McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering .
| 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.) |
| A. | 0 and wH212 |
| B. | wH2/2and wH2/3 |
| C. | wH and 0 |
| D. | OandwII |
| Answer» D. OandwII | |
| 52. |
The uplift pressure on a dam can be controlled by
|
| A. | only (i) |
| B. | both (i) and (ii) |
| C. | both (i) and (iii) |
| D. | (i), (ii) and (iii) |
| Answer» D. (i), (ii) and (iii) | |
| 53. |
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» C. two-third of hydrostatic pressure at toe plus one-third of hydrostatic pressure at heel | |
| 54. |
Horizontal acceleration due to earthquake results in |
| A. | hydrodynamic pressure |
| B. | inertia force into the body of the dam |
| C. | both (a) and (b) |
| D. | none of the above |
| Answer» C. both (a) and (b) | |
| 55. |
Hydrodynamic pressure due to earthquake acts at a height of |
| A. | 3H/47I above the base |
| B. | 3H747t below the water surface |
| C. | 4H/371 above the base |
| D. | 4H737t below the water surface where H is the depth of water. |
| Answer» C. 4H/371 above the base | |
| 56. |
The major resisting force in a gravity dam is |
| A. | water pressure |
| B. | wave pressure |
| C. | self-weight of dam |
| D. | uplift pressure |
| Answer» C. self-weight of dam | |
| 57. |
When the reservoir is full, the maximum compressive force in a gravity dam is produced |
| A. | at the toe |
| B. | at the heel |
| C. | within the middle third of base |
| D. | at centre of base |
| Answer» A. at the toe | |
| 58. |
The maximum permissible eccentricity for no tension at the base of a gravity dam is |
| A. | B/2 |
| B. | B/3 |
| C. | B/4 |
| D. | B/6 |
| Answer» D. B/6 | |
| 59. |
Presence of tail water in a gravity dam
|
| A. | (i) and (iii) |
| B. | (i)and(iv) |
| C. | (ii) and (iii) |
| D. | (ii) and (iv) |
| Answer» 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.) |
| A. | 0.5 hw |
| B. | 0.75 hw |
| C. | 1.25 hw |
| D. | 1.50 hw |
| Answer» D. 1.50 hw | |
| 61. |
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» D. require less skilled labour | |
| 62. |
The most suitable material for the central impervious core of a zoned embankment type dam is |
| A. | clay |
| B. | coarse sand |
| C. | silty clay |
| D. | clay mixed with fine sand |
| Answer» D. clay mixed with fine sand | |
| 63. |
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» C. drain trenches | |
| 64. |
Seepage through foundation in an earthen dam is controlled by providing |
| A. | rock toe |
| B. | horizontal blanket |
| C. | impervious cut off |
| D. | chimney drain |
| Answer» C. impervious cut off | |
| 65. |
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» 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.) |
| A. | CLH3/2 |
| B. | CHL3/2 |
| C. | CLH5/2 |
| D. | CLH1/2 |
| Answer» A. CLH3/2 | |
| 67. |
Coefficient of discharge of an ogee spillway |
| A. | depends on depth of approach and upstream slope |
| B. | depends on downstream apron interference and downstream submergence |
| C. | remains constant |
| D. | both (a) and (b) |
| Answer» D. both (a) and (b) | |
| 68. |
Which of the following spillways is least suitable for an earthen dam ? |
| A. | ogee spillway |
| B. | chute spillway |
| C. | side channel spillway |
| D. | shaft spillway |
| Answer» A. ogee spillway | |
| 69. |
In case of non-availability of space due to topography, the most suitable spillway is |
| A. | straight drop spillway |
| B. | shaft spillway |
| C. | chute spillway |
| D. | ogee spillway |
| Answer» B. shaft spillway | |
| 70. |
In a chute spillway, the flow is usually |
| A. | uniform |
| B. | subcritical |
| C. | critical |
| D. | super critical |
| Answer» D. super critical | |
| 71. |
For the upstream face of an earthen dam, the most adverse condition for stability of slope is |
| A. | sudden drawdown |
| B. | steady seepage |
| C. | during construction |
| D. | sloughing of slope |
| Answer» A. sudden drawdown | |
| 72. |
If there are two canals taking off from each flank of a river, then there will be |
| A. | one divide wall and one undersluice |
| B. | one divide wall and two undersluices |
| C. | two divide walls and one undersluice |
| D. | two divide walls and two undersluices |
| Answer» 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 |
| A. | it ensures less length of the weir |
| B. | it gives better discharging capacity |
| C. | it is economical |
| D. | all of the above |
| Answer» D. all of the above | |
| 74. |
The main function of a divide wall is to |
| A. | control the silt entry in the canal |
| B. | prevent river floods from entering the canal |
| C. | separate the undersluices from weir proper |
| D. | provide smooth flow at sufficiently low velocity |
| Answer» C. separate the undersluices from weir proper | |
| 75. |
A divide wall is provided |
| A. | at right angle to the axis of weir |
| B. | parallel to the axis of weir and up-stream of it |
| C. | parallel to the axis of weir and down-stream of it |
| D. | at an inclination to the axis of weir |
| Answer» 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 |
| A. | lower level |
| B. | higher level |
| C. | same level |
| D. | any of the above depending on the design |
| Answer» A. lower level | |
| 77. |
Silt excluders are constructed on the |
| A. | river bed upstream of head regulator |
| B. | river bed downstream of head regulator |
| C. | canal bed upstream of head regulator |
| D. | canal bed downstream of head regulator |
| Answer» A. river bed upstream of head regulator | |
| 78. |
According to Khosla's theory, the exit gradient in the absence of a downstream cutoff is |
| A. | 0 |
| B. | unity |
| C. | infinity |
| D. | very large |
| Answer» 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 |
| A. | 4RS |
| B. | 11 RS |
| C. | 7RS |
| D. | 15 RS |
| Answer» 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 |
| A. | less than 1 |
| B. | equal to 1 |
| C. | greater than 1 |
| D. | equal to zero |
| Answer» 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 |
| A. | 0.5 xc |
| B. | 0.75 TC |
| C. | xc |
| D. | 1.33 TC |
| Answer» B. 0.75 TC | |
| 82. |
As per Lacey's theory, the silt factor is |
| A. | directly proportional to average par¬ticle size |
| B. | inversely proportional to average par¬ticle size |
| C. | directly proportional to square root of average particle size |
| D. | not related to average particle size |
| Answer» 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 |
| A. | 19 m |
| B. | 38m |
| C. | 57m |
| D. | 76m |
| Answer» B. 38m | |
| 84. |
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» C. canal escape | |
| 85. |
For a proportional outlet, the flexibility is |
| A. | zero |
| B. | between zero and 1 |
| C. | 1 |
| D. | greater than 1 |
| Answer» C. 1 | |
| 86. |
The sensitivity of a rigid module is |
| A. | zero |
| B. | between zero and one |
| C. | 1 |
| D. | infinity |
| Answer» A. zero | |
| 87. |
Which of the following is a flexible outlet ? |
| A. | submerged pipe outlet |
| B. | Kennedy's gauge outlet |
| C. | Gibb's outlet |
| D. | none of the above |
| Answer» B. Kennedy's gauge outlet | |
| 88. |
A straight glacis type fall with a baffle platform and a baffle wall is called |
| A. | vertical dropfall |
| B. | glacis fall |
| C. | Montague type fall |
| D. | inglis fall |
| Answer» D. inglis fall | |
| 89. |
Which of the following types of falls use parabolic glacis for energy dissipation ? |
| A. | vertical drop fall |
| B. | glacis fall |
| C. | Montague type fall |
| D. | inglis fall |
| Answer» C. Montague type fall | |
| 90. |
In a Sarda type fall, rectangular crest is used for discharge upto |
| A. | 6 cumecs |
| B. | 10 cumecs |
| C. | 14 cumecs |
| D. | 20 cumecs |
| Answer» C. 14 cumecs | |
| 91. |
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» A. vertical drop fall | |
| 92. |
Vertical drop fall is satisfactory for a height upto |
| A. | 0.5 m |
| B. | 1.5 m |
| C. | 3.5 m |
| D. | 5.0 m |
| Answer» B. 1.5 m | |
| 93. |
Which of the following canal outlets maintains a constant discharge ? |
| A. | non-modular outlet |
| B. | flexible outlet |
| C. | rigid module |
| D. | none of the above |
| Answer» 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 |
| A. | proportionality |
| B. | flexibility |
| C. | setting |
| D. | sensitivity |
| Answer» B. flexibility | |
| 95. |
The drainage water intercepting the canal can be disposed of by passing the canal below the drainage in |
| A. | aqueduct and syphon aqueduct |
| B. | aqueduct and super passage |
| C. | super passage and canal syphon |
| D. | level crossing |
| Answer» 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 |
| A. | aqueduct |
| B. | superpassage |
| C. | syphon |
| D. | syphon aqueduct |
| Answer» C. syphon | |
| 97. |
The aqueduct or superpassage type of works are generally used when |
| A. | high flood drainage discharge is small |
| B. | high flood drainage discharge is large and short lived |
| C. | high flood drainage discharge is large and continues for a long time |
| D. | none of the above |
| Answer» A. high flood drainage discharge is small | |
| 98. |
An aggrading river is a |
| A. | silting river |
| B. | scouring river |
| C. | both silting and scouring river |
| D. | neither silting nor scouring river |
| Answer» A. silting river | |
| 99. |
Tortuosity of a meandering river is the ratio of |
| A. | meander belt to meander length |
| B. | meander length to meander belt |
| C. | curved length along the channel to the direct axial length of the river reach |
| D. | direct axial length of the river reach to curved length along the channel |
| Answer» 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 |
| A. | average discharge |
| B. | dominant discharge |
| C. | maximum discharge |
| D. | critical discharge |
| Answer» B. dominant discharge | |
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