# Experimental Skills (NEET Physics): Questions 18 - 22 of 67

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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: 18 (2 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: 19

» Experimental Skills » Vernier Callipers

MCQ▾

### Question

A 2 kg body and a 3 kg body are moving along the x-axis. At a particular instant the 2 kg body has a velocity of 3 ms -1 and the 3 kg body has the velocity of 2ms -1. The velocity of the center of mass at that instant is

### Choices

Choice (4) Response

a.

0

b.

1 ms -1

c.

5 ms -1

d.

None of the above

## Question number: 20

» Experimental Skills » Vernier Callipers

MCQ▾

### Question

The center of mass of a triangle shown in figure has coordinates

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 21

» 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

## Question number: 22

» Experimental Skills » Screw Gauge

MCQ▾

### Question

In the HCl molecule, the separation between the nuclei of the two atom is about 1.27 Å (1Å = 10 -10 m). The approximate location of the center of mass from the hydrogen atom, assuming the chlorine atom to be about 35.5 times massive as hydrogen is

### Choices

Choice (4) Response

a.

l Å

b.

2.5 Å

c.

1.24 Å

d.

1.5 Å

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