# Civil Engineering - Theory of Structures

### Exercise :: Theory of Structures - Section 1

31.

A material is said to be perfectly elastic if

 A. it regains its original shape on removal of the load B. It regains its original shape partially on removal of the load C. it does not regain its original shape at all D. none of these.

Explanation:

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32.

For calculating the allowable stress of long columns. The empirical formula , is known as

 A. Straight line formula B. Parabolic formula C. Perry's formula D. Rankine's formula.

Explanation:

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33.

Beams composed of more than one material, rigidly connected together so as to behave as one piece, are known as

 A. Compound beams B. Indeterminate beams C. Determinate beams D. Composite beams.

Explanation:

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34.

Pick up the correct statement from the following:

 A. In a loaded beam, the moment at which the first yield occurs is called yield moment B. In a loaded beam, the moment at which the entire section of the beam becomes fully plastic, is called plastic moment C. In a fully plastic stage of the beam, the neutral axis divides the section in two sections of equal area D. The ratio of plastic moment to the yield moment, is called shape factor E. All the above.

Explanation:

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35.

The maximum magnitude of shear stress due to shear force F on a rectangular section of area A at the neutral axis, is

 A. B. C. D. 