Check the below NCERT MCQ Questions for Class 11 Physics Chapter 7 System of Particles and Rotational Motion with Answers Pdf free download. MCQ Questions for Class 11 Physics with Answers were prepared based on the latest exam pattern. We have provided System of Particles and Rotational Motion Class 11 Physics MCQs Questions with Answers to help students understand the concept very well.

## System of Particles and Rotational Motion Class 11 MCQs Questions with Answers

System Of Particles And Rotational Motion MCQ Question 1.
A body of M.I. 3 kg m² rotating with an angular velocity 2 rad/s has the same K.E. as a mass of 12 kg moving with a velocity of
(a) 1 m/s
(b) 2 m/s
(c) 4 m/s
(d) 8 m/s

System Of Particles And Rotational Motion Class 11 MCQ Question 2.
A particle performing uniform circular motion has angular momentum L. If its angular frequency is doubled and its kinetic energy halved, then the new angular momentum is
(a) L/2
(b) L/4
(c) 2 L
(d) 4 L

Class 11 Physics Chapter 7 MCQ Question 3.
A thin uniform, circular ring is rolling down an inclined plane of inclination 300 without slipping. Its linear acceleration along the inclined plane will be
(a) g/2
(b) g/3
(c) g/4
(d) 2g/3

Rotational Motion Class 11 MCQ Question 4.
Moment of inertia depends on
(a) Distribution of particles
(b) Mass
(c) Position of axis of rotation
(d) All of these

MCQ Questions For Class 11 Physics Chapter 7 Question 5.
Calculate the M.I. of a thin uniform ring about an axis tangent to the ring and in a plane of the ring, if its M.I. about an axis passing through the centre and perpendicular to plane is 4 kg m².
(a) 12 kg m²
(b) 3 kg m²
(c) 6 kg m²
(d) 9 kg m²

Chapter 7 Physics Class 11 MCQs Question 6.
If a body is rotating about an axis, passing through its centre of mass then its angular momentum is directed along its
(b) Tangent
(c) Circumference
(d) Axis of rotation

MCQ On System Of Particles And Rotational Motion Question 7.
A solid cylinder of mass 20 kg, has length 1 metre and radius 0.5m. then its momentum of inertia in kg m² about its geometrical axis is
(a) 2.5
(b) 5
(c) 1.5
(d) 3

Ch 7 Physics Class 11 MCQ Question 8.
A particle moves on a circular path with decreasing speed. Choose the correct statement.
(a) Angular momentum remains constant.
(b) Acceleration is towards the centre.
(c) Particle moves on a spiral path with decreasing radius.
(d) The direction of angular momentum remains constant.

Answer: (d) The direction of angular momentum remains constant.

Class 11 Physics Ch 7 MCQ Question 9.
The M.I. of uniform circular disc about a diameter is I. its M.I. about an axis perpendicular to its plane passing through a point on its rim will be
(a) 4 I
(b) 6 I
(c) 8 I
(d) 9 I

MCQ On Rotational Motion Class 11 Question 10.
Which is the wrong relation from the following?
(a) t = I a
(b) F = ma
(c) L = I w
(d) I = t a

Answer: (d) I = t a

Class 11 Physics Chapter 7 MCQ With Answers Question 11.
A solid sphere is rotating in free space. If the radius of the sphere is increased keeping mass same, which one of the following will not be affected?
(a) Moment of inertia
(b) Angular momentum
(c) Angular velocity
(d) Rotational kinetic energy

Class 11 System Of Particles And Rotational Motion MCQ Question 12.
A particle moves on a circular path with decreasing speed. Choose the correct statement.
(a) Angular momentum remains constant.
(b) Acceleration is towards the centre.
(c) Particle moves on a spiral path with decreasing radius.
(d) The direction of angular momentum remains constant.

Answer: (d) The direction of angular momentum remains constant.

Class 11 Physics System Of Particles And Rotational Motion MCQ Question 13.
A body of M.I. 3 kg m² rotating with an angular velocity 2 rad/s has the same K.E. as a mass of 12 kg moving with a velocity of
(a) 1 m/s
(b) 2 m/s
(c) 4 m/s
(d) 8 m/s

Class 11 Rotational Motion MCQ Question 14.
A hollow cylinder and a solid cylinder having different mass diameter are released from rest simultaneously from the of an inclined plane. Which will reach the bottom first?
(a) solid cylinder
(b) cant be determined without knowing their masses
(c) hollow cylinder
(d) cant be determined without knowing their diameters

MCQ Of Chapter 7 Physics Class 11 Question 15.
Which is the wrong relation from the following?
(a) t = I a
(b) F = ma
(c) L = I w
(d) I = t a

Answer: (d) I = t a

MCQ Of Rotational Motion Class 11 Question 16.
If I, a and t are the moment of inertia, angular acceleration and torque respectively of a body rotating about any axis with angular velocity w, then
(a) t = Ia
(b) t = Iw
(c) I = tw
(d) a = Iw

Chapter 7 Class 11 Physics MCQ Question 17.
A dancer on ice spins faster when she folds here arms. This is due to
(a) Increases in energy and increase in angular momentum
(b) Decrease in friction at the skates
(c) Constant angular momentum and increase in kinetic energy
(d) Increase in energy an decreases in angular momentum

Answer: (c) Constant angular momentum and increase in kinetic energy

System Of Particles And Rotational Motion MCQ Questions Question 18.
The moment of inertia of a uniform semicircular disc of mass M and radius about a line perpendicular to the plane of the disc through the centre is
(a) (2/5) Mr²
(b) (1/4) Mr power 2
(c) (1/2) Mr²
(d) Mr²

Rotational Motion MCQ With Solutions Question 19.
A particle moves for 20 s with velocity 3 m/s and then moves with velocity 4 m/s for another 20 s and finally moves with velocity 5 m/s for next 20 s. what is the average velocity of the particle?
(a) 3 m/s
(b) 4 m/s
(c) 5 m/s
(d) Zero

Chapter 7 Physics Class 11 MCQ Question 20.
For increasing the angular velocity of an object by 10%, the kinetic energy has to be increased by
(a) 40%
(b) 20%
(c) 10%
(d) 21%