McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering .
| 301. |
Whenever a plate is held immersed at some angle with the direction of flow of the liquid, it is subjected to some pressure. The component of this pressure, in the direction of flow of the liquid, is known as |
| A. | Lift |
| B. | Drag |
| C. | Stagnation pressure |
| D. | Bulk modulus |
| Answer» B. Drag | |
| 302. |
Which of the following is dimensionless? |
| A. | Specific weight |
| B. | Specific volume |
| C. | Specific speed |
| D. | Specific gravity |
| Answer» D. Specific gravity | |
| 303. |
Coefficient of resistance is the ratio of |
| A. | Actual velocity of jet at vena -contracta to the theoretical velocity |
| B. | Area of jet at vena-contracta to the area of orifice |
| C. | Loss of head in the orifice to the head of water available at the exit of the orifice |
| D. | Actual discharge through an orifice to the theoretical discharge |
| Answer» C. Loss of head in the orifice to the head of water available at the exit of the orifice | |
| 304. |
Mercury does not wet glass. This is due to property of liquid known as |
| A. | Adhesion |
| B. | Cohesion |
| C. | Surface tension |
| D. | Viscosity |
| Answer» C. Surface tension | |
| 305. |
A flow in which __________ force is dominating over the viscosity is called turbulent flow. |
| A. | Elastic |
| B. | Surface tension |
| C. | Viscous |
| D. | Inertia |
| Answer» D. Inertia | |
| 306. |
Specific weight of sea water is more that of pure water because it contains |
| A. | Dissolved air |
| B. | Dissolved salt |
| C. | Suspended matter |
| D. | All of the above |
| Answer» D. All of the above | |
| 307. |
In an internal mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to height of the liquid above the vena contracta. |
| A. | Less than |
| B. | More than |
| C. | Equal to |
| D. | None of these |
| Answer» A. Less than | |
| 308. |
An odd shaped body weighing 7.5 kg and occupying 0.01 m3 volume will be completely submerged in a fluid having specific gravity of |
| A. | 1 |
| B. | 1.2 |
| C. | 0.8 |
| D. | 0.75 |
| Answer» D. 0.75 | |
| 309. |
The factional resistance of a pipe varies approximately with __________ of the liquid. |
| A. | Pressure |
| B. | Velocity |
| C. | Square of velocity |
| D. | Cube of velocity |
| Answer» C. Square of velocity | |
| 310. |
For measuring flow by a Venturimeter, if should be installed in |
| A. | Vertical line |
| B. | Horizontal line |
| C. | Inclined line with flow downward |
| D. | In any direction and in any location |
| Answer» D. In any direction and in any location | |
| 311. |
The ratio of the inertia force to the elastic force is called |
| A. | Reynold's number |
| B. | Froude's number |
| C. | Weber's number |
| D. | Mach number |
| Answer» D. Mach number | |
| 312. |
All the terms of energy in Bernoulli's equation have dimension of |
| A. | Energy |
| B. | Work |
| C. | Mass |
| D. | Length |
| Answer» D. Length | |
| 313. |
The pressure at a point 4 m below the free surface of water is |
| A. | 19.24 kPa |
| B. | 29.24 kPa |
| C. | 39.24 kPa |
| D. | 49.24 kPa |
| Answer» C. 39.24 kPa | |
| 314. |
Specific weight of water in S.I. units is equal to |
| A. | 1000 N/m 3 |
| B. | 10000 N/m3 |
| C. | 9.81 × 103 N/m3 |
| D. | m3 |
| Answer» C. 9.81 × 103 N/m3 | |
| 315. |
In an external mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to 0.89 times the height of the liquid, above the vena contracta. |
| A. | Less than |
| B. | More than |
| C. | Equal to |
| D. | None of these |
| Answer» A. Less than | |
| 316. |
Poise is the unit of |
| A. | Surface tension |
| B. | Capillarity |
| C. | Viscosity |
| D. | Shear stress in fluids |
| Answer» C. Viscosity | |
| 317. |
Viscous force is the __________ of shear stress due to viscosity and cross-section area of flow. |
| A. | Sum |
| B. | Different |
| C. | Product |
| D. | Ratio |
| Answer» C. Product | |
| 318. |
The siphon will work satisfactorily, if the minimum pressure in the pipe is __________ vapour pressure of liquid. |
| A. | Equal to |
| B. | Less than |
| C. | More than |
| D. | None of these |
| Answer» C. More than | |
| 319. |
The tangential velocity of the water element having a free vortex is |
| A. | Directly proportional to its distance from the centre |
| B. | Inversely proportional to its distance from the centre |
| C. | Directly proportional to its (distance) 2 from the centre |
| D. | Inversely proportional to its (distance) 2 from the centre |
| Answer» B. Inversely proportional to its distance from the centre | |
| 320. |
The horizontal component of buoyant force is |
| A. | Negligible |
| B. | Same as buoyant force |
| C. | Zero |
| D. | None of the above |
| Answer» C. Zero | |
| 321. |
A flow in which the quantity of liquid flowing per second is constant, is called __________ flow. |
| A. | Steady |
| B. | Streamline |
| C. | Turbulent |
| D. | Unsteady |
| Answer» A. Steady | |
| 322. |
The divergent portion of a Venturimeter is made longer than convergent portion in order to |
| A. | Avoid the tendency of breaking away the stream of liquid |
| B. | To minimise frictional losses |
| C. | Both (A) and (B) |
| D. | None of these |
| Answer» C. Both (A) and (B) | |
| 323. |
According to Chezy's formula, the discharge through an open channel is (where A = Area of flow, C = Chezy's constant, m = Hydraulic mean depth, and i = Uniform slope in bed) |
| A. | A × m × i) |
| B. | C × m × i) |
| C. | AC × m × i) |
| D. | mi × A × C) |
| Answer» C. AC × m × i) | |
| 324. |
In a free vortex motion, the radial component of velocity everywhere is |
| A. | Maximum |
| B. | Minimum |
| C. | Zero |
| D. | Nonzero and finite |
| Answer» C. Zero | |
| 325. |
Coefficient of contraction is the ratio of |
| A. | Actual velocity of jet at vena contracta to the theoretical velocity |
| B. | Loss of head in the orifice to the head of water available at the exit of the orifice |
| C. | Loss of head in the orifice to the head of water available at the exit of the orifice |
| D. | Area of jet at vena-contracta to the area of orifice |
| Answer» D. Area of jet at vena-contracta to the area of orifice | |
| 326. |
The Bernoulli's equation is based on the assumption that |
| A. | There is no loss of energy of the liquid flowing |
| B. | The velocity of flow is uniform across any cross-section of the pipe |
| C. | No force except gravity acts on the fluid |
| D. | All of the above |
| Answer» D. All of the above | |
| 327. |
The flow in a pipe is turbulent when Reynold number is |
| A. | Less than 2000 |
| B. | Between 2000 and 2800 |
| C. | More than 2800 |
| D. | None of these |
| Answer» C. More than 2800 | |
| 328. |
When the flow parameters at any given instant remain same at every point, then flow is said to be |
| A. | Quasi-static |
| B. | Steady state |
| C. | Laminar |
| D. | Uniform |
| Answer» D. Uniform | |
| 329. |
Rain drops are spherical because of |
| A. | Viscosity |
| B. | Air resistance |
| C. | Surface tension forces |
| D. | Atmospheric pressure |
| Answer» C. Surface tension forces | |
| 330. |
The discharge over the trapezoidal notch is equal to the discharge over the rectangular notch __________ the discharge over the triangular notch. |
| A. | Plus |
| B. | Minus |
| C. | Divide |
| D. | None of these |
| Answer» A. Plus | |
| 331. |
The sheet of water flowing over a notch or a weir is known as |
| A. | Sill or crest |
| B. | Nappe or vein |
| C. | Orifice |
| D. | None of these |
| Answer» B. Nappe or vein | |
| 332. |
A structure used to dam up a stream or river over which the water flows is called |
| A. | Orifice |
| B. | Notch |
| C. | Weir |
| D. | Dam |
| Answer» C. Weir | |
| 333. |
A body floating in a liquid is said to be in neutral equilibrium, if its metacentre |
| A. | Coincides with its centre of gravity |
| B. | Lies above its centre of gravity |
| C. | Lies below its centre of gravity |
| D. | Lies between the centre of buoyancy and centre of gravity |
| Answer» A. Coincides with its centre of gravity | |
| 334. |
General energy equation holds for |
| A. | Steady flow |
| B. | Turbulent flow |
| C. | Laminar flow |
| D. | Non-uniform flow |
| Answer» D. Non-uniform flow | |
| 335. |
The buoyancy depends on |
| A. | Mass of liquid displaced |
| B. | Viscosity of the liquid |
| C. | Pressure of the liquid displaced |
| D. | Depth of immersion |
| Answer» A. Mass of liquid displaced | |
| 336. |
The centre of gravity of the volume of the liquid displaced is called |
| A. | Centre of pressure |
| B. | Centre of buoyancy |
| C. | Metacentre |
| D. | None of these |
| Answer» B. Centre of buoyancy | |
| 337. |
The Reynold's number of a ship is __________ to its velocity and length. |
| A. | Directly proportional |
| B. | Inversely proportional |
| C. | Square root of velocity |
| D. | None of these |
| Answer» A. Directly proportional | |
| 338. |
In the above question, if the angular velocity ? is doubled, then the depth of parabola will be |
| A. | halved |
| B. | two times |
| C. | four times |
| D. | eight times |
| Answer» C. four times | |
| 339. |
The total pressure on the top of a closed cylindrical vessel competely filled up with a liquid is |
| A. | directly proportional to (radius)2 |
| B. | inversely proportional to (radius)2 |
| C. | directly proportional to (radius)4 |
| D. | inversely proportional to (radius)4 |
| Answer» C. directly proportional to (radius)4 | |
| 340. |
The discharge over the trapezoidal notch is equal to the discharge over the rectangular notch |
| A. | plus |
| B. | minus |
| Answer» A. plus | |
| 341. |
The coefficient of discharge for an external mouthpiece is |
| A. | 0.375 |
| B. | 0.5 |
| C. | 0.707 |
| D. | 0.855 |
| Answer» D. 0.855 | |
| 342. |
A fluid having no viscosity is known as |
| A. | real fluid |
| B. | ideal fluid |
| C. | newtonian fluid |
| D. | non-newtonian fluid |
| Answer» B. ideal fluid | |
| 343. |
A wwir is said to be broad crested weir. If the width of the crest of the weir is |
| A. | equal to |
| B. | less than |
| C. | more than |
| Answer» C. more than | |
| 344. |
The velocity through a channel of circular section will be maximum when the depth of water is |
| A. | 0.34 times |
| B. | 0.67 times |
| C. | 0.81 times |
| D. | 0.95 times |
| Answer» C. 0.81 times | |
| 345. |
The pressure of the liquid flowing through the divergent portion of a venturimeter |
| A. | remains constant |
| B. | increases |
| C. | decreases |
| D. | depends upon mass of liquid |
| Answer» C. decreases | |
| 346. |
An error of 1% in measureing head over the crest of the notch (H) will produce an error of |
| A. | 1% |
| B. | 1.50% |
| C. | 2% |
| D. | 2.50% |
| Answer» B. 1.50% | |
| 347. |
In a broad-crested weir, the discharge is maximum if the head of water on the downstream side of weir is |
| A. | equal to |
| B. | one-third |
| C. | two-third |
| D. | three-fourth |
| Answer» C. two-third | |
| 348. |
To force present in a moving liquid is |
| A. | inertia force |
| B. | viscous force |
| C. | gravity force |
| D. | all of these |
| Answer» D. all of these | |
| 349. |
If an incompressible liquid is continuously flowing through a pipe, the quantity of liquid passing per second is different at different sections. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 350. |
Which of the following is an example of maninar flow? |
| A. | Under ground flow |
| B. | Flow past tiny bodies |
| C. | Flow of oil in measuring insturments |
| D. | all of these |
| Answer» D. all of these | |
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