Science 7 · Unit 6: Earth physics · Cambridge Lower Secondary Science Stage 7

Questions

1. 1. Zara plays the violin. What must happen for Sofia to hear it from across the room?

   • Particles in the air vibrate.
   • The air moves from the violin towards Sofia.
   • Objects in the room vibrate.
   • Particles outside the room vibrate.
   Check

2. 2. True or false: Sound travels through solid wood.

   • True
   • False
   Check

3. 3. True or false: Sound travels through water.

   • True
   • False
   Check

4. 4. True or false: Sound travels through a vacuum.

   • True
   • False
   Check

5. 5. Complete the sentence: Sound does not travel through ... because there are no particles.

   • a gas
   • solids
   • a vacuum
   • liquids
   Check

6. 6. A sound wave travels straight down from a ship through the water. How do the water particles move?

   • They vibrate up and down.
   • They vibrate from side to side.
   • They do not move.
   • They vibrate randomly.
   Check

7. 7. Why does sound not travel in a vacuum?

   • There are no particles to vibrate and pass on the sound.
   • It is too cold in a vacuum.
   • A vacuum is too dark.
   • The particles in a vacuum are too close together.
   Check

8. 8. Sofia holds her hand in front of a loudspeaker playing loud music. What will she feel?

   • heat only
   • a steady wind blowing away
   • vibrations
   • nothing at all
   Check

9. 9. Marcus models a sound wave with a slinky spring. How should he move the end?

   • Push and pull it along the length of the spring.
   • Move it from side to side.
   • Hold it still.
   • Twist it round.
   Check

10. 10. What does the slinky look like when it models a sound wave?

    • It makes an S shape from side to side.
    • All the coils stay the same distance apart.
    • Some parts have the coils bunched together, and others have them spread out.
    • It twists into a knot.
    Check

11. 11. The speed of sound in air is 340 metres per second. In solid concrete it is 2950 metres per second. Why is sound faster in concrete?

    • Concrete has no particles.
    • The particles are closer together, so the vibrations are passed on more quickly.
    • Concrete is a vacuum.
    • Air is heavier than concrete.
    Check

12. 12. People who work beside aeroplanes wear ear protection. Why can loud sounds damage people's ears?

    • Aeroplanes give out harmful light.
    • Ear protection helps them hear better.
    • Very loud sounds make large vibrations that can damage the ear.
    • The wind is cold.
    Check

13. 13. Complete the sentence. Sound travels through air as a sound ...

    • current
    • wave
    • stream
    • wind
    Check

14. 14. What is the substance that a sound wave moves through called?

    • the echo
    • the medium
    • the vacuum
    • the source
    Check

15. 15. An electric bell is ringing inside a glass jar. The air is pumped out of the jar to make a vacuum. What happens?

    • The bell stops vibrating.
    • You can hear the bell more loudly.
    • You can see the bell vibrating, but you cannot hear it.
    • You can hear the bell, but you cannot see it.
    Check

16. 16. The Moon has no atmosphere. People working close together on the Moon could not hear their hammering. Why?

    • The Moon is too cold for sound.
    • The sound travelled too fast to hear.
    • There are no particles outside their suits to carry the sound.
    • Their hammers did not vibrate.
    Check

17. 17. Films often show a loud bang when something explodes in space. Would you really hear an explosion in space?

    • No, because explosions do not make vibrations.
    • Yes, because explosions are very loud.
    • No, because space is a vacuum and sound cannot travel through it.
    • Yes, because sound travels faster in space.
    Check