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

NCERTCOURSE.COM given here the NCERT chapter-wise Multiple Choice Questions from Class 11 Physics book Chapter 7 System of Particles and Rotational Motion with Answers Pdf free download. This may assist you to understand and check your knowledge about the chapters. Students also can take a free test of the Multiple Choice Questions of System of Particles and Rotational Motion. Each question has four options followed by the right answer. These MCQ Questions are selected supported by the newest exam pattern as announced by CBSE.

## Q1. When a dish containing mercury and water is rotated about a vertical axis, the outer portion of the dish contains :

(i) Water
(ii) Mercury
(iii) Mixture of water and mercury
(iv) Nothing

(ii) Mercury

(i) l1 > l2
(ii) l1 >> l2
(iii) l1 < l2
(iv) l1 = l2

(iii) l1 < l2

(i) 40%
(ii) 20%
(iii) 10%
(iv) 21%

(iv) 21%

## Q4. Centre of mass of the earth and the moon system lies

(i) closer to the earth
(ii) closer to the moon
(iii) at the mid-point of line joining the earth and the moon
(iv) cannot be predicted

(i) closer to the earth

(i) 2 : 1
(ii) 1 : 2
(iii) 1 : 4
(iv) 1 : 1

(ii) 1 : 2

## Q6. Angular momentum is

(i) A scalar
(ii) A polar vector
(iii) A scalar as well as vector
(iv) An axial vector

(iv) An axial vector

## Q7. A dancer on ice spins faster when she folds here arms. This is due to

(i) Increases in energy and increase in angular momentum
(ii) Decrease in friction at the skates
(iii) Constant angular momentum and increase in kinetic energy
(iv) Increase in energy an decreases in angular momentum

(iii) Constant angular momentum and increase in kinetic energy

## Q8. In rotatory motion, linear velocities of all the particles of the body are

(i) different
(ii) zero
(iii) cannot say
(iv) None of these

(i) different

## Q9. Without weighing how will you distinguish between the two identical balls of same material, but one being solid and the other being hollow

(i) by spinning them by equal torque.
(ii) by rolling them down an inclined plane in air.
(iii) by determining their M.I. about the centre.
(iv) all of the above.

(iv) all of the above.

(i) 3/2 mv²
(ii) 1/2 mv²
(iii) mv²
(iv) 5/2 mv²

(iii) mv²

(i) t = I a
(ii) F = ma
(iii) L = I w
(iv) I = t a

(iv) I = t a

## Q12. The motion of the centre of mass depends on

(i) total external forces
(ii) total internal forces
(iii) None of these
(iv) Both

(i) total external forces

## Q13. The moment of inertia of a body does not depend upon

(i) the mass of the body
(ii) the axis of rotation of the body
(iii) the distribution of the mass in the body
(iv) the angular velocity of the body

(iv) the angular velocity of the body

## Q14. The kinetic energy of a body is 4 joule and its moment of inertia is 2 kg m² then angular momentum is

(i) 4 kg m²/sec
(ii) 5 kg m²/sec
(iii) 6 kg m²/sec
(iv) 7 kg m²/sec

(i) 4 kg m²/sec

## Q15. A particle moves on a circular path with decreasing speed. Choose the correct statement.

(i) Angular momentum remains constant.
(ii) Acceleration is towards the centre.
(iii) Particle moves on a spiral path with decreasing radius.
(iv) The direction of angular momentum remains constant.

(iv) The direction of angular momentum remains constant

## Q16. The centre of mass of a body

(i) lies always on the surface of the body
(ii) lies always inside the body
(iii) may lie within, outside on the surface of the body
(iv) lies always outside the body

(i) lies always on the surface of the body

Q17. A body is under the action of two equal and oppositely directed forces and the body is rotating with constant acceleration. Which of the following cannot be the separation between the lines of action of the forces?

(i) zero
(ii) 0.25m
(iii) 0.4m
(iv) 1.0m

(i) zero

## Q18. By keeping moment of inertia of a body constant, if we double the time period, then angular momentum of body

(i) Remains constant
(ii) Becomes half
(iii) Doubles

(ii) Becomes half

(i) 2.5
(ii) 5
(iii) 1.5
(iv) 3

(i) 2.5

## Q20. Three identical balls each of radius 10cm and mass 1kg each are placed touching each other on a horizontal surface. Where is their C.M. located?

(i) At the centre of one ball.
(ii) On the horizontal surface.
(iii) At the point of contact of any two spheres.
(iv) None of these.

(ii) On the horizontal surface.

## Q21. The kinetic energy of a body is 4 joule and its moment of inertia is 2 kg m² then angular momentum is

(i) 4 kg m²/sec
(ii) 5 kg m²/sec
(iii) 6 kg m²/sec
(iv) 7 kg m²/sec

(i) 4 kg m²/sec

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