Work, Energy and Power Test

Result

Work, Energy and Power Test - 30

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Weekly Quiz Competition

Question 1
4 / -1

In an inelastic collision, what is conserved

A
Kinetic energy

B
Momentum

C
Both (1) and (2)

D
Neither (1) and (2)
Question 2
4 / -1

A body of mass 2 kg is moving with velocity 10 m/s towards east. Another body of same mass and same velocity moving towards north collides with former and coalesces and moves towards north-east. Its velocity is

A
10 m/s

B
5 m/s

C
2.5 m/s

D
5√2 m/s

Solution
Question 3
4 / -1

Which of the following is not a perfectly inelastic collision

A
Striking of two glass balls

B
A bullet striking a bag of sand

C
An electron captured by a proton

D
A man jumping onto a moving cart
Question 4
4 / -1

The quantity that is not conserved in an inelastic collision is

A
Momentum

B
Kinetic energy

C
Total energy

D
All of these
Question 5
4 / -1

A ball moves in a frictionless inclined table without slipping. The work done by the table surface on the ball is

A
Positive

B
Negative

C
Zero

D
None of these
Question 6
4 / -1

A horizontal force of 5 N is required to maintain a velocity of 2 m/s for a block of 10 kg mass sliding over a rough surface. The work done by this force in one minute is

A
600 J

B
60 J

C
6 J

D
6000 J
Question 7
4 / -1

Identify the wrong statement

A
A body can have momentum without energy

B
A body can have energy without momentum

C
The momentum is conserved in an elastic collision

D
Kinetic energy is not conserved in an inelastic collision
Question 8
4 / -1

A nucleus at rest splits into two nuclear parts having same density and radii in the ratio 1 : 2. Their velocities are in the ratio

A
2 : 1

B
4 : 1

C
6 : 1

D
8 : 1

Solution
Question 9
4 / -1

The slope of kinetic energy displacement curve of a particle in motion is

A
Equal to the acceleration of the particle

B
Inversely proportional to the acceleration

C
Directly proportional to the acceleration

D
None of the above

Solution
Question 10
4 / -1

The energy required to accelerate a car from 10 m/s to 20 m/s is how many times the energy required to accelerate the car from rest to 10 m/s

A
Equal

B
4 times

C
2 times

D
3 times

Solution