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What are two-dimensional defects?

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What are two-dimensional defects?

(a) Boundary defect

(b) Point defect

(c) Line defect

(d) Volume defect

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This key question is from Crystal Defects in portion Imperfection in Metal Crystals, Fracture, Corrosion and Oxidation of Engineering Material & Metallurgy

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Correct choice is (a) Boundary defect

Explanation: The defects that occur on the surface of a material are known as surface or boundary defects. Geometrically, they are regarded as two-dimensional defects.

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