Discussion
Assertion (A): A ceramic design avoids abrupt changes of section wherever possible.
Reason (R): Thick and thin regions dry and shrink at different rates and the piece cracks between them.
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 mechanism. A thin section reaches the critical moisture content and finishes shrinking while the adjoining thick section is still contracting, so the two pull against each other and the piece cracks at the junction. Designing with gradual transitions, coring out thick regions and keeping wall thickness even are all responses to that single fact.
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