JAMIA MILLIA ISLAMIA Jamia Millia Islamia Solved Paper-2014

  • 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) increases its electrical conductivity

    D) increases 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 electron/ holes drastically increases, hence increasing its electrical conductivity.


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