Work, Energy and Power (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 24 - 27 of 63

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Question number: 24

» Work, Energy and Power » Potential Energy

MCQ▾

Question

A tennis ball dropped from a height of 5 m rebounds only 2.5 f meter after hitting the ground. What fraction of energy is lost in the impact?

Choices

Choice (4) Response

a.

1.26

b.

0.466

c.

0.5

d.

2.45

Question number: 25

» Work, Energy and Power » Power

MCQ▾

Question

A bus of mass 2000 kg has an engine which produces a constant power of 50 kW. If the resistance to motion, assumed constant is 2000 N. The maximum speed at which the bus can travel on level road and the acceleration when it is travelling at 15 m/s, will respectively be –

Choices

Choice (4) Response

a.

10 m/s, 5m/s 2

b.

25 m/s, 0.6666 m/s 2

c.

1.0 m/s, 50 m/s 2

d.

50 m/s, 1.0 m/s 2

Question number: 26

» Work, Energy and Power » Elastic and Inelastic Collisions

MCQ▾

Question

Which of the following statements is false for collisions-

(1) Momentum is conserved in elastic collisions but not in inelastic collisions.

(2) Total-kinetic energy is conserved in elastic collisions but momentum is not conserved.

(3) Total kinetic energy and momentum both are conserved in all types of collisions

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

Select the correct answers and mark it according to the following codes

Choices

Choice (4) Response

a.

1 and 3 are correct

b.

1 and 2 are correct

c.

1, 2 and 3 are correct

d.

2 and 4 are correct

Question number: 27

» Work, Energy and Power » Work Done

MCQ▾

Question

A body is acted upon by a force F = 2i + 1j + k. The work done by the force in displacing it from (0, 0, 0) to (0, 0, 4m) will be

Choices

Choice (4) Response

a.

8 J

b.

12 J

c.

7 J

d.

10 J

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