Discussion
Assertion (A): Standard consistency is determined before the setting time test is carried out.
Reason (R): Setting time depends on the water content, so a reference stiffness must be fixed first.
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 why the order is fixed. A wetter paste sets later and a drier one sooner, so a setting time is meaningless unless the water content is standardised first. Standard consistency - the water percentage at which the Vicat plunger penetrates to a specified depth - establishes that reference, and the setting time and soundness tests are then run at a fixed fraction of it.
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