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Important Questions Test: Light - Class 8 MCQ


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15 Questions MCQ Test Science Class 8 - Important Questions Test: Light

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

The image that can be obtained on the screen is called _____________.

Detailed Solution for Important Questions Test: Light - Question 1

An image which can be obtained on a screen is called a real image.

Images are of two types: real images and virtual images. Real images are formed on a screen, whereas virtual images cannot be formed on the screen.

Important Questions Test: Light - Question 2

What is the main cause of diffused reflection?

Detailed Solution for Important Questions Test: Light - Question 2
Diffused reflection is caused by rough surfaces which scatter light in various directions.
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Important Questions Test: Light - Question 3

What happens when light rays pass from air into water?

Detailed Solution for Important Questions Test: Light - Question 3

When light rays pass from air into water, they slow down due to the change in the medium's optical density. This change in speed causes the light rays to bend towards the normal (the line perpendicular to the surface of the water) as they enter the denser medium, in a process known as refraction.

Important Questions Test: Light - Question 4
What is the blind spot in the human eye?
Detailed Solution for Important Questions Test: Light - Question 4
The blind spot in the human eye is the area on the retina where there are no rods and cones, hence no image detection occurs there.
Important Questions Test: Light - Question 5
What tool can visually impaired individuals use to read and write?
Detailed Solution for Important Questions Test: Light - Question 5
The Braille system is a tool that visually impaired individuals use to read and write. It consists of patterns of raised dots that can be felt with the fingers.
Important Questions Test: Light - Question 6
What is the phenomenon where light rays are reflected multiple times between mirrors called?
Detailed Solution for Important Questions Test: Light - Question 6
Multiple reflections occur when light rays are reflected several times between mirrors, as seen in a kaleidoscope.
Important Questions Test: Light - Question 7
What happens to light when it strikes a shiny surface like a mirror?
Detailed Solution for Important Questions Test: Light - Question 7
When light strikes a shiny surface like a mirror, it gets reflected. The direction of this reflection follows the law of reflection, where the angle of incidence is equal to the angle of reflection.
Important Questions Test: Light - Question 8
Which part of the eye focuses light onto the retina?
Detailed Solution for Important Questions Test: Light - Question 8
The lens of the eye focuses light onto the retina, allowing us to see a clear image.
Important Questions Test: Light - Question 9

Kaleidoscope is based on the principle of spectrum.

Detailed Solution for Important Questions Test: Light - Question 9

B is the correct option. It si false,actually the Kaleidoscope is based on the principle of multiple reflection. according to this the light ray get reflected by these multiple mirror. when a light ray falls on one mirror , then it get reflected to the another one.

Important Questions Test: Light - Question 10
What is the function of the pupil in the human eye?
Detailed Solution for Important Questions Test: Light - Question 10
The pupil controls the amount of light entering the eye by expanding or contracting.
Important Questions Test: Light - Question 11
Which part of the eye controls the amount of light entering the eye?
Detailed Solution for Important Questions Test: Light - Question 11
The iris is the part of the eye that controls the amount of light entering the eye by adjusting the size of the pupil.
Important Questions Test: Light - Question 12
What is the angle between the normal and the reflected ray called?
Detailed Solution for Important Questions Test: Light - Question 12
The angle between the normal and the reflected ray is called the angle of reflection. This is one of the fundamental principles of the laws of reflection.
Important Questions Test: Light - Question 13
What phenomenon causes a rainbow to form in the sky?
Detailed Solution for Important Questions Test: Light - Question 13
A rainbow is formed due to the dispersion of light, which occurs when light is split into its constituent colors. This happens when sunlight passes through water droplets in the atmosphere.
Important Questions Test: Light - Question 14

Cones and rods are the light sensitive cells.

Detailed Solution for Important Questions Test: Light - Question 14

Photoreceptors in the retina are classified into two groups, named after their physical morphologies. Rod cells are highly sensitive to light and function in nightvision, whereas cone cells are capable of detecting a wide spectrum of light photons and are responsible for colour vision.

Important Questions Test: Light - Question 15

The image formed by plane mirror is

Detailed Solution for Important Questions Test: Light - Question 15

Plane mirrors are the only type of mirror for which a real object always produces an image that is virtual, errect and of the same size as the object.

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