Machine Design
The plasticity is the property of a material which enables it to

Retain deformation produced under load permanently
Regain its original shape after deformation when the external forces are removed
Draw into wires by the application of a tensile force
Resist fracture due to high impact loads

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Machine Design
Stress concentration is caused due to

All of these
Pitting at points or areas at which loads on a member are applied
Variation in properties of material from point to point in a member
Abrupt change of section

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