Welcome to the **11th Class Physics Chapter 05 MCQs Online**** Test**. We are presenting you with top MCQ questions from the **11th Class Physics Chapter Circular Motion**.

## 11th Class Physics Chapter 05 MCQs with Answers

The 11th Class Physics Chapter “Circular Motion” explores the fascinating dynamics of objects moving in circular paths. This chapter focuses on understanding the principles of circular motion, the forces involved, and the mathematical relationships governing the motion.

The chapter begins by introducing the concept of circular motion and its characteristics. Students will learn about the definitions of angular displacement, angular velocity, and angular acceleration, which are key parameters for describing circular motion.

Students will delve into the principles of centripetal force, the force that keeps an object moving in a circular path. They will understand the relationship between centripetal force, mass, velocity, and radius of the circular path. Students will also explore the concepts of centrifugal force and the misconception associated with it.

The chapter further explores the mathematical relationships governing circular motion. Students will learn about the equations that describe the relationships between linear velocity, angular velocity, radius, and period of revolution. They will also understand the concept of centripetal acceleration and its relationship with linear acceleration.

Moreover, students will explore the concept of banked curves and the role of friction in circular motion. They will learn about the conditions for safe banking of roads and tracks to prevent vehicles from skidding during turns.

The chapter may also cover topics such as vertical circular motion and simple harmonic motion. Students will understand the principles of motion in vertical circles, including the forces involved and the conditions for complete circular motion. They will also explore the concept of simple harmonic motion and its relationship with circular motion.

To enhance understanding, the chapter may include practical examples, diagrams, and problem-solving exercises. Students will develop skills in analyzing and calculating quantities related to circular motion, applying the principles of centripetal force, and solving problems related to circular motion scenarios.

Studying “Circular Motion” in the 11th Class Physics curriculum provides students with a solid foundation in understanding the principles and applications of circular motion. It prepares them for further studies in mechanics, dynamics, and related fields. Additionally, it cultivates critical thinking skills, mathematical reasoning, and an appreciation for the complexities of motion in circular paths.

**What is ****Circular Motion****?**

**a movement of an object while rotating along a circular path**. Circular motion can be either uniform or non-uniform. During uniform circular motion the angular rate of rotation and speed will be constant while during non-uniform motion the rate of rotation keeps changing.

**Chapter 5 ****Circular Motion**

**1 When a body is moving along a circular path, it covers a certain angle in given time. Such a type of motion is called choose which one is correct:**

(a) Linear motion

**(b) Angular motion**

(c) Vibratory motion

(d) Rotatory motion

**2. When a body moves in such a way that its distance from the mean position remains constant is called choose which one is correct:**

(a) Linear motion

**(b) Circular motion**

(c) Vibratory motion

(d) Rotatory motion

**3. The angle through which a body moves is called choose which one is correct:**

**(a) Angular displacement**

(b) Angular velocity

(c) Angular acceleration

(d) None of these

**4. The SI unit of angular displacement is choose which one is correct:**

(a) Metre

(b) Kilometre

**(c) Radian**

(d) None of these

**5. The angle subtended at the center of a circle by an arc equal to its radius is called choose which one is correct:**

**(a) One radian**

(b) One degree

(c) One rotation

(d) None of these

**6 One radian is equal to choose which one is correct:**

(a) 47.3^{0}

**(b) 57.3 ^{0}**

(c) 67.3^{0}

(d) 59.3^{0}

**7 The linear acceleration of bodies moving in circular path is choose which one is correct:**

(a) Constant

(b) Negative

(c) Positive

**(d) Zero**

**8. The angular displacement is assign positive sign when the rotation is choose which one is correct:**

(a) Clockwise

**(b) Anti-clock wise**

(c) Perpendicular

(d) Parallel

**9. The direction associated with angular displacement is given by choose which one is correct:**

(a) Left hand rule

(b) Head to tail rule

**(c) Right hand rule**

(d) None of these

**10. Angular displacement is a choose which one is correct:**

(a) Scalar

**(b) Vector**

(c) Neither scalar nor vector

(d) None of these

**11. Radian is defined as the angle subtended at the center of a circle by an choose which one is correct:**

**(a) Arc whose length equal to radius of circle**

(b) Arc whose length less than radius of circle

(c) Arc whose length greater than radius of circle

(d) None of these

**12. Which one is the correct relation for angular displacement O, radius r and length of arc S is choose which one is correct:**

**(a) S = r 0**

(b) = ~~0~~

(c) Sr = ~~0~~

(d) S~~0~~ = r

**13. The rate of change of angular displacement is known as choose which one is correct:**

(a) Angular speed

(b) Angular acceleration

**(c) Angular velocity**

(d) None of these

**14. Angular velocity is a choose which one is correct:**

(a) Scalar

**(b) Vector**

(c) Neither scalar nor vector

(d) None of these

**15. The direction of angular velocity of a body moving in a circle is choose which one is correct:**

(a) Towards the axis of rotation

(b) Away from the axis of rotation

**(c) Along the axis of rotation**

(d) None of these

**16. Average angular velocity is defined by the relation choose which one is correct:**

(a) <> =

**(b) <> =**

(c) <> =

(d) <> =

**17. When an object moves in a circle, the angle between angular velocity and linear velocity v is choose which one is correct:**

**(a) 90 ^{0}**

(b) 0^{0}

(c) 45^{0}

(d) 60^{0}

**18. The angular velocity at any instant is called choose which one is correct:**

**(a) Instantaneous angular velocity**

(b) Instantaneous angular speed

(c) Instantaneous angular displacement

(d) None of these

**19. If a particle moves in a circle of radius r with uniform angular velocity o then the angle between radius r and linear velocity V is choose which one is correct:**

(a) 45^{0}

**(b) 9 ^{0}**

(c) 60^{0}

(d) 180^{0}

**20. The rate of change of angular velocity is known as choose which one is correct:**

(a) Angular velocity

**(b) Angular acceleration**

(c) Angular displacement

(d) None of these

**21. SI unit of angular acceleration is choose which one is correct:**

**(a) rad/s ^{2}**

(b) rad/s

(c) rad.s^{2}

(d) rad.s

**22. The relation between linear acceleration and angular acceleration is choose which one is correct:**

(a) = a x r

(b) a = r x

(c) r = a x

**(d) a = x r**

**23. The dimensions of angular acceleration are choose which one is correct:**

(a) [LT^{-2}]

**(b) [T ^{2}]**

(c) [LT^{-1}]

(d) [T^{-3}]

**24. The relation between linear velocity and angular velocity is choose which one is correct:**

**(a) V = r x**

(b) V = x r

(c) = V x r

(d) r = V x

**25. The dimensions of angular velocity are choose which one is correct:**

(a) [LE^{-1}]

(b) [LT]

(c) [LE^{-2}]

**(d) [T ^{-1.}]**

**26. If a rotating body is moving anti-clockwise, the direction of angular velocity is choose which one is correct:**

(a) Towards the centre

(b) Along the linear velocity

(c) Away from the centre

**(d) Perpendicular to both radius and linear velocity**

**27. Angular acceleration is produced due to choose which one is correct:**

(a) Centripetal force

**(b) Torque**

(c) Force

(d) None of these

**28. When the lift is moving upwards with an acceleration a then weight of the object appears to be than real weight.**

(a) Less

**(b) More**

(c) No change

(d) None

**29. The force needed to bend the normally straight path of particle into a circular path is known as choose which one is correct:**

(a) Inertia

(b) Torque

**(c) Centripetal force**

(d) None of these

**30. When a body is moving in a circle of radius r with constant linear velocity v, its centripetal force is choose which one is correct:**

(a)

(b)

(c)

(d) none of these

**31. When a body moves in a circle of radius r with angular speed o, its centripetal force is choose which one is correct:**

(a)

**(b)**

(c)

(d)

**32. A body is moving in a circle of radius r with constant speed V, its centripetal acceleration is choose which one is correct:**

**(a)**

(b) v^{2}r

(c)

(d)

**33. A body is moving in a circle of radius r with constant angular velocity 0), its centripetal acceleration is choose which one is correct:**

(a)

(b)

**(c)**

(d)

**34. The force required to keep a body into a circle is called choose which one is correct:**

(a) Centrifugal force

**(b) Centripetal force**

(c) Gravitational force

(d) None of these

**35. A body is moving in a circle at constant speed. Which of the following statement is correct choose which one is correct:**

(a) There is no force acting away from the centre of the circle

**(b) There is no force acting towards the centre of the circle**

(c) There is no acceleration

(d) None of these

**36. The vectorial form Of centripetal force is choose which one is correct:**

(a)

**(b)**

(c)

(d)

**37. An object is traveling in a circle with constant speed. Its acceleration is constant in choose which one is correct:**

(a) Direction only

**(b) Magnitude only**

(c) Both magnitude and direction

(d) None of these

**38. A body of mass 4 kg moves along a circle of radius 2m with a constant speed of**

**4 m/s. The centripetal force is choose which one is correct:**

**(a) 32 N**

(b) 16N

(c) 20 N

(d) 64 N

**39. In case of planets, the necessary acceleration is provided by choose which one is correct:**

(a) Coulombs force

(b) Centripetal force

**(c) Gravitation force**

(d) None of these

**40. The necessary centripetal force to the moving car round a corner track is provided by choose which one is correct:**

(a) Centrifugal force

(b) Gravitational force

(c) Coulombs force

**(d) Frictional force**

**41. The mud flies off the tyre of a moving bicycle in the direction of choose which one is correct:**

(a) Towards the centre

**(b) Tangent to the tyre**

(c) Along the radius

(d) Along the motion

**42. The angular momentum is defined as choose which one is correct:**

(a) L = mv

(b) L = r x F

**(c) L = r x P**

(d) L = P x r

**43. The SI unit of angular momentum is choose which one is correct:**

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

(b) kg m^{2}/s^{2}

(c) kg^{2} m/s

(d) kg m/s

**44. The dimensions of angular momentum L are choose which one is correct:**

(a) [M^{2} LT^{-1}]

(b) [M^{2}L^{2}T]

(c) [ML^{2}T^{2}]

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

**45. Angular momentum of a body under central force is choose which one is correct:**

(a) Minimum

(b) Zero

(c) Maximum

**(d) Constant**

**46. A body rotating in a circle of radius I m with an angular speed 10 rad/s has the tangential velocity choose which one is correct:**

(a) 2 m/s

(b) 5 m/s

**(c) 10 m/s**

(d) 15 m/s

**47. The rate of change of angular momentum of a body is choose which one is correct:**

**(a) The applied torque**

(b) The applied force

(c) Both (a) and (b)

(d) None of these

**48. Angular momentum is conserved under choose which one is correct:**

(a) Variable force

(b) Constant force

**(c) Central force**

(d) None of these

**49. The direction of angular momentum L is choose which one is correct:**

(a) Along the direction of P

(b) Along the direction r

(c) Parallel to the plane containing r and P

**(d) Perpendicular to the plane containing r and P**

**50. The angular momentum of a body about a fixed point is conserved if its velocity choose which one is correct:**

(a) Increases

**(b) Decreases**

(c) Constant

(d) None of these

**51. Angular momentum of a rigid body is equal to choose which one is correct:**

**(a) 1**

(b)

(c)

(d)

**52. In rotational motion, the quantity which plays the same role as the inertial mass in term of linear motion is known as choose which one is correct:**

(a) Angular momentum

(b) Linear momentum

**(c) Momentum of inertia**

(d) Torque

**53. The value of angular momentum is maximum when O is choose which one is correct:**

(a) 60^{0}

(b) 45^{0}

(c) 0^{0}

**(d) 90 ^{0}**

**54. The angular momentum L in terms of angular velocity is equal to choose which one is correct:**

**(a) mr ^{2})**

(b) rn^{2}

(c) m

(d) m^{2}r^{22}

**55. The product of the mass m of the rotating body and the square of radius of gyration is called choose which one is correct:**

**(a) Moment of inertia**

(b) Torque

(c) Linear momentum

(d) None Of these

**56. Mathematically moment of inertia is equal to choose which one is correct:**

**(a) I = mr ^{2}**

(b) I = mr

(c) rn^{2}r

(d) I = m^{2}r^{2}

**57. The moment of inertia depends upon choose which one is correct:**

(a) Angular momentum

(b) Mass of the body and its angular speed

(c) Mass of the body and its radius

**(d) Mass as well as its distribution with respect to axis of rotation**

**58. Moment of inertia of a thin rod about mid length is choose which one is correct:**

**(a) I = mL ^{2}**

(b) I = mr^{2}

(c) I = mr^{2}

(d) I = mr^{2}

**59. Moment of inertia of a hoop about its axis is choose which one is correct:**

(a) I = mr^{2}

**(b) I = mr ^{2}**

(c) I = mr^{2}

(d) I = mr^{2}

**60. The moment of inertia of a body comes in action in choose which one is correct:**

**(a) Circular motion**

(b) Straight line motion

(c) Curved path

(d) None of these

**61. The SI unit of angular momentum is choose which one is correct:**

(a) kgm^{3}

(b) kgm

**(c) kgm ^{2}**

(d) kgm^{-2}

**62. The physical quantity which plays the same part in angular motion as mass does in linear motion is called choose which one is correct:**

**(a) Moment of inertia**

(b) Momentum

(c) Torque

(d) None of these

**63. The physical quantity which produces angular acceleration is known as choose which one is correct:**

(a) Force

**(b) Torque**

(c) Inertia

(d) None of these

**64. Moment of inertia of a solid disc about its axis is choose which one is correct:**

**(a) mr ^{2}**

(b) mr^{-3}

(c) mr^{2}

(d) mr^{2}

**65. Moment of inertia of a sphere is choose which one is correct:**

(a) mr^{2}

(b) mr^{-3}

**(c) mr ^{2}**

(d) mr^{2}

**66. The dimensions of moment of inertia are choose which one is correct:**

**(a) [ML ^{2} ]**

(b) [ML^{-2}]

(c) [ML^{-1}]

(d) [M^{2}L]

**67. The force and torque are analogues to choose which one is correct:**

**(a) Each other**

(b) Moment of inertia

(c) Velocity

(d) None of these

**68. The total weight of the body acts at choose which one is correct:**

**(a) its center of gravity**

(b) its centre

(c) its one end

(d) its other end

**69. The center of gravity is also called choose which one is correct:**

(a) Centre of body

**(b) Centre of mass**

(c) Both (a) and (b)

(d) None of these

**70. The acceleration due to gravity choose which one is correct:**

(a) Same value at every place

(b) Same value everywhere on the surface of earth

**(c) Varies with altitude**

(d) none of these

**71. The value of ‘g’ at the center of the Earth will be choose which one is correct:**

(a) Infinite

(b) Double

**(c) Zero**

(d) None of these

**72. Law of conservation of angular momentum states that if no acts on a system, the total angular momentum of the system remains constant choose which one is correct:**

(a) External torque

(b) External couple

**(c) External force**

(d) None of these

**73. The axis Of rotation of a body will not change its orientation unless an external causes it to do so choose which one is correct:**

(a) Force

**(b) Torque**

(c) Work

(d) Energy

**74. A cricketer spins the ball before bowling to choose which one is correct:**

(a) Give it downward deflection

**(b) Give it upward deflection**

(c) Keep it straight

(d) None of these

**75. An elevator is accelerated downward with acceleration a, the apparent weight of a body of mass m in it will be choose which one is correct:**

(a) m(a – g)

(b) m(g + a)

**(c) m(g – a)**

(d) mg

**76. An elevator is accelerated upward with acceleration a, the apparent weight of a body of mass m in it will be choose which one is correct:**

(a) m(a – g)

**(b) m(g + a)**

(c) m(g – a)

(d) mg

**77. If the rope of an elevator moving downward with acceleration a breaks, the apparent weight of a body of mass m in it will be choose which one is correct:**

(a) m(a – g)

(b) m(g + a)

(c) m(g – a)

**(d) zero**

**78. The K.E of a disc of mass m rolling down on an included plane is choose which one is correct:**

(a) mv^{2}

**(b) mv ^{2}**

(c) mv^{2}

(d) None of these

**79. The rotation K.E of any hoop of radius r is given by choose which one is correct:**

**(a)**

(b)

(c)

(d) none

**80. Suppose a body of cylindrical shape is called down on an inclined plane of height h. It contains choose which one is correct:**

(a) Translation K.E

(b) Rotational K.E

**(c) Both (a) and (b)**

(d) None of these

**81. Speed of hoop at the bottom can be given by choose which one is correct:**

**(a) v =**

(b) v =

(c) v =

(d) None of these

**82. Orbital velocity of a satellite orbiting closer to the planet is given by choose which one is correct:**

(a) v =

(b) v =

**(c) v =**

(d) None of these

**83. If the earth stops rotating weight of a body on the equator choose which one is correct:**

(a) Increases

(b) Remains constant

**(c) Decreases**

(d) None of these

**84. A body becomes weightless choose which one is correct:**

(a) Spaceship orbiting the earth

(b) Outside the field free region

(c) On the earth ‘s centre

**(d) All Of above**

**85. The axis of rotation of a rotating body in the absence of external torque choose which one is correct:**

(a) Continuously changes

**(b) Remain fixed in direction**

(c) Both (a) and (b)

(d) None of these

**86. The number of satellite included in the Global positioning system is choose which one is correct:**

(a) 20

(b) 48

**(c) 24**

(d) None of these

**87. Orbital speed of a satellite at large enough height h above the earth’s surface is choose which one is correct:**

(a)

**(b)**

(c)

(d) None of these

**88. In a spaceship orbiting the earth, the apparent weight of the body in it is choose which one is correct:**

(a) Less than its real weight

(b) Greater than its real weight

**(c) Weightlessness**

(d) None of these

**89. One communication satellite covers choose which one is correct:**

(a) 240 longitudinal lines

(b) 360 longitudinal lines

**(c) 120 longitudinal lines**

(d) none of these

**90. International telecommunication in satellite organization (INTELSAT) choose which one is correct:**

(a) Operates at microwave frequency 4.611 and 149 Hz

(b) Has capability of 30,000 two-way telephone circuits

(c) Provides facility of three T.V channels

**(d) All of above**

**91. Height of the closest orbit of the satellite above the earth is choose which one is correct:**

(a) 300 km

(b) 250 km

(c) 500 km

**(d) 400 km**

**92. Radius of the geo-stationary orbit from the earths center is choose which one is correct:**

**(a) 4.24 x 10 ^{4} km**

(b) 3.23 x 10^{4} km

(c) 4.23 x 10^{3} km

(d) None of these

**93. Height of geo-stationary satellite above the equator is choose which one is correct:**

(a) 40,000 km

(b) 24,000 km

(c) 30,000 km

**(d) 36,000 km**

**94. Entire populated earth, surface is covered by choose which one is correct:**

(a) Four

**(b) Three**

(c) Two

(d) None of these

**95. The geo-stationary satellite are used for choose which one is correct:**

(a) World communications

(b) Weather observations

(c) Navigation

**(d) All of above**

**96. Einstein theory was considered as a choose which one is correct:**

**(a) Scientific trump**

(b) Simple trump

(c) Natural trump

(d) None of these

**97. Which theory of gravitation is better choose which one is correct:**

(a) Newton

**(b) Einstein**

(c) Compton

(d) Plank

**98. The product of linear momentum and moment arm for momentum is called choose which one is correct:**

(a) Momentum

**(b) Angular momentum**

(c) Torque

(d) Moment of inertia

**99. radian.**

**(a) 0.01745**

(b) 57

(c) 0.1745

(d) 0.2

**100. If r= I m and O = 1**^{0}** then what is value of S choose which one is correct:**

**(a) 0.01745 m**

(b) 1 m

(c) 2 m

(d) none