Class VIII

Regions where molecules spread out are called
  1. rarefactions
  2. compressions
  3. digressions
  4. progressions
Higher frequency greater will be
  1. pitch
  2. loudness
  3. amplitude
  4. infrasound
. Brain interprets vibrations and electrical signals as
  1. sounds
  2. actions
  3. reactions
  4. movements
Sound having frequencies above 20000Hz are called
  1. infrasound
  2. ultrasound
  3. mega sound
  4. micro sound
Unwanted sounds are called
  1. noises
  2. pleasant
  3. fruitful
  4. healthy
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