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UPSC Physics Fluid Mechanics, Surface Tension & Viscosity / द्रव यांत्रिकी, भूतल तनाव और चिपचिपापन Question Bank Force of Gravity, Solids and Fluids

  • question_answer
          Which type/types of pen uses/use capillary action in addition to gravity for flow of ink?                                    [CDS]

    A) Fountain pen

    B) Ballpoint pen

    C) Gel pen

    D) Both ballpoint and gel pens

    Correct Answer: A

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