Class VIII

Sound travels at speed of 1482m/s in
  1. air
  2. water
  3. steel
  4. water
Wavelength of high frequency sound wave is
  1. longer
  2. shorter
  3. same
  4. constant
Loudness is measured by
  1. spectrometer
  2. thermostat
  3. thermometer
  4. sound level meter
. Brain interprets vibrations and electrical signals as
  1. sounds
  2. actions
  3. reactions
  4. movements
A pitch of sound can be change by changing
  1. string
  2. instrument
  3. tension
  4. temperature
Time Elapsed

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