# Experimental Skills-Screw Gauge (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 9 - 12 of 29

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## Question number: 9

» Experimental Skills » Screw Gauge

Assertion-Reason▾

### Assertion (Ꭺ)

The center of mass of a proton and an electron, released from their respective positions remains at rest.

### Reason (Ꭱ)

The center of mass remains at rest, if no external force is applied.

### Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are 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.

Ꭺ is true but Ꭱ is false

## Question number: 10

» Experimental Skills » Screw Gauge

MCQ▾

### Question

The velocities of three particles of masses 20g, 30g and 50g are 10i, 10j and 10k respectively. The velocity of the center of mass of the three particles is

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 11

» Experimental Skills » Screw Gauge

MCQ▾

### Question

The two particles X and Y, initially at rest, start moving towards each other under mutual attraction. If at any instant the velocity of X is V and that of Y is 2V, the velocity of their center of mass will be 3

### Choices

Choice (4) Response

a.

0

b.

V

c.

V/2

d.

2V

## Question number: 12

» Experimental Skills » Screw Gauge

MCQ▾

### Question

A T shaped object, dimensions shown in the figure, a1 lying on a smooth floor. A force ‘F is applied at the poi: P parallel to AB, such that the object has only the translational motion without rotation. Find the location of P with respect to C

### Choices

Choice (4) Response

a.

b.

c.

I

d.

f Page