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      Question

      Ball pen functions on the principle of

      :
      A Viscosity Correct Answer Incorrect Answer
      B Boyle's Law Correct Answer Incorrect Answer
      C Gravitational force Correct Answer Incorrect Answer
      D Surface tension Correct Answer Incorrect Answer

      Solution

      The ballpoint pen is one of the most simple and yet ubiquitous devices whose function depends on surface tension. With a pen held upright, gravity and surface tension act in concert to get ink onto the ball.

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