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Railways R.R.C. (Chennai) Solved Paper Held on 1st Shift 2-11-2014

  • question_answer
    The hardest substance known is?

    A) Diamond                      

    B) Steel

    C) Platinum                       

    D) Tungsten

    Correct Answer: A

    Solution :

    Diamond is regarded to be the hardest known material in the world.


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