NEET Physics Collisions MCQs Set A

a) Total kinetic energy is not conserved but momentum is conserved in inelastic collisions

b) Total kinetic energy is conserved in elastic collisions but momentum is not conserved in elastic collisions

c) Momentum is conserved in elastic collisions but not in inelastic collisions

d) Kinetic energy and momentum both are conserved in all types of collisions

Answer: Total kinetic energy is not conserved but momentum is conserved in inelastic collisions

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: perfectly inelastic collision

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: kinetic energy

Question: The coefficient of restitution e for a perfectly elastic collision is

a) 1

b) 0

c) –1

d) None of these

Answer: 1

Question: The coefficient of restitution e for a perfectly inelastic collision is

a) 0

b) 1

c) –1

d) None of these

Answer:  0

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: total K.E. of colliding bodies decreases

Question: In elastic collision, 100% energy transfer takes place when

a)

b)

c)

d)

Answer:

Question:

a)

b)

c)

d)

Answer:

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: Assertion is correct, reason is correct; reason is not a correct explanation for assertion

More Questions.........................................

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: Conservation of energy is valid during this period

Question:  A rubber ball is dropped from a height of 5m on a plane, where the acceleration due to gravity is not shown. On bouncing it rises to 1.8 m. The ball loses its velocity on bouncing by a factor of

a)

b)

c)

d)

Answer:

Question:

a)

b)

c)

d)

Answer:

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: they will move in mutually perpendicular directions

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: Assertion is incorrect, reason is correct

Question:  A ball of mass m moving with a constant velocity strikes against a ball of same mass at rest. If e = coefficient of restitution, then what will be the ratio of velocity of two balls after collision?

a)

b)

c)

d)

Answer:

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: 60 J

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: 1, 0.5

Question:  The block of mass M moving on the frictionless horizontal surface collides with the spring of spring constant k and compresses it by length L. The maximum momentum of the block after collision is

a)

b)

c)

d) zero

Answer:

Question:

a) 8

b) 6

c) 4

d) 2

Answer:  8

Question:

a)

b)

c)

d)

Answer:

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: 800

Question:  A mass m moving horizontally (along the x-axis) with velocity v collides and sticks to mass of 3m moving vertically upward (along the y-axis) with velocity 2v. The final velocity of the combination is

a)

b)

c)

d)

Answer:

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: 9 : 1

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: None of these

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:  200 m/s