Primary 4 Science Light Quiz

TuitionGoWhere Primary School (AI)

Primary 4 Science - Light Quiz 01

Name: _________________________ Date: _____________

Class: _________________________ Score: ______ / 15

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Section A: Multiple Choice Questions (1 mark each)

1. What happens when light passes from air into water?

A) It speeds up
B) It bends (refracts)
C) It reflects back
D) It disappears

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2. A rainbow is formed because white light:

A) Is absorbed by raindrops
B) Is reflected by raindrops
C) Is split into its component colours by raindrops
D) Passes through raindrops unchanged

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3. Which colour of light bends the most when passing through a prism?

A) Red
B) Yellow
C) Green
D) Violet

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4. An object that produces its own light is called:

A) Transparent
B) Luminous
C) Opaque
D) Translucent

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5. What causes a shadow to form?

A) Light passing through an object
B) Light bending around an object
C) Light being blocked by an opaque object
D) Light being absorbed by air

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Section B: Short Answer Questions (2 marks each)

6. What is the difference between reflection and refraction of light?

Answer: ___________________________________________________

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7. Name the seven colours of the visible spectrum in order.

Answer: _____________________________________________

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8. Why do we see colours? How does an object appear red?

Answer: ___________________________________________________

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9. What is the law of reflection?

Answer: ___________________________________________________

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10. Explain why a swimming pool looks shallower than it actually is.

Answer: ___________________________________________________

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Section C: Application Questions (2 marks each)

11. Why do diamonds sparkle so brilliantly?

Answer: ___________________________________________________

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12. Explain why we can see the Moon at night even though it is not a luminous object.

Answer: ___________________________________________________

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13. A pencil appears bent when placed in a glass of water. Explain this phenomenon.

Answer: ___________________________________________________

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14. Why do emergency vehicles have the word "AMBULANCE" written backwards on the front?

Answer: ___________________________________________________

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15. During a solar eclipse, the Moon's shadow falls on Earth. What can we conclude about the Moon based on this?

Answer: ___________________________________________________

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End of Quiz

TuitionGoWhere Primary School (AI)

Primary 4 Science - Light Quiz 01 - Answer Key

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Section A: Multiple Choice Questions (1 mark each)

1. B) It bends (refracts)
Light bends when it passes from one medium to another (air to water) because light travels at different speeds in different materials.

2. C) Is split into its component colours by raindrops
Raindrops act like tiny prisms, splitting white light into the spectrum of colours.

3. D) Violet
Violet light has the shortest wavelength and bends the most when passing through a prism.

4. B) Luminous
Luminous objects produce their own light (e.g., sun, stars, light bulbs).

5. C) Light being blocked by an opaque object
Shadows form when light cannot pass through an opaque object.

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Section B: Short Answer Questions (2 marks each)

6. Reflection: Light bounces off a surface (like a mirror).
Refraction: Light bends when passing from one medium to another (like from air to water).
Award 1 mark for each correct explanation.

7. Red, Orange, Yellow, Green, Blue, Indigo, Violet (ROYGBIV)
Award 2 marks for all correct in order, 1 mark for partially correct.

8. Objects absorb some colours of light and reflect others. We see the colour that is reflected. A red object appears red because it reflects red light and absorbs all other colours.
Award 2 marks for explaining reflection of colour and absorption of others.

9. The law of reflection states that the angle of incidence equals the angle of reflection. Light reflects off a surface at the same angle it hits the surface.
Award 2 marks for correct statement.

10. Light bends (refracts) when it passes from water to air. This causes the bottom of the pool to appear closer to the surface than it actually is, making the pool look shallower.
Award 2 marks for explaining refraction causing the illusion.

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Section C: Application Questions (2 marks each)

11. Diamonds have a high refractive index, meaning light bends a lot when entering and leaving the diamond. The diamond's cut creates many surfaces that reflect and refract light internally, splitting it into colours and creating the sparkle.
Award 2 marks for explaining high refraction and internal reflection.

12. The Moon is not luminous but it reflects light from the Sun. The sunlight hits the Moon's surface and bounces back towards Earth, allowing us to see the Moon.
Award 2 marks for explaining reflection of sunlight.

13. This is caused by refraction. Light travels at different speeds in water and air. When light from the pencil in water travels to your eyes through air, it bends at the water-air boundary. This makes the pencil appear bent or broken at the water surface.
Award 2 marks for explaining refraction at water-air boundary.

14. When drivers look in their rear-view mirror, they see a reflection. The mirror reverses the image, so "AMBULANCE" written backwards appears the correct way when viewed in a mirror. This allows drivers to quickly identify the emergency vehicle.
Award 2 marks for explaining mirror reflection and quick identification.

15. We can conclude that the Moon is an opaque object. Opaque objects do not allow light to pass through, so when the Moon comes between the Sun and Earth, it blocks the Sun's light and casts a shadow on Earth.
Award 2 marks for explaining that Moon is opaque and blocks light.

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Marking Scheme Summary

• Section A: 5 marks (5 questions × 1 mark)
• Section B: 10 marks (5 questions × 2 marks)
• Section C: 10 marks (5 questions × 2 marks)
• Total: 25 marks

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End of Answer Key