Discussion
Assertion (A): Extruded ceramic products sometimes split along curved surfaces during firing.
Reason (R): The auger imposes a helical flow whose interfaces never knit together completely.
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. The helical flow leaves interfaces spiralling through the piece, and where the two surfaces have not fully bonded the piece is weak along them. Firing shrinkage then opens those surfaces, so the split follows a curved path that records the auger’s motion.
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