Work, Energy and Power Test

Result

Work, Energy and Power Test - 54

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Weekly Quiz Competition

Question 1
4 / -1

Two bodies of masses 0.1 kg and 0.4 kg move towards each other with the velocities 1 m/s and 0.1 m/s respectively, after collision they stick together. In 10 sec the combined mass travels

A
120 m

B
0.12 m

C
12 m

D
1.2 m

Solution
Question 2
4 / -1

A bag (mass M) hangs by a long thread and a bullet (mass m) comes horizontally with velocity v and gets caught in the bag. Then, for the combined (bag + bullet) system

A

B

C

D

Solution
Question 3
4 / -1

A 50 g bullet moving with velocity 10 m/s strikes a block of mass 950 g at rest and gets embedded in it. The loss in kinetic energy will be

A
100%

B
95%

C
5%

D
50%

Solution
Question 4
4 / -1

A

B

C

D

Solution
Question 5
4 / -1

If a skater of weight 3 kg has initial speed 32 m/s and second one of weight 4 kg has 5 m/s. After collision, they have speed (couple) 5 m/s. Then, the loss in K.E. is

A
48 J

B
96 J

C
zero

D
None of these

Solution
Question 6
4 / -1

A ball is dropped from height 10 m. Ball is embedded in sand 1 m and stops, then

A
Only momentum remains conserved

B
Only kinetic energy remains conserved

C
Both momentum and K.E. are conserved

D
Neither K.E. nor momentum is conserved
Question 7
4 / -1

A bullet of mass m moving with velocity v strikes a block of mass M at rest and gets embedded into it. The kinetic energy of the composite block will be

A

B

C

D

Solution
Question 8
4 / -1

A body of mass m₁ is moving with a velocity V. It collides with another stationary body of mass m₂. They get embedded At the point of collision, the velocity of the system

A
Increases

B
Decreases but does not become zero

C
Remains same

D
Become zero

Solution
Question 9
4 / -1

A ball hits the floor and rebounds after inelastic collision. In this case

A
The momentum of the ball just after the collision is the same as that just before the collision

B
The mechanical energy of the ball remains the same in the collision

C
The total momentum of the ball and the Earth is conserved

D
The total energy of the ball and the Earth is conserved
Question 10
4 / -1

If W₁, W₂ and W₃ represent the work done in moving a particle from A to B along three different paths 1, 2 and 3 respectively (as shown) in the gravitational field of a point mass in, find the correct relation between W₁, W₂ and W₃.

A

B

C

D