Question:
Which of the following is the surface defect?
Which of the following is the surface defect?
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Remember: Point = Vacancy; Line = Dislocation; Surface = Grain Boundary/Crack.
Updated On: Jul 4, 2026
- Cracks
- Vacancy
- Screw dislocation
- Edge dislocation
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The Correct Option is A
Solution and Explanation
Step 1: Concept Crystal defects are classified by their dimensionality: point (0D), linear (1D), surface/interfacial (2D), and bulk (3D).
Step 2: Meaning Surface defects are boundaries that separate regions of the material, which can be external or internal interfaces.
Step 3: Analysis Vacancies are point defects. Screw and edge dislocations are linear defects. Cracks are macroscopic or microscopic interruptions on the surface or interface, categorized as surface or volume defects.
Step 4: Conclusion Among the choices, cracks represent a surface-related defect that disrupts the continuity of the material surface. Final Answer: (A)
Step 2: Meaning Surface defects are boundaries that separate regions of the material, which can be external or internal interfaces.
Step 3: Analysis Vacancies are point defects. Screw and edge dislocations are linear defects. Cracks are macroscopic or microscopic interruptions on the surface or interface, categorized as surface or volume defects.
Step 4: Conclusion Among the choices, cracks represent a surface-related defect that disrupts the continuity of the material surface. Final Answer: (A)
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