Correct : C. the extra turbulence generated by the excess of river sediment during floods
2. Tortuosity of a meandering river is always
Correct : C. greater than 1
3. Select the correct statement.
Correct : A. A meander increases the river length but a cut off reduces the river length.
4. River training for depth is achieved by
Correct : D. groynes and bandalling
5. Main purpose of mean water training for rivers is
Correct : C. to preserve the channel in good shape by efficient disposal of suspended and bed load
6. If D is the depth of scour below original bed, then the width of launching apron is
generally taken as
Correct : B. 1.5 D
7. Study the following statements.
i) Levees are constructed parallel to river flow,
ii) Spurs are constructed parallel to river flow,
iii) Levees are constructed transverse to river flow,
iv) Spurs are constructed transverse to river flow.
The correct answer is
Correct : B. (i) and (iv)
8. A repelling groyne is aligned
Correct : A. pointing upstream
9. A river training work is generally required when the river is
Correct : C. meandering type
10. A river bend characterized by silting
Correct : D. scouring on concave side and silting on convex side
11. Select the incorrect statement.
Correct : C. Lift irrigation increases water logging.
12. A land is known as waterlogged
Correct : C. capillary fringe reaches the root zone of plants
13. Lining of irrigation channels
Correct : B. decreases the waterlogging area
14. A runoff river plant is
Correct : A. a low head scheme
15. The net speed under which the turbine reaches its peak efficiency is called
Correct : A. design speed
16. A runoff river plant
Correct : C. is suitable only on a perennial river
17. The net head under which the turbine reaches its peak efficiency at synchronous speed is
called
Correct : A. design head
18. The ratio of the average load to the installed capacity of the plant whose reserve capacity is
zero will be equal to
Correct : D. both (a) and (b)
19. A hydroelectric scheme operating under a head of 80 m will be classified as
Correct : C. high head scheme
20. A hyetograph is a graphical representation of
Correct : A. rainfall intensity and time
21. Variability of rainfall is
i) largest in regions of high rainfall
ii) largest in coastal areas
iii) largest in regions of scanty rainfall
The correct answer is
Correct : C. only (iii)
22. In India, which of the following is adopted as standard recording raingauge ?
Correct : C. natural syphon type
23. 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
Correct : B. more than 100 mm
24. The maximum rainfall depth of 300 mm in 24 hours has a return period of 100 years. The probability of 24 hours rainfall equal to or greater than 300 mm occurring at least once in 10 years is given by
Correct : B. 1 - (0.99)10
25. The most suitable chemical which can be applied to the water surface for reducing
evaporation is
Correct : C. cetyl alcohol
26. Interception losses are due to
i) evaporation
ii) transpiration
iii) stream flow
The correct answer is
Correct : A. only (i)
27. 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
Correct : B. 6.0 cm
28. Which of the following methods is used to estimate flood discharge based on high water marks left over in the past ?
Correct : A. slope-area method
29. To determine the discharge at a section in a stream from its rating curve, the required data are
i) slope of water surface at the section
ii) stage at the section
iii) current meter readings at the section The correct answer is
Correct : C. only (ii)
30. 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)willbe
Correct : C. 2 Q m3/sec
31. The stream which does not have any base flow contribution is called
Correct : C. ephemeral stream
32. The flow-mass curve is graphical representation of
Correct : C. cumulative discharge, volume and time in chronological order
33. If the demand line drawn from a ridge in a flow mass curve does not intersect the curve again, it indicates that
Correct : A. demand cannot be met by inflow
34. The shape of recession limb of a hydrograph depends upon
Correct : A. basin characteristics only
35. Instantaneous unit hydrograph is a hydrograph of
i) unit duration
ii) unit rainfall excess
iii) infinitely small duration
iv) infinitely small rainfall excess
The correct answer is
Correct : C. (ii) and (iii)
36. For a catchment area of 120 km2, the equilibrium discharge in m3/hour of an S-curve obtained by the summation of 6 hour unit hydro graph is
Correct : A. 0.2 x 106
37. A unit hydro graph has one unit of
Correct : B. rainfall excess
38. The peak of a 4 hour flood hydrograph is 240 m3/sec . If the rainfall excess is 80 mm and base flow which is constant is 40 m3/sec, then the peak of 4-hours unit hydrograph will be
Correct : B. 25 m3/sec
39. To estimate the magnitude of a flood with a return period of T years, Gumbel's distribution method requires the following data pertaining to annual flood series
i) mean value
ii) standard deviation
iii) length of record
iv) coefficient of skew
The correct answer is
Correct : B. (i),(ii) and (iii)
40. 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
Correct : D. (N+l)/m
41. If the risk of a flood occurring in the next 10 years is accepted to 10%, then the return period for design should be
Correct : C. 1/(1-0.9°10)
42. The crest level in a barrage is kept at a
Correct : A. low
43. When the full supply level (F.S.L.) of the canal is much below the bed level of the drainage trough, then the cross drainage provided is called syphon aqueduct.
Correct : B. No
44. A spoil bank is formed when the
Correct : C. volume of excavation is in excess of the embankment filling
45. When the drain is over the canal, the structure provided is known as
Correct : B. super-passage
46. A levee on flood
Correct : D. all of the above
47. The primary cause of meandering is the excess of total charge during floods, when excess of turbulence is developed.
Correct : A. True
48. In order to estimate the high flood discharge in fan-shaped catchment, the formula used is
Correct : C. Inglis formula
49. The capacity of escape channel should not be less than
Correct : D. 50%
50. The whole period of cultivation from the time when irrigation water is first supplied for preparation of the ground to its last watering before harvesting, is called
Correct : A. base period
51. A baffle wall is a sort of low weir constructed at the end of the cistern to
Correct : C. both (a) and (b)
52. The function of a barrage is different to that a weir.
Correct : B. Incorrect
53. The irrigation engineering may be defined as
Correct : D. all of the above
54. Liquid precipitation consists of
Correct : D. rainfall
55. The main cause of silting in channel is
Correct : D. all of these
56. Lacey's theory as applied to channel design, involves trial and error procedure.
Correct : B. Disagree
57. The ratio between the area of a crop irrigated and the quantity of water required during its entire period of the growth, is known as
Correct : B. duty
58. The loss of head per unit length of creep is called
Correct : B. percolation coefficient
59. The basic factor which controls the process of meandering is
Correct : D. all of these
60. In a flexible outlet, the discharge depends upon the
Correct : A. water level in distributary
61. A river meandering through an alluvial plain has a series of consecutive curves of reversed order connected with short straight sketches, is called
Correct : A. crossing
62. The water shed canal is also called
Correct : C. ridge canal
63. In an Inglis type fall, the baffle holds the jump stable on a horizontal platform.
Correct : A. Agree
64. The borrow pits should, preferably, be taken from
Correct : C. the central half width of the section of the canal
65. Rivers on alluvial plains may be
Correct : D. all of these
66. A canal sligned nearly parallel to the contours of a country, is known as
Correct : B. contour canal
67. The duty at outlet is called capacity factor.
Correct : B. Incorrect
68. The duty is largest
Correct : C. on the field
69. The knowledge of hydrology is necessary in civil engineering for
Correct : D. all of these
70. Nawab Jang Bahadur formula is used to estimate the flood discharge of American catchments
Correct : B. Wrong
71. For closed growing crops (such as wheat), the method of irrigation used is
Correct : B. border flooding
72. The crest of the under-sluices should be lower than the crest of the head regulator (if silt excluder is provided by at least
Correct : B. 1.8 to 2 m
73. In Bligh's creep theory, it is assumed that the percolation water creep
Correct : A. along the contact of the base profile of the apron with the sub-soil
74. When the irrigation canal and the drain are at the same level, then the cross drainage work is achieved by providing a
Correct : C. level crossing
75. The amount of precipitation is measured by
Correct : A. rain gauge
76. Distributary head regulators are provided
Correct : D. all of the above
77. Which of the following is a type of semi-module outlet?
Correct : C. Kennedy's gauge outlet
78. The opening in the weir wall with a crest at low level on the canal side is known as under sluice or scouring sluice.
Correct : A. Correct
79. The optimum depth of kor watering for wheat in the plains of north India is
Correct : A. 13.5 cm
80. The flexibility of a hyper-proportional outlet is
Correct : A. greater than
81. In a proportional outlet, the rate of change of its discharge is
Correct : A. equal to
82. A weir fails due to
Correct : D. all of the above
83. The average delta of rice crop is nearly
Correct : C. 120 cm
84. The science which deals with the physical features and conditions of water on the earth surface is called
Correct : B. hydrography
85. A groyne with a curved head is known as
Correct : A. hockey groyne
86. The slope of a canal, for a discharge of 300 cumecs, should be
Correct : C. 1 in 8000
87. The precipitation caused by natural rising of warmer lighter air in colder and denser surroundings, is called
Correct : A. convective precipitation
88. The sensitivity of a rigid module is
Correct : A. equal to zero
89. The Sarda canal has a
Correct : B. vertical drop fall
90. When discharge of an outlet is independent of the water levels in the water course and the distributary, the outlet is termed as a
Correct : D. rigid module
91. For low navigation dams, the type of gate used is
Correct : B. bear trap gate
92. The coefficient of creep is the reciprocal of percolation coefficient.
Correct : A. Right
93. Cross regulators are provided
Correct : D. all of the above
94. The commonly used rain gauge is
Correct : C. float type
95. Which of the following statement is wrong?
Correct : D. none of the above
96. The sensitivity of an outlet is defined as the ratio of the
Correct : B. rate of change of discharge of an outlet to the rate of change in level of the distributing surface, referred to normal depth of the channel
97. Crop ratio is the ratio of area irrigated
Correct : B. in Kharif season to Rabi season
98. The depth of root zone is 90 cm for
Correct : C. rice
99. A parabolic glacis type fall is commonly known as
Correct : A. Montague fall
100. For Madras catchments, the flood discharge is estimated from Q = CA2/3. This formula is known as