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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) F _{d} = 6 **

(b) F_{d} =

(c) F_{d} =

(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 F*_{d}* = 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) [ML^{2}T^{-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) Nm^{2}s^{2}

(c) kg m^{2}s^{2}

(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 10^{3} Nsm^{-2}

**(b) 0.019 x 10 ^{-3}N-sm^{-2}**

(c) 0.0019 x 10^{-3} N-sm^{-2}

(d) 0.0019 x 10^{3} 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 10^{3} 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 10^{3} 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) v _{t }= **

(b) v_{t }=

(c) v_{t }=

(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) A _{1}V_{1 }= A_{2}V_{2}**

(b) =

(c) =

(d) A_{1}V_{1}t_{1}= A_{2}V_{2}t_{2}

*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) P_{1}V_{2}V_{1} = P_{2}V_{1}V_{2}

**(b) P _{1}A_{1}V_{1} = P_{2}V_{2}A_{2}**

(c) P_{2}A_{2}V_{1} = P_{ 1}A_{1}V_{2}

(d) None of these

*39. The SI units of flow rate is choose which one is correct: *

(a) m^{2}/s^{2}

**(b) m ^{3}/s**

(c) m^{3}/s^{2}

(d) m^{2}/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 + pv^{2} = 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) V_{2} =

(b) V_{2} =

**(c) V _{2} =**

(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) P_{1} + P_{2}=pv_{2}^{2}

(b) P_{1} – P_{2}= pV_{2}^{2}

**(c) P _{1} – P_{2 }= PV_{2}^{2} **

(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) h_{1} + h_{2}

(b) h_{2} – h,

**(c) h _{1 }– h_{2}**

(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/m^{2}

**(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^{-3}T_{-2}]

**(c) [ML ^{-1}T^{-2}] **

(d) [ML^{-1}T^{-1}]

*68. Dimensions of [pgh] are choose which one is correct:*

**(a) [ML ^{-1} T^{-2} ] **

(b) IML^{-3}T^{-2}]

(c) [ML^{-1} T^{-1} ]

(d) [M^{-2}T^{-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/m*^{2}* is choose which one is correct: *

(a) 129 N/m^{2}

**(b) 133.3 N/m ^{2}**

(c) 135.6 N/m^{2}

(d) 125 N/m^{2}

*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^{-2}s

(b) kg m^{-1}s^{-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) [MLT^{2}]

**(c) [ML ^{0}T^{-2}] **

(d) [ML^{-1}T^{-1}]