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NEET Sample Paper NEET Sample Test Paper-78

  • question_answer
    A uniform steel rod of \[2.5 m{{m}^{2}}\] cross-sectional area is heated through\[40{}^\circ C\]. The force exerted on it is \[({{\alpha }_{steel}}\,=\,\,1.2\times {{10}^{-\,5}}\,/{}^\circ C,\,\,y\,\,=\,\,2\times 1{{0}^{11}}\,N/{{m}^{2}})\]

    A)  480 N              

    B)  240 N                

    C)  140 N              

    D)  None of these

    Correct Answer: B

    Solution :

    Area, \[A=2.5\,\,m{{m}^{2}}\,=\,2.5\times {{10}^{-\,6}}\,{{m}^{2}}\] \[\Delta T=40{}^\circ C\] Now, force exerted on it is \[F=\alpha AY\left( \Delta T \right)\] \[=\,\,(1.2\times 1{{0}^{-\,5}})\times (2.5\times {{10}^{-\,6}})\times (2\times 1{{0}^{11}})\times 40\] \[=\,\,\,240\,N\]


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