Light Quiz - CBSE Class 8 Science

Free practice quiz: Light (CBSE Class 8 Science). 15 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This CBSE Class 8 Science practice quiz has 15 multiple-choice questions on Light, and 15 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. Which of these is NOT a source of light?

   1. The Sun
   2. A light bulb
   3. A mirror
   4. A firefly
   Show answer

   Answer: C. A mirror

   Mirrors reflect light, they do not produce light themselves. The Sun, a light bulb, and a firefly all produce their own light.

2. What happens to light when it passes from air to water?

   1. It speeds up
   2. It slows down
   3. Its speed remains the same
   4. It disappears
   Show answer

   Answer: B. It slows down

   Light travels slower in denser mediums like water compared to air due to refraction.

3. What is the difference between a convex and a concave lens?

   1. A convex lens is thicker at the edges and thinner in the middle; a concave lens is thicker in the middle and thinner at the edges
   2. A convex lens is thicker in the middle and thinner at the edges; a concave lens is thicker at the edges and thinner in the middle
   3. Both lenses are thicker in the middle
   4. Both lenses are thinner in the middle
   Show answer

   Answer: B. A convex lens is thicker in the middle and thinner at the edges; a concave lens is thicker at the edges and thinner in the middle

   Convex lenses are thicker in the middle, converging light, while concave lenses are thicker at the edges, diverging light.

4. What is the function of the lens in the human eye?

   1. To protect the eye
   2. To detect light
   3. To focus light onto the retina
   4. To control the amount of light
   Show answer

   Answer: C. To focus light onto the retina

   The lens in the eye focuses light rays onto the retina to form a clear image.

5. Explain the working principle of a simple camera.

   1. Uses a concave lens to form a real and inverted image on the film
   2. Uses a convex lens to form a real and inverted image on the film
   3. Uses a plane mirror to form a virtual image on the film
   4. Uses a prism to separate colors on the film
   Show answer

   Answer: B. Uses a convex lens to form a real and inverted image on the film

   A simple camera uses a convex lens to converge light rays and form a real and inverted image on the film or sensor.

More questions in this quiz

Answers and explanations are in the full quiz.

1. What is the speed of light in a vacuum?
2. What phenomenon explains why we can see objects?
3. What is the phenomenon of the separation of white light into its constituent colours called?
4. Explain the concept of total internal reflection and its applications.
5. How does a convex lens form a real and inverted image?
6. What is the role of the iris in the human eye?
7. What is myopia, and how is it corrected?
8. What is hypermetropia, and how can it be corrected?
9. How does the human eye adjust its focus for objects at different distances?
10. Explain the phenomenon of diffraction of light and its significance in wave theory.

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