# Experimental Skills-Screw Gauge (NEET Physics): Questions 13 - 17 of 29

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## Question number: 13

» Experimental Skills » Screw Gauge

MCQ▾

### Question

Three identical metal balls each of radius r are placed touching each other on a horizontal surface such that an equilateral triangle is formed, when centers of three balls are joined. The center of the mass of system is located at

### Choices

Choice (4) Response

a.

Line joining centers of any two balls

b.

Centre of one of the balls

c.

Horizontal surface

d.

Point of intersection of the medians

## Question number: 14

» Experimental Skills » Screw Gauge

MCQ▾

### Question

Four particles of masses m, 2m, 3m and 4m are arranged at the corners of a parallelogram with each side equal to a and one of the angle between two adjacent sides is 60°. The parallelogram lies in the x-y plane with mass-m at the origin and 4m on the x-axis. The center of mass of the arrangement will be located at

### Choices

Choice (4) Response

a.

b.

c.

d.

## 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: 15 (1 of 3 Based on Passage) Show Passage

» Experimental Skills » Screw Gauge

MCQ▾

### Question

Acceleration of center of mass of system comprising A and B just after A is released is

### Choices

Choice (4) Response

a.

3g

b.

0

c.

3g/2

d.

All of the above

## Question number: 16 (2 of 3 Based on Passage) Show Passage

» Experimental Skills » Screw Gauge

MCQ▾

### Question

Velocity of center of mass of system comprising A ands when block B just loses contact with the wall

### Choices

Choice (4) Response

a.

b.

c.

d.

Question does not provide sufficient data or is vague

## Question number: 17

» Experimental Skills » Screw Gauge

Assertion-Reason▾

### Assertion (Ꭺ)

The center of mass of a system of n particles is the weighted average of the position vector of the n particles making up the system.

### Reason (Ꭱ)

The position of the center of mass of a system is independent of coordinate system.

### Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

c.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

d.

Both Ꭺ and Ꭱ are false

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