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Assertion (A): For an unsymmetric section the maximum stress need not occur at the topmost fibre.

Reason (R): The neutral axis of such a section is inclined to the horizontal.

Select the correct answer from the options below.

  • A.Both A and R are true, but R is not the correct explanation of A
  • B.A is true but R is false
  • C.A is false but R is true
  • D.Both A and R are true, and R is the correct explanation of A

Answer: D

Both statements are true and the second is the reason for the first. The critical point is whichever lies furthest from the inclined neutral axis, and that may well be a side corner rather than the top or bottom of the section.

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