MCQOPTIONS
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MCQOPTIONS
This section includes 189 Mcqs, each offering curated multiple-choice questions to sharpen your Civil Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
The Lacey's regime velocity is proportional to |
| A. | loss of head follows the sine curve. |
| B. | R1/2 S3/4 |
| C. | Q3/4 S1/3 |
| D. | R3/4 S1/3 |
| Answer» D. R3/4 S1/3 | |
| 152. |
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» E. | |
| 153. |
While deciding the alignment of a proposed canal taking off from a river at B, three alignments of approximately equal lengths are available. These cross a drainages at C1, C2 and C3 where drainage bed levels C1 > C2 > C3, you will provide at site C3 |
| A. | an aqueduct |
| B. | a syphon aqueduct |
| C. | a super passage |
| D. | a syphon. |
| Answer» B. a syphon aqueduct | |
| 154. |
In a concrete canal the approximate permissible velocity of water should not exceed |
| A. | 0.5 m/sec |
| B. | 1 m/sec |
| C. | 1.5 m/sec |
| D. | 2 m/sec |
| Answer» E. | |
| 155. |
The field capacity of a soil is 25%, its permanent wilting point is 15% and specific dry unity weight is 1.5. If the depth of root zone of a crop, is 80 cm, the storage capacity of the soil, is |
| A. | 8 cm |
| B. | 10 cm |
| C. | 12 cm |
| D. | 14 cm |
| Answer» D. 14 cm | |
| 156. |
The level of the fioor of a syphon aqueduct can be obtained |
| A. | by subtracting the depth of the culvert from the canal bed level |
| B. | by subtracting the thickness of culvert plus the depth of the culvert from the canal bed level |
| C. | both (a) and (b) |
| D. | none of these. |
| Answer» C. both (a) and (b) | |
| 157. |
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» B. 1.074 | |
| 158. |
According to Khosla, the exist gradient of surface flow |
| A. | depends upon the b/d ratio |
| B. | is independent of the b/d ratio |
| C. | is independent of the depths of d/s cut off walls |
| D. | none of these. |
| Answer» B. is independent of the b/d ratio | |
| 159. |
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» C. x = d1 / r1 | |
| 160. |
Solution of Laplacian equation in three dimensions of water in a syphon, is done by |
| A. | analytical method |
| B. | Khosla's method |
| C. | method of relaxation |
| D. | Unwin's method. |
| Answer» D. Unwin's method. | |
| 161. |
Bligh's theory of seepage assumes |
| A. | equal weightage to the horizontal and vertical creep |
| B. | more weightage to horizontal creep than vertical creep |
| C. | less weightage to horizontal creep than vertical creep |
| D. | loss of head follows the sine curve. |
| Answer» B. more weightage to horizontal creep than vertical creep | |
| 162. |
Garnett's diagrams are used for graphical solution of design equations of a canal by |
| A. | Lacey's theory |
| B. | Kennedy's theory |
| C. | Gibb's theory |
| D. | Lindlay theory. |
| Answer» C. Gibb's theory | |
| 163. |
For standing crops in undulating sandy fields, the best method of irrigation, is |
| A. | sprinkler irrigation |
| B. | free flooding |
| C. | check method |
| D. | furrow method |
| Answer» B. free flooding | |
| 164. |
A current meter measures the velocity of flow, if it is held |
| A. | on the surface of water |
| B. | at the bottom of channel |
| C. | at any point within the cross-section |
| D. | none of these. |
| Answer» D. none of these. | |
| 165. |
An outlet which maintains a constant discharge irrespective of fluctuation in the water levels of the supplying channel or water course, is known as |
| A. | non-modular outlet |
| B. | semi-modular outlet |
| C. | flexible modular outlet |
| D. | right modular outlet. |
| Answer» E. | |
| 166. |
According to Lacey, depth of scour in a river depends upon the straightness of the reach. If D is the depth of scour in regime flow in a right angled bend, it is |
| A. | 1.25 D |
| B. | 1.50 D |
| C. | 1.75 D |
| D. | 2.00 D |
| Answer» E. | |
| 167. |
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. | aqueduct |
| D. | super-aqueduct |
| Answer» E. | |
| 168. |
The down stream 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» C. 60¬∞ | |
| 169. |
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» D. 40 cm | |
| 170. |
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 utilisation point |
| D. | none of these. |
| Answer» E. | |
| 171. |
If water table is comparatively high, the irrigation canal becomes useless, due to |
| A. | large amount of seepage |
| B. | water logging of the cultivated areas |
| C. | uncertain water demand |
| D. | spread of malaria |
| Answer» E. | |
| 172. |
For the design of major hydraulic structures on the canals, the method generally preferred to, is based on |
| A. | Bligh's theory |
| B. | Electrical analogy method |
| C. | The relaxation method |
| D. | Khosla's method of independent variables. |
| Answer» E. | |
| 173. |
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» D. canal passes over the drainage and H.F.L. of the drainage is below the bottom of the canal trough. | |
| 174. |
For smooth entry of water in a canal, the angle between head regulator and water is generally kept |
| A. | 80° |
| B. | 90° |
| C. | 110° |
| D. | 120° |
| Answer» D. 120¬∞ | |
| 175. |
Side slopes generally kept for canals in loam soil, are : |
| A. | 1 : 1 in cutting and : 1 in filling |
| B. | : 1 in cutting and 2 : 1 in filling |
| C. | Neither (a) nor (b) |
| D. | Both (a) and (b) |
| Answer» E. | |
| 176. |
For a given discharge in a channel, Blench curves give the relationship between the loss of head (HL) and |
| A. | specific energy up-stream |
| B. | specific energy down-stream |
| C. | critical depth of water down-stream |
| D. | depth of water down-stream |
| Answer» C. critical depth of water down-stream | |
| 177. |
The saturation line is the line up to which banks get saturated after the canal runs for some time. The saturation gradient in ordinary loam soil, is generally |
| A. | 0.084027777777778 |
| B. | 0.12569444444444 |
| C. | 0.16736111111111 |
| D. | 0.20902777777778 |
| Answer» D. 0.20902777777778 | |
| 178. |
Water-shed line is abondened for aligning an irrigation canal if |
| A. | water shed forms a sharp loop |
| B. | canal has to take off from a river |
| C. | towns and villages are located on the water shed line |
| D. | all the above. |
| Answer» E. | |
| 179. |
The depth of the crest of a scouring sluice below the crest of a head regulator, is generally kept |
| A. | 0.20 m |
| B. | 1.20 m |
| C. | 2.20 m |
| D. | 3.20 m |
| Answer» C. 2.20 m | |
| 180. |
For the conditions enumerated to provide a crossing at C1 You will probably provide |
| A. | an aqueduct |
| B. | a super-passage |
| C. | a syphon aqueduct |
| D. | none of these. |
| Answer» C. a syphon aqueduct | |
| 181. |
For loss of head in a canal inverted syphon barrel, the factor in the Unwin formula is a coefficient for loss of head due to |
| A. | friction |
| B. | exit |
| C. | entry |
| D. | gradient |
| Answer» D. gradient | |
| 182. |
When a canal flowing under pressure is carried below a natural drainage such that its F.S.L. does not touch the underside of the supporting structure, the structure so provided, is called |
| A. | syphon |
| B. | aqueduct |
| C. | super passage |
| D. | syphon-aqueduct. |
| Answer» D. syphon-aqueduct. | |
| 183. |
When a canal and a drainage approach each other at the same level, the structure so provided, is |
| A. | an aqueduct |
| B. | a syphon |
| C. | a level crossing |
| D. | inlet and outlet. |
| Answer» D. inlet and outlet. | |
| 184. |
For the stability of a structure against seepage pressure according to Khosla's creep theory, the critical gradient is |
| A. | zero |
| B. | 0.25 |
| C. | 0.5 |
| D. | 0.75 |
| Answer» E. | |
| 185. |
The discharge over a trapezoidal crest of a Sarda fall with free over fall conditions, is |
| A. | 0.45 2g . LH3/2 (H/B)1/3 |
| B. | 0.45 2g . LH2/3 (H/B)2/3 |
| C. | 0.45 2g . LH3/2 (H/B)1/6 |
| D. | 0.45 2g . LH1/6 (H/B)3/2 |
| Answer» D. 0.45 2g . LH1/6 (H/B)3/2 | |
| 186. |
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» C. reverse curve plus the width of the river | |
| 187. |
According to G.W. Pickles the effect of confining the flood water of a river between levee, is to increase |
| A. | rate of flood wave |
| B. | water surface elevation during floods |
| C. | maximum discharge |
| D. | velocity and scouring action |
| Answer» E. | |
| 188. |
If the straight sides of a triangular section of a lined canal with circular bottom of radius D, make an angle θ with horizontal, the hydraulic mean depth is |
| A. | D |
| B. | D/2 |
| C. | D/3 |
| D. | D/4 |
| Answer» C. D/3 | |
| 189. |
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» C. height of bank | |