Class VII

Another example of wind instrument is
  1. guitar
  2. piano
  3. violin
  4. trombone
If frequency is high, peaks of waves would be
  1. uneven
  2. closer
  3. distant
  4. far apart
A strong beam of ultrasound can even melt a
  1. glass
  2. metal
  3. soap
  4. wax
. Loudness of sound is also known as
  1. Amplitude
  2. Wave front
  3. Volume
  4. Space of sound
Compared to drum, vibrations of whistle are
  1. less
  2. more
  3. same
  4. may be less or more
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