MCQOPTIONS
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MCQOPTIONS
This section includes 154 Mcqs, each offering curated multiple-choice questions to sharpen your Hydraulics and Fluid Mechanics knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
If cohesion between molecules of a fluid is greater than adhesion between fluid and glass, then the free level of fluid in a dipped glass tube will be |
| A. | Higher than the surface of liquid |
| B. | The same as the surface of liquid |
| C. | Lower than the surface of liquid |
| D. | Unpredictable |
| Answer» D. Unpredictable | |
| 52. |
The error in discharge (dQ/Q) to the error in measurement of head (dH/H) over a triangular notch is given by |
| A. | dQ/Q = 3/2 (dH/H) |
| B. | dQ/Q = 2 (dH/H) |
| C. | dQ/Q = 5/2 (dH/H) |
| D. | dQ/Q = 3 (dH/H) |
| Answer» D. dQ/Q = 3 (dH/H) | |
| 53. |
In order that flow takes place between two points in a pipeline, the differential pressure between these points must be more than |
| A. | Frictional force |
| B. | Viscosity |
| C. | Surface friction |
| D. | All of the above |
| Answer» E. | |
| 54. |
In a forced vortex, the velocity of flow everywhere within the fluid is |
| A. | Maximum |
| B. | Minimum |
| C. | Zero |
| D. | Nonzero finite |
| Answer» E. | |
| 55. |
Mach number is significant in |
| A. | Supersonics, as with projectiles and jet propulsion |
| B. | Full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc. |
| C. | Simultaneous motion through two fluids where there is a surface of discontinuity, gravity force, and wave making effects, as with ship's hulls |
| D. | All of the above |
| Answer» B. Full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc. | |
| 56. |
Steady flow occurs when |
| A. | The direction and magnitude of the velocity at all points are identical |
| B. | The velocity of successive fluid particles, at any point, is the same at successive periods of time |
| C. | The fluid particles move in plane or parallel planes and the streamline patterns are identical in each plane |
| D. | The magnitude and direction of the velocity do not change from point to point in the fluid |
| Answer» C. The fluid particles move in plane or parallel planes and the streamline patterns are identical in each plane | |
| 57. |
In an immersed body, centre of pressure is |
| A. | At the centre of gravity |
| B. | Above the centre of gravity |
| C. | Below be centre of gravity |
| D. | Could be above or below e.g. depending on density of body and liquid |
| Answer» D. Could be above or below e.g. depending on density of body and liquid | |
| 58. |
For similarity, in addition to models being geometrically similar to prototype, the following in both cases should also be equal |
| A. | Ratio of inertial force to force due to viscosity |
| B. | Ratio of inertial force to force due to gravitation |
| C. | Ratio of inertial force to force due to surface tension |
| D. | All the four ratios of inertial force to force due to viscosity, gravitation, surface tension, and elasticity |
| Answer» E. | |
| 59. |
The vapour pressure over the concave surface is |
| A. | Less man the vapour pressure over the plane surface |
| B. | Equal to the vapour pressure over the plane surface |
| C. | Greater than the vapour pressure over the plane surface |
| D. | Zero |
| Answer» B. Equal to the vapour pressure over the plane surface | |
| 60. |
The point in the immersed body through which the resultant pressure of the liquid may be taken to act is known as |
| A. | Meta center |
| B. | Center of pressure |
| C. | Center of buoyancy |
| D. | Center of gravity |
| Answer» C. Center of buoyancy | |
| 61. |
The formula for discharge over a sharp-crested weir and Ogee weir is same as that of a rectangular weir. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 62. |
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» D. | |
| 63. |
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» D. three-fourth | |
| 64. |
In an external mouthpiece, the absolute pressure head at vena contracta is |
| A. | less than |
| B. | more than |
| Answer» B. more than | |
| 65. |
An open tank containing liquid is moving with an acceleration on an inclined plane. The inclination of the free surface of the liquid will be |
| A. | equal to |
| B. | directly proportional |
| C. | inversely proportional |
| Answer» C. inversely proportional | |
| 66. |
The property of a liquid which enables into resist tensile stress is called its surface tension. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 67. |
In a venturimeter, the velocity of liquid at throat is |
| A. | higher |
| B. | lower |
| Answer» B. lower | |
| 68. |
A weir is said to be narrow-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 | |
| 69. |
An opening in the side of a tank or vessel such that the liquid surface with the tank is below the top edge of the opening, is called. |
| A. | weir |
| B. | notch |
| C. | orifice |
| D. | none of these |
| Answer» C. orifice | |
| 70. |
The pressure of liquid at throat in a venturimeter is |
| A. | higher |
| B. | lower |
| Answer» C. | |
| 71. |
An internal mouthpiece is said to be running free if the length of the mouthpiece is |
| A. | less than twice |
| B. | more than twice |
| C. | less than three times |
| D. | more than three times |
| Answer» D. more than three times | |
| 72. |
The power transmitted through the nozzle is maximum when the head lost due to friction in the pipe is |
| A. | one-half |
| B. | one-third |
| C. | two-third |
| Answer» C. two-third | |
| 73. |
Re-entrant or Borda's mouthpiece is an |
| A. | internal |
| B. | external |
| Answer» B. external | |
| 74. |
The coefficient of venturiflume, generally lies between |
| A. | 0.3 to 0.45 |
| B. | 0.50 to 0.75 |
| C. | 0.75 to 0.95 |
| D. | 0.95 to 1.0 |
| Answer» E. | |
| 75. |
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» D. none of these | |
| 76. |
A flow whose streamline is represented by a straight line, is called |
| A. | one |
| B. | two |
| C. | three |
| D. | four |
| Answer» B. two | |
| 77. |
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» B. less than | |
| 78. |
An internal mouthpiece is said to be runing |
| A. | free |
| B. | partially |
| C. | full |
| Answer» D. | |
| 79. |
The specific weight of sea water is |
| A. | same as |
| B. | less than |
| C. | more than |
| Answer» D. | |
| 80. |
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» C. inversely proportional | |
| 81. |
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» D. five to six times | |
| 82. |
In an internal mouthpiece, the absolute pressure head at vena contracta is |
| A. | less than |
| B. | more than |
| Answer» B. more than | |
| 83. |
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» E. | |
| 84. |
The volume of a fluid |
| A. | remains same |
| B. | decreases |
| C. | increases |
| Answer» C. increases | |
| 85. |
The siphon is used to connect two reservoirs at different levels intervened by a high ridge. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 86. |
The value of coefficient of discharge is |
| A. | less than |
| B. | same as |
| C. | more than |
| Answer» B. same as | |
| 87. |
The siphon will work satisfactorily, if the minimum pressure in the pipe is |
| A. | equal to |
| B. | less than |
| C. | more than |
| Answer» D. | |
| 88. |
The length of a liquid stream while flowing over a weir |
| A. | expands |
| B. | does not change |
| C. | contracts |
| Answer» D. | |
| 89. |
The water hammer in pipes occurs due to sudden change in the velocity of flowing liquid. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 90. |
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» B. stable | |
| 91. |
The viscosity of water is |
| A. | higher |
| B. | lower |
| Answer» B. lower | |
| 92. |
The Reynold's number of a ship is |
| A. | directly proportional |
| B. | inversely proportional |
| Answer» B. inversely proportional | |
| 93. |
The coefficient of discharge in case of internal mouthpiece is |
| A. | less than |
| B. | more than |
| Answer» B. more than | |
| 94. |
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» E. | |
| 95. |
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» D. eight times | |
| 96. |
To force present in a moving liquid is |
| A. | inertia force |
| B. | viscous force |
| C. | gravity force |
| D. | all of these |
| Answer» E. | |
| 97. |
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» D. 0.95 times | |
| 98. |
The dynamic viscosity of gases |
| A. | remain unaffected |
| B. | increases |
| C. | decreases |
| Answer» C. decreases | |
| 99. |
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» B. Disagree | |
| 100. |
The pressure of air |
| A. | does not change |
| B. | decreases |
| C. | increases |
| Answer» C. increases | |