SSC General Science & Technology Sample Paper NCERT Sample Paper-1

  • question_answer
    A common florescent tube contains:

    A)  Mercuric oxide and neon

    B)  Sodium vapour

    C)  Mercury vapour and an inert gas

    D)  Argon at low pressure

    Correct Answer: C

    Solution :

    [c] The central element in a fluorescent lamp is a sealed glass tube. The tube contains a small bit of mercury and an inert gas, typically argon, kept under very low pressure. The tube also contains a phosphor powder, coated along the inside of the glass. The tube has two electrodes, one at each end, which are wired to an electrical circuit.

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