Material property: definition of hardness (ability to resist indentation/scratch) Select the option that correctly captures the essence of hardness as a mechanical property. Choose the correct statement.
Mechanical Engineering
Engineering Materials
Difficulty: Easy
Choose an option
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AIt can be drawn into wires
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BIt breaks with little permanent distortion
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CIt can cut (scratch/indent) another metal
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DIt can be rolled or hammered into thin sheets
Answer
Correct Answer: It can cut (scratch/indent) another metal
Explanation
ConceptHardness is the resistance to localized plastic deformation (indentation/scratch). A harder material can scratch or indent a softer one.
Eliminate options
- (a) Ductility (wire drawing).
- (b) Brittleness (tendency to fracture).
- (d) Malleability (sheet forming).
Final AnswerIt can cut (scratch/indent) another metal