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ECAT Physics Circular Motion Online Test

Maan AliLast Updated: April 18, 2025

Physics Circular Motion MCQS Online Test

ECAT Physics Circular Motion Chapter Online Test

Total Questions:	75
Time Allowed:	40 Minutes
Total Marks:	75
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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ECAT Physics Circular Motion MCQS Online Test

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Page 1 of 3

Physics

1. One radian is equal to

67.3°

57.3°

87.3°

60°

2. The circumference subtends an angle

π radian

2π radian

π/2 radian

4π radian

3. When a body is moving along a circular path it covers a certain angle in a given internal of time. Such type of motion is

Vibratory motion

Linear motion

Rotatory motion

Angular motion

4. The direction of linear velocity of body moving in a circle is:

Along the axis of rotation

Along the tangent

Directed towards the center

Directed away from the center

5. When a body movies in a circle of radius r with linear speed V its centripetal force is

mV/r²

mV/r

mV²/r

mV²/r²

6. If a car moves with a uniform speed of 2 ms¯¹ in a circle of radius 0.4. Its angular speed is

4 rad. S¯¹

5 rad. S¯¹

1.6 rad. S¯¹

2.8 ms¯¹

7. If a wheel of radius r turns through an angle of 30? Then the distance through which any point on its rim moves is:

π/3 x r

π/6 x r

π/30 x r

π/180 x r

8. What is outward force acting on a mass of 10 kg when rotating at one end an inelastic string 10m long at speed of 1m/s?

10N

100N

9. A body is traveling in a circle at constant speed. It

Has constant velocity.

Has no acceleration

Has an inward acceleration

Has an outward radial acceleration

10. A man of weight W is standing on an elevator which is ascending with an acceleration a. The apparent weight of the man is:

mg – ma

mg + ma

mg – ma

11. A body of 2 kg is suspended from the ceiling of an elevator moving up with an acceleration g. Its apparent weight in the elevator will be

9.8 N

19.6 N

129.4 N

39.2 N

12. If a body of mass 10 kg is allowed to fall freely, its weight becomes

Zero

89 N

9.8 N

10 N

13. A race-car is traveling in uniform circular motion around a racetrack. What happens to the centripetal acceleration of the car if the speed is doubled but the radius of the circle remains constant?

It remains the same

It increases by a factor of 2

It increases by a factor of 4

It is decreased by a factor of one-half.

14. Which force is responsible for holding a car in an unbanked curve?

The car’s weight

The force of friction

The reaction force to the car’s weight

The vertical component of the normal force

15. The relation between linear and angular acceleration is

a = a x s

a = r x a

a = a x r

r = a x a

16. Centripetal force performs

Maximum work

Minimum work

Negative work

No work

17. A cyclist cycling around a circular racing track skids because

The centripetal force upon him is less than limiting frication

The centripetal force upon him is greater than limiting friction

The centripetal force upon him is equal to the limiting frication

The friction between the tyres of the cycle and road vanishes

18. Geo-stationary satellite completes one rotation around earth in

3 hours

6 hours

12 hours

24 hours

19. In case of planets the necessary acceleration is provided by

Gravitational force

Frictional force

Coulomb force

Centripetal force

20. A satellite moving round the earth constitutes

An inertial frame of reference

Non inertial frame

Neither inertial nor non inertial

Both inertial and non-inertial

21. Minimum number of communication satellites required to cover the whole earth is

22. The critical speed of an artificial satellite is

8 kms¯¹

8.1 Kms¯¹

7.9 Kms¯¹

8 ms¯¹

23. Angle subtended at the center of the circle by a body is called

Angular velocity

Linear velocity

Angular displacement

All of these

24. When a body moves in a circle in the clockwise direction, the angular displacement ∆θ is taken as

Positive

Negative

Both way

None of these

25. The torque on a body will be zero if the angle between r and is zero or:

90°

180°

270°

None of these

Page 2 of 3

26. The direction of angular displacement is determined by using

Heat-to-tail rule

Fleming left hand rule

Right angle rule

None of these

27. If the distance between two mass particles is doubled, the gravitational force between them

Is reduced to half of the original value

Is reduced to one fourth of the original value

Becomes double

Becomes four times

28. Angular displacement generally expressed in

Degrees

Revolution

Radian

All of these

29. Radian is the unit of angular displacement which is

Less than degree

Greater than degree

Equal

None of these

30. A couple produces

Purely linear motion

Purely rotational motion

Linear and rotational motion

No motion

31. One radian is equal to

360°/π

58°

57°

57.3°

32. The angular speed of a flywheel making 120 revolutions/minute is:

π rad/s

2π rad/s

4π rad/s

6π rad/s

33. The rate at which the angular displacement is changing with time is called

Angular acceleration

Angular velocity

Average angular velocity

None of these

34. In a uniform circular motion (horizontal) of a ball tied with a string, velocity at any time is at any angle θ with acceleration, then θ is

θ = 60°

θ = 30°

θ = 90°

None of these

35. S. I. unit of angular velocity is

Radian per second

Revolution per minute

Degree per second

None of these

36. If a particle covers half the circle of radius R with constant speed then

Momentum change is mvr

Change in KE is 1/2 mv²

Change is KE is mv²

Change in KE is zero

37. AS the ∆t approaches to zero, the limit of ration ∆ω/∆t becomes

Average acceleration

Variable angular acceleration

Instantaneous angular acceleration instantaneous

None of these

38. Angular acceleration is a

Scalar quantity

Variable quantity

Vector quantity

None of these

39. The units of angular acceleration is

Radian

Radian per second

Radian per second²

None of these

40. The axis of ration of an object will not change its orientation unless

Internal torque acts

Internal torque acts in one direction

External torque acts

None of these

41. The linear velocity in a circle is called

Linear velocity

Angular velocity

Tangential velocity

None of these

42. At the top of the trajectory of a projectile, the acceleration is

Maximum

Minimum

Zero

43. The relation between linear acceleration and angular acceleration is

a = rωa

a = r/ω a

a =ωr/a

a₁ = ra

44. By the use of angular variable we can describe the

Linear motion of a body

Angular motion of a body

Both

None of these

45. For keeping a body in circular motion, the force required is

Centripetal

Centrifugal

Radial

Tangential

46. In a uniform circular motion of a particle, the direction changes but not its

Angular displacement

Magnitude of velocity

Force towards center

B and C

47. The quantity mr² is known as

Moment arm

Moment of inertia

Moment of force

None of these

48. Moment of inertia depends on mass and also on

r²

r³

None of these

49. If a force acts on a body, whose action line does not pass through its center of gravity, then the body well experience

Angular acceleration

Linear acceleration

No acceleration

None of these

50. Moment of inertia of a thin ring or hoop is

mr²

2/3mr²

5/6mr²

1/3mr²

Page 3 of 3

51. If the particle is moving in a circle of radius‘s’ with uniform angular velocity ω. The angle between r and tangential velocity is

0°

90°

180°

270°

52. The spine angular momentum is the angular momentum of a

Rotating body

Revolving body

Spiming body

None of these

53. The orbital radius as the revolving body is revolving is

Very Smaller

Larger

Smaller

None of these

54. Law of conservation of momentum has been verified for the

Cosmological level

Microscope level

Submicroscopic level

A and C

55. The angular momentum of a particle having uniform velocity about a fixed origin:

Varies with its position w.r.t. the origin

Varies with time

Remains constant

Is zero

56. The angular momentum is a vector quantity with due

Perpendicular to the axis of rotation

Along the axis of rotation

At the axis of rotation

None of these

57. A body moving in circular motion with constant speed has

Constant velocity

Constant acceleration

Constant kinetic energy

Constant displacement

58. Angular momentum is

Vector (axial)

Vector (polar)

Scalar

None of these

59. What remains constant in the field of central force?

Potential energy

Kinetic energy

Angular momentum

Linear momentum

60. What remains constant when the earth revolves around the sun?

Angular momentum

Linear momentum

Angular kinetic energy

Linear kinetic energy

61. A couple produces

Purely linear motion

Purely rotational motion

Linear and rotational motion

No motion

62. In which case application of angular velocity is useful?

When a body is rotating

When velocity of body is in a straight line

When velocity is in a straight line

None of these

63. Which of the following is the relation of centripetal force?

mv²/r

mv/r

mv³/r

mv³/r²

64. The angular speed of a flywheel making 120 revolutions/minute is:

π rad/s

2π rad/s

4π rad/s

6π rad/s

65. A cyclist bends while taking a turn to:

Reduce friction

Generate required centripetal force

Reduce apparent weight

Reduce speed

66. A body of mass 5 kg is moving in a circle of radius 1 m with an angular velocity of 2 rad/s. The centripetal force, is

10 N

20 N

30 N

40 N

67. A body is moving with a uniform speed along a straight line. Its angular momentum with respect to a fixed point away from the line

Increases as the body moves away from the point

Decreases as the body moves away from the point

Is zero

Is constant and does not depend on the position of the body

68. Which of the following statements about angular momentum is correct?

Angular momentum remains conserved

Angular momentum is the product of moment of inertia and angular velocity

Moment of inertia is directly proportional to angular momentum for constant angular speed

All of these

69. A particle is acted upon by a force of constant magnitude which is always perpendicular to the velocity of particle. The motion of the particle takes place in a horizontal plane. It follows

Linear momentum is constant

Velocity is constant

It moves in a circular path

None of these

70. A car is moving high velocity when it takes a turn. A force acts on it outwardly because of

Centripetal force

Centrifugal force

Gravitational force

All of these

71. In a uniform circular motion

Velocity and acceleration remain constant

Kinetic energy remain constant

Speed and acceleration change

Only velocity change, acceleration remain constant

72. The motion of planets in the solar system is an example of the conservation of:

Mass

Linear momentum

Angular momentum

Energy

73. In case of uniform circular motion which of the following physical quantity do not remain constant?

Speed

Momentum

Kinetic energy

Mass Angular momentum

74. Angular momentum of a body is defined as the product of

Mass and angular velocity

Centripetal force and radius

Linear velocity and angular velocity

Moment of inertia and angular velocity Mass and acceleration due to gravity

75. The direction of the angular velocity vector is along.

The tangent to the circular path

The inward radius

The outward radius

The axis of rotation

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Maan AliLast Updated: April 18, 2025

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ECAT Physics Circular Motion Online Test

Physics Circular Motion MCQS Online Test

ECAT Physics Circular Motion Chapter Online Test

ECAT Physics Circular Motion MCQS Online Test

Physics

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Maan Ali

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Physics Circular Motion MCQS Online Test

ECAT Physics Circular Motion Chapter Online Test

ECAT Physics Circular Motion MCQS Online Test

Physics

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