B. Simon's raingauge
21. A raingauge should preferably be fixed
Correct : C. in an open space
22. Which of the following types of rain gauges is used for measuring rain in remote hilly
inaccessible areas ?
Correct : A. tipping bucket type
23. Rate of evaporation from a water surface increases if
i) difference of vapour pressure between water and air is increased
ii) velocity of wind is decreased
iii) concentration of soluble solids in water is decreased The correct answer is
Correct : B. (i) and (iii)
24. A 70% index of wetness means
Correct : B. rain deficiency of 30%
25. Under the same conditions, which of the following shapes of water surface will give the
highest rate of evaporation ?
Correct : B. convex water surface
26. 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 :
Correct : A. Both A and R are true and R is the correct explanation of A
27. When surface of transpiration is submerged under water, then potential evapotranspiration is
Correct : A. much more than evapotranspiration
28. Unit of runoff in M.K.S. system is
Correct : A. cubic metre/sec
29. The runoff increases with
Correct : A. increase in intensity of rain
30. The area between the isohyets 45 cm and 55 cm is 100 square km and between 55 cm and 65cm is 150 square km. The average depth of annua! precipitation over the above basin of 250 square km will be
Correct : C. 56 cm
31. A current meter is used to measure the
Correct : A. velocity of flow of water
32. 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
Correct : D. 60 minutes
33. 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
Correct : C. 90 mm
34. 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
Correct : A. 70mm
35. The best unit duration of storm for a unit hydrograph is
Correct : B. one-fourth of basin lag
36. The unit hydrograph due to a storm may be obtained by dividing the ordinates of the direct
runoff hydrograph by
Correct : A. direct runoff volume
37. The unit hydrograph of a specified duration can be used to evaluate the hydrograph of
storms of
Correct : D. any duration
38. S-hydrograph is used to obtain unit hydrograph of
Correct : C. both (a) and (b)
39. The relation between probability (P) and recurrence interval (T) is given by
Correct : A. PT = 1
40. Dimensions of coefficient of transmissibility are
Correct : C. M° L2 T1
41. 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
Correct : A. T = kd
42. An artesian aquifer is the one where
Correct : B. water is under pressure between two impervious strata
43. A deep well
Correct : B. has more discharge than a shallow well
44. A multipurpose reservoir is the one which is
Correct : B. planned and constructed to serve various purposes
45. The useful storage is the volume of water stored in the reservoir between
Correct : B. minimum pool level and normal pool level
46. The water stored in the reservoir below the minimum pool level is called
Correct : B. dead storage
47. For a flood control reservoir, the effective storage is equal to
Correct : D. useful storage + surcharge storage -valley storage
48. Trap efficiency of a reservoir is a function of
Correct : A. capacity/inflow ratio
49. 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
Correct : A. 50 years
50. The forces, which are considered for the analysis of an elementary profile of a gravity dam under empty reservoir condition, are
i) Water pressure
ii) Self weight
iii) Uplift
iv) Pressure due to earthquake
The correct answer is
Correct : A. Only (ii)
51. 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 (where w is unit weight of water and H is the depth of water.)
Correct : D. OandwII
52. 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
Correct : D. (i), (ii) and (iii)
53. The uplift pressure on the face of a drainage gallery in a dam is taken as
Correct : C. two-third of hydrostatic pressure at toe plus one-third of hydrostatic pressure at heel
54. Horizontal acceleration due to earthquake results in
Correct : C. both (a) and (b)
55. Hydrodynamic pressure due to earthquake acts at a height of
Correct : C. 4H/371 above the base
56. The major resisting force in a gravity dam is
Correct : C. self-weight of dam
57. When the reservoir is full, the maximum compressive force in a gravity dam is produced
Correct : A. at the toe
58. The maximum permissible eccentricity for no tension at the base of a gravity dam is
Correct : D. B/6
59. Presence of tail water in a gravity dam
i) increases the principal stress
ii) decreases the principal stress
iii) increases the shear stress
iv) decreases the shear stress
The correct answer is
Correct : D. (ii) and (iv)
60. For wave action in dams, the maximum height of freeboard is generally taken to be equal to (where hw is height of wave.)
Correct : D. 1.50 hw
61. As compared to gravity dams, earthen dams
Correct : D. require less skilled labour
62. The most suitable material for the central impervious core of a zoned embankment type
dam is
Correct : D. clay mixed with fine sand
63. Seepage through embankments in an earthen dam is controlled by
Correct : C. drain trenches
64. Seepage through foundation in an earthen dam is controlled by providing
Correct : C. impervious cut off
65. The flow of water after spilling over the weir crest in chute spillway and side channel
spillway respectively are
Correct : A. at right angle and parallel to weir crest
66. The discharge passing over an ogee spillway is given by (where, L is effective length of spillway crest and H is the total head over the spillway crest including velocity head.)
Correct : A. CLH3/2
67. Coefficient of discharge of an ogee spillway
Correct : D. both (a) and (b)
68. Which of the following spillways is least suitable for an earthen dam ?
Correct : A. ogee spillway
69. In case of non-availability of space due to topography, the most suitable spillway is
Correct : B. shaft spillway
70. In a chute spillway, the flow is usually
Correct : D. super critical
71. For the upstream face of an earthen dam, the most adverse condition for stability of slope is
Correct : A. sudden drawdown
72. If there are two canals taking off from each flank of a river, then there will be
Correct : D. two divide walls and two undersluices
73. Generally the weir is aligned at right angles to the direction of the main river current
because
Correct : D. all of the above
74. The main function of a divide wall is to
Correct : C. separate the undersluices from weir proper
75. A divide wall is provided
Correct : A. at right angle to the axis of weir
76. As compared to crest of the normal portion of the weir, the crest of the under sluice portion
of weir is kept at
Correct : A. lower level
77. Silt excluders are constructed on the
Correct : A. river bed upstream of head regulator
78. According to Khosla's theory, the exit gradient in the absence of a downstream cutoff is
Correct : C. infinity
79. 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
Correct : B. 11 RS
80. The ratio of average values of shear stresses produced on the bed and the banks of a channel
due to flowing water is
Correct : C. greater than 1
81. 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
Correct : B. 0.75 TC
82. As per Lacey's theory, the silt factor is
Correct : C. directly proportional to square root of average particle size
83. Wetted perimeter of a regime channel for a discharge of 64 cumecs as per Lacey's theory will be
Correct : B. 38m
84. Which of the following canal structures is used to remove surplus water from an irrigation
channel into a natural drain ?
Correct : C. canal escape
85. For a proportional outlet, the flexibility is
Correct : C. 1
86. The sensitivity of a rigid module is
Correct : A. zero
87. Which of the following is a flexible outlet ?
Correct : B. Kennedy's gauge outlet
88. A straight glacis type fall with a baffle platform and a baffle wall is called
Correct : D. inglis fall
89. Which of the following types of falls use parabolic glacis for energy dissipation ?
Correct : C. Montague type fall
90. In a Sarda type fall, rectangular crest is used for discharge upto
Correct : C. 14 cumecs
91. Which of the following can be used as a meter fall ?
Correct : A. vertical drop fall
92. Vertical drop fall is satisfactory for a height upto
Correct : B. 1.5 m
93. Which of the following canal outlets maintains a constant discharge ?
Correct : C. rigid module
94. 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
Correct : B. flexibility
95. The drainage water intercepting the canal can be disposed of by passing the canal below the
drainage in
Correct : C. super passage and canal syphon
96. If the R.L's 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
Correct : C. syphon
97. The aqueduct or superpassage type of works are generally used when
Correct : A. high flood drainage discharge is small
98. An aggrading river is a
Correct : A. silting river
99. Tortuosity of a meandering river is the ratio of
Correct : C. curved length along the channel to the direct axial length of the river reach
100. The meander pattern of a river is developed by