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BVP Medical BVP Medical Solved Paper-2003

  • question_answer
    The ratio of thermal conductivity of two rods of different material is 5 : 4. The two rods of same area of cross-section and same thermal resistance will have the lengths in the ratio :

    A)  4 : 5                                      

    B)  9: 1

    C)  1 : 9                                      

    D)  5: 4

    Correct Answer: D

    Solution :

                    Using the relation \[\frac{{{K}_{1}}{{A}_{1}}}{{{d}_{1}}}=\frac{{{K}_{2}}{{A}_{2}}}{{{d}_{2}}}\]  (Here: \[{{A}_{1}}={{A}_{2}}\]) So,          \[\frac{{{d}_{1}}}{{{d}_{2}}}=\frac{{{K}_{1}}}{{{K}_{2}}}\frac{{{A}_{1}}}{{{A}_{2}}}=\frac{5}{4}\]


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