NEET Physics: Questions 891 - 895 of 2098

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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.

xμmgk

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

» Laws of Motion » Laws of Friction

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

» Laws of Motion » Static and Kinetic Friction

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

» Work, Energy and Power » Potential Energy

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.

mv2

b.

12mv2

c.

32mv2

d.

2mv2

Passage

Read the passage given below and answer the questions that follows:

Finding elongation of the spring

Finding Elongation of the Spring

A bead of mass m is attached to one end of a spring of natural length R

A bead of mass m is attached to one end of a spring of natural length R and spring constant K=(3+1)mgR 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

» Laws of Motion » Force and Inertia

MCQ▾

Question

Initial elongation in the spring is -

Choices

Choice (4) Response

a.

2R

b.

R

c.

2R

d.

3R

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

» Laws of Motion » Force and Inertia

MCQ▾

Question

Tangential acceleration of bead just after it is released.

Choices

Choice (4) Response

a.

3g4

b.

g2

c.

2g3

d.

g4

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