Structural Analysis
Castigliano’s first theorem is applicable

only when principle of superposition is valid
when the system behaves elastically
for statically determinate structures only
None of these

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Structural Analysis
Pick up the incorrect statement from the following:

None of these
The gross section of the web of channels is the depth of the web multiplied by its thickness
The gross section of the web of rolled I-beams is the depth of the beam multiplied by the web thickness
The gross section of the web of plate girders is the depth of the web plate multiplied by its thickness

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