Structural Analysis
Principle of superposition is applicable when

None of these
The action of applied forces will be affected by small deformations of the structure
Deflections are linear functions of applied forces
Material obeys Hooke's law

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

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
Single I-beam or channels back with or without flange plates may be used

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