JEE Main & Advanced Physics Simple Harmonic Motion Question Bank Assertion and Reason

  • question_answer
    Assertion             :       The amplitude of an oscillating pendulum decreases gradually with time Reason                 :       The frequency of the pendulum decreases with time             [AIIMS 2003]

    A)             If both assertion and reason are true and the reason is the correct explanation of the assertion.

    B)             If both assertion and reason are true but reason is not the correct explanation of the assertion.

    C)             If assertion is true but reason is false.

    D)             If the assertion and reason both are false.

    E)             If assertion is false but reason is true.

    Correct Answer: C

    Solution :

                The amplitude of an oscillating pendulum decreases with time because of friction due to air. Frequency of pendulum is independent \[\left( T=\frac{1}{2\pi }\sqrt{\frac{g}{l}} \right)\] of amplitude.


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