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

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

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Machine Design
Spring stiffness is

Load required to produce unit deflection
Its ability to absorb shocks
Its capability of storing energy
Ratio of coil diameter to wire diameter

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Machine Design
In worm, gears, pitch lead angle is

The angle between the tangent to the pitch helix and the plane of rotation
Half the angle between two inclined faces in axial plane
None of these
The angle between the tangent to the pitch helix and an element of the cylinder

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