SSC MTS EXAM

Detailed explanation-1: -Physical properties include color, density, hardness, and melting and boiling points.

Detailed explanation-2: -Hardness is the property of a material that allows it to resist permanent distortion, penetration, indentation, and scratching. Therefore, hardness is important from an engineering point of view because resistance to wear by either friction or erosion from steam, oil, and water generally increases with hardness.