1. The velocity of the liquid flowing through the divergent portion of a Venturimeter
Correct : C. Decreases
2. The volumetric change of the fluid caused by a resistance is known as
Correct : C. Compressibility
3. If the depth of water in an open channel is less than the critical depth, the flow is called
Correct : D. Torrential flow
4. Choose the wrong statement
Correct : D. When in equilibrium, fluids can sustain shear forces
5. An orifice is said to be large, if
Correct : D. The available head of liquid is less than 5 times the height of orifice
6. 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
7. The centre of pressure acts __________ the centre of gravity of immersed surface.
Correct : C. Below
8. Dynamic viscosity of most of the liquids with rise in temperature
Correct : B. Decreases
9. The discharge over a right angled notch is (where H = Height of liquid above the apex of notch)
Correct : D. (8/15) Cd. 2g. H5/2
10. A square surface 3 m × 3 m lies in a vertical line in water pipe its upper edge at water surface. The hydrostatic force on square surface is
Correct : B. 13,500 kg
11. Select the correct statement
Correct : B. Standard atmospheric pressure is the mean local atmospheric pressure a* sea level
12. The shear stress-strain graph for a Newtonian fluid is a
Correct : A. Straight line
13. 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
14. Uniform flow occurs when
Correct : C. The magnitude and direction of the velocity do not change from point to point in the fluid
15. At the center line of a pipe flowing under pressure where the velocity gradient is zero, the shear stress will be
Correct : D. Could be any value
16. The discharge through a channel of trapezoidal section is maximum when
Correct : C. The sloping side is equal to half the width at the top
17. Piezometer is used to measure
Correct : C. Very low pressures
18. The point at which the resultant pressure on an immersed surface acts, is known as
Correct : C. Centre of pressure
19. Choose the wrong statement
Correct : D. Center of buoyancy is located above the center of gravity of the displaced liquid
20. The pressure in the air space above an oil (sp. gr. 0.8) surface in a tank is 0.1 kg/cm". The pressure at 2.5 m below the oil surface will be
Correct : B. 3 metres of water column
21. The total pressure on the top of a closed cylindrical vessel completely filled up with a liquid is
Correct : C. Directly proportional to (radius)4
22. The flow which neglects changes in a transverse direction is known as
Correct : A. One dimensional flow
23. The mass per unit volume of a liquid at a standard temperature and pressure is called
Correct : B. Mass density
24. A large Reynold number is indication of
Correct : D. Highly turbulent flow
25. Which of the following statement is wrong?
Correct : C. The length of divergent portion in a Venturimeter is equal to the convergent portion.
26. A weir is said to be broad crested weir, if the width of the crest of the weir is ________ half the height of water above the weir crest.
Correct : C. More than
27. The bulk modulus of elasticity
Correct : B. Increases with pressure
28. Kinematic viscosity is equal to
Correct : A. Dynamic viscosity/density
29. The atmospheric pressure at sea level is
Correct : D. All of these
30. The conditions for the stable equilibrium of a floating body are
Correct : D. All the above are correct
31. A glass tube of smaller diameter is used while performing an experiment for the capillary rise of water because
Correct : A. It is easier to see through the glass tube
32. To avoid an interruption in the flow of a siphon, an air vessel is provided
Correct : C. At the summit
33. When the coefficient of discharge (Cd) is 0.623, then the general equation for discharge over a rectangular weir is
Correct : A. 1.84(L - 0.1nH)H3/2
34. In an isothermal atmosphere, the pressure
Correct : C. Varies in the same way as the density
35. If the atmospheric pressure on the surface of an oil tank (sp. gr. 0.8) is 0.2 kg/cm", the pressure at a depth of 50 m below the oil surface will be
Correct : D. 6 meters of water Column
36. The pressure intensity in kN/m2 (or kPa) at any point in a liquid is (where w = Specific weight of liquid, and h = Depth of liquid from the surface)
Correct : B. wh
37. 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
Correct : C. Archimedes' principle
38. The liquid used in manometers should have
Correct : D. High surface tension
39. Which of the following instrument can be used for measuring speed of an aeroplane?
Correct : C. Pitot tube
40. A jet of water discharging from a 40 mm diameter orifice has a diameter of 32 mm at its vena contracta. The coefficient of contraction is
Correct : B. 0.64
41. Buoyant force is
Correct : D. The resultant force on a body due to the fluid surrounding it
42. In case of flow through parallel pipes,
Correct : D. Both (A) and (B)
43. Rotameter is a device used to measure
Correct : C. Flow
44. In a broad-crested weir, the discharge is maximum if the head of water on the downstream side of weir is __________ the head of water on the upstream side of weir.
Correct : C. Two-third
45. When a body, floating in a liquid, is given a small angular displacement, it starts oscillating about a point known as
Correct : D. Metacentre
46. A nozzle is generally made of
Correct : B. Convergent shape
47. Pitot tube is used for measurement of
Correct : C. Velocity
48. The value of mass density in kg-sec-V-
Correct : D. 101.9
49. The shear stress between the two liquid layers is __________ proportional to the distance
between two layers.
Correct : B. Inversely
50. Viscosity of water in comparison to mercury is
Correct : A. Higher
51. The power transmitted through the pipe is maximum when the head lost due to friction is equal to
Correct : B. One-third of the total supply head
52. Falling drops of water become spheres due to the property of
Correct : C. Surface tension
53. The difference of pressure between the inside and outside of a liquid drop is
Correct : D. p = 2T/r
54. A venturi -flume is used to measure
Correct : B. Discharge of liquid
55. Working principle of dead weight pressure gauge tester is based on
Correct : A. Pascal's law
56. The meatcentric height of a ship is 0.6 m and the radius of gyration is 4 m. The time of rolling of a
ship is
Correct : C. 10.4 s
57. The discharge through a channel of rectangular section will be maximum, if
Correct : B. Its breadth is twice the depth
58. The discharge through a channel of circular section will be maximum when the depth of water is __________ the diameter of the circular channel.
Correct : D. 0.95 times
59. Uniform flow occurs when
Correct : C. Size and shape of the cross section in a particular length remain constant
60. Bulk modulus of a fluid is the ratio of
Correct : C. Increase in pressure to the volumetric strain
61. An average value of coefficient of velocity is
Correct : D. 0.97
62. A liquid would wet the solid, if adhesion forces as compared to cohesion forces are
Correct : B. More
63. When a cylindrical vessel containing liquid is revolved about its vertical axis at a constant angular
velocity, the pressure
Correct : A. Varies as the square of the radial distance
64. Which of the following is the unit of kinematic viscosity?
Correct : C. Stoke
65. Reynold's number is the ratio of the inertia force to the
Correct : B. Viscous force
66. A piece weighing 3 kg in air was found to weigh 2.5 kg when submerged in water. Its specific gravity is
Correct : D. 6
67. A differential manometer is used to measure
Correct : D. Difference of pressures between two points in a pipe
68. In a venturi-flume, the flow takes place at
Correct : A. Atmospheric pressure
69. The normal stress is same in all directions at a point in a fluid
Correct : C. When there is no motion of one fluid layer relative to an adjacent layer
70. The highest efficiency is obtained with a channel of __________ section.
Correct : D. Trapezoidal
71. 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 per unit length is (where w = Specific weight of liquid, and H = Height of liquid)
Correct : C. wH2/2
72. Which of the following manometer has highest sensitivity?
Correct : D. Micro-manometer with water
73. The velocity corresponding to Reynold number of 2800, is called
Correct : D. Higher critical velocity
74. For a floating body to be in equilibrium
Correct : D. All of the above
75. When an internal mouthpiece is running free, the discharge through the mouthpiece is (where a = Area of mouthpiece, and H = Height of liquid above the mouthpiece)
Correct : A. 0.5 a. gH
76. A uniform body 3 m long, 2 m wide and 1 m deep floats in water. If the depth of immersion is 0.6
m, then the weight of the body is
Correct : C. 35.3 kN
77. The force per unit length is the unit of
Correct : A. Surface tension
78. When the Mach number is more than 6, the flow is called
Correct : D. Hyper-sonic flow
79. The upper surface of a weir over which water flows is known is
Correct : C. Sill
80. One cubic metre of water weighs
Correct : D. 1000 litres
81. Kinematic viscosity is dependent upon
Correct : C. Density
82. The discharge through a large rectangular orifice is given by (where H1 = Height of the liquid above the top of the orifice, H2 = Height of the liquid above the bottom of the orifice, b = Breadth of the orifice, and Cd = Coefficient of discharge)
Correct : C. Q = (2/3) Cd × b × (2g) × (H2 3/2 - H1 3/2)
83. An error of 1% in measuring head over the apex of the notch (H) will produce an error of _________ in discharge over a triangular notch.
Correct : D. 2.5 %
84. The Euler's equation for the motion of liquids is based upon the assumption that
Correct : D. All of the above
85. The ratio of the inertia force to the viscous force is called
Correct : A. Reynold's number
86. The total energy of a liquid particle in motion is equal to
Correct : A. Pressure energy + kinetic energy + potential energy
87. Which of the following instrument can be used for measuring speed of a submarine moving in deep sea?
Correct : D. Pitot tube
88. The force present in a moving liquid is
Correct : D. All of these
89. 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
90. The flow in which the velocity vector is identical in magnitude and direction at every point, for any
given instant, is known as
Correct : B. Uniform flow
91. The coefficient of discharge for an external mouthpiece depends upon
Correct : D. Length of mouthpiece
92. The specific weight of water is 1000 kg/m3
Correct : D. All the above
93. If the depth of water in an open channel is greater than the critical depth, the flow is called
Correct : C. Tranquil flow
94. When a cylindrical vessel, containing some liquid, is rotated about its vertical axis, the liquid surface is depressed down at the axis of its rotation and rises up near the walls of the vessel on all sides. This type of flow is known as
Correct : C. Vortex flow
95. The body will sink down if the force of buoyancy is __________ the weight of the liquid displaced.
Correct : B. Less than
96. The total pressure on the surface of a vertical sluice gate 2 m x 1 m with its top 2 m surface being 0.5 m below the water level will be
Correct : D. 2000 kg
97. The velocity at which the laminar flow stops, is known as
Correct : B. Lower critical velocity
98. The line of action of the buoyant force acts through the
Correct : D. Centroid of the displaced volume of fluid
99. The buoyancy depends upon the
Correct : A. Weight of the liquid displaced
100. Two dimensional flows occurs when
Correct : D. The fluid particles move in plane or parallel planes and the streamline patterns are identical in each plane