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

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

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Structural Analysis
Pick up the incorrect statement from the following:

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

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