4. Pressure of the order of 10" torr can be measured by
Correct : D. Lonisation gauge
5. The volume of a fluid __________ as the pressure increases.
Correct : B. Decreases
6. Buoyant force is
Correct : B. The resultant force on a body due to the fluid surrounding it
7. A flow through a long pipe at decreasing rate is called __________ uniform flow.
Correct : B. Unsteady
8. Choose the wrong statement
Correct : D. All floating bodies are stable
9. The intensity of pressure at any point, in a liquid, is __________ to the depth of liquid from the surface.
Correct : B. Directly proportional
10. The discharge in an open channel corresponding to critical depth is
Correct : C. Maximum
11. A piece of wood having weight 5 kg floats in water with 60% of its volume under the liquid. The
specific gravity of wood is
Correct : B. 0.6
12. A pitot tube is used to measure the
Correct : A. Velocity of flow at the required point in a pipe
13. The total energy of each particle at various places in the case of perfect incompressible fluid
flowing in continuous stream
Correct : C. Remain constant
14. The critical depth meter is used to measure
Correct : C. Hydraulic jump
15. Two pipe systems can be said to be equivalent, when the following quantities are same
Correct : A. Friction loss and flow
16. In a footstep bearing, if the radius of the shaft is doubled, then the torque required to overcome the
viscous resistance will be
Correct : D. Sixteen times
17. The value of bulk modulus of a fluid is required to determine
Correct : C. Mach number
18. Fluid is a substance which offers no resistance to change of
Correct : C. Shape
19. The pressure less than atmospheric pressure is known as
Correct : D. All of these
20. The normal stress in a fluid will be constant in all directions at a point only if
Correct : D. It is at rest
21. The power transmitted through a pipe is (where w = Specific weight in N/m3, and Q = Discharge in m3/s)
Correct : C. w × Q (H - hf)
22. A compound pipe is required to be replaced by a new pipe. The two pipes are said to be equivalent, if
Correct : C. Loss of head and discharge of both the pipes is same
23. The center of gravity of the volume of the liquid displaced by an immersed body is called
Correct : C. Center of buoyancy
24. A flow is called sub-sonic, if the Mach number is
Correct : A. Less than unity
25. Barometer is used to measure
Correct : B. Atmospheric pressure
26. The center of pressure of a surface subjected to fluid pressure is the point
Correct : A. On the surface at which resultant pressure acts
27. The variation in the volume of a liquid with the variation of pressure is called its
Correct : B. Compressibility
28. The surface tension of mercury at normal temperature is __________ that of water.
Correct : C. Higher than
29. Flow of water in a pipe about 3 metres in diameter can be measured by
Correct : D. Pitot tube
30. According to Francis formula, the discharge over a rectangular weir is (where n = Number of end contractions)
Correct : B. (2/3) × Cd (L - 0.1nH) × × H3/2
31. The equation of continuity holds good when the flow
Correct : D. All of the above
32. A thick liquid like syrup has a __________ viscosity than a light liquid like water.
Correct : B. Greater
33. Cavitation will begin when
Correct : A. The pressure at any location reaches an absolute pressure equal to the saturated vapour pressure of the liquid
34. When a liquid is flowing through a pipe, the velocity of the liquid is
Correct : A. Maximum at the centre and minimum near the walls
35. The velocity through a channel of circular section will be maximum when the depth of water is __________ the diameter of the circular channel.
Correct : C. 0.81 times
36. Resultant pressure of the liquid in the case of an immersed body acts through
Correct : B. Centre of pressure
37. A fluid is said to be ideal, if it is
Correct : D. Inviscous and incompressible
38. In a depressed nappe
Correct : B. The pressure below the nappe is negative
39. The value of the coefficient of compressibility for water at ordinary pressure and temperature in kg/cm is equal to
Correct : D. 21,000
40. In one dimensional flow, the flow
Correct : B. Takes place in straight line
41. To avoid vaporisation in the pipe line, the pipe line over the ridge is laid such that it is not more than
Correct : B. 6.4 m above the hydraulic gradient
42. The loss of head at exit of a pipe is (where v = Velocity of liquid in the pipe)
Correct : A. v²/2g
43. Metacentre is the point of intersection of
Correct : B. Buoyant force and the center line of body
44. The imaginary line drawn in the fluid in such a way that the tangent to any point gives the
direction of motion at that point, is known as
Correct : B. Stream line
45. An open vessel of water is accelerated up an inclined plane. The free water surface will
Correct : C. Make an angle in opposite direction to inclination of inclined plane
46. The discharge over a rectangular notch is
Correct : B. Directly proportional to H3/2
47. The flow in which each liquid particle has a definite path and their paths do not cross each other is called
Correct : B. Streamline flow
48. The magnitude of water hammer depends upon the
Correct : D. All of the above
49. The fluid forces considered in the Navier Stokes equation are
Correct : A. Gravity, pressure and viscous
50. Cavitation is caused by
Correct : D. Low pressure
51. A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. The total pressure on the wall acts at a distance __________ from the liquid surface.
Correct : C. 2H/3
52. An ideal flow of any fluid must fulfill the following
Correct : D. Continuity equation
53. The flow in a pipe or channel is said to be uniform when
Correct : A. The liquid particles at all sections have the same velocities
54. Surface tension
Correct : A. Acts in the plane of the interface normal to any line in the surface
55. Select the wrong statement
Correct : D. The diameter of an equivalent pipe is equal to that of a compound pipe
56. manometers because
Alcohol is used in
Correct : D. It can provide longer column due to low density
57. If no resistance is encountered by displacement, such a substance is known as
Correct : D. Ideal fluid
58. The kinematic viscosity is the
Correct : A. Ratio of absolute viscosity to the density of the liquid
59. The viscosity of water is __________ than that of mercury.
Correct : A. Higher
60. Surface energy per unit area of a surface is numerically equal to
Correct : B. Surface tension
61. The specific weight of sea water is __________ that of pure water.
Correct : C. More than
62. Which of the following instruments is used to measure flow on the application of Bernoulli's theorem?
Correct : D. All of the above
63. The depth of the centre 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
Correct : B. 3.0 m
64. An internal mouthpiece is said to be running free if the length of the mouthpiece is __________
the diameter of the orifice.
Correct : C. Less than three times
65. An ideal flow of any fluid must satisfy
Correct : D. Continuity equation
66. The height of a water column equivalent to a pressure of 0.15 MPa is
Correct : A. 15.3 m
67. The region between the separation streamline and the boundary surface of the solid body is
known as
Correct : A. Wake
68. 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
69. 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
70. 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
71. The total head of a liquid particle in motion is equal to
Correct : A. Pressure head + kinetic head + potential head
72. Free surface of a liquid tends to contract to the smallest possible area due to force of
Correct : A. Surface tension
73. The Metacentric heights of two floating bodies A and B are 1 m and 1.5 m respectively. Select the
correct statement.
Correct : C. The body B is more stable than body A
74. The rise or depression of liquid in a tube due to surface tension will increase in size of tube will
Correct : D. Decrease
75. The total pressure on a horizontally immersed surface is (where w = Specific weight of the liquid, A = Area of the immersed surface, and x = Depth of the centre of gravity of the immersed surface from the liquid surface)
Correct : C. wAx
76. The discharge of a depressed nappe is 6 to 7 percent __________ that of a free nappe.
Correct : B. More than
77. The line of action of the buoyant force acts through the Centroid of the
Correct : D. Displaced volume of the fluid
78. The intensity of pressure at any point, in a liquid, is
Correct : B. Directly proportional to the depth of liquid from the surface
79. During the opening of a valve in a pipe line, the flow is
Correct : B. Unsteady
80. A manometer is used to measure
Correct : B. Pressure in pipes and channels
81. For hypersonic flow, the Mach number is
Correct : D. Greater than 4
82. The theoretical velocity of jet at vena contracta is (where H = Head of water at vena contracta)
Correct : D. 2gh)
83. For pipes, laminar flow occurs when Reynolds number is
Correct : A. Less than 2000
84. When the flow in an open channel is gradually varied, the flow is said to be
Correct : B. Steady non-uniform flow
85. In an internal mouthpiece, if the jet after contraction does not touch the sides of the mouthpiece, then
the mouthpiece is said to be
Correct : B. Running free
86. The units of kinematic viscosity are
Correct : A. Metres² per sec
87. The length of a liquid stream while flowing over a weir __________ at the ends of the sill.
Correct : C. Contracts
88. Newton's law of viscosity is a relationship between
Correct : A. Shear stress and the rate of angular distortion
89. The total energy line lies over the hydraulic gradient line by an amount equal to the
Correct : B. Velocity head
90. Choose the wrong statement
Correct : D. The vertical component passes through the center of pressure of the volume
91. In open channels, the specific energy is the
Correct : B. Total energy measured with respect to the datum passing through the bottom of the channel
92. For a floating body to be in stable equilibrium, its metacentre should be
Correct : D. Above the center of gravity
93. A water tank contains 1.3 m deep water. The pressure exerted by the water per metre length of the tank is
Correct : B. 8.29 kN
94. Total pressure on a lmxlm gate immersed vertically at a depth of 2 m below the free water surface
will be
Correct : A. 1000 kg
95. If a body floating in a liquid 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 __________ equilibrium.
Correct : A. Neutral
96. A streamline is defined as the line
Correct : C. Of equal velocity in a flow
97. The flow in a pipe or channel is said to be non-uniform when
Correct : B. The liquid particles at different sections have different velocities
98. Hydrometer is used to determine
Correct : A. Specific gravity of liquids
99. The dynamic viscosity of the liquid __________ with rise in temperature.
Correct : C. Decreases
100. For pipes, turbulent flow occurs when Reynolds number is