JCECE Engineering JCECE Engineering Solved Paper-2011

  • question_answer
    The dimension of \[\frac{p}{a}\] in the equation\[p=\frac{b-{{t}^{2}}}{ax}\] where \[p\] is pressure, \[x\] is distance and \[t\] is time are

    A) \[[ML{{T}^{-2}}]\]                           

    B) \[[M{{T}^{-2}}]\]

    C) \[[M{{L}^{3}}{{T}^{-2}}]\]                            

    D)  \[[L{{T}^{-3}}]\]

    Correct Answer: B

    Solution :

    \[p=\frac{b-{{t}^{2}}}{ax}\] or            \[pax=b-{{t}^{2}}\]                 \[[pax]=[b][{{T}^{2}}]\]                 \[[a]=\frac{[{{T}^{2}}]}{[p][x]}\]                 \[=\frac{[{{T}^{2}}]}{[M{{L}^{-1}}{{T}^{-2}}][L]}\]                 \[[a]=[{{M}^{-1}}{{T}^{4}}]\]                 \[\left[ \frac{b}{a} \right]=\frac{[{{T}^{2}}]}{[{{M}^{-1}}{{T}^{4}}]}=[M{{T}^{-2}}]\]


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