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SSC Sample Paper SSC (Group-C) Sample Test Paper-1

  • question_answer
    If the radius of the base, and the height of a right circular cone are increased by 20%, what is the approximate percentage increase in volume?

    A)  60               

    B)  68.8

    C)  72.8                

    D)  75

    Correct Answer: C

    Solution :

     Volume of cone\[=\frac{1}{3}\pi {{r}^{2}}h\] Single equivalent increase in radius \[=\left( 20+20+\frac{20\times 20}{100} \right)%=44%\] Single equivalent percentage effect for 44% and 20% \[=\left( 44+20+\frac{44\times 20}{100} \right)%\] = (64 + 8.8)% = 72.8% = Increase in volume


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