MCQOPTIONS
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MCQOPTIONS
This section includes 342 Mcqs, each offering curated multiple-choice questions to sharpen your Civil Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 301. |
If v1 and v2 are the velocities of flow before and after sudden enlargement in a pipe, the head loss given by Carnot and Borda equation, is |
| A. | (v22 - v12)/2g |
| B. | (v1 - v2)2/2g |
| C. | (v2 - v1)2/2g |
| D. | (v1 + v2)2/2g. |
| Answer» C. (v2 - v1)2/2g | |
| 302. |
A rectangular channel 6 m wide and 3 m deep and having a bed slope as 1 in 2000 is running full. If Chezy's constant C = 54.8, pick up the correct specification of the channel from the following : |
| A. | hydraulic mean depth = 1.5 m |
| B. | Velocity of flow = 1.5 m/sec |
| C. | Rate of flow = 27 m3/sec |
| D. | All the above. |
| Answer» E. | |
| 303. |
Reynold number is the ratio of initial force and |
| A. | viscosity |
| B. | elasticity |
| C. | gravitational force |
| D. | surface tension. |
| Answer» B. elasticity | |
| 304. |
A steady uniform flow is through |
| A. | a long pipe at decreasing rate |
| B. | a long pipe at constant rate |
| C. | an expanding tube at constant rate |
| D. | an expanding tube at increasing rate |
| Answer» C. an expanding tube at constant rate | |
| 305. |
The flow in open channel is said to be subcritical if the Froude number is |
| A. | less than 1.0 |
| B. | equal to 1.0 |
| C. | greater than 1.0 |
| D. | none. |
| Answer» B. equal to 1.0 | |
| 306. |
Highest dam in India, is |
| A. | Bhakra dam |
| B. | Hirakund dam |
| C. | Nagarjuna Sagar dam |
| D. | Iddiki dam. |
| Answer» B. Hirakund dam | |
| 307. |
The instrument used for measuring the velocity of flow, is known as |
| A. | venturimeter |
| B. | orifice meter |
| C. | pitot tube |
| D. | none of these. |
| Answer» D. none of these. | |
| 308. |
The shear stress distribution in viscous fluid through a circular pipe is : |
| A. | maximum at the centre |
| B. | maximum at the inside of surface |
| C. | same throughout the section |
| D. | none of these. |
| Answer» D. none of these. | |
| 309. |
Discharge over an ogee weir remains the same as that of |
| A. | sharp crested weir |
| B. | triangular weir |
| C. | cippoletti weir |
| D. | drowned weir. |
| Answer» D. drowned weir. | |
| 310. |
When two layers of a fluid separated by dy move over the other with a difference of velocity dv, causes a shearing stress , where μ is known as |
| A. | coefficient of viscosity |
| B. | absolute viscosity |
| C. | dynamic viscosity |
| D. | viscosity |
| Answer» E. | |
| 311. |
Discharge with velocity of approach, over a rectangular weir is |
| A. | Cd x L x 2g [(H + ha)3/2 + ha3/2] |
| B. | Cd x L x 2g [(H + ha)3/2 - ha3/2] |
| C. | Cd x L x 2g [(H - ha)3/2 + ha3/2] |
| D. | Cd x L x 2g [(H - ha)3/2 - ha3/2] |
| Answer» C. Cd x L x 2g [(H - ha)3/2 + ha3/2] | |
| 312. |
A syphon is used |
| A. | to connect water reservoirs at different levels intervened by a hill |
| B. | to supply water to a town from higher level to lower level |
| C. | to fill up a tank with water at higher level from a lower level |
| D. | none of these. |
| Answer» B. to supply water to a town from higher level to lower level | |
| 313. |
In steady flow, which one of the following changes with time |
| A. | velocity |
| B. | pressure |
| C. | density |
| D. | none of these. |
| Answer» E. | |
| 314. |
Most economical section of a triangular channel, is |
| A. | equilateral triangle |
| B. | right angled triangle |
| C. | isosceles triangle with 45° vertex angle |
| D. | right angled triangle with equal sides. |
| Answer» E. | |
| 315. |
The momentum correction factor (β) for the viscous flow through a circular pipe is |
| A. | 1.25 |
| B. | 1.33 |
| C. | 1.5 |
| D. | 1.66 |
| Answer» C. 1.5 | |
| 316. |
A cylindrical vessel 40 cm high is revolved about its vertical axis so that the water touches the bottom when it just spills out. If the radius of the cylinder is 5 cm, the angular velocity of rotation, is |
| A. | 2 rad/sec |
| B. | 3 rad/sec |
| C. | 4 rad/sec |
| D. | 5 rad/sec |
| Answer» B. 3 rad/sec | |
| 317. |
The velocity of flow at the critical depth (hc) is called critical velocity (Vc) which is equal to |
| A. | Vc = g x hc |
| B. | g x hc |
| C. | |
| Answer» C. | |
| 318. |
The pressure less than atmospheric , pressure, is known |
| A. | suction pressure |
| B. | vacuum pressure |
| C. | negative gauge pressure |
| D. | all the above. |
| Answer» E. | |
| 319. |
The ratio of the percentagge error in the discharge and percentage error in the measurement of head over a triangular notch, is |
| A. | 43526 |
| B. | 43499 |
| C. | 43587 |
| D. | 43501 |
| Answer» E. | |
| 320. |
The side slope of Cipolletti weir is generally kept |
| A. | 1 to 4 |
| B. | 1 to 3 |
| C. | 1 to 2 |
| D. | 0.045138888888889 |
| Answer» B. 1 to 3 | |
| 321. |
One metric slug is equal to |
| A. | 1 kg wt |
| B. | 9.81 kg wt |
| C. | 9.81 kg mass |
| D. | 0.98 kg wt. |
| Answer» D. 0.98 kg wt. | |
| 322. |
The specific weight of water is 1000 kg/m3 |
| A. | at normal pressure of 760 mm |
| B. | at 4°C temperature |
| C. | at mean sea level |
| D. | all the above. |
| Answer» E. | |
| 323. |
The time required to close a valve gradually is (where L is the length of pipe and C = velocity of pressure wave) |
| A. | |
| B. | ≤ |
| C. | > |
| Answer» D. | |
| 324. |
Flow in pipes is laminar if Reynold number is |
| A. | less than 2100 |
| B. | more than 3000 |
| C. | between 2100 and 3000 |
| D. | none of these. |
| Answer» B. more than 3000 | |
| 325. |
Equation of continuity of flow is based on the principle of conservation of |
| A. | mass |
| B. | momentum |
| C. | force |
| D. | none of these. |
| Answer» B. momentum | |
| 326. |
The property of steam function ψ is : |
| A. | ψ is constant everwhere on any stream line |
| B. | the flow around any path in the fluid is zero for continuous flow |
| C. | the rate of change of ψ with distance in an arbitrary direction, is proportional to the component of velocity normal to that direction |
| D. | the velocity vector may be found by differentiating the stream function |
| Answer» E. | |
| 327. |
The total pressure force on a plane area is equal to the area multiplied by the intensity of pressure at its centroid, if |
| A. | area is horizontal |
| B. | area is vertical |
| C. | area is inclined |
| D. | all the above. |
| Answer» E. | |
| 328. |
Water flows through a convergent mouthpiece of diameter 4 cm at convergence under a head of 3 metres. If the maximum vacuum pressure is 9 metres of water, the maximum diameter of divergence, to aviod separation of flow, is |
| A. | 4 cm |
| B. | 6 cm |
| C. | 2 cm |
| D. | 23 cm. |
| Answer» D. 23 cm. | |
| 329. |
While applying the Bernoulli's equation = total head, the work any section done on the flow system, if any |
| A. | is added on the right side of the equation |
| B. | is added on the left side of the equation |
| C. | is ignored |
| D. | none of these. |
| Answer» C. is ignored | |
| 330. |
The thickness of a sharp crested weir is kept less than |
| A. | one-third of the height of water on the sill |
| B. | one-half of the height of water on the sill |
| C. | one-fourth of the height of water on the sill |
| D. | two-third of the height of water on the sill |
| Answer» C. one-fourth of the height of water on the sill | |
| 331. |
A cylinder 3 m in diameter and 4 m long retains water one side as shown in the below figure. If the weight of the cylinder is 2000 kgf, the horizontal reaction at B is |
| A. | 10,000 kgf |
| B. | 15,000 kgf |
| C. | 20,000 kgf |
| D. | 18,000 kgf. |
| Answer» E. | |
| 332. |
The horizontal component of the force on a curved surface is equal to |
| A. | weight of liquid vertically below the curved surface |
| B. | force on a vetical projection of the curved surface |
| C. | product of pressure at its centroid and the area |
| D. | weight of liquid retained by the curved area. |
| Answer» C. product of pressure at its centroid and the area | |
| 333. |
For exerting a pressure of 4.8 kg/cm2, the depth of oil (specific gravity 0.8), should be |
| A. | 40 cm |
| B. | 41 cm |
| C. | 56 cm |
| D. | 60 cm |
| Answer» E. | |
| 334. |
If the atmospheric pressure on the surface of an oil tank (sp. gr. 0.8) is 0.1 kg/cm2, the pressure at a depth of 2.5 m, is |
| A. | 1 metre of water |
| B. | 2 metres of water |
| C. | 3 metres of water |
| D. | 3.5 metres of water |
| Answer» D. 3.5 metres of water | |
| 335. |
The maximum vacuum created at the summit of a syphon is |
| A. | 2.7 m of water |
| B. | 7.4 m of water |
| C. | 5.5 m of water |
| D. | none. |
| Answer» C. 5.5 m of water | |
| 336. |
The ratio of maximum velocity to average velocity of viscous fluid through a circular pipe is |
| A. | 0.5 |
| B. | 0.75 |
| C. | 1.25 |
| D. | 2 |
| Answer» E. | |
| 337. |
When a body is totally or partially immersed in a fluid, it is buoyed up by a force equal to |
| A. | weight of the body |
| B. | weight of the fluid displaced by the body |
| C. | weight of the body and fluild displaced by the body |
| D. | difference of weights of the fluid displaced and that of the body |
| Answer» C. weight of the body and fluild displaced by the body | |
| 338. |
In flowing liquids pitot tubes are used measure |
| A. | discharge |
| B. | pressure |
| C. | velocity |
| D. | depth. |
| Answer» D. depth. | |
| 339. |
Pick up the correct statement regarding Borda's mouth piece running full from the following : |
| A. | Actual velocity at the out let is gH |
| B. | Theoretical velocity at the outlet is 2gH |
| C. | Coefficient of velocity is 1/2 |
| D. | Coefficient of contraction is 1 |
| Answer» E. | |
| 340. |
Most economical section of a circular channel for maximum discharge |
| A. | depth of water = 0.95 diameter of circular section |
| B. | hydraulic mean depth = 0.286 diameter of circular section |
| C. | wetted perimeter = 2.6 diameter of circular section |
| D. | wetted perimeter = 2.83 depth of water |
| Answer» E. | |
| 341. |
A pipe of 0.1 m2 cross sectional area suddenly enlarges to 0.3 m2 cross-sectional area. If the discharge of the pipe is 0.3 m3 /sec, the head loss is |
| A. | 2/g m of water |
| B. | g/2 m of water |
| C. | 1g m of water |
| D. | g m of water. |
| Answer» B. g/2 m of water | |
| 342. |
A pitot tube is used to measure |
| A. | pressure |
| B. | difference in pressure |
| C. | velocity of flow |
| D. | none of these. |
| Answer» D. none of these. | |