McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering .
| 401. |
A flow in which the volume of a fluid and its density does no change during the flow is called |
| A. | incompressible |
| B. | compressible |
| Answer» A. incompressible | |
| 402. |
The volume of a fluid |
| A. | remains same |
| B. | decreases |
| C. | increases |
| Answer» B. decreases | |
| 403. |
The most economical section of a rectangular channel is one which has hydraulic mean depth or hydraulic radius equal to |
| A. | half the depth |
| B. | half the breadth |
| C. | twice the depth |
| D. | twice the breadth |
| Answer» A. half the depth | |
| 404. |
The value of coefficient of discharge is |
| A. | less than |
| B. | same as |
| C. | more than |
| Answer» A. less than | |
| 405. |
A flow in which the viscosity of fluid is dominating over the inertia force is called |
| A. | steady flow |
| B. | unsteady flow |
| C. | laminar flow |
| D. | turbulent flow |
| Answer» C. laminar flow | |
| 406. |
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, at right angles to the direction of flow of the liquid is known as lift. |
| A. | True |
| B. | False |
| Answer» A. True | |
| 407. |
A notch is, usually, made of a metallic plate. |
| A. | Correct |
| B. | Incorrect |
| Answer» A. Correct | |
| 408. |
The flow of water through the hole in the bottom of a wash basin is an example of |
| A. | steady flow |
| B. | uniform flow |
| C. | free vortex |
| D. | forced vortex |
| Answer» C. free vortex | |
| 409. |
When a body is immersed wholly or partially in a liquid, it is lifted up by a force equal to the weight of liquid displaced by the body. This statement is called |
| A. | Pascal's law |
| B. | Archimede's principle |
| C. | principle of floatation |
| D. | Bernoulli's theorem |
| Answer» B. Archimede's principle | |
| 410. |
The difference between the notch and weir is that the notch is of bigger size and the weir is of a smaller size. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 411. |
The hydraulic gradient line lies over the centre line of the pipe by an amount equal to the |
| A. | pressure head |
| B. | velocity head |
| C. | pressure head + velocity head |
| D. | pressure head - velocity head |
| Answer» A. pressure head | |
| 412. |
When the pressure intensity at a point is more than the local atmospheric pressure, then the difference of these two pressures is called |
| A. | gauge pressure |
| B. | absolute pressure |
| C. | positive gauge pressure |
| D. | vacuum pressure |
| Answer» C. positive gauge pressure | |
| 413. |
The length of the divergent cone in a venturimeter is |
| A. | equal to |
| B. | double |
| C. | three to four times |
| D. | five to six times |
| Answer» C. three to four times | |
| 414. |
The depth of water in a channel corresponding to the minimum specific energy is known as critical depth. |
| A. | Agree |
| B. | Disagree |
| Answer» A. Agree | |
| 415. |
The total energy line lies over the centre line of the pipe by an amount equal to |
| A. | pressure head |
| B. | velocity head |
| C. | pressure head + velocity head |
| D. | pressure head - velocity head |
| Answer» C. pressure head + velocity head | |
| 416. |
The metacentric height of a ship is 0.6 m and the radius of gyration is 4 m. The time of rolling of a ship is |
| A. | 4.1s |
| B. | 5.2s |
| C. | 10.4s |
| D. | 14.1s |
| Answer» C. 10.4s | |
| 417. |
The pressure at a stagnation point is always low. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 418. |
In an internal mouthpiece, the absolute pressure head at vena contracta is |
| A. | less than |
| B. | more than |
| Answer» A. less than | |
| 419. |
The hydraulic mean depth for a circular pipe of diameter (d) is |
| A. | d / 6 |
| B. | d / 4 |
| C. | d / 2 |
| D. | d |
| Answer» B. d / 4 | |
| 420. |
According to Newton's law of viscosity, the shear stress on a layer of a fluid is |
| A. | equal to |
| B. | directly proportional |
| C. | inversely proportional |
| Answer» B. directly proportional | |
| 421. |
A moving fluid mass may be brought to a static equilibrium position, by aplying an imaginary inertia force of the same magnitude as that of the accelerating force but in the opposite direction. This statement is called |
| A. | Pascal's law |
| B. | Archimede's principle |
| C. | D-Alembert's principle |
| D. | none of these |
| Answer» C. D-Alembert's principle | |
| 422. |
The siphon is used to connect two reservoirs at different levels intervened by a high ridge. |
| A. | True |
| B. | False |
| Answer» A. True | |
| 423. |
The discharge 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» D. 0.95 times | |
| 424. |
If the value of coefficient of discharge increases, the discharge through the orifice decreases. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 425. |
The Francis formula for the discharge over Cippoletti weir is |
| A. | 1.84 LH1/2 |
| B. | 1.84 LH |
| C. | 1.84 LH3/2 |
| D. | 1.84 LH5/2 |
| Answer» C. 1.84 LH3/2 | |
| 426. |
A differential manometer is used to measure |
| A. | atmospheric pressure |
| B. | pressure in pipes and channels |
| C. | pressure in venturimenter |
| D. | difference of pressures between two points in pipe |
| Answer» D. difference of pressures between two points in pipe | |
| 427. |
When a cylindrical vessel containing liquid is revolved about its vertical axis at a constant angular velocity, the pressure |
| A. | varies as the square of the radial distance |
| B. | increases linearly as its radial distance |
| C. | increases as the square of the radial distance |
| D. | decreases as the square of the radial distance |
| Answer» A. varies as the square of the radial distance | |
| 428. |
The point at which the resultant pressure on an immersed surface acts, is known as |
| A. | centre of gravity |
| B. | centre of depth |
| C. | centre of pressure |
| D. | centre of immersed surface |
| Answer» C. centre of pressure | |
| 429. |
The Reynold's number of a ship is |
| A. | directly proportional |
| B. | inversely proportional |
| Answer» A. directly proportional | |
| 430. |
The purpose of a surge tank is |
| A. | to control the pressure variations due to rapid changes in the pipe line flow |
| B. | to eliminate water hammer possibilities |
| C. | to regulate flow of water to turbines by providing necessary retarding head of water |
| D. | all of the above |
| Answer» D. all of the above | |
| 431. |
In an internal mouthpiece, if the jet after contraction does not touch the sides of the mouthpiece, then the mouthpiece is said to be |
| A. | running full |
| B. | running free |
| C. | partially running full |
| D. | partially running free |
| Answer» B. running free | |
| 432. |
Which of the following statement is wrong? |
| A. | A flow whose streamline is represented by a curve, is called two dimensional flow. |
| B. | The total energy of a liquid particle is the sum of potential energy, inetic energy and pressure energy. |
| C. | The length of divergent portion in a venturimeter is equal to the convergent portion. |
| D. | A pitot tube is used to measure the velocity of flow at the required point in a pipe. |
| Answer» C. The length of divergent portion in a venturimeter is equal to the convergent portion. | |
| 433. |
The length of a liquid stream while flowing over a weir |
| A. | expands |
| B. | does not change |
| C. | contracts |
| Answer» C. contracts | |
| 434. |
If a body floating in a liqid occupies a new position and remains at rest in this new position, when given a small angular displacement, the body is said to be in |
| A. | neutral |
| B. | stable |
| C. | unstable |
| Answer» A. neutral | |
| 435. |
The mass of 2.5 m3 of a certain liquid is 2 tonnes. Its mass density is |
| A. | 200 kg / m3 |
| B. | 400 kg / m3 |
| C. | 600 kg / m3 |
| D. | 800 kg / m3 |
| Answer» D. 800 kg / m3 | |
| 436. |
A pitot tube is used to measure the |
| A. | velocity of flow at the required point in a pipe |
| B. | pressure difference between two points in a pipe |
| C. | total pressure of liquid flowing in a a pipe |
| D. | discharge through a pipe |
| Answer» A. velocity of flow at the required point in a pipe | |
| 437. |
In an internal mouthpiece, if the jet after contraction expands and fills up the whole mouthpiece, then the mouthpiece is said to be running free. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 438. |
The water hammer in pipes occurs due to sudden change in the velocity of flowing liquid. |
| A. | Agree |
| B. | Disagree |
| Answer» A. Agree | |
| 439. |
The imaginary line drawn in the fluid in such a way that the tangent to any point gives the direction of motion at that point, is known as |
| A. | path line |
| B. | stream line |
| C. | steak line |
| D. | potential line |
| Answer» B. stream line | |
| 440. |
The viscosity of water is |
| A. | higher |
| B. | lower |
| Answer» A. higher | |
| 441. |
The siphon will work satisfactorily, if the minimum pressure in the pipe is |
| A. | equal to |
| B. | less than |
| C. | more than |
| Answer» C. more than | |
| 442. |
When the Mach number is less than unity, the flow is called |
| A. | sub-sonic flow |
| B. | sonic flow |
| C. | super-sonic flow |
| D. | hyper-sonic flow |
| Answer» A. sub-sonic flow | |
| 443. |
Froude's number is the ratio of inertia force to |
| A. | pressure force |
| B. | elastic force |
| C. | gravity force |
| D. | surface tension force |
| Answer» C. gravity force | |
| 444. |
In flow in which each liquid particle does not have a definite path and the paths of individual particles also cross each other, is called turbulent flow. |
| A. | Agree |
| B. | Disagree |
| Answer» A. Agree | |
| 445. |
The coefficient of discharge in case of internal mouthpiece is |
| A. | less than |
| B. | more than |
| Answer» A. less than | |
| 446. |
The hydraulic gradient line is always parallel to the centre line of the pipe. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 447. |
In two dimensional flow, the flow does not take place in a curve. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 448. |
A closed tank is completely filled with an oil. If it is made to move with a horizontal acceleration, then the pressure at the back end will be more than that at the front end. |
| A. | Correct |
| B. | Incorrect |
| Answer» A. Correct | |
| 449. |
Which of the following statement is correct ? |
| A. | In a compressible flow, the volume of the flowing liquid changes during the flow. |
| B. | A flow in which the volume of the flowing liquid does not change, is called incompressible flow. |
| C. | When the particles rotate about their own axes while flowing, the flow is said to be rotational flow. |
| D. | all of the above |
| Answer» D. all of the above | |
| 450. |
The metacentric height is the distance between the |
| A. | centre of gravity of the floating body and the centre of buoyancy |
| B. | centre of gravity of the floating body and the metacentre |
| C. | metacentre and centre of buoyancy |
| D. | original centre of buoyancy and new centre of buoyancy |
| Answer» B. centre of gravity of the floating body and the metacentre | |
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