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Shear stress distribution in a rectangular beam is: 
APARABOLIC — zero at top and bottom, maximum at neutral axis
BUniform
CLinear
DRandom
Answer & Solution
Correct answer: A. PARABOLIC — zero at top and bottom, maximum at neutral axis
For rectangular beam under transverse shear V: shear stress τ = V × Q/(I × b), where Q = first moment of area above (or below) the level. Result is parabolic, max at NA = 1.5 × (V/A) = 1.5 × avg. Zero at top and bottom (no material above/below extreme fibres).
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