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Primary 5 Science Light Quiz
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Questions
Primary 5 Science Quiz - Light
Name: ________________________
Class: ________________________
Date: ________________________
Score: ________ / 40
Duration: 40 minutes
Total Marks: 40
Instructions
- Answer all questions.
- Write your answers in the spaces provided.
- Marks are shown in brackets [ ] at the end of each question.
- You may use a ruler for diagrams.
- The total time allowed is 40 minutes. Manage your time wisely.
Section A: Multiple Choice (Questions 1–10)
Each question carries 1 mark. Choose the most correct answer.
1. Light travels in a __________ line.
- (A) curved
- (B) zigzag
- (C) straight
- (D) circular
Answer: ___________
2. Which of the following is a natural source of light?
- (A) A torch
- (B) The Moon
- (C) The Sun
- (D) A light bulb
Answer: ___________
3. When light hits a smooth, shiny surface, it is __________.
- (A) absorbed
- (B) reflected
- (C) transmitted
- (D) refracted
Answer: ___________
4. A shadow is formed because light __________.
- (A) passes through all objects
- (B) travels in a straight line and cannot pass through opaque objects
- (C) bends around objects
- (D) is absorbed by transparent objects
Answer: ___________
5. Which material allows most light to pass through?
- (A) Wood
- (B) Metal
- (C) Clear glass
- (D) Cardboard
Answer: ___________
6. The image formed in a pinhole camera is __________.
- (A) upright and magnified
- (B) inverted and real
- (C) upright and virtual
- (D) inverted and virtual
Answer: ___________
7. Which of the following is an opaque material?
- (A) Clear plastic
- (B) Frosted glass
- (C) A book
- (D) Water
Answer: ___________
8. When white light passes through a prism, it is separated into different colours. This is called __________.
- (A) reflection
- (B) refraction
- (C) dispersion
- (D) absorption
Answer: ___________
9. The colour of an opaque object depends on the colour of light that it __________.
- (A) absorbs
- (B) reflects
- (C) transmits
- (D) refracts
Answer: ___________
10. A rainbow is formed when sunlight is __________ by water droplets in the air.
- (A) absorbed
- (B) reflected only
- (C) refracted and reflected
- (D) transmitted
Answer: ___________
Section B: Short Answer (Questions 11–16)
Answer each question in the space provided.
11. State two properties of light.
[2 marks]
12. Complete the following table to classify the materials.
[3 marks]
| Material | Transparent / Translucent / Opaque |
|---|---|
| Clear plastic sheet | |
| Tissue paper | |
| Brick wall |
13. The diagram below shows a ray of light hitting a mirror.
normal
|
----->| /
ray | /
\|/
-------- mirror
(a) Label the "incident ray" and "reflected ray" on the diagram above.
[1 mark]
(b) What is the relationship between the angle of incidence and the angle of reflection?
[1 mark]
14. Explain why the shadow of an object is longest in the early morning and late afternoon, but shortest at noon.
[2 marks]
15. A student placed a pencil in a glass of water. The pencil appears bent at the water surface.
(a) Name the phenomenon that causes this observation.
[1 mark]
(b) Explain why the pencil appears bent.
[2 marks]
16. State one difference between how a transparent material and a translucent material affect light.
[2 marks]
Section C: Application & Reasoning (Questions 17–20)
Answer each question clearly. Show your reasoning where required.
17. Priya set up an experiment with three cards, each with a small hole in the centre. The cards were placed in a straight line in front of a candle.
Card A Card B Card C Candle
O O O )
(a) What will Priya observe on the screen placed after Card C? Draw or describe what she sees.
[2 marks]
(b) What does this experiment prove about the path of light?
[1 mark]
18. The diagram shows a periscope made using two plane mirrors.
___________
| |
--> | | -->
|___________|
Mirror 1 Mirror 2
(a) Draw the path of light from the object to the eye through the periscopic system. Indicate the direction of light with arrows.
[2 marks]
(b) State one real-life use of a periscope.
[1 mark]
19. A red shirt is placed in a dark room and illuminated with blue light.
(a) What colour will the shirt appear to be?
[1 mark]
(b) Explain your answer.
[2 marks]
20. The diagram shows sunlight passing through a raindrop.
Sunlight (white)
\
\
.-'-.
/ \
| |
\ /
'-.-'
|
| Coloured light
v
(a) Name the process shown in the diagram.
[1 mark]
(b) Explain how this process produces a rainbow.
[3 marks]
End of Quiz
Answers
Primary 5 Science Quiz - Light
Answer Key
Section A: Multiple Choice (1 mark each)
1. (C) straight
Explanation: Light travels in a straight line. This is a fundamental property of light and can be demonstrated using the pinhole camera experiment.
2. (C) The Sun
Explanation: The Sun produces its own light and is therefore a natural source of light. The Moon only reflects sunlight and does not produce its own light. A torch and a light bulb are artificial/man-made sources.
3. (B) reflected
Explanation: When light hits a smooth, shiny surface (such as a mirror), it bounces back. This is called reflection.
4. (B) travels in a straight line and cannot pass through opaque objects
Explanation: Because light travels in a straight line, it cannot bend around opaque objects. The region behind the opaque object where light cannot reach forms a shadow.
5. (C) Clear glass
Explanation: Clear glass is transparent and allows most light to pass through. Wood, metal, and cardboard are opaque and block light.
6. (B) inverted and real
Explanation: In a pinhole camera, light from the top of the object passes through the pinhole and reaches the bottom of the screen, and vice versa. This produces an inverted (upside-down) real image.
7. (C) A book
Explanation: A book is opaque — it does not allow light to pass through. Clear plastic is transparent, frosted glass is translucent, and water is transparent.
8. (C) dispersion
Explanation: Dispersion is the splitting of white light into its component colours (red, orange, yellow, green, blue, indigo, violet) when it passes through a prism.
9. (B) reflects
Explanation: The colour of an opaque object is determined by the colour of light it reflects. For example, a red apple reflects red light and absorbs all other colours.
10. (C) refracted and reflected
Explanation: A rainbow is formed when sunlight enters water droplets, is refracted (bent), reflected off the inner surface of the droplet, and refracted again as it exits, separating into different colours.
Section B: Short Answer
11. [2 marks]
Two properties of light (any two of the following, 1 mark each):
- Light travels in a straight line.
- Light can be reflected.
- Light can be refracted.
- Light travels at high speed.
- Light enables us to see objects.
- Light can be absorbed by objects.
Marking note: Award 1 mark for each correct property, up to a maximum of 2 marks. Vague answers such as "light is bright" are not accepted.
12. [3 marks]
| Material | Transparent / Translucent / Opaque |
|---|---|
| Clear plastic sheet | Transparent |
| Tissue paper | Translucent |
| Brick wall | Opaque |
Marking note: 1 mark for each correct classification.
13. (a) [1 mark]
The ray approaching the mirror is the incident ray. The ray bouncing off the mirror is the reflected ray. Both must be correctly labelled on the diagram.
Marking note: Award 1 mark if both rays are correctly identified. No mark if only one is correct.
(b) [1 mark]
The angle of incidence is equal to the angle of reflection.
(Or: angle of incidence = angle of reflection)
14. [2 marks]
In the early morning and late afternoon, the Sun is low in the sky, so light hits the object at a shallow angle, producing a long shadow. [1 mark] At noon, the Sun is high in the sky (almost directly overhead), so light hits the object from above, producing a short shadow. [1 mark]
Marking note: Award 1 mark for each correct explanation. The answer must refer to the position/angle of the Sun and the resulting shadow length.
15. (a) [1 mark]
Refraction (of light).
(b) [2 marks]
Light travels at different speeds in air and water. [1 mark] When light passes from water to air, it bends at the surface, causing the pencil to appear bent or displaced. [1 mark]
Marking note: Award 1 mark for mentioning different speeds in different media, and 1 mark for explaining the bending/displacement effect. Simply saying "light bends" without explanation earns only 1 mark.
16. [2 marks]
A transparent material allows most light to pass through, so objects can be seen clearly through it. [1 mark] A translucent material allows only some light to pass through, so objects appear blurry or cannot be seen clearly through it. [1 mark]
Marking note: The key distinction is clarity of vision through the material. Answers that only state "transparent lets light through, translucent lets some light through" without mentioning visibility earn 1 mark only.
Section C: Application & Reasoning
17. (a) [2 marks]
Priya will observe an inverted (upside-down) image of the candle flame on the screen. [1 mark] The image will be real and upside down. [1 mark]
Alternative: A drawing showing an inverted candle flame on the screen is also acceptable for full marks.
(b) [1 mark]
This experiment proves that light travels in a straight line.
18. (a) [2 marks]
The light path should show:
- Light from the object strikes Mirror 1 (top mirror) and reflects downward. [1 mark]
- The reflected light then strikes Mirror 2 (bottom mirror) and reflects into the eye. [1 mark]
Drawing note: The path should form a "Z" or stepped pattern with arrows indicating direction. Both reflection points must be shown with correct angles.
(b) [1 mark]
One real-life use of a periscope:
- Used in submarines to see above the water surface.
- Used in trenches during warfare to observe without exposing oneself.
- Used in some buildings/vehicles to see over obstacles.
Marking note: Any valid real-life application earns 1 mark.
19. (a) [1 mark]
The shirt will appear black (or very dark).
(b) [2 marks]
A red shirt reflects red light and absorbs all other colours. [1 mark] Under blue light, there is no red light to reflect, so the shirt absorbs the blue light and reflects almost no light, making it appear black. [1 mark]
Marking note: Award 1 mark for stating that the shirt absorbs blue light, and 1 mark for explaining that no red light is available to reflect. Simply saying "it absorbs the light" without mentioning the colour-specific reflection earns only 1 mark.
20. (a) [1 mark]
Dispersion (of light).
(b) [3 marks]
- Sunlight (white light) enters the raindrop and is refracted (bent). [1 mark]
- Different colours of light are refracted by different amounts — red light bends the least and violet bends the most. [1 mark]
- The light is also reflected inside the raindrop and refracted again as it exits, causing the colours to spread out and form a rainbow. [1 mark]
Marking note: Award 1 mark for mentioning refraction upon entry, 1 mark for explaining that different colours bend by different amounts, and 1 mark for mentioning internal reflection and/or the final separation of colours. Answers that only say "light is split into colours" without explaining the mechanism earn a maximum of 1 mark.
End of Answer Key