civil engineering MCQs – Page 215

Practise multiple-choice questions from civil engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

civil engineering Mcqs
4281. 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_____________?
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A. (0.9)00

B. 1 (0.99)10

C. (0.99)10

D. l-(0.9)100

4282. The main cause of meandering is________________?
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A. degradation

B. the extra turbulence generated by the excess of river sediment during floods

C. presence of an excessive bed slope in the river

D. none of the above

4283. Which of the following is a flexible outlet ?
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A. Kennedys gauge outlet

B. submerged pipe outlet

C. none of the above

D. Gibbs outlet

4284. The stream which does not have any base flow contribution is called________________?
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A. none of the above

B. intermittent stream

C. ephemeral stream

D. perennial stream

4285. The forces, which are considered for the analysis of an elementary profile of a gravity dam under empty reservoir condition, are________________?
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A. Uplift

B. Water pressure

C. Pressure due to earthquake</strong>

D. correct answer is

E. Self weight

4286. Seepage through embankments in an earthen dam is controlled by_______________?
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A. provision of downstream berms

B. drainage filters

C. drain trenches

D. relief wells

4287. A river training work is generally required when the river is_______________?
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A. aggrading type

B. degrading type

C. meandering type

D. both (A) and (B)

4288. A current meter is used to measure the__________________?
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A. velocity of flow of water

B. depth of flow of water

C. discharge

D. none of the above

4289. Generally the weir is aligned at right angles to the direction of the main river current because______________?
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A. it is economical

B. all of the above

C. it ensures less length of the weir

D. it gives better discharging capacity

4290. Rate of evaporation from a water surface increases if_________________?
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A. correct answer is?

B. concentration of soluble solids in water is decreased</strong>

C. difference of vapour pressure between water and air is increased

D. velocity of wind is decreased

4291. Which of the following methods is used to estimate flood discharge based on high water marks left over in the past ?
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A. slope-area method

B. area-velocity method

C. ultra-sonic method

D. moving boat method

4292. Tortuosity of a meandering river is the ratio of__________________?
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A. meander belt to meander length

B. curved length along the channel to the direct axial length of the river reach

C. meander length to meander belt

D. direct axial length of the river reach to curved length along the channel

4293. Instantaneous unit hydrograph is a hydrograph of________________?
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A. correct answer is?

B. unit duration

C. unit rainfall excess

D. infinitely small rainfall excess</strong>

E. infinitely small duration

4294. Select the correct statement?
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A. A meander increases the river length but a cut off reduces the river length

B. A cutoff increases the river length but a meander reduces the river length

C. Both meander and cutoff increase the river length

D. Both meander and cutoff decrease the river length

4295. The maximum permissible eccentricity for no tension at the base of a gravity dam is__________________?
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A. B/6

B. B/3

C. B/4

D. B/2

4296. To determine the discharge at a section in a stream from its rating curve, the required data are_______________?
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A. stage at the section

B. correct answer is?

C. slope of water surface at the section

D. current meter readings at the section </strong>

4297. In case of non-availability of space due to topography, the most suitable spillway is________________?
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A. ogee spillway

B. chute spillway

C. shaft spillway

D. straight drop spillway

4298. Infiltration is the_______________?
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A. movement of water through the soil

B. absorption of water by soil surface

C. both (A) and (B)

D. none of the above

4299. The net speed under which the turbine reaches its peak efficiency is called_________________?
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A. operating speed

B. rated speed

C. gross speed

D. design speed
4300. Wetted perimeter of a regime channel for a discharge of 64 cumecs as per Laceys theory will be_________?
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A. 76m

B. 19 m

C. 57m

D. 38m