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  3. NEET

NEET AIPMT SOLVED PAPER 1999

  • question_answer
                    The resistance of a discharge tube is:                                                                                                     

    A)                 zero   

    B)                 ohmic   

    C)                 non-ohmic

    D)                 infinity

    Correct Answer: C

    Solution :

                    In discharge tube, the current is due to flow of positive ions and electrons. Moreover secondary emission of electrons is also possible. So, V-I curve is non-linear, hence its resistance is non-ohmic.


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