Work, Energy and Power [NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics]: Questions 7 - 11 of 63

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Question number: 7

» Work, Energy and Power » Work Done

Edit
MCQ▾

Question

The work done in pulling a body of mass 5 kg along an inclined plane (angle 60°) with coefficient of friction 0.2 through 2 m, will be -

Choices

Choice (4)Response

a.

94.08 J

b.

98.08 J

c.

91.08 J

d.

90.08 J

Question number: 8

» Work, Energy and Power » Work Done

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MCQ▾

Question

The work done in lifting water from a well of depth 6 m using a bucket of mass 0.4 kg and volume 2 liter, will be

Choices

Choice (4)Response

a.

98 J

b.

141.12 J

c.

73.5 J

d.

147 J

Question number: 9

» Work, Energy and Power » Work Done

Edit
MCQ▾

Question

A man pushes a wall and fails to displace it. Choose incorrect statements related to his work

(1) Negative work

(2) Positive but not maximum work

(3) Maximum work

(4) No work at all

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

Choices

Choice (4)Response

a.

1,2 and 3 are correct

b.

2 and 4 are correct

c.

1 and 3 are correct

d.

1 and 2 are correct

Question number: 10

» Work, Energy and Power » Potential Energy

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MCQ▾

Question

If g is the acceleration due to gravity on the earth’s surface, the gain in the potential energy of an object of mass m raised from surface of the earth to a height equal to radius R of the earth is - [M = mass of earth]

Choices

Choice (4)Response

a.

b.

c.

d.

Question number: 11

» Work, Energy and Power » Power

Edit
Assertion-Reason▾

Question

Assertion (Ꭺ)

As shown in the figure, a uniform sphere is rolling on a horizontal surface without slipping, under the action of a horizontal force F.

Power developed due to friction force is zero.

Sphere with power developed due to friction is explained

Sphere with Power Developed Due to Friction is Explained

Reason (Ꭱ)

Power developed by gravity force is nonzero.

Choices

Choice (4)Response

a.

Ꭺ is false but Ꭱ is true

b.

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

c.

Both Ꭺ and Ꭱ are false

d.

Ꭺ is true but Ꭱ is false

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