Correct : D. When in equilibrium, fluids can sustain shear forces
2. An orifice is said to be large, if
Correct : D. The available head of liquid is less than 5 times the height of orifice
3. A piece of metal of specific gravity 13.6 is placed in mercury of specific gravity 13.6, what
fraction of it volume is under mercury?
Correct : C. Whole of the metal piece will be immersed with its top surface just at mercury level
4. Dynamic viscosity of most of the liquids with rise in temperature
Correct : B. Decreases
5. Select the correct statement
Correct : B. Standard atmospheric pressure is the mean local atmospheric pressure a* sea level
6. The flow in which the particles of a fluid attain such velocities that varies from point to point in
magnitude and direction as well as from instant to instant, is known as
Correct : D. Turbulent flow
7. The specific weight of sea water is __________ that of pure water.
Correct : C. More than
8. Which of the following instruments is used to measure flow on the application of Bernoulli's
theorem?
Correct : D. All of the above
9. An ideal flow of any fluid must satisfy
Correct : D. Continuity equation
10. The height of a water column equivalent to a pressure of 0.15 MPa is
Correct : A. 15.3 m
11. The ratio of specific weight of a liquid to the specific weight of pure water at a standard
temperature is called
Correct : B. Specific gravity of liquid
12. 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 to
Correct : A. 10 kg
13. The total head of a liquid particle in motion is equal to
Correct : A. Pressure head + kinetic head + potential head
14. When the Venturimeter is inclined, then for a given flow it will show __________ reading.
Correct : A. Same
15. Cavitation is caused by
Correct : D. Low pressure
16. An ideal flow of any fluid must fulfill the following
Correct : D. Continuity equation
17. Surface tension
Correct : A. Acts in the plane of the interface normal to any line in the surface
18. Alcohol is used in manometers because
Correct : D. It can provide longer column due to low density
19. The discharge through a wholly drowned orifice is given by (where H1 = Height of water (on
the upstream side) above the top of the orifice, H2 = Height of water (on the downstream side) above the bottom of the orifice, and H = Difference between two water levels on either side of the orifice)
Correct : C. Q = Cd × b (H2 - H1) × √(2gh)
20. If no resistance is encountered by displacement, such a substance is known as
Correct : D. Ideal fluid
21. The kinematic viscosity is the
Correct : A. Ratio of absolute viscosity to the density of the liquid
22. Choose the correct relationship
Correct : B. Dynamic viscosity = kinematic viscosity × density
23. The viscosity of water is __________ than that of mercury.
Correct : A. Higher
24. Surface energy per unit area of a surface is numerically equal to
Correct : B. Surface tension
25. Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area due
to the
Correct : B. Force of cohesion
26. Which of the following statement is correct?
Correct : D. All of the above
27. Choose the wrong statement
Correct : D. Viscosity of liquids is appreciably affected by change in pressure
28. The unit of dynamic viscosity in S.I. units is
Correct : B. N-s/m2
29. A perfect gas
Correct : D. None of the above
30. In a static fluid
Correct : D. Only normal stresses can exist
31. One liter of water occupies a volume of
Correct : D. 1000 cm3
32. The maximum discharge over a broad crested weir is
Correct : D. 1.71 Cd × L × H3/2
33. The ratio of absolute viscosity to mass density is known as
Correct : C. Kinematic viscosity
34. Hot wire anemometer is used to measure
Correct : D. Gas velocities
35. Venturimeter is used to
Correct : C. Measure the discharge of liquid flowing in a pipe
36. The pressure measured with the help of a pressure gauge is called
Correct : B. Gauge pressure
37. In order to increase sensitivity of U-tube manometer, one leg is usually inclined by angle 'θ'.
Sensitivity of inclined tube to sensitivity of U-tube is equal to
Correct : B. 1/Sinθ
38. Capillary action is due to the
Correct : D. All of the above
39. The intensity of pressure on an immersed surface __________ with the increase in depth.
Correct : B. Increases
40. Stoke is the unit of
Correct : A. Kinematic viscosity in C. G. S. units
41. The vapour pressure over the concave surface is
Correct : A. Less man the vapour pressure over the plane surface
42. Mercury is often used in barometer because
Correct : D. Both (B) and (C)
43. Gradually varied flow is
Correct : D. Steady non-uniform
44. The viscosity of water at 20°C is
Correct : D. One centipoise
45. According to Bernoulli's equation for steady ideal fluid flow
Correct : D. The energy is constant along a streamline but may vary across streamlines
46. Bernoulli equation deals with the law of conservation of
Correct : C. Energy
47. If the surface of liquid is convex, men
Correct : C. Cohesion pressure is increased
48. The atmospheric pressure with rise in altitude decreases
Correct : B. First slowly and then steeply
49. Dynamic viscosity of most of the gases with rise in temperature
Correct : A. Increases
50. According to Bernoulli's equation
Correct : A. Z + p/w + v²/2g = constant
51. For a body floating in a liquid the normal pressure exerted by the liquid acts at
Correct : D. All points on the surface of the body
52. Newton's law of viscosity is a relationship between
Correct : B. Shear stress and rate of shear strain
53. A fluid in equilibrium can't sustain
Correct : C. Shear stress
54. Liquids
Correct : D. None of the above
55. When a cylindrical vessel containing liquid is resolved, the surface of the liquid takes the shape
of
Correct : B. A paraboloid
56. Fluid is a substance that
Correct : D. Cannot remain at rest under action of any shear force
57. The property of a fluid which enables it to resist tensile stress is known as
Correct : C. Cohesion
58. The surface tension of mercury at normal temperature compared to that of water is
Correct : A. More
59. The unit of viscosity is
Correct : B. kg-sec/meter
60. Choose the wrong statement. Alcohol is used in manometer, because
Correct : A. Its vapour pressure is low
61. A fluid which obeys the Newton's law of viscosity is termed as
Correct : C. Newtonian fluid
62. In order that flow takes place between two points in a pipeline, the differential pressure
between these points must be more than
Correct : D. All of the above
63. The value of coefficient of velocity for a sharp edged orifice __________ with the head of
water.
Correct : B. Increases
64. 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
Correct : C. Lower than the surface of liquid
65. A one dimensional flow is one which
Correct : D. Involves zero transverse component of flow
66. According to Manning's formula, the discharge through an open channel is (where M =
Manning's constant)
Correct : B. A × M × m2/3 × i1/2
67. The property of fluid by virtue of which it offers resistance to shear is called
Correct : D. Viscosity
68. Coefficient of velocity is defined as the ratio of
Correct : A. Actual velocity of jet at vena contracta to the theoretical velocity
69. A liquid compressed in cylinder has a volume of 0.04 m3 at 50 kg/cm² and a volume of 0.039
m3 at 150 kg/cm². The bulk modulus of elasticity of liquid is
Correct : B. 4000 kg/cm²
70. The mass of 2.5 m3 of a certain liquid is 2 tonnes. Its mass density is
Correct : D. 800 kg/m3
71. Free surface of a liquid tends to contract to the smallest possible area due to force of
Correct : A. Surface tension
72. When the Mach number is less than unity, the flow is called
Correct : A. Sub-sonic flow
73. The product of mass and acceleration of flowing liquid is called
Correct : A. Inertia force
74. Ratio of inertia force to elastic force is known as
Correct : A. Mach number
75. Euler's number is the ratio of __________ force to pressure force.
Correct : A. Inertia
76. Ratio of inertia force to surface tension is known as
Correct : D. Weber's number
77. The force present in a moving liquid is
Correct : D. All of these
78. A ship whose hull length is 100 m is to travel at 10 m/sec. For dynamic similarity, at what velocity should a 1:25 model be towed through water?
Correct : C. 2 m/sec
79. When the Mach number is more than 6, the flow is called
Correct : D. Hyper-sonic flow
80. The ratio of the inertia force to the viscous force is called
Correct : A. Reynold's number
81. Reynold's number is the ratio of the inertia force to the
Correct : B. Viscous force
82. Froude number is significant in
Correct : C. Simultaneous motion through two fluids where there is a surface of discontinuity, gravity forces, and wave making effect, as with ship's hulls
83. Reynold's number is the ratio of inertia force to
Correct : D. Viscous force
84. Principle of similitude forms the basis of
Correct : B. Designing models so that the result can be converted to prototypes
85. Select the correct statement
Correct : D. Weber's number is the ratio of inertia force to surface tension force
86. For similarity, in addition to models being geometrically similar to prototype, the following in both cases should also be equal
Correct : D. All the four ratios of inertial force to force due to viscosity, gravitation, surface tension, and elasticity
87. The ratio of the inertia force to the __________ is called Euler's number.
Correct : A. Pressure force
88. Dimensions of surface tension are
Correct : A. ML°T⁻²
89. Centrifugal pump is a
Correct : A. Turbomachinery
90. Turbomachines work under
Correct : B. Newtons second law
91. The main function of centrifugal pumps are to
Correct : D. Transfer energy
92. Turbines and compressors work with the gas, while centrifugal pump transfers energy.
Correct : A. True
93. The inlet passage of water entry is controlled by
Correct : B. Gate
94. Centrifugal pumps are used to transport
Correct : D. Fluid View Answer
95. Centrifugal pumps transport fluids by converting
Correct : A. Kinetic energy to hydrodynamic energy
96. With the increase in load, Energy in the turbine
Correct : A. Decreases
97. When the balancing of the turbine is disturbed, we use
Correct : D. Emergency governing View Answer
98. The fluid coming into the centrifugal pump is accelerated by
Correct : B. Impeller
99. A gear pump uses
Correct : B. Meshing of gears
100. The fundamental significance of all the turbomachinery is