NEET (2024 Updated)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1007 - 1010 of 5119

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Question 1007

Question MCQ▾

Electromagnetic waves travel in a medium with a speed of 2 × 108 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

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Question 1008

Question 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

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Question 1009

Question MCQ▾

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)

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Question 1010

Question MCQ▾

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

Choices

Choice (4)Response

a.

b.

2d

c.

3d

d.

d

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