# NEET Physics: Questions 891 - 895 of 2142

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## Passage

Read the passage given below and answer the questions that follows: A block of mass 1 kg is placed on a rough horizontal surface. A spring is attached to the block whose other end is joined to a rigid wall, as shown in the figure. A horizontal force is applied on the block so that it remains at rest while the spring is elongated by x.

Let F max and F min be the maximum and minimum values of force F for which the block remains a equilibrium. For a particular x,

F max - F min = 2N

Also shown is the variation of F max + F min versus x, the elongation of the spring.

## Question number: 891 (3 of 3 Based on Passage) Show Passage

MCQ▾

### Question

The spring constant of the spring is -

### Choices

Choice (4) Response

a.

50 N/m

b.

2.5 N/m

c.

20 N/m

d.

25 N/m

## Question number: 892

MCQ▾

### Question

A block is placed on a rough floor and a horizontal force F is applied on it. The force of friction f by the floor on the block is measured for different values of F and a graph is plotted between them –

(1) The graph is a straight line of slope 45°

(2) The graph is straight line parallel to the F axis

(3) The graph is a straight line of slope 45° for small F and a straight line parallel to the F-axis for large F.

(4) There is small kink on the graph

Which of the following options are correct?

### Choices

Choice (4) Response

a.

1 and 4

b.

1 and 2

c.

3 and 4

d.

1 and 3

## Question number: 893

MCQ▾

### Question

A particle of mass 4 m which is at rest explodes into three fragments two of the fragments each of mass m are found to move each with a speed v making an angle 90° with each other. The total energy released in this explosion is –

### Choices

Choice (4) Response

a.

b.

c.

d.

## Passage

A bead of mass m is attached to one end of a spring of natural length R and spring constant The other end of the spring is fixed at point A on a smooth ring of radius R as shown in figure. When bead is released to move then

## Question number: 894 (1 of 3 Based on Passage) Show Passage

MCQ▾

### Question

The normal reaction force at B is -

### Choices

Choice (4) Response

a.

3 mg/2

b.

3 mg

c.

mg

d.

mg/2

## Question number: 895 (2 of 3 Based on Passage) Show Passage

MCQ▾

### Question

Tangential acceleration of bead just after it is released.

### Choices

Choice (4) Response

a.

b.

c.

d.

f Page