Kinematics of Rotational Motion, Class 11 Physics NCERT Solutions

1. There will be total 20 MCQ in this test.
2. Please keep a pen and paper ready for rough work but keep your books away.
3. The test will consist of only objective type multiple choice questions requiring students to mouse-click their correct choice of the options against the related question number.
4. No negative marking for incorrect choice.
5. Please click on “Finish the Test” when you want to exit.
6. All the best – Happy Studying

1. Direction of linear velocity of a particle rotating in a circular motion is :

Along the tangent

Along the radius away from the centre

Along the axis of rotation

Along the radius of the centre

Your comments:

Question 1 of 20

2. A ball is under the effect of circular motion about a perpendicular axis with respect to the reference direction. The angular position (in radians) is given by the following function
.The angular position when angular velocity is zero is

1.96 radians

0.99 radians

1.06 radians

2.96 radians

Your comments:

Question 2 of 20

3. Let H and E respectively be the angular speeds of the hour hand of a watch and that of the earth around its own axis. Compare the angular speeds of the earth and hour hand of a watch.

A

B

C

D

Your comments:

Question 3 of 20

4. The angular position of a particle (in radians), along a circle of radius 0.8 m is given by the function in time (seconds) by . The linear velocity of the particle

1.84 m/s

1.80 m/s

1.82 m/s

1.88 m/s

Your comments:

Question 4 of 20

5. All the points of a rigid body rotating about the given axis have same :

Linear acceleration

Angular velocity

Linear velocity

Angular momentum

Your comments:

Question 5 of 20

6. A mixer grinder rotates clockwise, its angular velocity will be :

Zero

Negative

Uniform but not zero

Positive

Your comments:

Question 6 of 20

7. Which of the following is not a unit of angular displacement?

Degrees

revolutions

Metre

Radian

Your comments:

Question 7 of 20

8. In an equilateral triangle of length 6 cm , three masses m₁= 40g , m₂= 60g and m₃= 60g are located at the vertices. The moment of inertia of the system about an axis along the altitude of the triangle passing through m₁ is

 

 

1080 g cm²

1020 g cm²

1000 g cm²

1100 g cm²

Your comments:

Question 8 of 20

9. A CD accelerates uniformly from rest to 200 spins per minute in 8 seconds. If the rate of change of speed is constant, determine the instantaneous acceleration in rad/s² .

200.2 πrad/s²

25 rad/ s²

20.9 rad/ s²

2.6 rad/ s²

Your comments:

Question 9 of 20

10. A boy is playing with a tire of radius 0.5m. He accelerates it from 5rpm to 25 rpm in 15 seconds. The linear acceleration of tire is

70 m/s²

7 m/s²

10 m/s²

0.07 m/s²

Your comments:

Question 10 of 20

11. The angular momentum of a body is 31.4 Js and its rate of revolution is 10 cycle per second. The momentum of inertia of the body about the axis of rotation is

0.5 kgm²

0.15 kgm²

1.5 kgm²

2.5 kgm²

Your comments:

Question 11 of 20

12. A merry- go- round ( diameter 4.0 m ) starts from rest and uniformly accelerates until it rotates at 0.8 rev/min. This occurs in 11s. Once it has reached this rate , it rotates at 0.8 rev/min uniformly . Determine the angular acceleration

7.55 x 10^-3 rad/s²

6.7 x 10^-3 rad/s²

0.083 rad/s²

0.083 rad/s

Your comments:

Question 12 of 20

13. A demo CD, 8 cm in diameter, spins 200 rev/min. Determine its linear velocity in cm/s for a point 3 cm from the center.

62.8 cm/s

20/6 cm/s

20.9 cm/s

40 π/6 cm/s

Your comments:

Question 13 of 20

14. The Equations of Rotational Motion are

A. B. C. D.

A

B

C

D

Your comments:

Question 14 of 20

15. Rotational analogue of force is :

Moment of Inertia

Radius of gyration

Gyration

Torque

Your comments:

Question 15 of 20

16. A wheel rotates with a constant acceleration of 2.0 rad/s2 . If the wheel starts from rest, the number of revolutions it makes in the first ten seconds will be approximately:

8

32

24

16

Your comments:

Question 16 of 20

17. The angular velocity of a second hand of a clock is :

π/ 30 rad/s

π/5 rad/s

2π rad/s

π /3 rad/s

Your comments:

Question 17 of 20

18. A car is decelerating uniformly from velocity v₁ to velocity v₂ while getting displaced by s. If the diameter of the wheel is d, the angular acceleration of the wheel is

A

B

C

D

Your comments:

Question 18 of 20

19. A smooth sphere A is moving on a frictionless horizontal plane with angular speed ω and center of mass velocity v. It collides elastically and head on with an identical sphere B at rest. Neglect friction everywhere. After the collision, their angular speeds are ωA and ωB respectively. Then

ω_B = ω

ω_A< ω_B

ω_A = ω

ωA = ω_B

Your comments:

Question 19 of 20

20. If n is the frequency of rotation of a body, its angular velocity is:

1/n

2π/n

n/2π

2πn

Your comments:

Question 20 of 20

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