Class VIII

Sound having frequencies above 20000Hz are called
  1. infrasound
  2. ultrasound
  3. mega sound
If we tighten strings of instrument pitch will be
  1. higher
  2. lower
  3. constant
  4. no pitch
Number of vibrations in a second is called
  1. pitch
  2. frequency
  3. amplitude
  4. infrasound
Louder sound can cause damage to
  1. hearing
  2. sight
  3. skin
  4. brain
Higher frequency greater will be
  1. pitch
  2. loudness
  3. amplitude
  4. infrasound
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