# 11th Class Physics Chapter 06 MCQs with Answers

Welcome to the 11th Class Physics Chapter 06 MCQs Online Test. We are presenting you with top MCQ questions from the 11th Class Physics Chapter Fluid Dynamics.

We want to tell you that you can find all the 10th Class Physics Chapter 06 MCQs online tests on our website. These online tests are great for learning and as well as for scoring maximum marks in your Intermediate Exams. We are making these Class 11 Physics MCQs online tests for those who want full marks in their exams. Attempt all these Grade 11 Physics Online Multiple Choice Questions MCQs before going for the exam and it will be beneficial for you! These online tests contain all the important multiple choice questions in the important topics of the HSC Part 1  Physics Chapter 06 Fluid Dynamics

## 11th Class Physics Chapter 06 MCQs with Answers

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This is a free platform for students to prepare for Physics Exams for Class 11 to get the best accomplishments in annual exams. 11th class Students can analyze themself by attempting this online test system as many times as they want until they find themself fully prepared.

### MCQs Class 11 Physics with Answers

The purpose of these online MCQs tests is to help you evaluate your 11th Class Physics Chapter 11 MCQs. These Multiple Choice Questions (MCQs) will prepare you for your academic success in the 11th Class Exams. 11th Class Physics Chapters include Chapter 1 Measurement, Chapter 2 Vectors and Equilibrium, Chapter 3 Motion and Force, Chapter 4 Work and Energy, Chapter 5 Circular Motion, Chapter 6 Fluid Dynamics, Chapter 7 Oscillations, Chapter 8 Waves, Chapter 9 Physical Optics, Chapter 10 Optical Instrument, and Chapter 11 Heat And Thermodynamics

### What is Fluid Dynamics?

Fluid dynamics is “the branch of applied science that is concerned with the movement of liquids and gases,” according to the American Heritage Dictionary. Fluid dynamics is one of two branches of fluid mechanics, which is the study of fluids and how forces affect them.

Chapter 6 Fluid Dynamics

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

(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:

(d) None of these

30. The terminal velocity of the spherical object is given by choose which one is correct:

(a) v=

(b) v=

(c) v=

(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:

(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) A1V= 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 – P= 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) h– 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

(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]