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

  • question_answer
    Nicrome wire is used as a heating element in many- appliance because:

    A)  It can be drawn out into wires easily

    B)  It has high resistivity

    C)  It resists oxidation in air when red hot

    D)  Both b and c are correct

    Correct Answer: D

    Solution :

    [d] Most heating elements use Nichrome 80/20 (80% nickel, 20% chromium) wire, ribbon, or strip. Nichrome 80/20 is an ideal material, because it has relatively high resistance and forms an adherent layer of chromium oxide when it is heated for the first time. Material beneath this layer will not oxidize, preventing the wire from breaking or burning out.

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