Class VII

An example of longitudinal waves is
  1. slinky spring
  2. light
  3. energy
  4. water waves
Sounds of birds and animals are
  1. artificial
  2. natural
  3. man-made
  4. electronic made
X-rays are only reflected from
  1. soft surfaces
  2. thin surfaces
  3. hard surfaces
  4. thick surfaces
Echoes are formed when sound
  1. strikes a wall and reflects back
  2. strikes a wall and is absorbed
  3. hits the eardrum and keeps on hitting
  4. is too loud
Most of sounds around world are
  1. artificial
  2. natural
  3. man-made
  4. electronic made
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