# NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 959 - 962 of 2184

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## Question number: 959

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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.

1,2 and 3 are correct

b.

1 and 2 are correct

c.

1 and 3 are correct

d.

2 and 4 are correct

## Question number: 960

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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.

b.

c.

d.

## Question number: 961

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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.

3.0 N

b.

7.0 N

c.

4.0 N

d.

5.0 N

## Question number: 962

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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.

0.466

b.

1.26

c.

0.65

d.

0.5