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Railways General Science & Technology Alternating Current / प्रत्यावर्ती धारा Sample Paper Alternating Current and Electromagnetic Induction Sample Test Paper-10

  • question_answer
    A bulb is connected first with DC and then AC of same voltage it will shine brightly with

    A)  AC

    B)  DC

    C)  Brightness will be in ratio 1/1.4

    D)  Equally with both

    Correct Answer: D

    Solution :

    [d] \[Brightness\,\,\propto \,\,{{P}_{consumed}}\,\propto \,\frac{1}{R}.\] For bulb, \[{{R}_{ac}}={{R}_{dc}},\] so brightness will be equal in both the cases.


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