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NEET Sample Paper NEET Sample Test Paper-68

  • question_answer
    A rectangular block of size \[10 cm \times  8 cm \times  5 cm\] is kept in three different positions P, Q and R in turn as shown in the figure. In each case, the shaded area is rigidly fixed and a definite force F is applied tangentially to the opposite face to deform the block. The displacement of the upper face will be  

    A) same in all the three cases

    B) maximum in P position

    C) maximum in Q position

    D) maximum in R position

    Correct Answer: D

    Solution :

    \[\eta =\frac{F/A}{x/L}\,\,\,\Rightarrow \,\,x\,=\,\,\frac{L}{\eta }\,\,\times \,\,\frac{F}{A}\] If \[\eta \] and F are constant then \[x\propto \frac{L}{A}\] For maximum displacement area at which force applied should be minimum and vertical side should be maximum, this is given in the R position of rectangular block.


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