Which one of the following is not a mechanical property of a metal?  

This question was previously asked in
ISRO VSSC Technician-B (Fitter) Official Paper (Held On: 14 July 2021)
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  1. Corrosion resistance
  2. Strength
  3. Hardness
  4. %Elongation

Answer (Detailed Solution Below)

Option 1 : Corrosion resistance
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Detailed Solution

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Explanation:

Corrosion resistance:

  • Corrosion resistance is the capacity to hold the binding energy of a metal and withstand the deterioration and chemical breakdown that would otherwise occur when the material is exposed to such an environment.
  • It is not a mechanical property of a metal.

Mechanical properties:
The mechanical properties of a metal are:

  • ductility
  • malleability
  • hardness
  • brittleness
  • toughness
  • tenacity
  • elasticity

Hardness:

  • Hardness is a measure of a metal's ability to withstand scratching, wear, abrasion, and penetration.

Strength:

  • Strength is a metal's resistance to non-recoverable deformation, otherwise called plastic deformation.
  • Toughness, on the other hand, is how well a metal can resist fracture.
  • Toughness is, therefore, measured as the energy needed to cause a fracture on a metal.

Elongation:

  • A mechanical property of a metal that is the degree to which a material may be bent, stretched, or compressed before it ruptures.
  • It is a point between tensile strength and yield strength and is expressed as a percentage of the original length.
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