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

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

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Structural Analysis
The minimum horizontal distance between two parallel main reinforcing bars, is

The diameter of the bar if their diameters are same
Greatest value of the above
The diameter of the longer bar if their diameters are unequal
5 mm more than nominal maximum size of the coarse aggregate

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