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.

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
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   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.

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