21)

In case of rigid body the distance between all pairs of particles of such body

Class 11 Physics

A)

Both a and b

B)

Do not changes

C)

Changes

D)

None

22)

In pure translational motion at any instant of time, all particles of the body have

Class 11 Physics

A)

Same velocity

B)

Changing velocity

C)

Different velocity

D)

None

23)

The line or fixed axis about which the body is rotating is called as

Class 11 Physics

A)

Rotational pole

B)

Axis of rotation

C)

Axis

D)

None

24)

The point at which whole mass of body is supposed to be concentrated is called as

Class 11 Physics

A)

Both a and b

B)

Centre of mass

C)

Centre of gravity

D)

None