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Eighth Grade (Grade 8) Waves and Sound Questions

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Grade 8 Waves and Sound
Which term is used to differentiate one sound from another based on its quality?
  1. Frequency
  2. Timbre
  3. Pitch
  4. Amplitude
Grade 8 Waves and Sound
Why is ultrasonography considered safer than X-rays?
  1. Ultrasonic waves are more effective in imaging internal organs.
  2. Ultrasonic waves are less harmful to human tissues.
  3. Ultrasonography requires lower radiation exposure.
  4. Ultrasonography provides faster results.
Grade 8 Waves and Sound
Which of the following animals use echolocation to locate their food?
  1. Lions
  2. Beluga whales
  3. Elephants
  4. Giraffes
Grade 8 Waves and Sound
What type of surfaces tend to provide the best reflection for sound waves?
  1. Soft, absorbent surfaces
  2. Transparent surfaces
  3. Smooth, hard surfaces
  4. Curved surfaces
Grade 8 Waves and Sound
What is the phenomenon where a sound wave bounces back upon striking a solid surface?
  1. Echolocation
  2. Ultrasonography
  3. Reflection of sound waves
  4. Sonar technology
Grade 8 Waves and Sound
Particles of the medium move parallel to the direction of energy motion
  1. the highest point of the wave
  2. the lowest point of the wave
  3. the region where particles are less crowded than usual
  4. the region where particles are crowded together
Grade 8 Waves and Sound
What happens when the speaker cone moves in a forward direction?
  1. Rarefaction occurs
  2. No change in air particles
  3. Compression occurs
  4. Vacuum is created
Grade 8 Waves and Sound
Which of the following mediums sound waves can travel?
  1. Air or water
  2. Light or electricity
  3. Solid objects only
  4. Vacuum
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