Class VIII

Sound travels at speed of 1482m/s in
  1. air
  2. water
  3. steel
  4. water
Distance from one crest to another or one to another wave is called a
  1. wavelength
  2. frequency
  3. amplitude
  4. all of them
A form of energy which is produced by vibrations and can be detected by ears is called
  1. sound
  2. waves
  3. heat
  4. electric current
Humans can hear sound with in range
  1. 20Hz - 20000Hz
  2. 10Hz-10000Hz
  3. 200Hz-20000Hz
  4. 30Hz--30000Hz
Chain of tiny bones in ear includes
  1. hammer
  2. anvil
  3. stirrup
  4. all of them
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