Correct option is B
Hardness is the property of a material that enables it to resist wear, abrasion, scratching, and penetration. It is a critical attribute in determining the suitability of a material for tools, wear-resistant parts, and structural applications. The maximum hardness of steel is a function of its carbon content. Hardness increases as the percentage of carbon increases.
Methods of Measuring Hardness:
Brinell Hardness Test (BHN): Measures indentation hardness using a steel ball.
Vickers Hardness Test (VHN): Uses a diamond-shaped indenter for smaller-scale applications.
Rockwell Hardness Test: Measures depth of penetration under load.
Mohs Hardness Scale: Qualitative scale from 1 (talc) to 10 (diamond).
