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Primary 4 Science Light Quiz

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Primary 4 Science AI Generated Generated by Owl Alpha Updated 2026-06-04
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Questions

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Primary 4 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.
  • Read each question carefully before answering.
  • The number of marks for each question is shown in brackets [ ].

Section A: Multiple Choice Questions (10 marks)

Questions 1–10: Choose the most correct answer. Write the letter (A, B, C, or D) in the space provided.

1. Light travels in a __________ line.

(A) curved (B) zigzag (C) straight (D) circular

Answer: ___________ [1]

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: ___________ [1]

3. When an object blocks light, a __________ is formed.

(A) reflection (B) shadow (C) rainbow (D) beam

Answer: ___________ [1]

4. A shadow is darkest when the object is __________ the light source.

(A) far from (B) near to (C) the same distance as (D) behind

Answer: ___________ [1]

5. Which material allows most light to pass through?

(A) Wood (B) Metal (C) Clear glass (D) Cardboard

Answer: ___________ [1]

6. The size of a shadow becomes __________ when the object moves closer to the light source.

(A) smaller (B) bigger (C) the same (D) invisible

Answer: ___________ [1]

7. Light cannot pass through __________ objects.

(A) transparent (B) translucent (C) opaque (D) clear

Answer: ___________ [1]

8. When you look at yourself in a mirror, you see a __________ of yourself.

(A) shadow (B) reflection (C) source (D) beam

Answer: ___________ [1]

9. Which of the following is NOT a source of light?

(A) A glowing firefly (B) A burning candle (C) A shiny spoon (D) A lit oil lamp

Answer: ___________ [1]

10. A translucent object __________.

(A) blocks all light (B) allows all light to pass through (C) allows some light to pass through (D) produces its own light

Answer: ___________ [1]

Section B: Short Answer Questions (20 marks)

Questions 11–16: Write your answers in the spaces provided.

11. State two properties of light.

(a) _______________________________________________________________ [1]

(b) _______________________________________________________________ [1]

12. The diagram below shows a torch shining on a book. Draw the shadow that would be formed on the screen.

   Torch  ●━━━━━━━▶  | Book |  ████████  Screen

Describe the shape of the shadow and explain why it is formed.

Shape of shadow: _________________________________________________ [1]

Explanation: ______________________________________________________

_________________________________________________________________ [1]

13. Complete the table below by classifying each material as transparent, translucent, or opaque.

MaterialClassification
Clear plastic sheet_______________ [1]
Frosted glass_______________ [1]
Wooden door_______________ [1]

14. Priya placed a stick in the school field at 9 a.m. and observed its shadow. She came back at 12 noon and observed the shadow again.

(a) At which time was the shadow shorter? _____________________________ [1]

(b) Explain your answer.

_________________________________________________________________ [1]

15. Explain why we cannot see objects in a completely dark room.

_________________________________________________________________ [2]

16. Study the diagram below.

        Sun
         ☀
          \
           \  light rays
            \
    ┌─────────────┐
    │   Person     │
    └─────────────┘
            \
             \
              ████████████
              Shadow on ground

(a) What happens to the length of the shadow when the Sun is higher in the sky?

_________________________________________________________________ [1]

(b) At what time of day would the shadow be the longest? _________________ [1]

Section C: Structured / Application Questions (10 marks)

Questions 17–20: Answer all questions. Show your reasoning clearly.

17. A student set up the following experiment:

  • She placed a torch 30 cm from a toy figure.
  • She measured the shadow on a white screen behind the figure.
  • She then moved the torch to 15 cm from the figure and measured the shadow again.

(a) Predict what happened to the size of the shadow when the torch was moved closer to the figure.

_________________________________________________________________ [1]

(b) Explain your prediction using what you know about how light travels.

_________________________________________________________________ [2]

18. The table below shows the results of an investigation. Four identical blocks were placed one at a time between a torch and a screen. The distance between the torch and the screen was kept the same.

Block materialLight detected on screen
Clear glassBright
Tissue paperDim
Aluminium foilNone
Thin clothSlightly dim

(a) Which material is opaque? Explain your answer.

_________________________________________________________________ [1]

(b) Which material is translucent? Explain your answer.

_________________________________________________________________ [1]

(c) Suggest a real-life use for a translucent material and explain why it is suitable.

_________________________________________________________________ [1]

19. Amir stood between a wall and a bright lamp in the school hall.

(a) A shadow of Amir appeared on the wall. Explain how this shadow is formed.

_________________________________________________________________ [2]

(b) Amir then walked towards the lamp. Describe what happened to the size of his shadow on the wall.

_________________________________________________________________ [1]

20. Read the following scenario and answer the question.

During a solar eclipse, the Moon moves between the Earth and the Sun. People in certain areas on Earth can no longer see the Sun clearly.

Using your knowledge of how light travels, explain why a solar eclipse occurs.

_________________________________________________________________ [2]

End of Quiz

Answers

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Primary 4 Science Quiz - Light

Answer Key

Total Marks: 40

Section A: Multiple Choice Questions (10 marks)

1. (C) straight

  • Light travels in a straight line. This is a fundamental property of light.
  • [1 mark] for correct answer.

2. (C) The Sun

  • The Sun produces its own light and is a natural source of light.
  • A torch and light bulb are man-made sources. The Moon does not produce its own light; it reflects sunlight.
  • [1 mark] for correct answer.

3. (B) shadow

  • When an opaque object blocks light, a shadow is formed on the opposite side of the light source.
  • [1 mark] for correct answer.

4. (B) near to

  • When the object is closer to the light source, it blocks more of the spreading light rays, producing a larger and darker shadow. The darkest shadow occurs when the object is nearest to the light source because the greatest concentration of light is blocked.
  • [1 mark] for correct answer.

5. (C) Clear glass

  • Clear glass is transparent and allows most light to pass through. Wood, metal, and cardboard are opaque and block light.
  • [1 mark] for correct answer.

6. (B) bigger

  • When the object moves closer to the light source, the light rays spread out more behind the object, making the shadow larger.
  • [1 mark] for correct answer.

7. (C) opaque

  • Opaque objects do not allow light to pass through them. Transparent objects allow all light through; translucent objects allow some light through.
  • [1 mark] for correct answer.

8. (B) reflection

  • A mirror reflects light, producing an image of the object in front of it. This is called a reflection.
  • [1 mark] for correct answer.

9. (C) A shiny spoon

  • A shiny spoon reflects light but does not produce its own light, so it is not a source of light. Fireflies, candles, and oil lamps all produce their own light.
  • [1 mark] for correct answer.

10. (C) allows some light to pass through

  • A translucent object allows some (but not all) light to pass through. Examples include frosted glass and tissue paper.
  • [1 mark] for correct answer.

Section B: Short Answer Questions (20 marks)

11. [2 marks]

  • (a) Light travels in a straight line. [1]
  • (b) Light cannot pass through opaque objects. [1]
  • Acceptable alternatives for (b): Light can be reflected / Light enables us to see objects / Light travels very fast.
  • Award 1 mark each for any two correct properties of light.

12. [3 marks]

  • Shape of shadow: Rectangular / book-shaped (same outline as the book). [1]
  • Explanation: Light travels in straight lines from the torch. The book is opaque and blocks the light. The area behind the book where light cannot reach forms a shadow that has the same shape as the book. [1]
  • Marking note: The drawing should show a dark rectangular shape on the screen. Award [1] for a reasonable shadow shape drawn on the screen area.

13. [3 marks]

  • Clear plastic sheet: Transparent [1]
  • Frosted glass: Translucent [1]
  • Wooden door: Opaque [1]
  • Award 1 mark each for correct classification.

14. [3 marks]

  • (a) 12 noon [1]
  • (b) At 12 noon, the Sun is higher in the sky (closer to directly overhead). When the Sun is higher, the light rays hit the stick at a steeper angle, so the shadow cast is shorter. At 9 a.m., the Sun is lower in the sky, so the shadow is longer. [1]
  • Marking note: Award [1] for mentioning that the Sun's position in the sky affects shadow length, and [1] for the correct comparison.

15. [2 marks]

  • We see objects when light reflects off them and enters our eyes. In a completely dark room, there is no light. Without light, there is no light reflecting off the objects, so our eyes cannot detect them. Therefore, we cannot see the objects. [2]
  • Marking note: Award [1] for mentioning that there is no light in a dark room. Award [1] for linking this to the inability to see (no light reflects into our eyes).

16. [3 marks]

  • (a) The shadow becomes shorter when the Sun is higher in the sky. [1]
  • (b) Early morning or late evening / sunrise or sunset. [1]
  • Marking note: Accept "early morning" or "late evening" or equivalent. Award [1] for correct time of day.

Section C: Structured / Application Questions (10 marks)

17. [3 marks]

  • (a) The shadow became bigger / larger. [1]
  • (b) Light travels in straight lines from the torch. When the torch is moved closer to the figure, the light rays spread out more behind the figure before reaching the screen. This means a larger area of the screen is blocked from light, so the shadow increases in size. [2]
  • Marking note: Award [1] for stating that light travels in straight lines. Award [1] for explaining that moving the torch closer causes the shadow to become larger.

18. [3 marks]

  • (a) Aluminium foil is opaque because no light was detected on the screen. This means it blocked all the light from the torch. [1]
  • (b) Tissue paper (or thin cloth) is translucent because only dim / slightly dim light was detected on the screen, meaning some light passed through but not all. [1]
  • Marking note: Accept either tissue paper or thin cloth as the translucent material. Award [1] for correct identification with a valid explanation.
  • (c) Example: A lampshade is made of translucent material. It allows some light to pass through to light up the room but reduces the glare from the bulb, making the light softer and more comfortable for the eyes. [1]
  • Marking note: Accept any reasonable real-life use (e.g., bathroom windows, curtains, shades). Award [1] for a suitable use with a correct explanation.

19. [3 marks]

  • (a) Light from the lamp travels in straight lines towards the wall. Amir's body is opaque and blocks the light. The area on the wall behind Amir where light cannot reach forms a shadow. [2]
  • Marking note: Award [1] for mentioning that light is blocked by Amir. Award [1] for stating that the shadow forms where light cannot reach the wall.
  • (b) The shadow on the wall became bigger / larger. [1]
  • Explanation: As Amir moves closer to the lamp, he blocks more of the spreading light rays, so the shadow projected onto the wall behind him becomes larger.

20. [2 marks]

  • Light from the Sun travels in straight lines. During a solar eclipse, the Moon moves between the Earth and the Sun. The Moon is opaque and blocks the light from the Sun. People on Earth who are in the area where the Moon's shadow falls cannot see the Sun clearly because the light from the Sun is blocked by the Moon. [2]
  • Marking note: Award [1] for stating that the Moon blocks the Sun's light. Award [1] for linking this to the formation of a shadow on Earth (people cannot see the Sun). Answers should demonstrate understanding that light travels in straight lines and the Moon casts a shadow on Earth.

End of Answer Key