Class VII

Ships send a small
  1. pulse to the sea bed
  2. vibration to the tower
  3. piece of food to the fish
  4. beam of sound to check the depth
When sound travels, air molecules vibrate
  1. perpendicular to the sound direction
  2. opposite to the sound direction
  3. in the direction of the sound
  4. perpendicular to the sound direction
Pitch of note depends upon the
  1. tension on string
  2. diameter of wind hole
  3. tension on the drum surface
  4. diameter of the drum surface
If frequency is high, peaks of waves would be
  1. uneven
  2. closer
  3. distant
  4. far apart
When hand bell stimulates air particles
  1. temperature increase
  2. pressure increases and decreases in air
  3. temperature increases and decreases in air
  4. humidity of air keeps on increasing and decreasing
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