UPSC Physics Electric Current and Magnetism Question Bank Electricity, Magnetism and Light

  • question_answer
    Consider the following statements:
    An ordinary light bulb has a rather short life because the:                             [IAS Prelim]
    1. filament wire is not uniform.
    2. bulb cannot be evacuated completely.
    3. wires supporting the filament melt at high temperatures.
    Which of the above statements are correct?

    A) 1 and 3            

    B)      2 and 3

    C) 1 and 2            

    D)      1, 2 and 3

    Correct Answer: D

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