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NEET AIPMT SOLVED PAPER MAINS 2011

  • question_answer
    A thermocouple of negligible resistance, produces an emf of \[\text{40 }\!\!\mu\!\!\text{ V}{{\text{/}}^{\text{o}}}\text{C}\]in the linear range of temperature. A galvanometer of resistance \[10\,\Omega \]whose sensitivity is\[\text{1 }\!\!\mu\!\!\text{ A/div}\], is employed with the thermocouple. The smallest value of temperature difference that can be detected by the system will be

    A)  \[{{0.5}^{o}}C\]

    B)  \[{{1}^{o}}C\]

    C)  \[{{0.1}^{o}}C\]

    D)  \[{{0.25}^{o}}C\]

    Correct Answer: D

    Solution :

    For minimum deflection of 1 division require current \[=1\mu A\] voltage required \[=iR=1\times 10=10\mu V\] \[\therefore \]  \[40\mu V\cong {{1}^{o}}C\]                 \[10\mu V\cong {{\frac{1}{4}}^{o}}C\]                           \[={{0.25}^{o}}C\]


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