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Chapter 6
Fluid Dynamics
Encircle the most appropriate answer among the following options
1 The fractional effect between different layers of a flowing fluid is known as choose which one is correct:
(a) Viscosity of fluid
(b) Velocity of fluid
(c) Displacement of the fluid
(d) Acceleration of the fluid
2. The force required to slide one layer of the liquid over another layer is measured by choose which one is correct:
(a) Acceleration
(b) Viscosity
(c) Momentum
(d) Velocity
3. An object moving through a fluid experience a retarding force is called choose which one is correct:
(a) Centripetal force
(b) Horizontal force
(c) Drag force
(d) Gravitational force
4. The study of the properties of fluid at rest is called choose which one is correct:
(a) Viscosity
(b) Fluid dynamic
(c) Fluid static
(d) Friction
5. The study of properties of fluids in motion is called choose which one is correct:
(a) Viscosity
(b) Fluid dynamics
(c) Fluid static
(d) Friction
6. Drag force between two layers under consideration depends upon choose which one is correct:
(a) Distance between the layers
(b) Relative velocity
(c) Surface area of layer
(d) All Of these
7. The drag force between different layers of the liquid is given by choose which one is correct:
(a) Fd = 6
(b) Fd =
(c) Fd =
(d) None of these
8. Stoke’s law holds for choose which one is correct:
(a) Cylindrical bodies
(b) Cubical bodies
(c) Spherical bodies
(d) None of these
9. According to Stoke’s law, drag force depends on choose which one is correct:
(a) Coefficient of viscosity
(b) Terminal velocity
(c) Radius of the spherical body
(d) All of these
10. The drag force increases as the speed of particle choose which one is correct:
(a) Increases
(b) Decreases
(c) Remains constant
(d) None of these
11 The drag force Fd on a sphere of radius r moving slowly with speed V through the fluid of viscosity is given by choose which one is correct:
(a) 4
(b) 6
(c) 2
(d) 3
12. The word fluid means choose which one is correct:
(a) To fall
(b) To rise
(c) To flow
(d) None of these
13. Stokes law obey only choose which one is correct:
(a) Ideal fluid
(b) Viscous fluid
(c) Perfect fluid
(d) Non-ideal fluid
14 The formula Fd = 6 is derived by choose which one is correct:
(a) Einstein
(b) Newton
(c) Sadi Carnot
(d) Stoke
15. Due to increase in temperature, the viscosity of the fluid choose which one is correct:
(a) Increases
(b) Decreases
(c) Remains constant
(d) Becomes double
16. The dimensions of coefficient of viscosity are choose which one is correct:
(a) [ML-1 V-2]
(b) [ML2T-I]
(c) [ML-I T-I]
(d) None of these
17. Viscosity of the gases with rise in temp choose which one is correct:
(a) Increases
(b) Decreases
(c) Remains constant
(d) None of these
18. Which one of the following is most viscous choose which one is correct:
(a) Glycerine
(b) Coal Tar
(c) Honey
(d) None of these
19. The SI unit of coefficient of viscosity is choose which one is correct:
(a) kg m-l s-1
(b) Nm2s2
(c) kg m2s2
(d) kg ms-2
20. Internal friction of a fluid is called choose which one is correct:
(a) Surface tension
(b) Resistance
(c) Viscosity
(d) None of these
21. When the magnitude of the drag force becomes equal to the weight, the net force acting on the droplet will be choose which one is correct:
(a) Zero
(b) Maximum
(c) Remains the same
(d) None of these
22. The drag force increases as the speed of the object choose which one is correct:
(a) Decreases
(b) Increases
(c) Remains constant
(d) None of these
23. The force of friction that comes into action after the motion has started is called choose which one is correct:
(a) Limiting friction
(b) Static friction
(c) Friction
(d) None of these
24. A body of mass m is falling downward in a viscous medium with terminal velocity v, net force on the body is choose which one is correct:
(a) mg
(b) mg – 6
(c) 6 – mg
(d) Zero
25. Viscosity of air is choose which one is correct:
(a) 0.019 x 103 Nsm-2
(b) 0.019 x 10-3N-sm-2
(c) 0.0019 x 10-3 N-sm-2
(d) 0.0019 x 103 N-sm-2
26. The viscosity of water is choose which one is correct:
(a) 0.019 x 10-3 N-sm-2
(b) 0.801 x 10-3 N-sm-2
(c) 6.29 x 10-3 N-sm-2
(d) 0.801 x 103 N-sm-2
27. The viscosity of glycerin is choose which one is correct:
(a) 0.019 x 10-3 Nsm-2
(b) 0.801 x 10-3 Nsm-2
(c) 6.29 x 10-3 N-sm-2
(d) 6.29 x 103 Nsm-2
28. The maximum velocity attained by a spherical droplet when drag force F and the weight Of the droplet becomes equal is called choose which one is correct:
(a) Instantaneous velocity
(b) Terminal velocity
(c) Uniform velocity
(d) None of these
29. The terminal velocity in case of spherical droplet is directly proportional to the choose which one is correct:
(a) Square of the radius
(b) Radius of the droplet
(c) Half of the radius
(d) None of these
30. The terminal velocity of the spherical object is given by choose which one is correct:
(a) vt =
(b) vt =
(c) vt =
(d) None of these 6Tcnr
31. The terminal velocity of water droplet of radius I x 10 m and density 1000 kg/m3 falling through air of viscosity 19 x 10-6 kg/ms is choose which one is correct:
(a) 1.5 m/s
(b) 2.3 m/s
(c) 3.4 m/s
(d) 1.1 m/s
32. The terminal velocity Vt of a sphere of radius r in fluid of viscosity depends upon choose which one is correct:
(a) Radius
(b) Viscosity
(c) Density
(d) All of above
33. If each particle of fluid passing through a point follows the same path, then flow is called choose which one is correct:
(a) Regular flow
(b) Streamline flow
(c) Normal flow
(d) Turbulent flow
34. The irregular flow of the fluids is called choose which one is correct:
(a) Regular flow
(b) Normal flow
(c) Turbulent flow
(d) Streamline flow
35. For the steady flow of incompressible fluid, the equation of continuity is given by choose which one is correct:
(a) A1V1 = A2V2
(b) =
(c) =
(d) A1V1t1= A2V2t2
36. The product of cross-sectional area of the pipe and the fluid speed at any point along the pipe is choose which one is correct:
(a) Zero
(b) Constant
(c) Variable
(d) None of these
37. A fog droplet falls vertically through air with an acceleration choose which one is correct:
(a) Greater than g
(b) Less than g
(c) Equal to g
(d) Equal to zero
38. The formula for continuity is given by the relation choose which one is correct:
(a) P1V2V1 = P2V1V2
(b) P1A1V1 = P2V2A2
(c) P2A2V1 = P 1A1V2
(d) None of these
39. The SI units of flow rate is choose which one is correct:
(a) m2/s2
(b) m3/s
(c) m3/s2
(d) m2/s
40. Bernoullis equation is based upon law of conservation of choose which one is correct:
(a) Momentum
(b) Energy
(c) Mass
(d) All of these
41. The fluid which can be compressible and non-viscous is known as choose which one is correct:
(a) Viscous fluid
(b) Non-ideal fluid
(c) Ideal fluid
(d) Perfect fluid
42. When the velocity of a liquid flowing steadily in a tube increases, its pressure choose which one is correct:
(a) Becomes zero
(b) Remains the same
(c) Increases
(d) Decreases
43. The application of Bernoulli’s theorem is choose which one is correct:
(a) Torricelli’s theorem
(b) Venturi relation
(c) Both (a) and (b)
(d) None of these
44. According to Bernoulli’s theorem, velocity and pressure choose which one is correct:
(a) Are inversely proportional
(b) Are directly proportional
(c) Have no relation
(d) None of these
45. Bernoulli’s equation includes as a special case of choose which one is correct:
(a) Torricelli’s theorem
(b) Stoke’s law
(c) Newton’s laws
(d) None of these
46. When there is no change in pressure at the beginning and end of a flow process, Bernoulli’s equation reduces to choose which one is correct:
(a) V =
(b) P = pgh
(c) P + pv2 = Constant
(d) None of these
47. If the cross-sectional area of the pipe decreases, the speed of the fluid must increases according to choose which one is correct:
(a) Venturi relation
(b) Equation of continuity
(c) Torricelli’s thereom
(d) None of these
48. Bernoulli’s equation is applicable to points flow choose which one is correct:
(a) In a streamline flow
(b) In any non-viscous liquid
(c) In a steady of flowing liquid
(d) None of these
49. The Torricelli’s expression is expressed as choose which one is correct:
(a) V2 =
(b) V2 =
(c) V2 =
(d) None of these
50. The velocity of efflux of a liquid from an orifice is choose which one is correct:
(a)
(b)
(c)
(d)
51. The Venturi relation is given by choose which one is correct:
(a) P1 + P2=pv22
(b) P1 – P2= pV22
(c) P1 – P2 = PV22
(d) PI + P2=äPV22
52. The speed of efflux is equal to the velocity gained by the falling fluid under the action of gravity through a certain height is called choose which one is correct:
(a) Torricell ‘s theorem
(b) Venture’s theorem
(c) Carnot engine
(d) None of these
53. Venturi meter is a device used to measure choose which one is correct:
(a) Viscosity of fluid
(b) Density of fluid
(c) Pressure of fluid
(d) Speed of fluid
54. The fundamental equation in fluid dynamics which relates the pressure with speed fluid and height is choose which one is correct:
(a) Bernoulli’s equation
(b) Equation of continuity
(c) Torricelli’s equation
(d) Venturi equation
55. The Bernoulli’s equation is written as choose which one is correct:
(a) P = = Constant
(b) P + = Constant
(c) P = = Constant
(d) None of these
56. The pressure will be low, where the speed of fluid is choose which one is correct:
(a) High
(b) Low
(c) Zero
(d) Constant
57. At any two points along streamline flow, the sum of the pressure, P.E per unit volume and K.E per unit volume remains constant, this is the statement choose which one is correct:
(a) Equation of continuity
(b) Venturi relation
(c) Terricelli ‘s theorem
(d) Bernoulli ‘s theorem
58. The speed of efflux of liquid is the same as the speed of ball falls through a height of choose which one is correct:
(a) h1 + h2
(b) h2 – h,
(c) h1 – h2
(d) None of these
59. Blood is an incompressible fluid having a density nearly equal to that of choose which one is correct:
(a) Water
(b) Oil
(c) Milk
(d) All of these
60. Human blood pressure is measured in choose which one is correct:
(a) N/m2
(b) Torr
(c) Pascal
(d) cm
61. Blood has a density choose which one is correct:
(a) Greater than water
(b) Equal to water
(c) Less than water
(d) None of these
62. Blood pressure is measured by choose which one is correct:
(a) Barometer
(b) Stetho scope
(c) Sphygmomanometer
(d) Hydrometer
63. Blood is an choose which one is correct:
(a) Incompressible fluid
(b) Compressible fluid
(c) Ideal fluid
(d) Perfect fluid
64. The instrument which detects the instant at which the external pressure becomes equal to the systolic pressure is called choose which one is correct:
(a) Manometer
(b) Sphygmomanometer
(c) Barometer
(d) Hydrometer
65. Tubes of narrow bore and liquids of high viscosity and low density promote choose which one is correct:
(a) Streamline flow
(b) Turbulent flow
(c) Both (a) and (b)
(d) None of these
66. Streamlines passing through a given cross-section normally form choose which one is correct:
(a) Liquid does not cross the boundaries of tubes of flow
(b) Tubes of flow
(c) Steady flow do not overlap each other
(d) All of these
67. Dimensions of are choose which one is correct:
(a) [ML-1 T-1 ]
(b) [ML-3T-2]
(c) [ML-1T-2]
(d) [ML-1T-1]
68. Dimensions of [pgh] are choose which one is correct:
(a) [ML-1 T-2 ]
(b) IML-3T-2]
(c) [ML-1 T-1 ]
(d) [M-2T-2]
69. In the formula for velocity of efflux V = where h is choose which one is correct:
(a) The height of orifice from the bottom of the vessel
(b) Height of liquid column above the orifice
(c) Height of liquid column
(d) None of these
70. Sphygmo is a choose which one is correct:
(a) Greek word
(b) Spanish word
(c) Latin word
(d) None of these
71. Sphygmo means choose which one is correct:
(a) Liver
(b) Pulse
(c) Liver
(d) Heart
72. Bunsen burner works on the principle of choose which one is correct:
(a) Venturi effect
(b) Torricilli’s effect
(c) Bernoulli’s effect
(d) None of these
73. In Laminar flow, adjacent layers choose which one is correct:
(a) Mix with each other
(b) Smoothly slide one over the other
(c) Oppose each other
(d) None of these
74. A man is standing near a fast moving train choose which one is correct:
(a) To fall towards the track
(b) To fall away from the track
(c) No effect
(d) None of these
75. Two boats moving parallel in a river choose which one is correct:
(a) Remain always parallel
(b) Pulled towards each other due to less pressure
(c) Get a part due to increase in pressure
(d) None of these
76. Streamlines are choose which one is correct:
(a) Largely spaced on the upper side than on the inner side of the wing
(b) Equally spaced both on the upper and lower side of the wing
(c) Closer together on the upper side of the wing
(d) None of these
77. A fluid is said to be ideal if it is choose which one is correct:
(a) Non-viscous, incompressible and streamline
(b) Non-viscous and streamline
(c) Non-viscous and incompressible
(d) None of these
78. The blood pressure varies from high systolic pressure to low diastolic pressure of about choose which one is correct:
(a) 80 — 90 torr
(b) 75 — 85 torr
(c) 75 — 80 torr
(d) None of these
79. 1 torr in N/m2 is choose which one is correct:
(a) 129 N/m2
(b) 133.3 N/m2
(c) 135.6 N/m2
(d) 125 N/m2
80. The systolic pressure is about choose which one is correct:
(a) 120 torr
(b) 125 torr
(c) 115 torr
(d) 130 torr
81. Blood pressure of a person choose which one is correct:
(a) Increases with age
(b) Decreases with age
(c) Remain same
(d) None of these
82. The smoot or steady streamline flow is known as choose which one is correct:
(a) Turbulent flow
(b) Laminar flow
(c) Simple flow
(d) None of these
83. The velocity of liquid below which its flow is laminar is called choose which one is correct:
(a) Critical velocity
(b) Escape velocity
(c) Relative velocity
(d) None of these
84. For which position, will the maximum blood pressure in the body have the smallest value choose which one is correct:
(a) Standing one’s leg
(b) Lying horizontally
(c) Standing up right
(d) None of these
85. The smooth r steady streamline flow is called choose which one is correct:
(a) Turbulent flow
(b) Laminar flow
(c) Simple flow
(d) Regular flow
86. Friction in fluids is known as choose which one is correct:
(a) Drag force
(b) Viscosity
(c) Surface tension
(d) None
87. Unit of coefficient of viscosity choose which one is correct:
(a) Nm-2s
(b) kg m-1s-1
(c) Both (a), (b)
(d) None
88. When the magnitude of the drag force becomes equal to the weight, what will be the net force acting on the droplet choose which one is correct:
(a) Minimum
(b) Zero
(c) Maximum
(d) None
89. If velocity of particle at different points does not change with time, flow is choose which one is correct:
(a) Streamline
(b) Laminar
(c) Steady
(d) All
90. Equation of continuity is the basis of law of conservation of choose which one is correct:
(a) Mass
(b) Momentum
(c) Energy
(d) None
91. The product of cross-sectional area of the pipe and the fluid speed at any point along the pipe choose which one is correct:
(a) Constant
(b) Flow rate
(c) Volume flow per second
(d) All
92. As Bernoulli’s equation P + = Constant. Here is choose which one is correct:
(a) K.E.
(b) K.E. per unit volume
(c) K.E. per unit time
(d) None
93. Torricelli’s theorem is choose which one is correct:
(a)
(b)
(c)
(d) None
94. A device used to measure speed of liquid flow choose which one is correct:
(a) Venturi-meter
(b) Speed-meter
(c) Sphyginomeno-meter
(d) None
95. When A liquid flows through a pipe of varying diameter. The velocity of the liquid will 2 m/s at a point when the diameter is 6 cm. What will be the velocity of the liquid at a point where diameter is 3 cm will be choose which one is correct:
(a) 1 m/s
(c) 8 m/s
(d) 16 m/s
96. The dimensional formula of surface tension is choose which one is correct:
(a) [MLT-1 ]
(b) [MLT2]
(c) [ML0T-2]
(d) [ML-1T-1]