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SSC Sample Paper SSC CGL - Sample Paper-21

  • question_answer
    The volume of a cube is \[512\,\,c{{m}^{3}}.\] Its surface area (in sq cm) is

    A) 284                              

    B) 384

    C) 484                              

    D) 576

    Correct Answer: B

    Solution :

    Let a be the side of the cube. \[\therefore \]      \[{{a}^{3}}=512\] \[\Rightarrow \]   \[{{a}^{3}}={{8}^{3}}\] \[\Rightarrow \] \[a=8\,cm\] \[\therefore \] Surface area of the cube \[=6{{a}^{2}}\]             \[=6\times {{8}^{2}}\]             \[=6\times 64\]             \[=384\,c{{m}^{2}}\]


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