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Primary 6 PSLE Science Light Quiz
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Questions
Primary 6 PSLE 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 for each question are shown in brackets [ ].
- You may use a calculator where necessary.
- The use of correction fluid/tape is not allowed.
Section A: Multiple Choice Questions (10 marks)
Questions 1–10 carry 1 mark each. Choose the most suitable answer (A, B, C, or D) and write it in the space provided.
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 candle flame (B) The Moon (C) A torch (D) The Sun
Answer: ___________
3. When light hits a smooth, shiny surface, it is _____________.
(A) absorbed (B) reflected (C) refracted (D) dispersed
Answer: ___________
4. The shadow of an object is formed because _____________.
(A) light bends around the object (B) light travels in a straight line and cannot pass through the object (C) the object absorbs all the light (D) light is refracted by the object
Answer: ___________
5. A rainbow is formed when white light is _____________ by water droplets in the air.
(A) absorbed (B) reflected (C) dispersed (D) blocked
Answer: ___________
6. Which colour of light has the longest wavelength?
(A) Violet (B) Blue (C) Green (D) Red
Answer: ___________
7. When white light passes through a glass prism, it is separated into different colours. This is because different colours of light are _____________ by different amounts.
(A) absorbed (B) reflected (C) refracted (D) scattered
Answer: ___________
8. The image formed in a pinhole camera is _____________.
(A) upright and magnified (B) inverted and magnified (C) upright and diminished (D) inverted and diminished
Answer: ___________
9. Which of the following materials allows most light to pass through it?
(A) Wooden board (B) Frosted glass (C) Clear glass (D) Brick wall
Answer: ___________
10. The length of a shadow cast by a stick during the day is shortest at _____________.
(A) sunrise (B) noon (C) late afternoon (D) sunset
Answer: ___________
Section B: Short-Answer Questions (20 marks)
Questions 11–18 carry 2 or 3 marks each. Write your answers in the spaces provided.
11. State two properties of light.
(a) _______________________________________________________________
(b) _______________________________________________________________
[2]
12. The diagram below shows a ray of light hitting a plane mirror.
normal
|
|
------|------ mirror
|
↘ |
↘ |
↘ |
The angle between the incident ray and the mirror surface is 35°.
(a) What is the angle of incidence? _____________° [1]
(b) What is the angle of reflection? _____________° [1]
[2]
13. Priya placed a pencil in a glass of water. She observed that the pencil appeared bent at the water surface.
(a) Name the phenomenon that causes the pencil to appear bent.
_______________________________________________________________ [1]
(b) Explain why this phenomenon occurs.
_______________________________________________________________ [1]
[2]
14. A student set up an experiment using a cardboard with a small hole and a screen behind it, as shown below.
Candle → | | → Screen
pinhole
(a) What is this setup called? _________________________________ [1]
(b) State one characteristic of the image formed on the screen.
_______________________________________________________________ [1]
[2]
15. Explain why the sky appears blue during a clear day.
_______________________________________________________________ [2]
16. A white object is illuminated with red light only. What colour will the object appear? Explain your answer.
Colour: _________________________________ [1]
Explanation: _______________________________________________________________
_______________________________________________________________ [1]
[2]
17. Study the diagram showing the path of white light through a glass prism.
/\
/ \
/ \
/ \
/ /\ \
/ / \ \
/ / \ \
/___/______\___\
Red
Violet
(a) Name the process shown in the diagram. _________________________ [1]
(b) Which colour of light is refracted the most? _________________________ [1]
(c) Give a natural phenomenon that demonstrates this process.
_______________________________________________________________ [1]
[3]
18. The diagram shows a person standing near a lamp post at night.
Lamp post
|
|
|
|
---- ← Person
(a) On the diagram above, draw the shadow of the person on the ground. [1]
(b) Explain why the shadow is formed.
_______________________________________________________________ [1]
[2]
Section C: Structured / Application Questions (10 marks)
Questions 19–20 carry 5 marks each. Answer in complete sentences where required.
19. A student conducted an investigation using three identical cards (A, B, and C), each with a hole at the centre. The cards were placed upright in front of a light source at different distances, as shown below.
Light source ---[Card A]---[Card B]---[Card C]--- Screen
10 cm 20 cm 30 cm
The student observed the size of the light spot (image) on the screen.
(a) What is the aim of this investigation?
_______________________________________________________________ [1]
(b) Identify the variable that was changed (manipulated variable) in this investigation.
_______________________________________________________________ [1]
(c) Predict what the student would observe about the size of the light spot on the screen. Explain your prediction.
Observation: _______________________________________________________________
_______________________________________________________________ [1]
Explanation: _______________________________________________________________
_______________________________________________________________ [1]
(d) State one variable that should be kept the same (constant variable) to ensure a fair test.
_______________________________________________________________ [1]
[5]
20. Read the following passage and answer the questions that follow.
During a thunderstorm, lightning is seen before thunder is heard. This is because light travels much faster than sound. Light travels at approximately 300,000,000 m/s, while sound travels at about 340 m/s in air. This difference in speed also explains why we see a distant fireworks display before hearing the sound.
(a) State the speed of light in air. _________________________________ [1]
(b) A boy sees a lightning flash and hears the thunder 6 seconds later. Calculate how far away the lightning strike occurred. (Use speed of sound = 340 m/s.)
Working:
_______________________________________________________________ [2]
(c) Explain why the lightning and thunder actually happen at the same time, even though we see the lightning first.
_______________________________________________________________ [1]
(d) Give one other everyday example where we observe light before hearing sound.
_______________________________________________________________ [1]
[5]
END OF PAPER
Answers
Primary 6 PSLE Science Quiz - Light
Answer Key
Section A: Multiple Choice Questions (10 × 1 mark = 10 marks)
1. C — straight
Light travels in a straight line (rectilinear propagation).
2. D — The Sun
The Sun is a natural source of light. A candle flame and a torch are artificial sources. The Moon only reflects light from the Sun and does not produce its own light.
3. B — reflected
When light hits a smooth, shiny surface, it bounces off (reflection).
4. B — light travels in a straight line and cannot pass through the object
Shadows are formed because light travels in straight lines and opaque objects block the light.
5. C — dispersed
A rainbow is formed when white light is dispersed (split into its component colours) by water droplets.
6. D — Red
In the visible spectrum, red has the longest wavelength (~700 nm) and violet has the shortest (~400 nm).
7. C — refracted
Different colours of light are refracted by different amounts when passing through a prism, causing dispersion.
8. D — inverted and diminished
A pinhole camera forms a real, inverted image. The size depends on the distances involved but is typically diminished.
9. C — Clear glass
Clear glass is transparent and allows most light to pass through. Wooden board and brick wall are opaque; frosted glass is translucent.
10. B — noon
At noon, the Sun is at its highest point in the sky, so the shadow cast is the shortest.
Section B: Short-Answer Questions (20 marks)
11. [2 marks] (a) Light travels in a straight line. [1] (b) Light can be reflected / refracted / dispersed / absorbed. [1]
Accept any two valid properties of light.
12. [2 marks] (a) Angle of incidence = 90° − 35° = 55° [1]
The angle of incidence is measured from the normal, not the mirror surface.
(b) Angle of reflection = 55° [1]
By the law of reflection, angle of incidence = angle of reflection.
13. [2 marks] (a) Refraction [1]
(b) Light travels at different speeds in water and air. When light passes from water to air, it changes speed and bends, causing the pencil to appear bent at the water surface. [1]
Key point: change in speed of light in different media causes bending.
14. [2 marks] (a) Pinhole camera [1]
(b) The image is inverted (upside down) / real / diminished [1]
Accept any one valid characteristic.
15. [2 marks] The sky appears blue because of scattering of sunlight by gas molecules in the atmosphere. [1] Blue light has a shorter wavelength and is scattered more than other colours, so the sky appears blue. [1]
Must mention scattering and the reason (shorter wavelength scattered more).
16. [2 marks] Colour: Red [1]
Explanation: A white object reflects all colours of light. When illuminated with only red light, only red light is available to be reflected, so the object appears red. [1]
Key concept: the colour of an object depends on the colour of light illuminating it and the colour it reflects.
17. [3 marks] (a) Dispersion [1]
(b) Violet [1]
Violet light has the shortest wavelength and is refracted the most.
(c) Formation of a rainbow [1]
Accept any valid natural phenomenon involving dispersion of white light.
18. [2 marks] (a) The shadow should be drawn on the ground on the side of the person opposite to the lamp post. The shadow should be a dark region directly behind the person (relative to the light source). [1]
Award mark for correct position and reasonable shape of the shadow.
(b) The shadow is formed because light travels in a straight line and cannot pass through the opaque person, so a dark region (shadow) is formed behind the person. [1]
Must mention: light travels in straight lines + object is opaque/blocks light.
Section C: Structured / Application Questions (10 marks)
19. [5 marks] (a) To investigate how the distance of the card (pinhole) from the light source affects the size of the light spot (image) on the screen. [1]
Accept any clearly stated aim related to the variables in the experiment.
(b) The distance of the card from the light source (or the position of the card). [1]
(c) Observation: The light spot on the screen will be larger when the card is closer to the light source (Card A) and smaller when the card is farther from the light source (Card C). [1]
Explanation: When the pinhole is closer to the light source, the cone of light passing through the hole spreads out more before reaching the screen, producing a larger spot. When the pinhole is farther from the light source, the light is more focused, producing a smaller spot. [1]
Accept equivalent explanations based on the geometry of light rays passing through the pinhole.
(d) The size of the hole / the distance between the last card and the screen / the brightness of the light source [1]
Accept any one reasonable constant variable.
20. [5 marks] (a) 300,000,000 m/s (or 3 × 10⁸ m/s) [1]
(b) Working: Distance = Speed × Time [1] Distance = 340 m/s × 6 s = 2,040 m [1]
Award 1 mark for correct formula and 1 mark for correct answer with unit.
(c) Lightning and thunder occur at the same time and place. We see the lightning first because light travels much faster than sound, so the light reaches our eyes before the sound reaches our ears. [1]
Key point: simultaneous events; difference in arrival time is due to different speeds.
(d) Seeing a distant firework explosion before hearing the sound / seeing a person hammering a nail from far away before hearing the sound / seeing a cricket bat hit a ball before hearing the sound [1]
Accept any valid everyday example where light is observed before sound is heard.
Total: 40 marks