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10th Class Mathematics Areas Related to Circles Question Bank MCQs - Areas Related to Circles

  • question_answer
    The diameter of the wheel of a bus is\[\text{1}.\text{4 m}\]. The wheel makes 10 revolutions in 5 seconds. The speed of the vehicle (in kmph) is:

    A) 30

    B) 31

    C) \[\text{31}.\text{68}\]

    D) 35

    Correct Answer: C

    Solution :

    [c] Circumference of the wheel \[=\pi \times 1.4\,m\]
    \[=\frac{22}{7}\times 1.4=4.4\,m\]
    \[\therefore \] Distance covered in 10 revolutions
    \[=10\times 4.4\,m=44\,m\]
    \[\therefore \]  Speed \[=\frac{44}{5}m/s.=\frac{44}{5}\times \frac{18}{5}=31.68km/h\]


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