Machine Kinematics Multiple Choice Questions and Answers – 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

C at the

D none of the mentioned

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Answer: 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

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Answer: kg-m²

3 Joule is a unit of

A force

B work

C power

D none of the mentioned

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Answer: work

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

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Answer: potential 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.ω²

D I.ω²

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Answer: 0.5 I.ω²

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.

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Answer: kinetic energy of translation and rotation both.

7 The bodies which rebound after impact are called

A inelastic bodies

B elastic bodies

C solid bodies

D none of the mentioned

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Answer: elastic bodies

8 The coefficient of restitution for inelastic bodies is

A zero

B between zero and one

C one

D more than one

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Answer: zero

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.

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Answer: 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

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