Discussion
Assertion (A): Cement strength tests specify the sand as closely as they specify the cement.
Reason (R): Any variation in the aggregate would appear in the result as if it were a variation in the cement.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason is the logic of the whole test. Mortar strength depends on the aggregate as well as the binder, so an unspecified sand would introduce a variable indistinguishable from the one being measured. Specifying the sand as tightly as the cement is what makes the result comparable between laboratories and between years.
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