NEET Physics Mathematical Tools, Units & Dimensions Question Bank Dimensions

  • question_answer
    The velocity of a freely falling body changes as \[{{g}^{p}}{{h}^{q}}\] where g is acceleration due to gravity and \[h\] is the height. The values of \[p\] and \[q\] are            [NCERT 1983; EAMCET 1994]

    A)    \[1,\frac{1}{2}\]      

    B)     \[{{M}^{0}}{{L}^{2}}{{T}^{-2}}\]

    C)      \[\frac{1}{2},\,1\]  

    D)             \[1,\,1\]

    Correct Answer: B

    Solution :

                    \[v\propto {{g}^{p}}{{h}^{q}}\] (given)             By substituting the dimension of each quantity and comparing the powers in both sides we get \[[L{{T}^{-1}}]={{[L{{T}^{-2}}]}^{p}}{{[L]}^{q}}\]             \[\Rightarrow \] \[p+q=1,\,\,-2p=-1,\,\therefore \,\,p=\frac{1}{2},\,q=\frac{1}{2}\]


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