Work, Energy and Power (NEET Physics): Questions 28 - 32 of 61

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Question number: 28

» Work, Energy and Power » Work Done

MCQ▾

Question

A body is acted upon by a force F =-i + 2j + 3k. The work done by the force in displacing it from (0, 0, 0) to (0, 2, 4m) will be

Choices

Choice (4) Response

a.

10 J

b.

15 J

c.

12 J

d.

8 J

Question number: 29

» Work, Energy and Power » Work Done

MCQ▾

Question

A uniform rod of length 4 m and mass 20 kg is lying horizontal on the ground. The work done in keeping it vertical with one of its ends touching the ground, will be –

Choices

Choice (4) Response

a.

392 J

b.

196 J

c.

98 J

d.

784 J

Question number: 30

» Work, Energy and Power » Work Done

MCQ▾

Question

The work done in lifting water from a well of depth 6 m using a bucket of mass 0.8 kg and volume 1 liter, will be

Choices

Choice (4) Response

a.

147 J

b.

73.5 J

c.

105.84 J

d.

98 J

Question number: 31

» Work, Energy and Power » Potential Energy

Assertion-Reason▾

Assertion (Ꭺ)

A particle moves along a straight line with constant velocity. Now a constant non-zero force is applied on the particle in direction opposite to its initial velocity. After the force is applied, the net work done by this force may be zero in certain time intervals.

Reason (Ꭱ)

The work done by force acting on a particle is zero in any time interval if the force is always perpendicular to velocity of the particle.

Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

Ꭺ is false but Ꭱ is true

c.

Both Ꭺ and Ꭱ are false

d.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

Question number: 32

» Work, Energy and Power » Potential Energy

MCQ▾

Question

A tennis ball dropped from a height of 3 m rebounds only 1.6 meter after hitting the ground. What fraction of energy is lost in the impact?

Choices

Choice (4) Response

a.

0.466

b.

1.26

c.

2.45

d.

0.233

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