Work, Energy and Power (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 52 - 56 of 63

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Question number: 52

» Work, Energy and Power » Work Done

MCQ▾

Question

A chain of linear density 5 kg/m and length 8 m is lying on the table with 4 m of chain hanging from the edge. The work done in lifting the chain on the table will be –

Choices

Choice (4) Response

a.

98 J

b.

196 J

c.

392 J

d.

235.2 J

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Question number: 53

» Work, Energy and Power » Work Done

Assertion-Reason▾

Assertion (Ꭺ)

Sum of work done by the Newton’s 3 rd law pair internal forces, acting between two panicles may be zero.

Reason (Ꭱ)

If two particles undergo same displacement then work done by Newton’s 3 rd law pair forces on them is of opposite sign and equal magnitude.

Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

b.

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

c.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

d.

Ꭺ is true but Ꭱ is false

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Question number: 54

» Work, Energy and Power » Potential Energy

MCQ▾

Question

A tennis ball dropped from a height of 7 m rebounds only 1.6 f meter after hitting the ground. What fraction of energy is lost in the impact?

Choices

Choice (4) Response

a.

2.45

b.

0.466

c.

1.26

d.

0.771

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Question number: 55

» 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, 0, 4m) will be

Choices

Choice (4) Response

a.

10 J

b.

12 J

c.

6 J

d.

8 J

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Question number: 56

» Work, Energy and Power » Kinetic Energy

MCQ▾

Question

A ball moving with a speed of 9 m/s strikes with an identical stationary ball such that after the collision the direction of each ball makes an angle of 30° with the original line of motion. Find the speeds of the two balls after the collision. Is the kinetic energy conserved in this collision process?

Choices

Choice (4) Response

a.

6 √3 m/s, yes

b.

0, yes

c.

6 √3 m/s, no

d.

3 √3 m/s, no

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