Work, Energy and Power (NEET Physics): Questions 42 - 45 of 63

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Question number: 42

» Work, Energy and Power » Work Done

MCQ▾

Question

The work done in pulling a body of mass 3 kg along an inclined plane (angle 60°) with coefficient of friction 0.2 through 2 m, will be -

Choices

Choice (4) Response

a.

98.08 J

b.

56.80 J

c.

56.08 J

d.

65.08 J

Question number: 43

» Work, Energy and Power » Kinetic Energy

MCQ▾

Question

Which of the following hold when two particles of masses m 1 and m 2 undergo elastic collision?

(1) When m, = m 2 and m 2 is stationary, there is maximum transfer of kinetic energy in head on collision

(2) When m i = va 2 and m 2 is stationary, there is maximum transfer of momentum in head on collision

(3) When m l > > m 2 and m 2 is stationary, after head on collision m 2 moves with twice the velocity of m 1

(4) When the collision is oblique and m 1 = m 2 with m 2 stationary, after the collision the particle move in opposite directions.

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

Choices

Choice (4) Response

a.

2 and 4 are correct

b.

1 and 2 are correct

c.

1 and 3 are correct

d.

1, 2 and 3 are correct

Question number: 44

» Work, Energy and Power » Power

MCQ▾

Question

The power output of a 92 U 235 reactor if it takes 30 days to use up 2 kg of fuel and if each fission gives 185 MeV of energy (Avogadro number = 6 x 10 23 /mole) will be –

Choices

Choice (4) Response

a.

58.4 MW

b.

584 W

c.

5.84 MW

d.

5840 MW

Question number: 45

» 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 = 2 m. Work done in joule is -

Choices

Choice (4) Response

a.

7

b.

3

c.

2

d.

13

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