Light test worksheet - Free Printable

Let's go through each question on the Science Assessment Year 3: Light worksheet and provide correct answers with explanations.

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1. Select all the things that are light sources

Light sources are objects that produce their own light.

- a window → ✘ Not a light source (it lets in light from outside, but doesn't produce light itself).
- a mirror → ✘ Not a light source (reflects light but doesn’t produce it).
- the Moon → ✘ Not a light source (it reflects sunlight; it does not produce its own light).
- a candle → ✔ Yes (when lit, it produces light through combustion).
- the Sun → ✔ Yes (it produces its own light through nuclear fusion).
- a torch → ✔ Yes (produces light using batteries and a bulb).

✔ Correct answers:
- a candle
- the Sun
- a torch

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2. What is dark?

Answer:
Dark is the absence of light. When there is no light, we cannot see things clearly, and it appears dark.

Explanation:
Darkness occurs when light is blocked or not present. It’s not a physical thing—it's simply the lack of visible light reaching our eyes.

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3. Fill in the blank space in this sentence:

> Light travels in a ____________ line from a light source to an object.

Answer:
straight

Explanation:
Light travels in straight lines (called rays) until it hits something. This is why shadows form—light can't bend around objects easily.

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4. What happens to the pupil in your eye if a room gets darker?

Answer:
The pupil gets bigger (dilates).

Explanation:
The pupil is the black circle in the center of your eye. In dim light, the muscles in the iris (the colored part of the eye) relax, making the pupil larger so more light can enter the eye. This helps you see better in the dark.

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5. What happens if you shine a torch on a shiny surface?

Answer:
The light reflects off the shiny surface.

Explanation:
Shiny surfaces (like mirrors or polished metal) reflect light well. When a torch shines on such a surface, the light bounces off it in a specific direction. This is called reflection. You might see a bright spot or even see your reflection.

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✔ Final Answers Summary:

1. Light sources: a candle, the Sun, a torch
2. What is dark? Dark is the absence of light.
3. Fill in the blank: Light travels in a straight line...
4. Pupil in darkness: The pupil gets bigger (dilates) to let in more light.
5. Torch on shiny surface: The light reflects off the surface.

Let me know if you'd like this formatted for printing or as a student answer sheet!