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  1. Which of the following statements is/are true for a good conductor of electricity?

    1. Its conductivity decreases with increasing temperature.
    2. Number of free electrons is around 1028 m-3.
    3. Its conductivity decreases with addition of impurities.
    4. It is a good conductor of heat also.

    2. A.
    1, 2, 3 and 4
    B.
    1 only
    C.
    2 and 3 only
    D.
    3 and 4 only

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    Answer : Option A

    Explanation :

    No answer description available for this question.

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