Discussion
Assertion (A): An I-section has a smaller shape factor than a rectangle.
Reason (R): Most of an I-section's material already lies near the extreme fibres.
Select the correct answer from the options below.
Answer: D
Both statements are true and the second explains the first. Since the flanges are already close to fully stressed when the extreme fibre yields, little extra capacity remains to be unlocked by full plasticity, so the plastic and elastic moduli are close together.
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