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Railways R.R.C. (Kolkata) Solved Paper Held on 2nd Shift 9-11-2014

  • question_answer
    At temperature near zero Kelvin, metals such lead and tin become?

    A) insulators                      

    B) semiconductors

    C) superconductors 

    D) perfect conductor

    Correct Answer: C

    Solution :

    Near absolute zero, some metals display super- conductivity. During recent years, some materials have been developed that display superconductivity at room temperature.


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