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NEET Sample Paper NEET Sample Test Paper-4

  • question_answer
    Two rods of equal length and area of cross-section are kept parallel and logged between temperature \[{{20}^{o}}C\] and \[{{80}^{o}}C\] The ratio of the effective thermal conductivity to that of the first rod is [The ratio \[{{K}_{1}}/{{K}_{2}}=3:4\]]

    A)  \[7:4\]                         

    B)  \[7:6\]

    C)  \[4:7\]                         

    D)  \[7:8\]

    Correct Answer: B

    Solution :

    For parallel combination of two rods of equal length and equal area of cross-section. \[K=\frac{{{K}_{1}}+{{K}_{2}}}{2}=\frac{{{K}_{1}}+\frac{4{{K}_{1}}}{3}}{2}\] \[=\frac{7{{K}_{1}}}{6}\] (given,  \[{{K}_{1}}/{{K}_{2}}=3/4\]) Hence, \[\frac{K}{{{K}_{1}}}=\frac{7}{6}\]


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