Discussion
Assertion (A): A plaster mould must be dried between castings.
Reason (R): Water taken up during one cast must be removed before the mould can absorb more.
Answer: C
Both are true and the reason gives the necessity: a saturated mould draws water only slowly, so the cast builds unevenly and the production rate falls, which is why moulds are cycled through a drying room in a pottery.
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