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WB JEE Medical WB JEE Medical Solved Paper-2006

  • question_answer
    The temperature, at which centigrade and Fahrenheit scales give the same reading, is:

    A)  \[~-\,{{40}^{o}}\]                           

    B)  \[~{{40}^{o}}\]

    C)  \[~-\,{{30}^{o}}\]                           

    D)  \[~\,{{30}^{o}}\]

    Correct Answer: A

    Solution :

                     Let the common temperature is \[x\] on both scales. \[\frac{C}{5}=\frac{F-32}{9}\]                                     Put         \[C=F=x\]                 \[\therefore \]  \[\frac{x}{5}=\frac{x-32}{9}\]                 or            \[9x=5x-160\]                 or            \[4x=-160\]                 \[\therefore \]  \[x=-{{40}^{o}}\]


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