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Olympiad Test: Light - Class 8 MCQ


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20 Questions MCQ Test Science Class 8 - Olympiad Test: Light

Olympiad Test: Light for Class 8 2024 is part of Science Class 8 preparation. The Olympiad Test: Light questions and answers have been prepared according to the Class 8 exam syllabus.The Olympiad Test: Light MCQs are made for Class 8 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Olympiad Test: Light below.
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Olympiad Test: Light - Question 1

X is a surface that cannot produce clear images. What is X?

Detailed Solution for Olympiad Test: Light - Question 1

When light is incident on a rough surface, irregular reflection takes place, hence the image formed is not clear.

Olympiad Test: Light - Question 2

With what is glass coated in order to convert it into a mirror?

Detailed Solution for Olympiad Test: Light - Question 2

Glasses are coated with silver to be used as mirrors to increase their reflection property.

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Olympiad Test: Light - Question 3

What makes objects visible?

Detailed Solution for Olympiad Test: Light - Question 3

An object is visible only when reflected light from the object reaches the retina of our eyes.

Olympiad Test: Light - Question 4

What is the phenomenon of light bouncing back into the same medium called?

Detailed Solution for Olympiad Test: Light - Question 4

The phenomenon of light in which, light is reflected or bounced back into the same medium is called reflection.

Olympiad Test: Light - Question 5

What is the perpendicular drawn at any point on a mirror called?

Detailed Solution for Olympiad Test: Light - Question 5

The perpendicular drawn to the reflecting surface of a mirror at the point of incidence is called 'normal'. The point on the reflecting surface where the light ray is incident is called the point of incidence.

Olympiad Test: Light - Question 6

How many images are obtained when plane mirrors are arranged parallel to each other?

Detailed Solution for Olympiad Test: Light - Question 6

When two mirrors are kept parallel to each other, an infinite number of images can be seen.

Olympiad Test: Light - Question 7

If the angle of incidence is 80o, what will be the angle of reflection?

Detailed Solution for Olympiad Test: Light - Question 7

The angle of incidence = the angle of reflection. So, the angle of reflection is 80o.

Olympiad Test: Light - Question 8

Which of the following is used by E.N.T. doctors?

Detailed Solution for Olympiad Test: Light - Question 8

A concave mirror is used by E.N.T. doctors to get a magnified image of internal organs like ear, nose and throat.

Olympiad Test: Light - Question 9

A When the angle between two plane mirrors is 60, how many images will be formed by the mirrors?

Detailed Solution for Olympiad Test: Light - Question 9

If two plane mirrors are inclined at an angle of  images are formed.

Olympiad Test: Light - Question 10

If the angle of incidence is 50o, then calculate the angle between the incident ray and the reflected ray.

Detailed Solution for Olympiad Test: Light - Question 10

In reflection of light, ∠i = 50oand ∠i = ∠r = the angle between incident ray and reflected ray = 50° + 50° = 100°

Olympiad Test: Light - Question 11

In our houses, which of the following is used for looking at ourselves?

Detailed Solution for Olympiad Test: Light - Question 11

We use plane mirrors to see ourselves, because the image formed by a plane mirror is virtual, erect and of the same size.

Olympiad Test: Light - Question 12

Which of the following statements is true?

Detailed Solution for Olympiad Test: Light - Question 12

When a light ray is reflected from the reflecting surface, the incident ray, the reflected ray and the normal lie in the same plane. The angle of incidence = The angle of reflection.

Olympiad Test: Light - Question 13

What happens in lateral inversion?

Detailed Solution for Olympiad Test: Light - Question 13

The image formed by the plane mirror is laterally inverted i.e., the right side of the object appears on the left side of the image and left side of the object appears on the right side of the image.

Olympiad Test: Light - Question 14

In a periscope, how are the reflecting mirrors arranged?

Detailed Solution for Olympiad Test: Light - Question 14

Correct Answer :-B

Explanation:- A periscope is an optical instrument used to view object which is not in direct sight of human eye. It works by using the Laws of Reflection and are widely used in submarines to navigate under water. 

It works by using two mirrors placed at angle of 45 degree with each other. When light falls on one mirror, it bounces to the other mirror and then reaches the human eye.

A simple periscope only uses mirrors but complex periscope uses prisms instead of mirror. These periscopes are used in the field of medicine particularly in cystoscopy and endoscopy.

Olympiad Test: Light - Question 15

What is the nature of image formed on the retina of human eye of an object?

Detailed Solution for Olympiad Test: Light - Question 15

The human eye serves as a convex lens. It forms real, inverted and diminished image of an object.

Olympiad Test: Light - Question 16

Identify the value of persistence of vision.

Detailed Solution for Olympiad Test: Light - Question 16

Persistence of vision is a phenomenon where the brain continues to sense the image even after the object has been removed. This lasts for 1/16th of a second.

Olympiad Test: Light - Question 17

The characteristics of an eye disease are given below.
(i) Eye sight becomes foggy
(ii) Eye lens becomes cloudy
(iii) There is a loss of vision

In which of the following are the above characteristics observed?

Detailed Solution for Olympiad Test: Light - Question 17

Cataract occurs in old age due to the given characteristics and can be cured by introducing a new artificial lens.

Olympiad Test: Light - Question 18

Which of the following is the requirement of nocturnal animals like owl an bat?

Detailed Solution for Olympiad Test: Light - Question 18

The nocturnal animals need more light to see at night. The large cornea and pupil allow more light to enter into their eyes. They also have retina with large number of rods.

Olympiad Test: Light - Question 19

Look at the given figure. 

Find the angle between the incident ray and the reflected ray.

Detailed Solution for Olympiad Test: Light - Question 19

∠i = 40o(given) ∠i = ∠r = 40o
The angle between the incident ray and the reflected ray =∠i +∠r = 40o+40o = 80o

Olympiad Test: Light - Question 20

The diagram shows the path of a light ray X, directed at a plane mirror.

Which of the following is the correct reflected ray?

Detailed Solution for Olympiad Test: Light - Question 20

We know that for a reflected ray, the angle that the incident ray makes with the line perpendicular to the surface is equal to the angle made by the reflected ray with this perpendicular line. N is the correct reflected ray of X.

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