Science 3 · Unit 3: Light and shadows · Cambridge Primary Science Stage 3

Questions

1. 1. How is a shadow made?

   • A light source turns off.
   • An object makes its own darkness.
   • Light passes through a transparent object.
   • Light is blocked by an opaque object.
   Check

2. 2. What does opaque mean?

   • Light cannot pass through it.
   • It makes light.
   • You can see clearly through it.
   • It is very shiny.
   Check

3. 3. What does transparent mean?

   • It makes light.
   • It makes a dark shadow.
   • It blocks all light.
   • Light passes through and you can see clearly through it.
   Check

4. 4. What colour are shadows?

   • white
   • They have no colour; they are always dark.
   • the same colour as the object
   • bright yellow
   Check

5. 5. Does a shadow show details like eyes or a mouth?

   • Yes
   • No
   Check

6. 6. Mia has two shadows. Why?

   • It is night time.
   • There are two light sources.
   • She is transparent.
   • She has two bodies.
   Check

7. 7. Why is glass very good for making windows?

   • It is soft.
   • It is transparent.
   • It makes shadows.
   • It is opaque.
   Check

8. 8. Which material makes the darkest shadow?

   • clear glass
   • card
   • clear plastic
   • clean water
   Check

9. 9. Do transparent materials make a shadow?

   • Yes
   • No
   Check

10. 10. Why do shadow puppets use card?

    • Card makes light.
    • Card is shiny.
    • Card is transparent.
    • Card is opaque, so it blocks the light.
    Check

11. 11. Is a shadow always the same shape and size as the object?

    • Yes
    • No
    Check

12. 12. How can you test if a material is opaque or transparent?

    • shine a flashlight at it and see if light passes through
    • put it in water
    • weigh it
    • smell it
    Check

13. 13. Why must you never look into a bright light source?

    • It turns off.
    • It makes you taller.
    • It can damage your eyes.
    • It makes shadows.
    Check

14. 14. Which would not make a good window?

    • clear glass
    • see-through perspex
    • clear plastic
    • a sheet of wood
    Check

15. 15. You want to make a sunshade. Should you use an opaque or a transparent material?

    • opaque
    • transparent
    Check