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

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

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Machine Design
A bolt

Has both the ends threaded
Is provided with pointed threads
Has head at one end and other end fits into a tapped hole in the other part to be joined
Has a head on one end and a nut fitted to the other

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Machine Design
Slenderness ratio is the ratio of

Width of column to depth of column
Effective length of column to least radius of gyration of the column
Effective length of column to width of column
Maximum size of column to minimum size of column

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