Work, Energy and Power (NEET Physics): Questions 57 - 60 of 61

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Question number: 57

» Work, Energy and Power » Work-Energy Theorem

MCQ▾

Question

The earth circles the sun once a year. How much work would have to be done on the earth to bring it to rest relative to the sun, (ignore the rotation of earth about -its own axis) Given that mass of the earth is 6 x 10 24 kg and distance between the sun and earth is 1.5 x 10 8 km-

Choices

Choice (4) Response

a.

1.9 x 10 23

b.

1.9 x 10 24

c.

2.7 x 10 24

d.

2.7 x 10 33

Question number: 58

» Work, Energy and Power » Kinetic Energy

MCQ▾

Question

A bullet is fired from the gun. The gun recoils, the kinetic energy of the recoil shall be

Choices

Choice (4) Response

a.

double that of the kinetic energy of the bullet

b.

Equal to the kinetic energy of the bullet

c.

less than the kinetic energy of the bullet

d.

greater than the kinetic energy of the bullet

Question number: 59

» Work, Energy and Power » Potential Energy

MCQ▾

Question

A tennis ball dropped from a height of 6 m rebounds only 2.1 f meter after hitting the ground. What fraction of energy is lost in the impact?

Choices

Choice (4) Response

a.

0.65

b.

0.5

c.

0.466

d.

1.26

Question number: 60

» Work, Energy and Power » Work Done

MCQ▾

Question

For a reversible process, unnecessary conditions are

(1) In the whole cycle of the system, the loss of any type

(2) That the process should be too fast

(3) That the process should be slow so that the working substance should remain in thermal and mechanical equilibrium with the surroundings

(4) The loss of energy should be zero and it should be quasi-static

Select the correct answers and mark it according to the following is:

Choices

Choice (4) Response

a.

2 and 4 are correct

b.

1, 2 and 3 are correct

c.

1 and 2 are correct

d.

1 and 3 are correct

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