DUMET Medical DUMET Medical Solved Paper-2003

  • question_answer
    A semiconductor is cooled from \[{{T}_{1}}\] Kelvin to \[{{T}_{2}}\] Kelvin, then its resistance :

    A)  will not change

    B)  will increase

    C)  will decrease

    D)  none of these

    Correct Answer: B

    Solution :

     The electrical conductivity of semiconductors is intermediate between conductors and insulators. The temperature coefficient of resistance of semiconductors is negative, that is their electrical resistance increases (or conductivity decreases) with fall in temperature and vice-versa. Note: At absolute zero, a semiconductor becomes an ideal insulator.


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