Structural Analysis
For a symmetrical two hinged parabolic arch, if one of the supports settles horizontally, then the horizontal thrust

becomes zero
remains unchanged
is decreased
is increased

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

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