1. A point of a body or a system of particles which moves as if the total mass of the body or the system of particles were concentrated there and all the applied forces were acting at that point is called a
A. centre of gravity.
B. centre of mass.
C. centre of circle.
D. centre of rotation

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2. Increasing the moment arm, increases
A. velocity
B. momentum
C. axis of rotation.
D. torque

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3. Clockwise rotation is
A. neutral
B. negative
C. zero
D. positive

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4. The motion of trains and cars are
A. spin motion.
B. to and fro motion.
C. rotatory motion.
D. translatory motion.

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5. A body is said to be in static equilibrium when it is
A. at rest.
B. accelerated by the external force.
C. moving with uniform velocity.
D. moving uniformly in a circular path.

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6. The motion of the Moon around the Earth is an example of
A. orbital motion.
B. translatory motion.
C. vibrational motion.
D. spin motion.

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7. The point of intersection of the lines of action of the weight of all the points of body is called
A. centre of the body
B. centre of gravity of the body
C. centre of mass of the body
D. none of the above

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8. Two forces which are equal in magnitude but opposite in direction and not acting along the same line is a
A. couple
B. torque
C. rotation
D. motion

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9. If the axis of rotation does not pass through the body the rotatory motion is said to be?
A. circular motion.
B. orbital motion.
C. spin motion.
D. oscillatory motion.

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10. Rotatory motion can be Spin motion or
A. vibrational motion.
B. translatory motion.
C. translatory motion.
D. orbital motion.

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11. The centre of mass of a system of particles
A. always coincides always with the centre of gravity.
B. never coincides with the centre of gravity.
C. coincides with the centre of gravity only in a uniform gravitational field.
D. none of the above.

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12. A body is said to be in dynamic equilibrium when it
A. possess instantaneous velocity.
B. is in uniform motion along a straight line.
C. is moving with changing acceleration
D. is in uniform motion along a circular path.

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13. In translatory motion, the axes of the frame of reference of the object remains always parallel to the corresponding axes of
A. mover’s frame of reference.
B. rotator’s frame of reference.
C. None of these.
D. observer’s frame of reference.

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14. Increasing the force, increases the
A. centre of mass.
B. axis of rotation.
C. mass
D. torque

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15. Counterclockwise rotation is taken as
A. positive
B. neutral
C. zero
D. negative

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16. A body is said to be in translational equilibrium if the net force on it is
A. negative
B. positive
C. zero
D. decreasing

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17. “A body will be in equilibrium if the resultant of all the forces acting on it is zero”. This is called the
A. fourth condition of equilibrium.
B. third condition of equilibrium
C. first condition of equilibrium.
D. second condition of equilibrium

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18. To an observer on the ground the passengers and bus on a level road at constant velocity are an example of
A. static equilibrium.
B. dynamic equilibrium
C. translational equilibrium
D. rotational equilibrium

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19. If the vector sum the torques acting on it is zero, the body is said to be in?
A. rotational equilibrium.
B. dynamic equilibrium.
C. translational equilibrium.
D. static equilibrium

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20. A body in equilibrium
A. can move with constant velocity
B. can move with variable acceleration
C. can move with constant acceleration
D. is always at rest

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21. T he unit of torque is
A. Ns.
B. Nm^{-1}.
C. Ns^{-1}.
D. Nm.

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22. The torque is the vector product of two vectors force and displacement and is a vector
A. at 180° to the plane of the force and displacement.
B. at 45 ° to the plane of the force and displacement.
C. at 90° to the plane of the force and displacement.
D. at 0° to the plane of the force and displacement.

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23. To stationary observers a bridge is an example of
A. static equilibrium.
B. rotational equilibrium
C. dynamic equilibrium.
D. kinetic equilibrium.

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24. In static and dynamic equilibrium, the body does not posses any
A. linear or angular acceleration
B. linear or angular displacement
C. linear or angular momentum
D. linear or angular velocity

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25. Dynamic equilibrium is also known as
A. rotational equilibrium.
B. translatory Equilibrium.
C. static equilibrium.
D. kinetic equilibrium.