McqMate
| 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 | |
| 351. |
When a body is placed over a liquid, it will sink down if |
| A. | gravitational force is equal to the upthrust of the liquid |
| B. | gravitational force is les than the upthrust of the liquid |
| C. | gravitational force is more than the upthrust of the liquid |
| D. | none of the above |
| Answer» C. gravitational force is more than the upthrust of the liquid | |
| 352. |
The pressure of air |
| A. | does not change |
| B. | decreases |
| C. | increases |
| Answer» B. decreases | |
| 353. |
If the coefficient of discharge is 0.6, then the discharge over a right angled notch is |
| A. | 0.417 H5/2 |
| B. | 1.417 H5/2 |
| C. | 4.171 H5/2 |
| D. | 7.141 H5/2 |
| Answer» B. 1.417 H5/2 | |
| 354. |
The velocity corresponding to Reynold number of 2000 is called |
| A. | sub-sonic velocity |
| B. | super-sonic velocity |
| C. | lower critical velocity |
| D. | higher critical velocity |
| Answer» C. lower critical velocity | |
| 355. |
The unit of surface tension is |
| A. | N / m |
| B. | N / m2 |
| C. | N / m3 |
| D. | N - m |
| Answer» A. N / m | |
| 356. |
The velocity at which the turbulent flow starts is known as higher critical velocity. |
| A. | Yes |
| B. | No |
| Answer» A. Yes | |
| 357. |
In order to measure the flow with a venturimeter, it is installed in |
| A. | horizontal line |
| B. | inclined line with flow upwards |
| C. | inclined line with flow downwards |
| D. | any direction and in any location |
| Answer» D. any direction and in any location | |
| 358. |
The shear stress-strain graph for a non-newtonian fluid is a curve. |
| A. | Correct |
| B. | Incorrect |
| Answer» A. Correct | |
| 359. |
The velocity of liquid flowing through an orifice varies with the available head of the liquid. |
| A. | Agree |
| B. | Disagree |
| Answer» A. Agree | |
| 360. |
The D-Alembert's principle is used for changing the dynamic equilibrium of a fluid mass, into a static equilibrium. |
| A. | Agree |
| B. | Disagree |
| Answer» A. Agree | |
| 361. |
When the Mach number is between |
| A. | 1 and 2.5 |
| B. | 2.5 and 4 |
| C. | 4 and 6 |
| D. | 1 and 6 |
| Answer» D. 1 and 6 | |
| 362. |
The hoss of hed due to an obstruction in a pipe is twice the loss of head at its entrance. |
| A. | Agree |
| B. | Disagree |
| Answer» A. Agree | |
| 363. |
The dynamic viscosity of gases |
| A. | remain unaffected |
| B. | increases |
| C. | decreases |
| Answer» B. increases | |
| 364. |
A fluid whose viscosity does not change with the rate of deformation or shear strain is known as |
| A. | real fluid |
| B. | ideal fluid |
| C. | newtonian fluid |
| D. | non-newtonian fluid |
| Answer» C. newtonian fluid | |
| 365. |
If a body floating in a liquid returns back to its original position, when given a small angular displacement, the body is said to be in |
| A. | neutral equilibrium |
| B. | stable equilibrium |
| C. | unstable equilibrium |
| D. | none of these |
| Answer» B. stable equilibrium | |
| 366. |
The property of a liquid which controls its rate of flow is called viscosity. |
| A. | True |
| B. | False |
| Answer» A. True | |
| 367. |
Reyold's number is the ratio of the inertia force to the |
| A. | surface tension force |
| B. | viscous force |
| C. | gravity force |
| D. | elastic force |
| Answer» B. viscous force | |
| 368. |
When the end contractions of the weir are suppressed, then number of end contractions (n) are taken as zero |
| A. | Agree |
| B. | Disagree |
| Answer» A. Agree | |
| 369. |
The specific gravity has no units. |
| A. | Agree |
| B. | Disagree |
| Answer» A. Agree | |
| 370. |
A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. Which of the following statement is correct? |
| A. | The pressure on the wall at the liquid level is minimum. |
| B. | The pressure on the bottom of the wall is maximum |
| C. | The pressure on the wall at the liquid level is zero, and on the bottom of the wall is maximum |
| D. | The pressure on the bottom of the wall is zero. |
| Answer» C. The pressure on the wall at the liquid level is zero, and on the bottom of the wall is maximum | |
| 371. |
The stability of a dam is checked for |
| A. | tension at the base |
| B. | overturning of the wall or dam |
| C. | sliding of the wall or dam |
| D. | all of these |
| Answer» D. all of these | |
| 372. |
The centre of buoyancy is the centre of area of the immersed body. |
| A. | Correct |
| B. | Incorrect |
| Answer» A. Correct | |
| 373. |
The shear stress between the two liquid layers is |
| A. | directly |
| B. | indirectly |
| Answer» B. indirectly | |
| 374. |
The kinematic viscosity of an oil (in stokes) whose specific gravity is 0.95 and viscosity 0.011 poise, is |
| A. | 0.0116 stoke |
| B. | 0.116 stoke |
| C. | 0.0611 stoke |
| D. | 0.611 stoke |
| Answer» A. 0.0116 stoke | |
| 375. |
A nozzle placed at the end of a water pipe line discharges water at a |
| A. | low pressure |
| B. | high pressure |
| C. | low velocity |
| D. | high velocity |
| Answer» D. high velocity | |
| 376. |
Bernoulli's equation is applied to |
| A. | venturimeter |
| B. | orifice meter |
| C. | pitot tube |
| D. | all of these |
| Answer» D. all of these | |
| 377. |
The flow in a pipe is laminar, when Reynold number is less than 2000. |
| A. | True |
| B. | False |
| Answer» A. True | |
| 378. |
Select the wrong statement |
| A. | Weber's number is the ratio of inertia force to elastic force. |
| B. | Weber's number is the ratio of gravity force to surface tension force. |
| C. | Weber's number is the ratio of viscous force to pressure force. |
| D. | Weber's number is the ratio of inertia force to surface tension force. |
| Answer» D. Weber's number is the ratio of inertia force to surface tension force. | |
| 379. |
A vessel of 4 m3 contains an oil which weighs 30 kN. The specific weight of the oil is |
| A. | 4.5 kN / m3 |
| B. | 6 kN / m3 |
| C. | 7.5 kN / m3 |
| D. | 10 kN / m3 |
| Answer» C. 7.5 kN / m3 | |
| 380. |
The quantity of a liquid flowing per second through a section of a pipe or a channel is called discharge and is measured in cumecs (m3/s). |
| A. | True |
| B. | False |
| Answer» A. True | |
| 381. |
Water is |
| A. | a compressible |
| B. | an incompressible |
| Answer» B. an incompressible | |
| 382. |
The specific weight of sea water is |
| A. | same as |
| B. | less than |
| C. | more than |
| Answer» C. more than | |
| 383. |
The separation of flow occurs when the hydrodynamic boundary layer thickness is reduced to zero. |
| A. | Agree |
| B. | Disagree |
| Answer» A. Agree | |
| 384. |
The specific weight of compressible fluids does not remain constant. |
| A. | True |
| B. | False |
| Answer» A. True | |
| 385. |
An internal mouthpiece is said to be runing |
| A. | free |
| B. | partially |
| C. | full |
| Answer» C. full | |
| 386. |
Turbulent flow takes place at high velocities. |
| A. | Agree |
| B. | Disagree |
| Answer» A. Agree | |
| 387. |
The property of a liquid which offers resistance to the movement of one layer of liquid over another adjacent layer of liquid, is called |
| A. | surface tension |
| B. | compressibility |
| C. | capillarity |
| D. | viscosity |
| Answer» D. viscosity | |
| 388. |
The ratio of the inertia force to the surface tension force is called Weber's number. |
| A. | Correct |
| B. | Incorrect |
| Answer» A. Correct | |
| 389. |
A venturiflume is used to measure |
| A. | pressure of liquid |
| B. | discharge of liquid |
| C. | pressure difference between two points in a channel |
| D. | pressure difference between two points in a pipe |
| Answer» B. discharge of liquid | |
| 390. |
A fluid whose viscosity changes with the rate of deformation or shear strain is known as non-newtonian fluid. |
| A. | True |
| B. | False |
| Answer» A. True | |
| 391. |
Falling drops of water become spheres due to the property of |
| A. | surface tension of water |
| B. | compressibility of water |
| C. | capillarity of water |
| D. | viscosity of water |
| Answer» A. surface tension of water | |
| 392. |
A flow in which the quantity of liquid flowing per second is not constant, is called |
| A. | streamline flow |
| B. | turbulent flow |
| C. | steady flow |
| D. | unsteady flow |
| Answer» D. unsteady flow | |
| 393. |
A flow whose streamline is represented by a straight line, is called |
| A. | one |
| B. | two |
| C. | three |
| D. | four |
| Answer» A. one | |
| 394. |
The rise of liquid along the walls of a revolving cylinder about the initial level is |
| A. | same as |
| B. | less than |
| C. | more than |
| Answer» A. same as | |
| 395. |
A nirform body 3 m long, 2 m wide and 1 m deep floats in water. If the depth of immersion is 0.6 m, then the weight of the body is |
| A. | 3.53 kN |
| B. | 33.5 kN |
| C. | 35.3 kN |
| D. | none of these |
| Answer» C. 35.3 kN | |
| 396. |
A point, in a compressible flow where the velocity of fluid is zero, is called |
| A. | critical point |
| B. | vena contracta |
| C. | stagnation point |
| D. | none of these |
| Answer» C. stagnation point | |
| 397. |
The coefficient of viscosity may be determined by |
| A. | capillary tube method |
| B. | orifice type viscometer |
| C. | rotating cylinder method |
| D. | all of these |
| Answer» D. all of these | |
| 398. |
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. | actual discharge through an orifice to the theoretical discharge |
| 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 | |
| 399. |
In an external or internal mouthpiece, the absolute pressure head at vena contracta is zero when atmospheric pressure head is 10.3 m of water. |
| A. | Correct |
| B. | Incorrect |
| Answer» A. Correct | |
| 400. |
When the pressure intensity at a point is less than the local atmospheric pressure, then the difference of these two pressures is called vacuum pressure. |
| A. | Agree |
| B. | Disagree |
| Answer» A. Agree | |
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