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VMMC VMMC Medical Solved Paper-2005

  • 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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