Machine Kinematics Multiple Choice Questions and Answers – Kinetics of Motion

Questions
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

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

Answer: kg-m2
3 Joule is a unit of
A force
B work
C power
D none of the mentioned

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

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

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.

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

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

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.

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

Answer: 2 v
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