Grade 7Sciencequiz16 questions

Light and sound waves

Grade 7: speed of light and sound, reflection and refraction, the eye, the ear.

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Free to play. Teams answer on one screen; your phone is the remote. No student devices.

Questions

  1. Which travels faster through air?

    • It depends on the loudness
    • Light
    • Sound
    • They travel equally fast
    Show answerLight

  2. Sound cannot travel through which of these?

    • A vacuum
    • Air
    • Steel
    • Water
    Show answerA vacuum

  3. Sound usually travels faster in water than in air. (True or false?)

    Show answerTrue

  4. Thunder is heard 3 s after lightning. Sound travels about 340 m/s. How far away is it, in metres? (Answer out loud)

    Show answerAbout 1020 m

  5. What do we call the bouncing of light off a surface?

    • Absorption
    • Diffraction
    • Reflection
    • Refraction
    Show answerReflection

  6. A ray of light hits a flat mirror at 30° to the normal. What is the angle of reflection?

    • 15°
    • 30°
    • 60°
    • 90°
    Show answer30°

  7. Why does a straw look bent in a glass of water?

    • Light changes direction as it passes from water to air
    • Light is reflected by the straw
    • Light stops at the water surface
    • Water makes the straw soft
    Show answerLight changes direction as it passes from water to air

  8. Light bends when it enters water because it speeds up. (True or false?)

    Show answerFalse

  9. Which part of the eye changes shape to focus light?

    • The iris
    • The lens
    • The optic nerve
    • The pupil
    Show answerThe lens

  10. Which part of the eye contains the cells that detect light? (Answer out loud)

    Show answerThe retina

  11. What does the iris do in bright light?

    • Makes the pupil larger
    • Makes the pupil smaller
    • Sends sound to the brain
    • Turns the image upside down
    Show answerMakes the pupil smaller

  12. The image formed on the retina is upside down. (True or false?)

    Show answerTrue

  13. Which part of the ear vibrates first when sound arrives?

    • The cochlea
    • The eardrum
    • The lens
    • The retina
    Show answerThe eardrum

  14. Which part of the ear turns vibrations into nerve signals?

    • The cochlea
    • The ear canal
    • The eardrum
    • The outer ear flap
    Show answerThe cochlea

  15. The three tiny bones in the middle ear do what?

    • Detect smells in the air
    • Focus light on the retina
    • Pass vibrations on to the inner ear
    • Produce earwax
    Show answerPass vibrations on to the inner ear

  16. What is the name of the ear part you can see on the side of your head? (Answer out loud)

    Show answerThe pinna (outer ear)

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