hydraulics and fluid mechanics MCQs – Page 4

Practise focused hydraulics and fluid mechanics questions with marked answers for exam preparation and subject revision.

hydraulics and fluid mechanics Mcqs

61. Rain drops are spherical because of____________________?
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A. viscosity

B. atmospheric pressure

C. none of the above

D. air resistance

E. surface tension forces

62. The rise or depression of liquid in a tube due to surface tension wim increase in size of tube will_______________?
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A. increase

B. decrease

C. unpredictable

D. remain unaffected

E. may increase or decrease depending on the characteristics of liquid

63. Which of the following manometer has highest sensitivity __________________?
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A. U-tube with mercury

B. U-tube with water

C. inclined U-tube

D. micro-manometer with water

E. displacement type

64. Eulers dimensionless number relates the following_______________?
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A. viscous force and buoyancy force

B. pressure force and inertial force

C. viscous force and inertial force

D. pressure force and viscous force

E. inertial force and gravity

65. A piece weighing 3 kg in air was found to weigh 2.5 kg when submerged in water. Its specific gravity is__________________?
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A. 7

B. 5

C. 1

D. 6

66. To avoid an interruption in the flow of a syphon, an air vessel is provided______________?
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A. at the summit

B. none of the above

C. at the outlet

D. at the inlet

E. ay nay point between inlet and outlet

67. The vapour pressure over the concave surface is__________________?
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A. less man the vapour pressure over the plane surface

B. greater than the vapour pressure over the plane surface

C. zero

D. none of the above

E. equal to the vapour pressure over the plane surface

68. The flow in which conditions do not change with time at any point, is known as _____________________?
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A. uniform flow

B. steady flow

C. streamline flow

D. one dimensional flow

E. turbulent flow

69. If w is the specific weight of liquid and k the depth of any point from the surface, then pressure intensity at that point will be____________________?
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A. wh

B. h/wh

C. w/h

D. h

E. h/w

70. Two dimensional flow occurs when___________________?
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A. velocity, depth, pressure, etc. change from point to point in the fluid flow

B. the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane

C. the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time

D. the direction and magnitude of the velocity at all points are identical

E. the magnitude and direction of the velocity do not change from point to point in the fluid

71. When a body floating in a liquid, is displaced slightly, it oscillates about ___________________?
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A. center of pressure

B. center of buoyancy

C. liquid surface

D. e.g. of body

E. metacentre

72. Choose the wrong statement ?
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A. If e.g. and center of buoyancy coincide, the submerged body must lie at neutral equilibrium for all positions

B. All floating bodies are stable

C. The center of buoyancy is located at the center of gravity of the displaced liquid

D. For stability of a submerged body, the center of gravity of body must lie directly below the center of buoyancy

E. For stability of floating cylinders or spheres, the e.g. of body must lie below the center of buoyancy

73. Uniform flow occurs when____________________?
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A. size and shape of the cross section in a particular length remain constant

B. the flow is steady

C. flow occurs at constant fate

D. the flow is streamline

E. size and cross section change uniformly along length

74. The resultant upward pressure of a fluid on a floating body is equal to the weight of the fluid displaced by the body. This definition is according to____________________?
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A. Equilibrium of a floating body

B. Buoyancy

C. Metacentric principle

D. Bernoullis theorem

E. Archimedes principle

75. General energy equation holds for_________________?
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A. laminar flow

B. steady flow

C. turbulent flow

D. all of the above

E. non-uniform flow

76. The horizontal component of buoyant force is__________________?
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A. negligible

B. zero

C. same as buoyant force

D. non of these

77. A liquid would wet the solid, if adhesion forces as compared to cohesion forces are_________________?
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A. equal

B. more

C. less

D. there is no such criterion

E. less at low temperature and more at high temperature

78. A hydraulic press has a ram of 15 cm diameter and plunger of 1.5 cm. It is required to lift a weight of 1 tonne. The force required on plunger is equal tc__________________?
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A. 1 kg

B. 1000 kg

C. 100 kg

D. 10 kg

E. 10,000 kg

79. A pressure of 25 m of head of water is equal to________________?
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A. 25 kN/m2

B. 2500 kN/m2

C. 245 kN/m2

D. 12.5 kN/m2

E. 2.5kN/m2

80. Pressure of the order of 10? torr can be measured by_______________ ?
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A. McLeod gauge

B. Bourdon tube

C. micro-manometer

D. Pirani Gauge

E. ionisastion gauge

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