SSC General Science & Technology Sample Paper NCERT Sample Paper-2

  • question_answer
    Air from an electric bulb is removed because in its presence

    A)  The filament cannot glow properly

    B)  Oxygen would bum the filament by combustion

    C)  The filament would get rusty

    D)  The filament would combine with nitrogen of the air

    Correct Answer: B

    Solution :

    [b] An incandescent light bulb contains a thin wire filament (usually tungsten) that glows hot when an electric current is run through it. In the presence of oxygen, the filament would burn up as a result of the high temperature. A glass bulb, then, is used to keep oxygen away from the filament. While a vacuum will work, any inert gas that inhibits combustion will also work. Since the vacuum of space would have no oxygen, a bare filament WOULD work as a light bulb without the glass globe.

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