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Olympiad Test: Light - 1


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20 Questions MCQ Test Science Olympiad Class 7 | Olympiad Test: Light - 1

Olympiad Test: Light - 1 for Class 7 2022 is part of Science Olympiad Class 7 preparation. The Olympiad Test: Light - 1 questions and answers have been prepared according to the Class 7 exam syllabus.The Olympiad Test: Light - 1 MCQs are made for Class 7 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Olympiad Test: Light - 1 below.
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Olympiad Test: Light - 1 - Question 1

A substance which transmits most of the light rays incident on it is called

Olympiad Test: Light - 1 - Question 2

The distance between the sun and the earth is

Olympiad Test: Light - 1 - Question 3

Which of the following is a natural source of light

Olympiad Test: Light - 1 - Question 4

Light is

Olympiad Test: Light - 1 - Question 5

The earth light can be seen from

Detailed Solution for Olympiad Test: Light - 1 - Question 5

Earth is a non-luminous body and does not emit any light. 

Olympiad Test: Light - 1 - Question 6

The speed of light is

Olympiad Test: Light - 1 - Question 7

The speed of light is

Detailed Solution for Olympiad Test: Light - 1 - Question 7

The speed of light decreases with an increase in the density of the medium. 

Olympiad Test: Light - 1 - Question 8

Image formed by plane mirror is always

Olympiad Test: Light - 1 - Question 9

An image obtained on screen is

Olympiad Test: Light - 1 - Question 10

Which of the following letters will be seen without any change in a plane mirror?

Detailed Solution for Olympiad Test: Light - 1 - Question 10

T is a laterally symmetrical object and hence its image in a plane mirror would be the same as itself.

Olympiad Test: Light - 1 - Question 11

A source of light is

Olympiad Test: Light - 1 - Question 12

As the distance of source increases

Detailed Solution for Olympiad Test: Light - 1 - Question 12

The energy of the light keeps on getting absorbed and transformed as it moves through a medium. Therefore, its intensity decreases.

Olympiad Test: Light - 1 - Question 13

Which of the following statement is true?

Olympiad Test: Light - 1 - Question 14

A spherical mirror with its reflecting surface on the outside is a

Olympiad Test: Light - 1 - Question 15

Which of the following is luminous?

Detailed Solution for Olympiad Test: Light - 1 - Question 15

Objects that can emit light energy by themselves are known as luminous objects.

These objects can cause a sensation of light.

The luminous objects are visible as they emit light on their own.

Olympiad Test: Light - 1 - Question 16

Which of the following is transparent?

Olympiad Test: Light - 1 - Question 17

Which of the following is opaque?

Olympiad Test: Light - 1 - Question 18

Shadows are formed because

Olympiad Test: Light - 1 - Question 19

A magnifying glass is nothing but

Detailed Solution for Olympiad Test: Light - 1 - Question 19

A magnifying glass is a convex lens that is used to produce a magnified image of an object. The lens is usually mounted in a frame with a handle. A sheet magnifier consists of many very narrow concentric ring-shaped lenses, such that the combination acts as a single lens but is much thinner.

Olympiad Test: Light - 1 - Question 20

Following conditions are true for virtual image

Detailed Solution for Olympiad Test: Light - 1 - Question 20

a) The virtual image is always erect. The common example of virtual image is the image formed in the mirror when we stand in front of that mirror. 

b) In reality, these rays come from the points on the mirror where they are reflected. The image behind the mirror is called a virtual image because it cannot be projected onto a screen—the rays only appear to originate from a common point behind the mirror.

c) Virtual images cannot be obtained on the screen because the image formed is from the light rays that do not meet but appear to meet when they are produced backwards. 

 

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