MCQ on kinematics of motion

1. The force which acts along the radius of a circle and directed ...... the centre of the circle is known
as centripetal force.
(a) away from (b) towards

2. The unit of mass moment of inertia in S.I. units is
(a) m4
(b) kgf-m-s2
(c) kg-m2
(d) N-m

3. Joule is a unit of
(a) force (b) work (c) power (d) none of these

4. The energy possessed by a body, for doing work by virtue of its position, is called
(a) potential energy (b) kinetic energy
(c) electrical energy (d) chemical energy

5. When a body of mass moment of inertia I (about a given axis) is rotated about that axis with an
angular velocity, then the kinetic energy of rotation is
(a) 0.5 I.ω (b) I.ω (c) 0.5 I.ω
(d) I.ω

6. The wheels of a moving car possess
(a) potential energy only
(b) kinetic energy of translation only
(c) kinetic energy of rotation only
(d) kinetic energy of translation and rotation both.

7. The bodies which rebound after impact are called
(a) inelastic bodies (b) elastic bodies

8. The coefficient of restitution for inelastic bodies is
(a) zero (b) between zero and one
(c) one (d) more than one

9. Which of the following statement is correct ?
(a) The kinetic energy of a body during impact remains constant.
(b) The kinetic energy of a body before impact is equal to the kinetic energy of a body after impact.
(c) The kinetic energy of a body before impact is less than the kinetic energy of a body after
impact.
(d) The kinetic energy of a body before impact is more than the kinetic energy of a body after
impact.

10. A body of mass m moving with a constant velocity v strikes another body of same mass m moving
with same velocity but in opposite direction. The common velocity of both the bodies after collision
is
(a) v (b) 2 v (c) 4 v (d) 8 v

ANSWERS
1. (b) 2. (c) 3. (b) 4. (a) 5. (c)
6. (d) 7. (b) 8. (a) 9. (d) 10. (b)