NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1019 - 1022 of 2184

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Question number: 1019

» Electromagnetic Waves » Electromagnetic Waves & Characteristics

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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

» Ray Optics » Resolving Power of Microscopes and Astronomical Telescopes

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Assertion-Reason▾

Question

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

» Ray Optics » Magnification

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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

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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

A point source of light and mirror

A Point Source of Light and Mirror

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.

Choices

Choice (4) Response

a.

b.

2d

c.

3d

d.

d