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NEET Sample Paper NEET Sample Test Paper-71

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

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


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