# SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

1. The unit of the radius of gyration is –

2. A couple produces –

• Only linear motion
• Only rotational motion
• Linear and rotational motion both
• No motion

Only rotational motion

3. The center of mass of a body –

• Lies always at the geometrical center
• Lies always inside the body
• Lies always outside the body
• May lie within or outside the body

May lie within or outside the body

4. Moment of linear-momentum is-

• Couple
• Angular-momentum
• Impulse
• Torque

Angular-momentum

5. S. I. unit of moment of inertia is –

• Kgm
• Kgm⁻¹
• Kgm²
• Kgm⁻²

6. Radius of gyration of a body depends upon –

• axis of rotation
• translational motion
• the shape of the body
• area of the body

axis of rotation

7. The unit of the Torque is –

8. The center of mass of a system of particles does not depend on –

• Masses of the particles
• Forces on the particles
• Position of the particles
• The Relative distance between the particles

Forces on the particles

9. Angular momentum is –

• Axial vector
• Scalar
• Polar vector
• None of these

10. Analogue of mass in rotational motion is –

• moment of inertia
• torque
• angular momentum

moment of inertia

11. Unit of angular momentum is-

• N-m
• Kg.m/s²
• Kg.m/s
• Kg²m/s²

12. The moment of inertia of a body does not depend upon-

• Axis of rotation
• Mass
• Distribution of mass
• Angular velocity

Angular velocity

13. A shell at rest explodes. The center of mass of the fragments-

• Moves along a particle path
• Moves along an elliptical path
• Moves along a straight line
• Remains at rest.