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  5. Time and Motion

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

  • question_answer
    A spin drier spins at a rate of 600 revolutions per minute. How many revolutions would it make in 1 minute 20 seconds?

    A)  600                                       

    B)  800                       

    C)  900                       

    D)         1000

    Correct Answer: B

    Solution :

    Number of revolutions, the spin drier makes in 60 seconds = 600 revolutions. Number of revolutions, the drier will make in 80 seconds i.e., 1 minute 20 second \[=\frac{600}{60}\times 80=800\,\]revolutions.


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