Class VII

Sounds of thunder and lorries are known as
  1. loud sounds
  2. soft sounds
  3. high pitched sounds
  4. low pitched sounds
Percussion instruments produce notes when they are
  1. struck
  2. banged
  3. blown
  4. shaken
Most of sounds around world are
  1. artificial
  2. natural
  3. man-made
  4. electronic made
Sound is made louder by increasing
  1. wavelength
  2. frequency
  3. wave front
  4. amplitude
Compared to drum, vibrations of whistle are
  1. less
  2. more
  3. same
  4. may be less or more
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