NEET Physics Laws of Motion MCQs Set A

Question. A metre scale is moving with uniform velocity. This implies
(a) the force acting on the scale is zero and the torque acting about centre of mass of the scale is also zero
(b) the total force acting on it need not be zero but the torque on it is zero
(c) neither the force nor the torque need to be zero
(d) the force acting on the scale is zero, but a torque about the centre of mass can act on the scale

Answer: A

Question. Conservation of momentum in a collision between particles can be understood from
(a) both Newton's second and third law
(b) Newton's second law only
(c) Newton's first law only
(d) Conservation of energy

Answer: A

Question. A hockey player is moving northward and suddenly turns westward with the same speed to avoid an opponent. The force that acts on the player is
(a) frictional force along sotuh-west
(b) muscle force along south-west
(c) muscle force along southward
(d) frictional force along westward

Answer: A

Question. A mass is hanging on a spring balance which is kept in a lift. The lift ascends. The spring balance will show in its readings
(a) an increase
(b) a decrease
(c) no change
(d) a change depending on its velocity

Answer: A

Question. A ball of mass 0.5 kg moving with a velocity of 2 m/sec strikes a wall normally and bounces back with the same speed. If the time of contact between the ball and the wall is one millisecond, the average force exerted by the wall on the ball is
(a) 2000 newton
(b) 5000 newton
(c) 1000 newton
(d) 125 newton

Answer: A