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What are one-dimensional defects?

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What are one-dimensional defects?

(a) Boundary defect

(b) Point defect

(c) Line defect

(d) Volume defect

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

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Right choice is (c) Line defect

The explanation is: When compared geometrically, line defects are seen as one-dimensional defects. Line defects are also known as dislocations, with common types as edge and screw dislocations.

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