Theory of Structures
A steel bar 5 m × 50 mm is loaded with 250,000 N. If the modulus of elasticity of the material is 0.2 MN/mm² and Poisson’s ratio is 0.25, the change in the volume of the bar is:

2.125 cm³
4.125 cm²
3.125 cm³
1.125 cm³

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Theory of Structures
A compound bar consists of two bars of equal length. Steel bar cross -section is 3500 mm²and that of brass bar is 3000 mm². These are subjected to a compressive load 100,000 N. If Eb = 0.2 MN/mm² and Eb = 0.1 MN/mm², the stresses developed are:

b = 10 N/mm² s = 20 N/mm 2
b = 8 N/mm² s = 16 N/mm²
b = 5 N/mm² s = 10 N/mm²
b = 6 N/mm² s = 12 N/mm²

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Theory of Structures
Pick up the correct statement from the following:

All of these
In a loaded beam, the moment at which the first yield occurs is called yield moment
In a fully plastic stage of the beam, the neutral axis divides the section in two sections of equal area
In a loaded beam, the moment at which the entire section of the beam becomes fully plastic, is called plastic moment

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