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      Question

      Which principle allows chalk to write on a

      blackboard?
      A Adhesion Correct Answer Incorrect Answer
      B Cohesion Correct Answer Incorrect Answer
      C Viscosity Correct Answer Incorrect Answer
      D Gravity Correct Answer Incorrect Answer

      Solution

      Adhesion refers to the ability of different substances to stick together. When writing with chalk on a blackboard, the small particles of chalk adhere to the rough surface of the board, allowing visible marks to be made.

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