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  3. 7th Class
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  5. Time and Motion

7th Class Science Time and Motion Question Bank Motion and Time

  • question_answer
    DIRECTIONS: On the basis of following diagram/ picture answer the questions given below: A pendulum swings backwards and forwards passing through Y, the middle point of the oscillation. The first time the pendulum passes through Y a stopwatch is started. The twenty-first time the pendulum passes through Y, the stopwatch is stopped. The reading is T. What is the period of the pendulum?

    A) T/40               

    B) T/20

    C) T/21               

    D) T/10

    Correct Answer: D

    Solution :

        The pendulum passes through Y twice every 1 complete oscillation. The pendulum passes through Y a total of 20 times during the time taken, therefore, it had completed 10 oscillations. To find the period, we take T/10.


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