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SSC Sample Paper Mock Test-19 SSC CGL Tear-II Paper-1

  • question_answer
    The ratio of total surface area to the lateral surface area of a cylinder with base radius 70 cm and height 30 cm is

    A) 2 : 7     

    B)  7 : 3

    C)  10 : 3

    D)  3 : 10

    Correct Answer: C

    Solution :

    \[\frac{\text{Total}\,\,\text{surface}\,\,\text{area}}{\text{Curved}\,\,\text{surface}\,\,\text{area}}=\frac{2\pi r\,\,(h+r)}{2\pi rh}=\frac{h+r}{h}\] \[\therefore \]\[\frac{\text{Total}\,\,\text{surface}\,\,\text{area}}{\text{Curved}\,\,\text{surface}\,\,\text{area}}=\left( \frac{h+r}{h} \right)=\left( \frac{30+70}{30} \right)=\frac{10}{3}\]


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