Class VII

Compared to air, sounds travel faster in
  1. liquids
  2. gases
  3. vacuum
  4. fluids
Bats also use ultrasound to prevent
  1. predators
  2. homes
  3. preys
  4. obstacles
Longer name for ultrasounds is
  1. ultrahigh sounds
  2. ultra-pitch sounds
  3. ultrasonic sounds
  4. ultraviolet sounds
Higher frequency, more the
  1. note of sound
  2. depth of sound
  3. depth of sound
  4. wavelength of sound
Sound travels fastest in solids because the
  1. particles vibrate more vigorously
  2. particles move faster
  3. collision of particles is greater
  4. particles are closely packed
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