Discussion
Assertion (A): Increasing the fineness of a cement raises both its early strength and its water demand.
Reason (R): A greater surface area reacts faster but also needs more water to wet it.
Answer: D
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. Hydration begins at the surface, so more surface means faster reaction and higher early strength. But every particle must be wetted before it can react, and more surface needs more water to wet it - which raises the water demand and, at a fixed workability, works against the strength that the fineness was meant to gain.
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