# CBSE Class 11 Physics Systems of Particles and Rotational Motion MCQs

## Systems of Particles and Rotational Motion Class 11 Physics MCQ

Class 11 Physics students should refer to the following multiple-choice questions with answers for Systems of Particles and Rotational Motion in standard 11. These MCQ questions with answers for Grade 11 Physics will come in exams and help you to score good marks

### Systems of Particles and Rotational Motion MCQ Questions Class 11 Physics with Answers

#### Question: 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

Answer: lies always on the surface of the body

#### Question: 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

Answer: relative distance between the particles

#### Question: The motion of the centre of mass depends on

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

#### Question: 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

#### Question: In rotatory motion, linear velocities of all the particles of the body are

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

#### Question: 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)

#### Question: 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

#### Question: 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

#### Question: 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

#### Question:  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

Answer: Assertion is correct, reason is correct; reason is not a correct explanation for assertion

• a) 27.0
• b) 0.4
• c) 1.3
• d) 8.0

#### Question: 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) 16
• b) 24
• c) 32
• d) 8

• a) 314
• b) 722
• c) 272
• d) 143

• a) 12
• b) 18
• c) 36
• d) 24

#### Question: A mass is revolving in a circle which is in the plane of paper. The direction of angular acceleration is

• c) tangential
• d) at right angle to angular velocity

#### Question: Which component of force contributes to the torque?

• a) Transverse component
• b) Either radial or transverse
• d) None of these

#### Question: A couple produces

• a) rotational motion
• b) linear motion
• c) both
• d) None of these

#### Question: Which of the following statements about angular momentum is correct?

• a) It is directly proportional to moment of inertia
• b) It is a scalar quantity
• c) both
• d) None of these

Answer: It is directly proportional to moment of inertia

#### Question: The wide handle of screw is based upon

• a) turning moment of force
• b) None of these
• c) law of conservation of linear momentum
• d) upon

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