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Mechanical Engineering Objective Questions { Fluid Mechanics }



78. Capillary action is due to the
A.Surface tension
B.Cohesion of the liquid
C.Adhesion of the liquid molecules and the molecules on the surface of a solid
D.(e) all of the above

79. Newton's law of viscosity is a relationship between
A.Shear stress and the rate of angular distortion
B.Shear stress and viscosity
C.Shear stress, velocity and viscosity
D.Pressure, velocity and viscosity

80. The atmospheric pressure with rise in altitude decreases
A.Linearly
B.First slowly and then steeply
C.First steeply and then gradually
D.Unpredictable

81. Operation of McLeod gauge used for low pressure measurement is based on the principle of
A.Gas law
B.Boyle's law
C.Charle's law
D.Pascal's law

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
A.1
B.1.2
C.0.8
D.0.75

83. In an isothermal atmosphere, the pressure
A.Decreases linearly with elevation
B.Remains constant
C.Varies in the same way as the density
D.Increases exponentially with elevation

84. Mercury is often used in barometer because
A.It is the best liquid
B.The height of barometer will be less
C.Its vapour pressure is so low that it may be neglected
D.Both (b) and (c)

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