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Haryana PMT Haryana PMT Solved Paper-2005

  • question_answer
    The bob of a simple pendulum is a hollow spherical ball filled with water. If a small hole is made in its bottom, then the time period of pendulum will :     

    A)  decrease                           

    B)  increase

    C)  remain same

    D)  first increase then decrease

    Correct Answer: D

    Solution :

                    As soon as water come out from the bottom the centre of gravity shifted downwards from the centre of ball so, the effective length of pendulum. increases. Hence, the time period also increases. When the ball becomes empty more than half, the C.G of pendulum rises up so, the effective length of pendulum decreases. Hence, time period also decreases.


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