Physics Rotational and Circular Motion Online Mcqs Test

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Question 1

1. One radian is equal to

Question 2

2. The circumference subtends an angle

Answer

2π radian

Answer

π/2 radian

Answer

4π radian

Question 3

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

Answer

Vibratory motion

Answer

Linear motion

Answer

Rotatory motion

Answer

Angular motion

Question 4

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

Answer

Along the axis of rotation

Answer

Along the tangent

Answer

Directed towards the center

Answer

Directed away from the center

Question 5

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

Question 6

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

Answer

4 rad. S¯¹

Answer

5 rad. S¯¹

Answer

1.6 rad. S¯¹

Answer

2.8 ms¯¹

Question 7

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:

Answer

π/180 x r

Question 8

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?

Question 9

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

Answer

Has constant velocity.

Answer

Has no acceleration

Answer

Has an inward acceleration

Answer

Has an outward radial acceleration

Question 10

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:

Question 11

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

Question 12

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

Question 13

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?

Answer

It remains the same

Answer

It increases by a factor of 2

Answer

It increases by a factor of 4

Answer

It is decreased by a factor of one-half.

Question 14

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

Answer

The car’s weight

Answer

The force of friction

Answer

The reaction force to the car’s weight

Answer

The vertical component of the normal force

Question 15

15. The relation between linear and angular acceleration is

Question 16

16. Centripetal force performs

Answer

Maximum work

Answer

Minimum work

Answer

Negative work

Question 17

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

Answer

The centripetal force upon him is less than limiting frication

Answer

The centripetal force upon him is greater than limiting friction

Answer

The centripetal force upon him is equal to the limiting frication

Answer

The friction between the tyres of the cycle and road vanishes

Question 18

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

Question 19

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

Answer

Gravitational force

Answer

Frictional force

Answer

Coulomb force

Answer

Centripetal force

Question 20

20. A satellite moving round the earth constitutes

Answer

An inertial frame of reference

Answer

Non inertial frame

Answer

Neither inertial nor non inertial

Answer

Both inertial and non-inertial

Question 21

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

Question 22

22. The critical speed of an artificial satellite is

Answer

8.1 Kms¯¹

Answer

7.9 Kms¯¹

Question 23

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

Answer

Angular velocity

Answer

Linear velocity

Answer

Angular displacement

Answer

All of these

Question 24

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

Answer

None of these

Question 25

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

Answer

None of these

Question 26

26. The direction of angular displacement is determined by using

Answer

Heat-to-tail rule

Answer

Fleming left hand rule

Answer

Right angle rule

Answer

None of these

Question 27

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

Answer

Is reduced to half of the original value

Answer

Is reduced to one fourth of the original value

Answer

Becomes double

Answer

Becomes four times

Question 28

28. Angular displacement generally expressed in

Answer

Revolution

Answer

All of these

Question 29

29. Radian is the unit of angular displacement which is

Answer

Less than degree

Answer

Greater than degree

Answer

None of these

Question 30

30. A couple produces

Answer

Purely linear motion

Answer

Purely rotational motion

Answer

Linear and rotational motion

Question 31

31. One radian is equal to

Question 32

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

Question 33

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

Answer

Angular acceleration

Answer

Angular velocity

Answer

Average angular velocity

Answer

None of these

Question 34

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

Answer

None of these

Question 35

35. S. I. unit of angular velocity is

Answer

Radian per second

Answer

Revolution per minute

Answer

Degree per second

Answer

None of these

Question 36

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

Answer

Momentum change is mvr

Answer

Change in KE is 1/2 mv²

Answer

Change is KE is mv²

Answer

Change in KE is zero

Question 37

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

Answer

Average acceleration

Answer

Variable angular acceleration

Answer

Instantaneous angular acceleration instantaneous

Answer

None of these

Question 38

38. Angular acceleration is a

Answer

Scalar quantity

Answer

Variable quantity

Answer

Vector quantity

Answer

None of these

Question 39

39. The units of angular acceleration is

Answer

Radian per second

Answer

Radian per second²

Answer

None of these

Question 40

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

Answer

Internal torque acts

Answer

Internal torque acts in one direction

Answer

External torque acts

Answer

None of these

Question 41

41. The linear velocity in a circle is called

Answer

Linear velocity

Answer

Angular velocity

Answer

Tangential velocity

Answer

None of these

Question 42

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

Question 43

43. The relation between linear acceleration and angular acceleration is

Answer

a = r/ω a

Question 44

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

Answer

Linear motion of a body

Answer

Angular motion of a body

Answer

None of these

Question 45

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

Answer

Centripetal

Answer

Centrifugal

Answer

Tangential

Question 46

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

Answer

Angular displacement

Answer

Magnitude of velocity

Answer

Force towards center

Question 47

47. The quantity mr² is known as

Answer

Moment arm

Answer

Moment of inertia

Answer

Moment of force

Answer

None of these

Question 48

48. Moment of inertia depends on mass and also on

Answer

None of these

Question 49

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

Answer

Angular acceleration

Answer

Linear acceleration

Answer

No acceleration

Answer

None of these

Question 50

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

Question 51

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

Question 52

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

Answer

Rotating body

Answer

Revolving body

Answer

Spiming body

Answer

None of these

Question 53

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

Answer

Very Smaller

Answer

None of these

Question 54

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

Answer

Cosmological level

Answer

Microscope level

Answer

Submicroscopic level

Question 55

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

Answer

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

Answer

Varies with time

Answer

Remains constant

Question 56

56. The angular momentum is a vector quantity with due

Answer

Perpendicular to the axis of rotation

Answer

Along the axis of rotation

Answer

At the axis of rotation

Answer

None of these

Question 57

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

Answer

Constant velocity

Answer

Constant acceleration

Answer

Constant kinetic energy

Answer

Constant displacement

Question 58

58. Angular momentum is

Answer

Vector (axial)

Answer

Vector (polar)

Answer

None of these

Question 59

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

Answer

Potential energy

Answer

Kinetic energy

Answer

Angular momentum

Answer

Linear momentum

Question 60

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

Answer

Angular momentum

Answer

Linear momentum

Answer

Angular kinetic energy

Answer

Linear kinetic energy

Question 61

61. A couple produces

Answer

Purely linear motion

Answer

Purely rotational motion

Answer

Linear and rotational motion

Question 62

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

Answer

When a body is rotating

Answer

When velocity of body is in a straight line

Answer

When velocity is in a straight line

Answer

None of these

Question 63

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

Question 64

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

Answer 157

Reduce friction

Answer 158

Generate required centripetal force

Answer 159

Reduce apparent weight

Answer 160

Reduce speed

Answer 161

Increases as the body moves away from the point

Answer 162

Decreases as the body moves away from the point

Answer 163

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

Answer 164

Angular momentum remains conserved

Answer 165

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

Answer 166

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

Answer 167

All of these

Answer 168

Linear momentum is constant

Answer 169

Velocity is constant

Answer 170

It moves in a circular path

Answer 171

None of these

Answer 172

Centripetal force

Answer 173

Centrifugal force

Answer 174

Gravitational force

Answer 175

All of these

Answer 176

Velocity and acceleration remain constant

Answer 177

Kinetic energy remain constant

Answer 178

Speed and acceleration change

Answer 179

Only velocity change, acceleration remain constant

Answer 180

Linear momentum

Answer 181

Angular momentum

Answer 182

Kinetic energy

Answer 183

Mass Angular momentum

Answer 184

Mass and angular velocity

Answer 185

Centripetal force and radius

Answer 186

Linear velocity and angular velocity

Answer 187

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

Answer 188

The tangent to the circular path

Answer 189

The inward radius

Answer 190

The outward radius

Answer 191

The axis of rotation

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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