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Railways Sample Paper RRB (Group D) Sample Test Paper-7

  • question_answer
    The length (in meters) of the longest rod that can be put in a room of dimensions \[10\,\,m\times 10\,\,m\times 5\,\,m\,\,is\]

    A)  \[15\sqrt{3}\]

    B)  15

    C)  \[10\sqrt{2}\]               

    D)  \[5\sqrt{3}\]

    Correct Answer: B

    Solution :

    [b] Length of the longest rod \[\sqrt{{{a}^{2}}+{{b}^{2}}+{{c}^{2}}}\] \[=\sqrt{{{10}^{2}}+{{10}^{2}}+{{5}^{2}}}\] \[=\sqrt{255}=15\,\,metre\]


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