Class VII

Another example of wind instrument is
  1. guitar
  2. piano
  3. violin
  4. trombone
Some fishing boats use echoes to
  1. calculate the depth of water
  2. detect shoals of fish
  3. detect any predator
  4. fish eggs
Human organs that detect sound are
  1. eyes
  2. ears
  3. nose
  4. tongue
Compared to drum, vibrations of whistle are
  1. less
  2. more
  3. same
  4. may be less or more
Most of sounds around world are
  1. artificial
  2. natural
  3. man-made
  4. electronic made
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