Class VIII

He symbol of decibel is
  1. Dc
  2. dB
  3. Dec
  4. dl
Number of vibrations in a second is called
  1. pitch
  2. frequency
  3. amplitude
  4. infrasound
Sound having frequencies above 20000Hz are called
  1. infrasound
  2. ultrasound
  3. mega sound
  4. micro sound
A distinctive quality of a sound which depends on frequency of sound is called a
  1. pitch
  2. frequency
  3. ultrasound
  4. infrasound
Distance from one crest to another or one to another wave is called a
  1. wavelength
  2. frequency
  3. amplitude
  4. all of them
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