Sound and Vibration Quiz

Grade 3 · Science · Quiz

Test your knowledge of sound, vibration, pitch, and how sound travels.

Questions

1. When a guitar string stops vibrating, the sound stops.

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   Answer: True

   Sound only exists while the source is vibrating. Once vibrations stop, there are no more sound waves being produced.

2. A piccolo makes a higher pitch than a tuba because its vibrations are:

   1. Bigger
   2. Slower
   3. Faster
   4. Louder
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   Answer: Faster

   The piccolo vibrates much faster than a tuba's low tubes. Higher frequency (faster vibrations) = higher pitch.

3. Sound energy travels through the air in ___.

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   Answer: waves

   Sound energy moves through air as pressure waves — alternating regions of compressed and spread-out air molecules.

4. Which of these would NOT allow sound to travel through it?

   1. Water
   2. Wood
   3. Steel
   4. A vacuum
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   Answer: A vacuum

   Sound needs a medium (matter) to travel through. A vacuum has no matter, so sound cannot travel through it at all.

5. Whispering makes a larger vibration than shouting.

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   Answer: False

   Shouting creates bigger, stronger vibrations than whispering. Bigger vibrations mean more energy and a louder sound.

6. What part of your ear vibrates when sound waves reach you?

   1. Earlobe
   2. Eardrum
   3. Ear canal
   4. Inner ear fluid only
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   Answer: Eardrum

   The eardrum is a thin membrane that vibrates when sound waves reach it. These vibrations are passed to tiny bones in the middle ear and then to the inner ear.

7. The loudness of a sound is called its ___.

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   Answer: volume

   Volume (or loudness) describes how strong or weak a sound is. It's measured in decibels (dB).

8. Sound travels faster through air than through water.

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   Answer: False

   Sound actually travels about 4.3 times faster in water than in air because water molecules are closer together and can pass vibrations along more quickly.

9. You pluck a thick guitar string and a thin guitar string with the same force. Which makes a higher pitch?

   1. The thick string
   2. The thin string
   3. They sound the same
   4. You can't tell
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   Answer: The thin string

   Thinner strings vibrate faster, producing higher-pitched sounds. Thicker strings vibrate more slowly and produce lower pitches.

10. Vibrations too fast or too slow for humans to hear still exist as sound waves.

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    Answer: True

    Ultrasound (too high for humans) and infrasound (too low for humans) are real sound waves. Dogs can hear higher frequencies than humans; elephants communicate with infrasound.

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