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Class 7 Science MCQ App Download | Waves of Energy MCQ Apps (Android & iOS)

Class 7 Science MCQ: Complete Course

Waves of Energy MCQ App Download & PDF e-Book | 1719

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MCQ: 1719

When sound travels, the air molecules vibrate

  1. parallel to the sound direction
  2. perpendicular to the sound direction
  3. opposite to the sound direction
  4. in the direction of the sound
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Waves of Energy Study App: Free iOS & Android Apps

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