Q: When two bodies collide elastically, then
a)Kinetic energy of the system alone is conserved
b)Only momentum is conserved
c)Both energy and momentum are conserved
d)Neither energy nor momentum is conserved
Answer: (c) Both energy and momentum are conserved
Q: The coefficient of restitution for a perfectly elastic collision is
a)1
b)0
c)∞
d)-1
Answer: (a) 1
Q: Two balls at same temperature collide. What is conserved?
a)Temperature
b)Kinetic energy
c)Momentum
d)Velocity
Answer: (c) Momentum
Q: A body of mass M collides against a wall with a velocity V and retraces its path with the same speed. The change in momentum is (take the initial direction of the velocity as positive)
a)2 Mv
b)1 Mv
c)-2 Mv
d)Zero
Answer: (c) -2 Mv
Q: A shell of mass m moving with velocity v suddenly breaks into 2 pieces. The part having mass m/4 remains stationary. The velocity of the shell will be
a)(4/3)v
b)V
c)2 v
d)¾ v
Answer: (a) (4/3)v
Q: A metal ball falls from a height of 32 metres on a steel plate. If the coefficient of restriction is 0.5 to what height will the ball rise after the second bounce
a)4 m
b)8 m
c)2 m
d)16 m
Answer: (c) 2 m
Q: The principle of conservation of linear momentum can be strictly applied during a collision between two particles provided the time of impact is
a)Moderately small
b)Extremely large
c)Extremely small
d)Depends on a particular case
Answer: (b) Extremely small
Q: In an elastic collision of two particles the following is conserved
a)Speed of each particle
b)Kinetic energy of each particle
c)Total kinetic energy of both the particles
d)Momentum of each particle
Answer: (c) Total kinetic energy of both the particles
Q: A shell initially at rest explodes into two pieces of equal mass, then the two pieces will
a)Move with different velocities in different directions
b)Be at rest
c)Move with the same velocity in the same direction
d)Move with the same velocity in opposite directions
Answer: (d) Move with the same velocity in opposite directions
Q: A lead ball strikes a wall and falls down, a tennis ball having the same mass and velocity strikes the wall and bounces back. Check the correct statement.
a)The lead ball suffers a greater change in momentum compared with the tennis ball
b)The tennis ball suffers a greater change in momentum as compared with the lead ball
c)The momentum of the lead ball is greater than that of the tennis ball
d)Both suffer an equal change in momentum
Answer: (b) The tennis ball suffers a greater change in momentum as compared with the lead ball
