Work, Energy and Power Test

Result

Work, Energy and Power Test - 50

Score
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Weekly Quiz Competition

Question 1
4 / -1

A smooth sphere of mass M moving with velocity u directly collides elastically with another sphere of mass in at rest. After collision their final velocities are V and v respectively. The value of u is

A

B

C

D

Solution
Question 2
4 / -1

A body of mass m having an initial velocity v, makes head on collision with a stationary body of mass M. After the collision, the body of mass m comes to rest and only the body having mass M moves. This will happen only when

A

B

C

D
Question 3
4 / -1

A

B

C

D
zero
Question 4
4 / -1

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 other shell will be

A
v

B
2v

C

D

Solution
Question 5
4 / -1

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

A
16/25

B
2/5

C
3/5

D
9/25

Solution
Question 6
4 / -1

A

B

C

D

Solution
Question 7
4 / -1

A ball of mass 10 kg is moving with a velocity of 10 m/s. It strikes another ball of mass 5 kg which is moving in the same direction with a velocity of 4 m/s. If the collision is elastic, their velocities after the collision will be, respectively

A
6 m/s, 12 m/s

B
12 m/s, 6 m/s

C
12 m/s, 10 m/s

D
12 m/s, 25 m/s

Solution
Question 8
4 / -1

A body of mass 2 kg collides with a wall with speed 100 m/s and rebounds with same speed. If the time of contact was 1/50 second, the force exerted on the wall is

A
8 N

B

C
4 N

D

Solution
Question 9
4 / -1

A body falls on a surface of coefficient of restitution 0.6 from a height of 1 m. Then, the body rebounds to a height of

A
0.6 m

B
0.4 m

C
1 m

D
0.36 m

Solution
Question 10
4 / -1

A hail is dropped from a height h. lithe coefficient of restitution he e, then to what height will it rise after jumping twice from the ground

A
eh/2

B
2eh

C

D

Solution