New Enroll in RBI Grade B New Batch - Starts on May 21

    Question

    Tungsten is used for the manufacture of the filament of

    an electric bulb, because –
    A It is a good conductor Correct Answer Incorrect Answer
    B It is economical Correct Answer Incorrect Answer
    C It is malleable Correct Answer Incorrect Answer
    D It has a very high melting point Correct Answer Incorrect Answer

    Solution

    Tungsten is used because it has the highest melting point of all the metallic elements. It melts at 3410 degrees Celsius. When currentpassesthroughthefilamentitheatsitup. Whenthefilamentreachesacertaintemperature itstartstogiveofflight,that'showwegetalight bulb. The first successful light bulb filaments were made of carbon(fromcarbonizedpaper or bamboo).

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