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Primary 3 Science Light Quiz

Free P3 Science Light quiz, HY3 Exam version, with questions, answers, and syllabus-aligned practice for Singapore students.

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Primary 3 Science From Real Exams Generated by Tencent HY3 Free Updated 2026-08-17

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Questions

Primary 3 Science Quiz - Light

Name: ______________________
Class: _________
Date: ___________
Score: _______ / 20

Duration: 40 minutes
Total Marks: 20

Instructions:

This quiz has 20 questions on the topic of Light.
Section A: 10 multiple-choice questions (1 mark each).
Section B: 5 short-answer questions (1 mark each).
Section C: 5 application questions (1 mark each).
Write your answers clearly in the spaces provided.

Section A: Multiple Choice (1 mark each)

Which of the following is a source of light?
A) A mirror
B) The Sun
C) A book
D) A wall
Light travels from a source in which way?
A) Only downwards
B) In a straight line
C) In a circle
D) Only upwards
Which material lets most light pass through so we can see clearly through it?
A) Wood
B) Clear glass
C) Thick cardboard
D) Metal
A boy stands in front of a plane mirror. Where does his image appear?
A) Behind him
B) On the ceiling
C) Behind the mirror
D) Inside the mirror surface
Which of these is NOT a source of light?
A) A candle flame
B) A glowing bulb
C) A red apple
D) A torch
We see a chair because light —
A) is made by the chair
B) bounces off the chair into our eyes
C) passes through the chair
D) is blocked by the chair
Which object will make the darkest shadow?
A) Clear plastic sheet
B) Thin paper
C) Opaque wooden block
D) Translucent cloth
At night, we can see the Moon because it —
A) makes its own light
B) reflects light from the Sun
C) is a star
D) glows from heat
A shadow is formed when light is —
A) bent
B) absorbed completely
C) blocked by an object
D) sped up
Which is the best reason to use curtains that do not let light through in a bedroom?
A) To keep the room bright
B) To block light for sleeping
C) To make the room hotter
D) To see outside clearly

Section B: Short Answer (1 mark each)

Name one natural source of light.
Name one man-made source of light.
What do we call an object that does not let light pass through?
Fill in the blank: Light travels in ________ lines.
We see the Sun during the day. What do we call the period when the Sun is hidden and it is dark?

Section C: Application (1 mark each)

Siti wants to read a book outdoors at night. She needs something to give light. Name one object she can use.
A teacher puts a clear glass cup and a ceramic mug on a table. Which one will let light pass through so you can see the table below it?
Ali shines a torch at a ball. A shadow of the ball appears on the wall. What must be between the torch and the wall?
Mother uses a mirror to help her see behind a shelf. The mirror shows light to her eyes. What does the mirror do to light?
A student wears sunglasses that let only some light through. Are the sunglasses clear glass or tinted plastic?

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Answers

Primary 3 Science Quiz - Light: Answer Key

Total Marks: 20
Topic: Light
Level: Primary 3

Section A: Multiple Choice (1 mark each)

B) The Sun
Teaching note: A source of light is something that gives out light by itself. The Sun is a natural source. A mirror, book, and wall do not make light; they only reflect or block it.
B) In a straight line
Teaching note: Light from a source travels outward in straight lines. This is why shadows have sharp edges when the light is blocked.
B) Clear glass
Teaching note: Clear glass is transparent; most light passes through so we can see through it. Wood, cardboard, and metal block light.
C) Behind the mirror
Teaching note: A plane mirror forms an image that appears to be behind the mirror at the same distance as the boy is in front.
C) A red apple
Teaching note: A red apple is not a light source; it is seen because it reflects light. Candle, bulb, and torch give out light.
B) bounces off the chair into our eyes
Teaching note: We see non-luminous objects when light reflects from them to our eyes.
C) Opaque wooden block
Teaching note: Opaque objects block all light, making the darkest shadow. Clear plastic and thin paper let some light through.
B) reflects light from the Sun
Teaching note: The Moon is not a star and does not make its own light; it reflects sunlight.
C) blocked by an object
Teaching note: A shadow forms when an opaque object blocks light.
B) To block light for sleeping
Teaching note: Curtains that do not let light through (opaque) keep the room dark for better sleep.

Section B: Short Answer (1 mark each)

Sun (or any natural source: e.g., firefly, stars)
Teaching note: Natural sources exist in nature without human making them.
Torch (or bulb, lamp, candle — any man-made)
Teaching note: Man-made sources are created by people.
Opaque
Teaching note: Opaque means no light passes through.
Straight
Teaching note: Light travels in straight lines, which is why beams look like arrows.
Night (or darkness/night-time)
Teaching note: When the Sun is not visible, it is night.

Section C: Application (1 mark each)

Torch (or lamp, candle, light bulb)
Teaching note: She needs a man-made light source at night.
Clear glass cup
Teaching note: Clear glass is transparent; ceramic is opaque.
The ball (or an object/opaque object)
Teaching note: The ball blocks the torch light to form the shadow.
Reflects light
Teaching note: A mirror reflects light into her eyes so she can see.
Tinted plastic
Teaching note: Sunglasses let only some light through, so they are not clear glass; tinted plastic is used.