hydraulics and fluid mechanics MCQs – Page 5

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

hydraulics and fluid mechanics Mcqs

81. Newtons law of viscosity is a relationship between________________?
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A. shear stress and viscosity

B. shear stress anctthejiate of angular distortion

C. pressure, velocity and viscosity

D. shear stress, pressure and rate of angular distortion

E. shear stress, velocity and viscosity

82. 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_________________?
0

A. 1

B. 0.8

C. 1.2

D. 0.75

E. 1.25

83. The vapour pressure over the concave surface is________________?
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A. zero

B. greater than the vapour pressure over the plane surface

C. less man the vapour pressure over the plane surface

D. equal to the vapour pressure over the plane surface

E. none of the above

84. According to the principle of buoyancy a body totally or partially immersed in a fluid will be lifted up by a force equal to __________________?
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A. more than the weight of the body

B. less than the weight of the body

C. weight of the fluid displaced by the body

D. weight of body plus the weight of the fluid displaced hy the body

E. the weight of the body

85. Barometer is used to measure__________________?
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A. very low pressure

B. rain level

C. atmospheric pressure

D. pressure in pipes, channels etc.

E. difference of pressure between two points

86. The depth of the center of pressure on a vertical rectangular gate 8 m wide and 6 m high, when the water surface coincides with the top of the gate, is ______________________?
0

A. 2.4 m

B. 5.0 m

C. 3.0 m

D. 2.5 m

E. 4.0 m

87. Which of the following instruments is used to measure flow on the application of Bernoullis theorem __________________?
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A. pitot tube

B. all of the above

C. Orifice plate

D. nozzle

E. Venturimeter

88. For a floating body to be in equilibrium __________________?
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A. center of buoyancy and e.g. must lie on same vertical plane

B. none of the above

C. meta center should be above e.g.

D. a righting couple should be formed

E. all of the above

89. A piece of metal of specific gravity 7 floats in mercury of specific gravity 13.6. What fraction of its volume is under mercury ?
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A. 0.4

B. 0.515

C. 0.5

D. none of the above

E. 0.5

90. 4-61. Kinematic viscosity is equal to________________?
0

A. 1/dynamicviscosity x density

B. dynamic viscosity/density

C. dynamicviscosity x density

D. density/dynamic viscosity

E. same as dynamic viscosity

91. Which of the following instrument can be used for measuring speed of a submarine moving in deep sea_________________?
0

A. hot wire anemometer

B. rotameter

C. Venturimeter

D. pitot tube

E. Orifice plate

92. Surface energy per unit area of a surface is numerically equal to ___________________?
0

A. surface tension

B. force of adhesion

C. viscosity

D. atmospheric pressure

E. force of cohesion

93. Non uniform flow occurs when ____________________?
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A. velocity, depth, pressure, etc. change from point to point in the fluid flow

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

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

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

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

94. The difference of pressure between the inside and outside of a liquid drop is________________?
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A. = T/r

B. none of the above

C. = Txr

D. p = T/2r

E. p = 2T/r

95. Ratio of inertia force to surface Jension is known as ________________________?
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A. Mach number

B. Webers number

C. Froude number

D. Reynolds number

E. none of the above

96. Principle of similitude forms the basis of__________________?
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A. performing acceptance tests

B. hydraulic designs

C. comparing two identical equipments

D. designing models so that the result can be converted to prototypes

E. comparing similarity between design and actual equipment

97. All the terms of energy in Bernoullis equation have dimension of_______________?
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A. energy

B. length

C. mass

D. time

E. work

98. The center of pressure of a surface subjected to fluid pressure is the point____________________?
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A. on the surface at which gravitational force acis

B. on the surface at which resultant pres-sure acts

C. where pressure equivalent to hydraulic thrust will act

D. similar to metacentre

E. at which all hydraulic forces meet

99. For pipes, laminar flow occurs when Roynolds number is__________________?
0

A. none of the above

B. less than 4000

C. more than 4000

D. less than 2000

E. between 2000 and 4000

100. In an isothermal atmosphere, the pressure__________________?
0

A. unpredictable

B. remains constant

C. decreases linearly with elevation

D. increases exponentially with elevation

E. varies in the same way as the density

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