NEET (National Eligibility cum Medical Entrance Test) Physics: Questions 958 - 961 of 2142

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Question number: 958

» Laws of Motion » Laws of Friction

MCQ▾

Question

Choose the correct statements -

(1) Force of friction is partially independent of microscopic area of surface in contact and relative velocity between them, (if it is not high)

(2) Normally with increase in smoothness friction decreases. But if the surface area are made too smooth by polishing and cleaning the bonding force of adhesion will increase and so the friction will increase resulting in ‘Cold welding’

(3) Friction is a non-conservative force, i. e. work done against friction is path dpendent.

(4) Force of friction depends on area

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

Choices

Choice (4) Response

a.

2 and 4 are correct

b.

1, 2 and 3 are correct

c.

1 and 2 are correct

d.

1 and 3 are correct

Question number: 959

» Kinematics » Uniformly Accelerated Motion

MCQ▾

Question

An automobile of mass m accelerates from rest. If the engine supplies a constant power P, the position (s) at time (t) is given by –

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 960

» 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 magnitude of the contact force is (g = 10 m/s 2)

Choices

Choice (4) Response

a.

5.0 N

b.

3.0 N

c.

4.0 N

d.

7.0 N

Question number: 961

» Work, Energy and Power » Potential Energy

MCQ▾

Question

A tennis ball dropped from a height of 6 m rebounds only 2.1 f meter after hitting the ground. What fraction of energy is lost in the impact?

Choices

Choice (4) Response

a.

0.65

b.

0.5

c.

0.466

d.

1.26

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