1.

Ordinary Portland cement (OPC) has been classified into how many grades?(a) 2(b) 3(c) 10(d) 5

Answer» Correct choice is (b) 3

For explanation: There was only one grade of OPC before 1987 and was according to IS 269-1976.  It was revised in 1991 and IS 1489-1991 included 3 grades namely, 33 grade, 43 grade and 53 grade.


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