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Railways R.R.C. (Gorakhpur) Solved Paper Held on 1st Shift 23-11-2014

  • question_answer
    Which type of rocks is generally considered the hardest?

    A) Igneous

    B) Sedimentary

    C) Metamorphic

    D) One having maximum manganese content

    Correct Answer: C

    Solution :

    Diamond (Metamorphic Rock) is hardest rock.


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