Q.1

A person is sitting near the edge of a rotating platform. When he walks towards the center, then

moment of inertia of system increases

angular velocity of platform decreases

angular velocity of platform increases

angular velocity of platform remains unchanged

Q.2

When a sphere rolls without slipping the ratio of its kinetic energy of translation to its total kinetic energy is

1 : 7

1 : 2

2 : 5

5 : 7

Q.3

A wheel of mass 10 kg has a moment of inertia of 160 kg – m2 about its own axis. The radius of gyration is

10 m

4 m

5 m

6 m

Q.4

When a steady torque is acting on a body, it

continues in its state of rest or uniform motion along a straight line

gets linear acceleration

gets angular acceleration

rotates at a constant speed

Q.5

When a particle is rotating in a plane about a fixed point its angular momentum is directed along

the radius

the tangent to orbit

line at an angle of 45o to the plane of rotation

the axis of rotation

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