NEET Physics: Questions 820 - 823 of 2098

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Question number: 820

» Work, Energy and Power » Work Done

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.

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: 821

» Laws of Motion » Laws of Friction

MCQ▾

Question

A body of mass 400 g slides on a rough horizontal surface. If the frictional force is 3.0 N, the angle made by the contact force on the body with the vertical will be

Choices

Choice (4) Response

a.

27°

b.

37°

c.

63°

d.

53°

Question number: 822

» Work, Energy and Power » Potential Energy

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.

GMR

b.

GMmR

c.

GM2R

d.

GMm2R

Question number: 823

» Work, Energy and Power » Power

Assertion-Reason▾

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

In this figure we show that uniform sphere under the force F.

Reason (Ꭱ)

Power developed by gravity force is nonzero.

Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

Both Ꭺ and Ꭱ are false

c.

Ꭺ is false but Ꭱ is true

d.

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

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