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  3. JAMIA MILLIA ISLAMIA

JAMIA MILLIA ISLAMIA Jamia Millia Islamia Solved Paper-2009

  • question_answer
        If we add impurity to a metal those atoms also deflect electrons. Therefore,

    A)  the electrical and thermal conductivity both increase

    B)  the electrical and thermal conductivity both decrease

    C)  the electrical conductivity increases but thermal conductivity decreases

    D)  the electrical conductivity decreases but thermal conductivity increases

    Correct Answer: B

    Solution :

                    As the number of electrons increase, their number of collisions, increasing the thermal and electrical resistance. Hence, electrical and thermal conductivity, both decrease.


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