Structural Analysis
The principle of virtual work can be applied to elastic system by considering the virtual work of

External forces only
None of these
Internal forces only
Internal as well as external forces

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Structural Analysis
Pick up the correct statement applicable to cased columns.

Single I-beam or channels back with or without flange plates may be used
All of these
Single I-beam or channels back with or without flange plates may be used
The surface and edges of the steel column should be provided a concrete cover not less than 50 mm

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