# NEET (National Eligibility cum Medical Entrance Test) Physics: Questions 811 - 815 of 2142

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## Passage

A system consists of block A and B each of mass m connected by a light spring as shown in the figure with block B in contact with a wall. The block A compresses the spring by 3mg /k from natural length of spring and then released from rest. Neglect friction anywhere.

## Question number: 811 (3 of 3 Based on Passage) Show Passage

MCQ▾

### Question

Maximum extension in the spring after system loses contact with wall

### Choices

Choice (4) Response

a.

b.

c.

d.

None of the above

## Question number: 812

MCQ▾

### Question

The work done in pulling a body of mass 6 kg along an inclined plane (angle 45°) with coefficient of friction 0.2 through 2 m, will be -

### Choices

Choice (4) Response

a.

91.08 J

b.

90.08 J

c.

98.08 J

d.

99.72 J

## Question number: 813

MCQ▾

### Question

The contact force exerted by a body A on another body B is equal to the normal force between the bodies. We conclude that -

(1) The surfaces must be smooth

(2) Force of friction between two bodies may be equal to zero

(3) Magnitude of normal reaction is equal to that of friction

(4) Bodies may be rough

Which of the following options are correct?

### Choices

Choice (4) Response

a.

1 and 4

b.

2 and 4

c.

1 and 2

d.

3 and 4

## Question number: 814

MCQ▾

### Question

The potential energy between two atoms in a molecule is given by, where a and b are positive constant and x is the distance between the atoms. The atoms is an stable equilibrium, when-

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 815

MCQ▾

### Question

In above question, what is the tension in each string?

### Choices

Choice (4) Response

a.

b.

c.

d.

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