Discussion
Assertion (A): Cement mills are controlled on fineness rather than on strength.
Reason (R): Strength results take days to obtain whereas fineness is available within minutes.
Answer: A
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. Strength is what the customer buys, but a 28-day result arrives four weeks after the cement was made and is useless for controlling the mill. Blaine is available in minutes and correlates well enough with strength to serve as the control variable, with strength testing confirming the relationship.
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