Uttarakhand PMT Uttarakhand PMT Solved Paper-2009

  • question_answer
    Suitable impurities are added to a semiconductor depending on its use. This is done to

    A)  increase its life

    B)  enable it to withstand high voltage

    C)  increase its electrical conductivity

    D)  increase its electrical resistivity

    Correct Answer: C

    Solution :

     When pure semiconductor material is mixed with small amount of certain specific impurities with valency different from that of the parent material, the number of mobile electrons/holes drastically increases; hence increasing its electrical conductivity.


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