Structural Analysis
Castigliano’s first theorem is applicable

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

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Structural Analysis
When a uniformly distributed load, shorter than the span of the girder, moves from left to right, then the conditions for maximum bending moment at a section is that

the load position should be such that the section divides it equally on both sides
the head of the load reaches the section
the tail of the load reaches the section
the load position should be such that the section divides the load in the same ratio as it divides the span

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