# NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1019 - 1022 of 2320

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## Question number: 1019

Edit
MCQ▾

### Question

Electromagnetic waves travel in a medium with a speed of 2 x 10 8 m/s. The relative permeability of the medium is 1. What is the relative permittivity of the medium?

### Choices

Choice (4)Response

a.

2.25

b.

3.25

c.

1.25

d.

-0.25

## Question number: 1020

Edit
Assertion-Reason▾

### Assertion (Ꭺ)

By increasing the diameter of the objective of telescope, we can increase its range.

### Reason (Ꭱ)

The range of a telescope tells us how far away a star of some standard brightness can be spotted by telescope.

### Choices

Choice (4)Response

a.

Ꭺ is false but Ꭱ is true

b.

Ꭺ is true but Ꭱ is false

c.

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

d.

Both Ꭺ and Ꭱ are false

## Question number: 1021

Edit
MCQ▾

### Question

The focal length of a concave mirror is 30 cm. Find the position of the object in front of the mirror, so that the image is three times the size of the object.

### Choices

Choice (4)Response

a.

20 cm or 40 cm

b.

40 cm (only)

c.

30 cm (only)

d.

20 cm (only)

## Question number: 1022

» Ray Optics » Reflection and Refraction of Light » Spherical Surface

Edit
MCQ▾

### Question

A point source of light B is placed at a distance L in front of the center of a mirror of width ‘d’ hung vertically on a wall. A man walks in front of the mirror along a line parallel to the mirror at a distance 2L from it as shown in fig. The greatest distance over which he can see the image of the light source in the mirror is

### Choices

Choice (4)Response

a.

b.

2d

c.

3d

d.

d

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