Waves and Sound Quiz

Grade 8 · Science · Quiz

10 questions on wave types, properties, sound behavior, and real-world applications.

Questions

  1. In a transverse wave, particles move:

    1. Parallel to the wave direction
    2. Perpendicular to the wave direction
    3. In circles
    4. Randomly
    Show answer

    Answer: Perpendicular to the wave direction

    Transverse waves have particle movement perpendicular (at right angles) to the direction of energy travel.

  2. What is the unit for measuring frequency?

    1. Meter (m)
    2. Hertz (Hz)
    3. Newton (N)
    4. Pascal (Pa)
    Show answer

    Answer: Hertz (Hz)

    Frequency (cycles per second) is measured in Hertz, named after physicist Heinrich Hertz.

  3. A higher frequency sound wave has a higher pitch.

    Show answer

    Frequency directly determines pitch — higher frequency = higher pitch sound.

  4. The compressions and rarefactions in a longitudinal wave correspond to what in a transverse wave?

    1. Amplitude and wavelength
    2. Crests and troughs
    3. Frequency and speed
    4. Nodes and antinodes
    Show answer

    Answer: Crests and troughs

    Compressions (high density regions) correspond to crests; rarefactions (low density) correspond to troughs.

  5. If a wave has a frequency of 200 Hz and a wavelength of 1.5 m, what is its speed?

    1. 133 m/s
    2. 300 m/s
    3. 201.5 m/s
    4. 0.0075 m/s
    Show answer

    Answer: 300 m/s

    Wave speed = frequency × wavelength = 200 Hz × 1.5 m = 300 m/s.

  6. Which property of a wave is directly related to the amount of energy it carries?

    1. Frequency
    2. Wavelength
    3. Amplitude
    4. Speed
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    Answer: Amplitude

    Greater amplitude means more energy. This is why louder sounds (larger amplitude) are more energetic.

  7. The distance between two consecutive crests of a wave is called the ___.

    Show answer

    Wavelength is measured from any point on a wave to the identical point on the next wave.

  8. Sound travels faster in water than in air.

    Show answer

    Water's denser, more tightly packed molecules transmit sound vibrations faster than the spread-out molecules in air.

  9. The Doppler Effect describes:

    1. How sound travels through different media
    2. The change in perceived frequency when a source moves relative to the observer
    3. How amplitude affects loudness
    4. The reflection of sound waves
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    Answer: The change in perceived frequency when a source moves relative to the observer

    A moving ambulance siren sounds higher-pitched as it approaches and lower-pitched as it moves away — this is the Doppler Effect.

  10. Which type of wave does NOT require a medium to travel?

    1. Sound wave
    2. Seismic wave
    3. Water wave
    4. Light wave
    Show answer

    Answer: Light wave

    Light is an electromagnetic wave that can travel through a vacuum. Sound and seismic waves are mechanical and require a medium.

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