Work, Energy and Power (NEET Physics): Questions 33 - 36 of 61

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Question number: 33

» Work, Energy and Power » Work Done

MCQ▾

Question

Choose the correct options -

(1) The work done by forces may be equal to change in kinetic energy

(2) The work done by forces may be equal to change in potential energy

(3) The work done by forces may be equal to change in total energy

(4) The work done by forces must be equal to change in potential energy.

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

Choices

Choice (4) Response
a.

1, 2 and 3 are correct

b.

1 and 3 are correct

c.

1 and 2 are correct

d.

2 and 4 are correct

Question number: 34

» Work, Energy and Power » Work Done

MCQ▾

Question

A force F = (7 - 2x + 3x 2) N is applied on a 2 kg mass which displaces it from x = 0 to x = 5 m. Work done in joule is -

Choices

Choice (4) Response
a.

35

b.

135

c.

270

d.

70

Question number: 35

» Work, Energy and Power » Potential Energy

MCQ▾

Question

A body of mass 1 kg initially at rest explodes and breaks into three fragments of masses in the ratio 1: 1: 3. The two pieces of equal mass fly off perpendicular to each other with a speed of 30 m/sec each. What is the velocity of the heavier fragment?

Choices

Choice (4) Response
a.

202m/s

b.

102m/s

c.

52m/s

d.

152m/s

Question number: 36

» Work, Energy and Power » Potential Energy

MCQ▾

Question

A particle of mass 4 m which is at rest explodes into three fragments two of the fragments each of mass m are found to move each with a speed v making an angle 90° with each other. The total energy released in this explosion is –

Choices

Choice (4) Response
a.

mv2

b.

12mv2

c.

32mv2

d.

2mv2

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