UPSC General Studies Solved Paper - General Studies-2015

  • question_answer
    With reference to 'fly ash' produced by the power plants using coal as fuel, which of the following statement(s) is/are correct?
    1. Fly ash can be used m the production of bricks for building construction.
    2. Fly ash can be used as a replacement for some of the Portland cement contents of concrete.
    3. Fly ash is made up of silicon dioxide and calcium oxide only, and does not contain any toxic elements.
    Select the correct answer using the codes given below.

    A)  1 and 2

    B)  Only 2

    C)  1 and 3           

    D)  Only 3

    Correct Answer: A

    Solution :

    Exp. [a] Fly ash is produced whenever combustion of solid material takes place. Fly ash is one such residue which rises with gases into the atmosphere. The ash which does not rise is termed as bottom ash. Fly ash can be used in the production of bricks for construction of building and roads. Fly ash can be used as a replacement of cement and is used in concrete roads. Fly ash composition are as follow
    (i) Aluminium silicate (in large amounts)
    (ii) Silicon dioxide
    (iii) Calcium oxide
    Hence, option [a] is correct.

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