MCQ on velocity of mechanism

1.The total number of instantaneous centres for a mechanism consisting of n links are
(a)n / 2
(b) n
(c)(n-1) / 2
(d) n (n - 1) /2

2. According to Aronhold Kennedy’s theorem, if three bodies move relatively to each other, their
instantaneous centres will lie on a
(a) straight line (b) parabolic curve
(c) ellipse.          (d) none of these

3. In a mechanism, the fixed instantaneous centres are those centres which
(a) remain in the same place for all configurations of the mechanism
(b) vary with the configuration of the mechanism
(c) moves as the mechanism moves, but joints are of permanent nature
(d) none of the above

4. The instantaneous centres which vary with the configuration of the mechanism, are called
(a) permanent instantaneous centres
(b) fixed instantaneous centres
(c) neither fixed nor permanent instantaneous centres
(d) none of these

5. When a slider moves on a fixed link having curved surface, their instantaneous centre lies
(a) on their point of contact (b) at the centre of curvature
(c) at the centre of circle (d) at the pin joint

ANSWERS
1. (d) 2. (a) 3. (a) 4. (c) 5. (b)

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)

MCQ on kinematics of motion

1. The unit of linear acceleration is
(a) kg-m (b) m/s (c) m/s
(d) rad/s2

2. The angular velocity (in rad/s) of a body rotating at N r.p.m. is
(a) π N/60 (b) 2 π N/60 (c) π N/120 (d) π N/180

3. The linear velocity of a body rotating at ω rad/s along a circular path of radius r is given by
(a) ω.r (b) ω/r (c) ω2.r (d) ω2/r

4. When a particle moves along a straight path, then the particle has
(a) tangential acceleration only (b) centripetal acceleration only
(c) both tangential and centripetal acceleration

5. When a particle moves with a uniform velocity along a circular path, then the particle has
(a) tangential acceleration only (b) centripetal acceleration only
(c) both tangential and centripetal acceleration

ANSWERS
1. (c) 2. (b) 3. (a) 4. (a) 5. (b)