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MCQOPTIONS
This section includes 4791 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 3501. |
The error in discharge (dQ/Q) to the error in measurement of head (dH/H) over a triangular notch is given by |
| A. | <img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/166-201-4.png"> |
| B. | <img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/166-202-1.png"> |
| C. | <img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/166-202-2.png"> |
| D. | <img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/166-202-3.png"> |
| Answer» D. <img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/166-202-3.png"> | |
| 3502. |
The top of the weir over which the water flows is known as |
| A. | sill or crest |
| B. | nappe or vein |
| C. | orifice |
| D. | none of these |
| Answer» B. nappe or vein | |
| 3503. |
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» D. none of these | |
| 3504. |
A nozzle is generally made of |
| A. | cylindrical shape |
| B. | convergent shape |
| C. | divergent shape |
| D. | convergent-divergent shape |
| Answer» C. divergent shape | |
| 3505. |
In order to avoid tendency of separation at throat in a venturimeter, the ratio of the diameter at throat to the diameter of pipe should be |
| A. | <img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/159-138-1.png"> |
| B. | <img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/159-138-2.png"> |
| C. | <img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/159-138-3.png"> |
| D. | <img src="/_files/images/mechanical-engineering/hydraulics-and-fluid-mechanics/159-138-4.png"> |
| Answer» E. | |
| 3506. |
The ratio of the inertia force to the __________ is called Euler's number. |
| A. | pressure force |
| B. | elastic force |
| C. | surface tension force |
| D. | viscous force |
| Answer» B. elastic force | |
| 3507. |
The discharge through a convergent mouthpiece is __________ the discharge through an internal mouthpiece of the same diameter and head of water. |
| A. | equal to |
| B. | one-half |
| C. | three fourth |
| D. | double |
| Answer» E. | |
| 3508. |
If the depth of water in an open channel is less than the critical depth, the flow is called |
| A. | critical flow |
| B. | turbulent flow |
| C. | tranquil flow |
| D. | torrential flow |
| Answer» E. | |
| 3509. |
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» E. | |
| 3510. |
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» C. principle of floatation | |
| 3511. |
The velocity of flow is same at all points in the cross-section of a channel. |
| A. | True |
| B. | False |
| Answer» C. | |
| 3512. |
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» D. none of these | |
| 3513. |
The length of a liquid stream while flowing over a weir __________ at the ends of the sill. |
| A. | expands |
| B. | does not change |
| C. | contracts |
| Answer» D. | |
| 3514. |
Select the wrong statement |
| A. | An equivalent pipe is treated as an ordinary pipe for all calculations |
| B. | The length of an equivalent pipe is equal to that of a compound pipe |
| C. | The discharge through an equivalent pipe is equal to that of a compound pipe |
| D. | The diameter of an equivalent pipe is equal to that of a compound pipe |
| Answer» E. | |
| 3515. |
The shear stress between the two liquid layers is __________ proportional to the distance between two layers. |
| A. | directly |
| B. | indirectly |
| Answer» C. | |
| 3516. |
The mass per unit volume of a liquid at a standard temperature and pressure is called |
| A. | specific weight |
| B. | mass density |
| C. | specific gravity |
| D. | none of these |
| Answer» C. specific gravity | |
| 3517. |
A flow in which each liquid particle has a definite path, and the paths of individual particles do not cross each other, is called |
| A. | steady flow |
| B. | uniform flow |
| C. | streamline flow |
| D. | turbulent flow |
| Answer» D. turbulent flow | |
| 3518. |
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» B. lies above its centre of gravity | |
| 3519. |
The total pressure on the bottom of a closed cylindrical vessel completely filled up with a liquid is the sum of the total centrifugal pressure and the weight of the liquid in the vessel. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 3520. |
When the Mach number is equal to unity, the flow is called sonic flow. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 3521. |
A weir, generally, used as a spillway of a dam is |
| A. | narrow crested weir |
| B. | broad crested weir |
| C. | Ogee weir |
| D. | submerged weir |
| Answer» D. submerged weir | |
| 3522. |
A thick liquid like a syrup has a __________ viscosity than a light liquid like water. |
| A. | lesser |
| B. | greater |
| Answer» C. | |
| 3523. |
A fluid whose viscosity changes with the rate of deformation or shear strain is known as non-newtonian fluid. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 3524. |
The velocity through a channel of circular section will be maximum when the depth of water is __________ the diameter of the circular channel. |
| A. | 0.34 times |
| B. | 0.67 times |
| C. | 0.81 times |
| D. | 0.95 times |
| Answer» D. 0.95 times | |
| 3525. |
In a footstep bearing, if the radius of the shaft is doubled, then the torque required to overcome the viscous resistance will be |
| A. | double |
| B. | four times |
| C. | eight times |
| D. | sixteen times |
| Answer» E. | |
| 3526. |
The centre of pressure acts __________ the centre of gravity of immersed surface. |
| A. | at |
| B. | above |
| C. | below |
| Answer» D. | |
| 3527. |
When a body is placed over a liquid, it is subjected to gravitational force and upthrust of the liquid. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 3528. |
Froude's number is the ratio of inertia force to |
| A. | pressure force |
| B. | elastic force |
| C. | gravity force |
| D. | surface tension force |
| Answer» D. surface tension force | |
| 3529. |
When a liquid is flowing through a pipe, the velocity of the liquid is |
| A. | maximum at the centre and minimum near the walls |
| B. | minimum at the centre and maximum near the walls |
| C. | zero at the centre and maximum near the walls |
| D. | maximum at the centre and zero near the walls |
| Answer» B. minimum at the centre and maximum near the walls | |
| 3530. |
When a tube of smaller diameter is dipped in water, the water rises in the tube with an upward __________ surface. |
| A. | concave |
| B. | convex |
| Answer» B. convex | |
| 3531. |
An orifice is said to be large, if |
| A. | the size of orifice is large |
| B. | the velocity of flow is large |
| C. | the available head of liquid is more than 5 times the height of orifice |
| D. | the available head of liquid is less than 5 times the height of orifice |
| Answer» E. | |
| 3532. |
The flow in a pipe or channel is said to be uniform when |
| A. | the liquid particles at all sectons have the same velocities |
| B. | the liquid particles at different sections have different velocities |
| C. | the quantity of liquid flowing per second is constant |
| D. | each liquid particle has a definite path |
| Answer» B. the liquid particles at different sections have different velocities | |
| 3533. |
The highest efficiency is obtained with a channel of __________ section. |
| A. | circular |
| B. | square |
| C. | rectangular |
| D. | trapezoidal |
| Answer» E. | |
| 3534. |
The density of a liquid in kg/m3 is numerically equal to its specific gravity. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 3535. |
The critical depth meter is used to measure |
| A. | velocity of flow in an open channel |
| B. | depth of flow in an open channel |
| C. | hydraulic jump |
| D. | depth of channel |
| Answer» D. depth of channel | |
| 3536. |
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» C. partially running full | |
| 3537. |
The value of coefficient of velocity for a sharp edged orifice __________ with the head of water. |
| A. | decreases |
| B. | increases |
| Answer» C. | |
| 3538. |
One cubic metre of water weighs |
| A. | 100 litres |
| B. | 250 litres |
| C. | 500 litres |
| D. | 1000 litres |
| Answer» E. | |
| 3539. |
Surface tension force is the product of surface tension per unit length and cross-sectional area of flow. |
| A. | Correct |
| B. | Incorrect |
| Answer» C. | |
| 3540. |
An average value of coefficient of velocity is |
| A. | 0.62 |
| B. | 0.76 |
| C. | 0.84 |
| D. | 0.97 |
| Answer» E. | |
| 3541. |
The coefficient of discharge is the ratio of theoretical discharge to the actual discharge through an orifice. |
| A. | True |
| B. | False |
| Answer» C. | |
| 3542. |
The force of buoyancy is always __________ the weight of the liquid displaced by the body. |
| A. | equal to |
| B. | less than |
| C. | more than |
| Answer» B. less than | |
| 3543. |
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» B. False | |
| 3544. |
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» E. | |
| 3545. |
A fluid which obeys the Newton's law of viscosity is termed as |
| A. | real fluid |
| B. | ideal fluid |
| C. | newtonian fluid |
| D. | non-newtonian fluid |
| Answer» D. non-newtonian fluid | |
| 3546. |
In a venturiflume, the flow takes place at |
| A. | atmospheric pressure |
| B. | gauge pressure |
| C. | absolute pressure |
| D. | none of these |
| Answer» B. gauge pressure | |
| 3547. |
The discharge in an open channel corresponding to critical depth is |
| A. | zero |
| B. | minimum |
| C. | maximum |
| Answer» D. | |
| 3548. |
The pressure of liquid at throat in a venturimeter is __________ than that at inlet. |
| A. | higher |
| B. | lower |
| Answer» C. | |
| 3549. |
The separation of flow occurs when the hydrodynamic boundary layer thickness is reduced to zero. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 3550. |
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 pipe |
| D. | discharge through a pipe |
| Answer» B. pressure difference between two points in a pipe | |