1. Whenever a plate is held immersed at some angle with the direction of flow of the liquid, it is subjected to some pressure. The component of this pressure, in the direction of flow of the liquid, is known as
Correct : B. Drag
2. Which of the following is dimensionless?
Correct : D. Specific gravity
3. Coefficient of resistance is the ratio of
Correct : C. Loss of head in the orifice to the head of water available at the exit of the orifice
4. Mercury does not wet glass. This is due to property of liquid known as
Correct : C. Surface tension
5. A flow in which __________ force is dominating over the viscosity is called turbulent flow.
Correct : D. Inertia
6. Specific weight of sea water is more that of pure water because it contains
Correct : D. All of the above
7. In an internal mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to height of the liquid above the vena contracta.
Correct : A. Less than
8. 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
Correct : D. 0.75
9. The factional resistance of a pipe varies approximately with __________ of the liquid.
Correct : C. Square of velocity
10. For measuring flow by a Venturimeter, if should be installed in
Correct : D. In any direction and in any location
11. The ratio of the inertia force to the elastic force is called
Correct : D. Mach number
12. All the terms of energy in Bernoulli's equation have dimension of
Correct : D. Length
13. The pressure at a point 4 m below the free surface of water is
Correct : C. 39.24 kPa
14. Specific weight of water in S.I. units is equal to
Correct : C. 9.81 × 103 N/m3
15. In an external mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to 0.89 times the height of the liquid, above the vena contracta.
Correct : A. Less than
16. Poise is the unit of
Correct : C. Viscosity
17. Viscous force is the __________ of shear stress due to viscosity and cross-section area of flow.
Correct : C. Product
18. The siphon will work satisfactorily, if the minimum pressure in the pipe is __________ vapour pressure of liquid.
Correct : C. More than
19. The tangential velocity of the water element having a free vortex is
Correct : B. Inversely proportional to its distance from the centre
20. The horizontal component of buoyant force is
Correct : C. Zero
21. A flow in which the quantity of liquid flowing per second is constant, is called __________ flow.
Correct : A. Steady
22. The divergent portion of a Venturimeter is made longer than convergent portion in order to
Correct : C. Both (A) and (B)
23. According to Chezy's formula, the discharge through an open channel is (where A = Area of flow, C =
Chezy's constant, m = Hydraulic mean depth, and i = Uniform slope in bed)
Correct : C. AC × m × i)
24. In a free vortex motion, the radial component of velocity everywhere is
Correct : C. Zero
25. Coefficient of contraction is the ratio of
Correct : D. Area of jet at vena-contracta to the area of orifice
26. The Bernoulli's equation is based on the assumption that
Correct : D. All of the above
27. The flow in a pipe is turbulent when Reynold number is
Correct : C. More than 2800
28. When the flow parameters at any given instant remain same at every point, then flow is said to be
Correct : D. Uniform
29. Rain drops are spherical because of
Correct : C. Surface tension forces
30. The discharge over the trapezoidal notch is equal to the discharge over the rectangular notch __________ the discharge over the triangular notch.
Correct : A. Plus
31. The sheet of water flowing over a notch or a weir is known as
Correct : B. Nappe or vein
32. A structure used to dam up a stream or river over which the water flows is called
Correct : C. Weir
33. A body floating in a liquid is said to be in neutral equilibrium, if its metacentre
Correct : A. Coincides with its centre of gravity
34. General energy equation holds for
Correct : D. Non-uniform flow
35. The buoyancy depends on
Correct : A. Mass of liquid displaced
36. The centre of gravity of the volume of the liquid displaced is called
Correct : B. Centre of buoyancy
37. The Reynold's number of a ship is __________ to its velocity and length.
Correct : A. Directly proportional
38. In the above question, if the angular velocity ? is doubled, then the depth of parabola will be
Correct : C. four times
39. The total pressure on the top of a closed cylindrical vessel competely filled up with a liquid is
Correct : C. directly proportional to (radius)4
40. The discharge over the trapezoidal notch is equal to the discharge over the rectangular notch
Correct : A. plus
41. The coefficient of discharge for an external mouthpiece is
Correct : D. 0.855
42. A fluid having no viscosity is known as
Correct : B. ideal fluid
43. A wwir is said to be broad crested weir. If the width of the crest of the weir is
Correct : C. more than
44. The velocity through a channel of circular section will be maximum when the depth of water is
Correct : C. 0.81 times
45. The pressure of the liquid flowing through the divergent portion of a venturimeter
Correct : C. decreases
46. An error of 1% in measureing head over the crest of the notch (H) will produce an error of
Correct : B. 1.50%
47. In a broad-crested weir, the discharge is maximum if the head of water on the downstream side of weir is
Correct : C. two-third
48. To force present in a moving liquid is
Correct : D. all of these
49. If an incompressible liquid is continuously flowing through a pipe, the quantity of liquid passing per second is different at different sections.
Correct : B. False
50. Which of the following is an example of maninar flow?
Correct : D. all of these
51. When a body is placed over a liquid, it will sink down if
Correct : C. gravitational force is more than the upthrust of the liquid
52. The pressure of air
Correct : B. decreases
53. If the coefficient of discharge is 0.6, then the discharge over a right angled notch is
Correct : B. 1.417 H5/2
54. The velocity corresponding to Reynold number of 2000 is called
Correct : C. lower critical velocity
55. The unit of surface tension is
Correct : A. N / m
56. The velocity at which the turbulent flow starts is known as higher critical velocity.
Correct : A. Yes
57. In order to measure the flow with a venturimeter, it is installed in
Correct : D. any direction and in any location
58. The shear stress-strain graph for a non-newtonian fluid is a curve.
Correct : A. Correct
59. The velocity of liquid flowing through an orifice varies with the available head of the liquid.
Correct : A. Agree
60. The D-Alembert's principle is used for changing the dynamic equilibrium of a fluid mass, into a static equilibrium.
Correct : A. Agree
61. When the Mach number is between
Correct : D. 1 and 6
62. The hoss of hed due to an obstruction in a pipe is twice the loss of head at its entrance.
Correct : A. Agree
63. The dynamic viscosity of gases
Correct : B. increases
64. A fluid whose viscosity does not change with the rate of deformation or shear strain is known as
Correct : C. newtonian fluid
65. If a body floating in a liquid returns back to its original position, when given a small angular displacement, the body is said to be in
Correct : B. stable equilibrium
66. The property of a liquid which controls its rate of flow is called viscosity.
Correct : A. True
67. Reyold's number is the ratio of the inertia force to the
Correct : B. viscous force
68. When the end contractions of the weir are suppressed, then number of end contractions (n) are taken as zero
Correct : A. Agree
69. The specific gravity has no units.
Correct : A. Agree
70. A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. Which of the following statement is correct?
Correct : C. The pressure on the wall at the liquid level is zero, and on the bottom of the wall is maximum
71. The stability of a dam is checked for
Correct : D. all of these
72. The centre of buoyancy is the centre of area of the immersed body.
Correct : A. Correct
73. The shear stress between the two liquid layers is
Correct : B. indirectly
74. The kinematic viscosity of an oil (in stokes) whose specific gravity is 0.95 and viscosity 0.011 poise, is
Correct : A. 0.0116 stoke
75. A nozzle placed at the end of a water pipe line discharges water at a
Correct : D. high velocity
76. Bernoulli's equation is applied to
Correct : D. all of these
77. The flow in a pipe is laminar, when Reynold number is less than 2000.
Correct : A. True
78. Select the wrong statement
Correct : D. Weber's number is the ratio of inertia force to surface tension force.
79. A vessel of 4 m3 contains an oil which weighs 30 kN. The specific weight of the oil is
Correct : C. 7.5 kN / m3
80. The quantity of a liquid flowing per second through a section of a pipe or a channel is called discharge and is measured in cumecs (m3/s).
Correct : A. True
81. Water is
Correct : B. an incompressible
82. The specific weight of sea water is
Correct : C. more than
83. The separation of flow occurs when the hydrodynamic boundary layer thickness is reduced to zero.
Correct : A. Agree
84. The specific weight of compressible fluids does not remain constant.
Correct : A. True
85. An internal mouthpiece is said to be runing
Correct : C. full
86. Turbulent flow takes place at high velocities.
Correct : A. Agree
87. The property of a liquid which offers resistance to the movement of one layer of liquid over another adjacent layer of liquid, is called
Correct : D. viscosity
88. The ratio of the inertia force to the surface tension force is called Weber's number.
Correct : A. Correct
89. A venturiflume is used to measure
Correct : B. discharge of liquid
90. A fluid whose viscosity changes with the rate of deformation or shear strain is known as non-newtonian fluid.
Correct : A. True
91. Falling drops of water become spheres due to the property of
Correct : A. surface tension of water
92. A flow in which the quantity of liquid flowing per second is not constant, is called
Correct : D. unsteady flow
93. A flow whose streamline is represented by a straight line, is called
Correct : A. one
94. The rise of liquid along the walls of a revolving cylinder about the initial level is
Correct : A. same as
95. A nirform 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
96. A point, in a compressible flow where the velocity of fluid is zero, is called
Correct : C. stagnation point
97. The coefficient of viscosity may be determined by
Correct : D. all of these
98. Coefficient of contraction is the ratio of
Correct : D. area of jet at vena contracta to the area of orifice
99. In an external or internal mouthpiece, the absolute pressure head at vena contracta is zero when atmospheric pressure head is 10.3 m of water.
Correct : A. Correct
100. When the pressure intensity at a point is less than the local atmospheric pressure, then the difference of these two pressures is called vacuum pressure.