# NEET (National Eligibility cum Medical Entrance Test) Physics: Questions 378 - 381 of 2142

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## Question number: 378

MCQ▾

### Question

Two rigid bodies A and B rotate with rotational kinetic energies E A and E B respectively. The moments of inertia of A and B about the axis of rotation are I A and I B respectively. If I A = I B /8 and E A = 50 E B, the ratio of angular momentum (L A) of A to the angular momentum (L B) of B is

### Choices

Choice (4) Response

a.

0. . 25

b.

2.5

c.

1.25

d.

5

## Question number: 379

MCQ▾

### Question

If identical charges (-q) are placed at each corner of a cube of side b , then electric potential energy of charge (+q) which is placed at center of the cube will be

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 380

MCQ▾

### Question

What is the function of a screw gauge in the experiment of determining Young’s modulus of a wire?

### Choices

Choice (4) Response

a.

It measures the length of the wire.

b.

It measures the diameter of the wire.

c.

It measures the extension in the wire.

d.

## Question number: 381

MCQ▾

### Question

Figure given below shows two identical parallel plate capacitors connected to a battery with switch S closed. The switch is now opened and the free space between the plates of capacitors is filled with a dielectric of dielectric constant 3. What will be the ratio of total electrostatic energy stored in both capacitors before and after the introduction of the dielectric?

### Choices

Choice (4) Response

a.

5: 1

b.

3: 1

c.

3: 5

d.

5: 3

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