Correct option is A
Vicat's apparatus is primarily used to determine the standard consistency of cement.
Standard consistency is the amount of water required to make a cement paste of such consistency that the Vicat plunger penetrates to a specified depth (33-35 mm) in a cement paste under standard conditions.
Purpose of Consistency Test:
The consistency test ensures the correct amount of water is added to the cement for subsequent tests such as setting time, soundness, and strength tests.
