Machine Design
An elastic bar is fixed at the upper end and loaded at the lower end by a falling weight. The shock load produced can be reduced by

Decreasing the modulus of elasticity of the bar
All of these
Decreasing the cross-sectional area of the bar
Increasing the length of bar

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

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

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