What causes sound waves?
  • Electromagnetic radiation
  • Vibrating sources
  • Temperature differences
  • Magnetic fields
In a longitudinal wave, particle vibration is:
  • Perpendicular to wave direction
  • Parallel to wave direction
  • Circular
  • Random
The region in a sound wave where particles are pushed together is called:
  • Rarefaction
  • Compression
  • Crest
  • Trough
The region in a sound wave where particles are less dense is called:
  • Rarefaction
  • Compression
  • Crest
  • Trough
The region in a sound wave where particles are under high pressure is called:
  • Rarefaction
  • Compression
  • Crest
  • Trough
The region in a sound wave where particles are under less pressure is called:
  • Rarefaction
  • Compression
  • Crest
  • Trough
Sound cannot travel through a vacuum because:
  • There are no particles to vibrate
  • It is too cold
  • There is no gravity
  • It is too dark
Human hearing range is approximately:
  • 2 Hz – 20 Hz
  • 20 Hz – 20,000 Hz
  • 20,000 Hz – 200,000 Hz
  • 200 Hz – 2,000 Hz
Frequency is measured in:
  • Metres
  • Hertz
  • Decibels
  • Seconds
Amplitude of a sound wave determines its:
  • Pitch
  • Loudness
  • Speed
  • Wavelength
The time taken for one complete wave cycle is called:
  • Frequency
  • Wavelength
  • Amplitude
  • Time period
Ultrasound refers to sound with a frequency:
  • Below 20 Hz
  • Between 20 Hz and 20,000 Hz
  • Above 20,000 Hz
  • Exactly 20,000 Hz
SONAR stands for:
  • Sound Navigation and Ranging
  • Sonic Navigation and Reflection
  • Sound Natural Radiation
  • Sonic Natural Ranging
In medical imaging, ultrasound waves are reflected from:
  • Only solid surfaces
  • Boundaries between different tissues
  • Only bones
  • Only fluids
Which of the following is NOT a use of ultrasound?
  • Cleaning delicate items
  • Medical scans
  • Communication in space
  • Flaw detection in materials
The wavelength is the distance between:
  • Two compressions
  • Two rarefactions
  • Two identical points on a wave
  • Amplitude and trough
If the wave speed remains constant, If frequency increases, wavelength:
  • Increases
  • Decreases
  • Stays the same
  • Doubles
The speed of sound in air is approximately:
  • m/s
  • 340 m/s
  • 1500 m/s
  • 5000 m/s
An echo is caused by:
  • Refraction of sound
  • Absorption of sound
  • Reflection of sound
  • Diffraction of sound
In the wave equation , what do f, λ, and v represent?
  • f = frequency, λ = wavelength, v = velocity (speed)
  • f = force, λ = length, v = volume
  • f = frequency, λ = amplitude, v = vibration
  • f = friction, λ = wavelength, v = velocity
0 h : 0 m : 1 s

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