1. The branch of Engineering-science, which deals with water at rest or in motion is called
Correct : A. hydraulics
2. A solid can resist which of the following stresses?
Correct : D. All of the above.
3. .......... possesses no definite volume and is compressible.
Correct : C. Gas
4. The ratio of the specific weight of the liquid to the specific weight of a standard fluid is known as
Correct : C. Specific gravity
5. The property of a fluid which determines its resistance to shearing stress is called
Correct : A. Viscosity
6. Fluids which do not follow the linear relationship between shear stress and rate of deformation are termed
as.... fluids.
Correct : B. Non-Newtonian
7. The printer’s ink is an example of
Correct : C. Thixotropic substance
8. The viscosity of liquids ..... with increase in temperature.
Correct : A. Decreases
9. Surface tension is caused by the force of ..... at the free surface.
Correct : A. Cohesion
10. Which of the following is an example of phenomenon of surface tension?
Correct : D. All of the above.
11. Surface tension is expressed in
Correct : A. N/m
12. Pressure inside a water droplet is given by the relation
Correct : A. p = 4𝜎/d
13. . ...... is a phenomenon by which a liquid rises into a thin glass tube above or below its general level.
Correct : B. Capillarity
14. The capillary rise of water in the glass tube is given by
Correct : C. h = 4σ/wd
15. Elasticity of fluids is measured in terms of
Correct : C. Bulk modulus of elasticity
16. Compressibility is the reciprocal of
Correct : A. Bulk modulus of elasticity
17. Bulk modulus of elasticity is the ratio of
Correct : C. Compressive stress to volumetric strain
18. The value of bulk modulus of elasticity .......... with increase of pressure.
Correct : A. Increases
19. The pressure of a liquid on a surface will always act ...... to the surface.
Correct : B. Normal
20. The pressure ....... as the depth of the liquid increases.
Correct : A. Increases
21. The intensity of pressure in a liquid due to its depth will vary .... with depth.
Correct : A. Directly
22. The height of the free surface above any point is known as
Correct : A. Static head
23. “The intensity of pressure at any point in a liquid at rest is the same in all directions.” The above statement
is known as
Correct : B. Pascal’s law
24. Any pressure measured above the absolute zero of pressure is termed as
Correct : C. Either of the above
25. The fundamental S.I. unit of pressure is N/m2; this is also known as ......
Correct : A. Pascal
26. The intensity of pressure p is related to specific weight w of the liquid and vertical depth h of the point
by the equation
Correct : A. p = wh
27. The point of application of the total pressure on the surface is
Correct : B. Centre of pressure
28. If A is the area of the immersed surface, w is the specific weight of the liquid and ͞x is the depth of
horizontal surface from the liquid surface, then the total pressure P on the surface is given by
Correct : C. p = wA ͞x
29. The side of the dam to which the water from the river or the stream approaches is known as
Correct : B. Upstream
30. Lock gates are provided to
Correct : A. Change the water level in a canal or river for irrigation
31. The term........ means the study of pressure exerted by a fluid at rest.
Correct : A. Hydrostatics
32. The tendency for an immersed body to be lifted up in the fluid, due to an upward force opposite to the
action of gravity is known as
Correct : A. Buoyancy
33. The magnitude of the buoyant force can be determined by
Correct : B. Archimedes’ principle
34. When a body is immersed in a fluid, partially or completely, the force of buoyancy is equal to
Correct : B. The weight of the fluid displaced by the body
35. The point of application of the force of buoyancy on the body is known as
Correct : B. Centre of buoyancy
36. “When a body is immersed in a fluid either wholly or partially, it is buoyed or lifted up by a force which is equal to the weight of fluid displaced by the body”. This principle was enunciated by
Correct : A. Archimedes
37. A floating body is in stable equilibrium when
Correct : B. The metacentre is above its centre of gravity
38. An ice-cube is floating in glass of water. As the cube melts the water level
Correct : B. Falls
39. Metacentric height can be determined by
Correct : C. Both (a) and (b)
40. If a body does not return to its original position from the slightly displaced angular position and heels farther away, when given a small angular displacement; such an equilibrium is called
Correct : B. Unstable equilibrium
41. The motion of fluid particles may be described by which of the following methods?
Correct : C. Both (a) and (b)
42. In which of the following methods, the observer concentrates on a point in the fluid system?
Correct : D. None of the above.
43. Normal acceleration in fluid-flow situation exists only when
Correct : B. The flow is two-dimensional
44. In a steady flow the velocity
Correct : B. At a given point does not change with time
45. The flow in a pipe whose valve is being opened or closed gradually is an example of
Correct : B. Unsteady flow
46. The type of flow in which the velocity at any given time does not change with respect to space is called
Correct : C. Uniform flow
47. Flow in a pipe where average flow parameters are considered for analysis is an example of
Correct : B. One-dimensional flow
48. The flow in a river during the period of heavy rainfall is
Correct : D. Unsteady, non-uniform and three-dimensional.
49. Flow between parallel plates of infinite extent is an example of
Correct : B. Two-dimensional flow
50. If the flow is irrational as well as steady it is known as
Correct : C. Potential flow
51. High velocity flow in a conduit of large size is known as
Correct : B. Turbulent flow
52. If the Reynolds number is less than 2000, the flow in a pipe is
Correct : A. Laminar flow
53. The path followed by fluid particle in motion is called a
Correct : B. Path line
54. A....is an imaginary line within the flow so that the tangent at any point on it indicates the velocity at that
point.
Correct : B. Stream line
55. A stream line is one
Correct : B. In which the flow cannot cross the bounding surface
56. ...... is a curve which gives an instantaneous picture of the location of the fluid particles which have passed
through a given point.
Correct : C. Streak line
57. In fluid mechanics, the continuity equation is a mathematical statement embodying the principle of
Correct : B. Conservation of mass
58. An irrational flow is one in which
Correct : C. The net rotation of fluid particles about their mass centres remains zero
59. In a fluid-flow the stream lines are lines
Correct : B. Along which the stream function ψ = constant
60. ....... is defined mathematically as the line integral of the tangential velocity about a closed path (contour).
Correct : A. Circulation
61. The concept of stream function which is based on the principle of continuity is applicable to
Correct : B. Two-dimensional flow only
62. The motion is described as ......when the components of rotation or vorticity are zero throughout certain point of the fluid.
Correct : B. Irrotational
63. ........ is defined as a scalar function of space and time such that its negative derivative with respect to any direction gives the fluid velocity in that direction.
Correct : A. Velocity potential function
64. If velocity potential (φ) satisfies the Laplace equation, it represents the possible..... flow.
Correct : D. Steady, incompressible, irrotational.
65. A flow net is a graphical representation of strea lines and equipotential lines such that these lines
Correct : A. Intersect each other orthogonally forming curvilinear squares
66. Velocity head is given by
Correct : B. V2/2g
67. Euler’s equation (in differential form) is written as:
Correct : B. dp/ρ + v.dv + g.dz = 0
68. In which of the following measuring devices Bernoulli’s equation is used:
Correct : D. All the above.
69. The co-efficient of discharge of an orificemeter is ......that of a venturimeter.
Correct : B. Much smaller than
70. The piezometric head is the summation of :
Correct : B. Pressure head and elevation head
71. The total-energy-line in pipe flow is a graphical representation of the Bernoulli’s equation and represents
the sum of velocity head, pressure head and the elevation head above:
Correct : B. The arbitrary horizontal datum
72. The total energy represented by the Bernoulli’s equation (p/ρg +V2/2g +z) has the units:
Correct : D. Nm/N.
73. The Bernoulli’s equation written in the conventional form p/ρg + V2/2g + z = constant total energy per unit of certain quantity. Identify this quantity from the choices given below:
Correct : B. Energy per unit weight
74. A venturimeter is used for measuring:
Correct : B. Flow rate
75. The co-efficient of discharge (Cd) of venturimeter lies within the limits:
Correct : A. 0.95 to 0.99
76. A Pitot-tube is used for measuring:
Correct : A. Velocity of flow
77. When a Pitot-tube is put to use it must be ensured that its alignment is such that:
Correct : C. Its opening faces upstream and the horizontal leg is perfectly aligned with the direction of flow
78. The hydraulic gradient-line indicates the variation of which of the following:
Correct : B. Piezometric head in the direction of flow
79. The momentum correction factor β is used to account for:
Correct : C. Non-uniform distribution of velocities at inlet and outlet sections
80. The change in moment of momentum of fluid due to flow along a curved path results in:
Correct : B. Torque
81. Which of the following is an example of free vortex flow?
Correct : D. All of the above.
82. In case of forced vortex, the rise of liquid level at the ends is .... the fall of liquid level at the axis of rotation.
Correct : C. Equal to
83. In case of a closed cylindrical vessel sealed at the top and the bottom the volume of air before rotation is ...... the volume of air after:
Correct : C. Equal to
84. Dimensional analysis is used to
Correct : D. All of the above.
85. Which of the following is an advantage of dimensional analysis?
Correct : D. All of the above.
86. dimensionally homogeneous equation is applicable to
Correct : D. All systems of units.
87. In which of the following methods of dimensional analysis, a functional relationship of some variables is expressed in the form of an exponential equation, which must be dimensionally homogeneous?
Correct : B. Rayleigh’s method
88. In dimensional analysis the Buckingham’s π–theorem is widely used and expresses the resulting equation in terms of
Correct : C. (n – m) dimensionless parameters
89. To apply Buckingham’s π–theorem, m repeating variables are selected from amongst the n variables influencing the phenomenon. The repeating variables are selected such that they
Correct : C. In combination contain each of the m fundamental dimensions involved in the problem.
90. In order that results obtained in model studies correctly represent the behaviour of the prototype, which of the following similarities must be ensured between the model and the prototype?
Correct : D. All of the above.
91. Dynamic similarity between the model and prototype is the
Correct : C. Similarity of forces
92. ...... is equal to the product of shear stress due to viscosity and surface area of flow.
Correct : A. Viscous force
93. Kinematic similarity between model and prototype is the
Correct : C. Similarity of streamline pattern
94. ......... is the ratio of the inertia force to the viscous force.
Correct : C. Reynolds number
95. ........ is the square root of the ratio of the inertia force to the pressure force.
Correct : C. Euler’s number
96. Euler number is important in which of the following flow situations?
Correct : D. All of the above
97. Mach’s number is defined as the square root of the ratio of the
Correct : C. Inertia force to the elastic force
98. ...... is important in compressible fluid flow problems at high velocities, such as high velocity flow in pipes or motion of high-speed projectiles and missiles.
Correct : B. Mach’s number
99. Distorted models are required to be prepared for which of the following?