MCQ Questions for Class 11 Physics Chapter 7 System of Particles and Rotational Motion with Answers

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.

Q1. 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

(a) 1 m/s

Q2. 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

(b) L/4

Q3. 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

(a) g/2

Q4. Moment of inertia depends on

(a) Distribution of particles
(b) Mass
(c) Position of axis of rotation
(d) All of these

(d) All of these

Q5. 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

(c) 6 kg m²

Q6. If a body is rotating about an axis, passing through its centre of mass then its angular momentum is directed along its

(a) Radius
(b) Tangent
(c) Circumference
(d) Axis of rotation

(d) Axis of rotation

Q7. 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

(a) 2.5

Q8. 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.

(d) The direction of angular momentum remains constant.

Q9. The centre of mass of a body

a) lies always on the surface of the body
b) lies always inside the body
c) may lie within, outside on the surface of the body
d) lies always outside the body

a) lies always on the surface of the body

Q10. The position of centre of mass of a system of particles does not depend upon the

a) relative distance between the particles
b) position of the particles
c) symmetry of the body
d) mass of particles

a) relative distance between the particles

Q11. The motion of the centre of mass depends on

a) total external forces
b) total internal forces
c) None of these
d) Both

a) total external forces

Q12. The centre of mass of two particles lies on the line

a) joining the particles
b) perpendicular to the line joining the particles
c) at any angle to this line
d) None of these

a) joining the particles

Q13. In rotatory motion, linear velocities of all the particles of the body are

a) different
b) zero
c) cannot say
d) None of these

a) different

Q14. If the resultant of all external forces is zero, then velocity of centre of mass will be

a) zero
b) neither (a) nor (b)
c) constant
d) either (a) or (b)

a) zero

Q15. In rotation of a rigid body about a fixed axis, every …A…of the body moves in a …B…, which lies in a plane …C… to the axis and has its centre on the axis. Here, A, B and C refer to

a) particle, circle and perpendicular
b) particle perpendicular and perpendicular
c) circle, particle and perpendicular
d) particle, perpendicular and circle

a) particle, circle and perpendicular

Q16. Centre of mass of the earth and the moon system lies

a) closer to the earth
b) closer to the moon
c) at the mid-point of line joining the earth and the moon
d) cannot be predicted

a) closer to the earth

Q17. A stick is thrown in the air and lands on the ground at some distance from the thrower. The centre of mass of the stick will move along a parabolic path

a) in all cases
b) only if the stick is uniform
c) only if the stick has linear motion but no rotational motion
d) only if the stick has a shape such that its centre of mass is located at some point on it and not outside it

a) in all cases

Q18. Assertion : The centre of mass of an isolated system has a constant velocity.
Reason : If centre of mass of an isolated system is already at rest, it remains at rest.

a) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
b) Assertion is correct, reason is correct; reason is a correct explanation for assertion.
c) Assertion is incorrect, reason is correct
d) Assertion is correct, reason is incorrect

a) Assertion is correct, reason is correct; reason is not a correct explanation for assertion

Q19. Concrete mixture is made by mixing cement, stone and sand in a rotating cylindrical drum. If the drum rotates too fast, the ingredients remain stuck to the wall of the drum and proper mixing of ingredients does not take place. The maximum rotational speed of the drum in revolutions per minute (rpm) to ensure proper mixing is close to : (Take the radius of the drum to be 1.25 m and its axle to be horizontal):

a) 27.0
b) 0.4
c) 1.3
d) 8.0

a) 27.0

Q20. Angular velocity of each particle of a rotating rigid body about axis of rotation is

a) same
b) different
c) depends on relative position
d) None of these

a) same

Q21. A wheel rotates with a constant acceleration of 2.0 radian/sec2. If the wheel starts from rest, the number of revolutions it makes in the first ten seconds will be approximately

a) 16
b) 24
c) 32
d) 8

a) 16

Q22. A wheel has a speed of 1200 revolutions per minute and is made to slow down at a rate of 4 radians/s2. The number of revolutions it makes before coming to rest is

a) 314
b) 722
c) 272
d) 143

a) 314

Class 11 Physics MCQs Questions with Answers Chapter Wise PDF Download

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