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NEET Sample Paper NEET Sample Test Paper-68

  • question_answer
    The thermal conductivity of a material in CGS 4 system is 0.4. In steady state, the rate of flow of heat is \[10\text{ }cal/sec-c{{m}^{2}}\], then the thermal gradient will be

    A) \[10{}^\circ \,C/cm\]                 

    B) \[12{}^\circ C/cm\]

    C) \[25{}^\circ C/cm~\]                

    D) \[20{}^\circ C/cm\]

    Correct Answer: C

    Solution :

    \[\frac{\Delta Q}{\Delta t}=\frac{KA\,\Delta \theta }{\Delta x}\,\,\,\Rightarrow \,\,Thermal\,\,gradient\,\,\frac{\Delta \theta }{\Delta x}\] \[=\,\,\frac{(\Delta Q/\Delta t)}{K}\,\,=\,\,\frac{10}{0.4}\,\,=\,25{}^\circ \,C/cm\]


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