Class VII

In large empty rooms, even a click keeps on
  1. increasing
  2. decreasing
  3. repeating
  4. coming
Compared to drum, vibrations of whistle are
  1. less
  2. more
  3. same
  4. may be less or more
Unlike light, sounds cannot
  1. pass through transparent solids
  2. pass through air
  3. pass through liquids
  4. pass through vacuum
Musical instruments are designed so that they produce
  1. musical notes
  2. pitch
  3. rhythm
  4. musical beat
Sound waves are detected by
  1. speakers
  2. electronics
  3. microphones
  4. computers
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