NEET Physics Collisions MCQs Set 01

Question. When after collision the deformation is not relived and the two bodies move together after the collision, it is called
(a) perfectly inelastic collision
(b) perfectly elastic collision
(c) inelastic collision
(d) elastic collision

Answer: A

Question. In an inelastic collision, which of the following does not remain conserved?
(a) kinetic energy
(b) Momentum
(c) Total energy
(d) Neither momentum nor kinetic energy

Answer: A

Question. The coefficient of restitution e for a perfectly elastic collision is
(a) 1
(b) 0
(c) –1
(d) None of these

Answer: A

Question. The coefficient of restitution e for a perfectly inelastic collision is
(a) 0
(b) 1
(c) –1
(d) None of these

Answer: A

Question. In case of elastic collision, at the time of impact
(a) total K.E. of colliding bodies decreases
(b) total momentum of colliding bodies decreases
(c) total K.E. of colliding bodies increases
(d) total K.E. of colliding bodies is conserved

Answer: A

Question. Assertion : If collision occurs between two elastic bodies their kinetic energy decreases during the time of collision.
Reason : During collision intermolecular space decreases and hence elastic potential energy increases.
(a) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(b) Assertion is correct, reason is incorrect
(c) Assertion is incorrect, reason is correct
(d) Assertion is correct, reason is correct; reason is a correct explanation for assertion

Answer: A

Question. Before a rubber ball bounces off from the floor, the ball is in contact with the floor for a fraction of second. Which of the following statements is correct?
(a) Conservation of energy is valid during this period
(b) Conservation of energy is not valid during this period
(c) As ball is compressed, kinetic energy is converted to compressed potential energy
(d) None of these

Answer: A

Question. A particle A suffers an oblique elastic collision with a particle B that is at rest initially. If their masses are the same, then after collision
(a) they will move in mutually perpendicular directions
(b) A continues to move in the original direction while B remains at rest
(c) they will move in opposite directions
(d) A comes to rest and B starts moving in the direction of the original motion of A

Answer: A

Question. Assertion : In an elastic collision of two billiard balls, the total kinetic energy is conserved during the short time of collision of the balls (i.e., when they are in contact).
Reason : Energy spent against friction follow the law of conservation of energy
(a) Assertion is incorrect, reason is correct
(b) Assertion is correct, reason is incorrect
(c) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(d) Assertion is correct, reason is correct; reason is a correct explanation for assertion

Answer: A

Question. A metal ball of mass 2 kg moving with a velocity of 36 km/h has a head on collision with a stationary ball of mass 3 kg. If after the collision, the two balls move together, the loss in kinetic energy due to collision is
(a) 60 J
(b) 40 J
(c) 100 J
(d) 140 J

Answer: A

Question. A ball moving with velocity 2 m/s collides head on with another stationary ball of double the mass. If the coefficient of restitution is 0.5, then their velocities (in m/s) after collision will be
(a) 1, 0.5
(b) 0, 2
(c) 1, 1
(d) 0, 1

Answer: A

Question. A mass of 20 kg moving with a speed of 10m/s collides with another stationary mass of 5 kg. As a result of the collision, the two masses stick together. The kinetic energy of the composite mass will be
(a) 800
(b) 1000
(c) 1200
(d) 600

Answer: A

Question. A body of mass m moving with velocity v collides head on with another body of mass 2m which is initially at rest. The ratio of K. E. of colliding body before and after collision will be
(a) 9 : 1
(b) 4 : 1
(c) 2 : 1
(d) 1 : 1

Answer: A

Question. An object of mass 2.0 kg makes an elastic collision with another object of mass M at rest and continues to move in the original direction but with one-fourth of its original speed. What is the value of M?
(a) None of these
(b) 1.0 kg
(c) 0.75 kg
(d) 1.2 kg

Answer: A

Question. A bullet of mass 20g and moving with 600 m/s collides with a block of mass 4 kg hanging with the string. What is velocity of bullet when it comes out of block, if block rises to height 0.2 m after collision ?
(a) 200 m/s
(b) 150 m/s
(c) 400 m/s
(d) 300 m/s

Answer: A