RCC Structures Design
A pre-stressed concrete member is preferred because

Its dimensions are not decided from the diagonal tensile stress
Removal of cracks in the members due to shrinkage
All listed here
Large size of long beams carrying large shear force need not be adopted

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RCC Structures Design
The angle of internal friction of soil mass is the angle whose

None of these
Cosine is equal to the ratio of the maximum resistance sliding on any internal inclined plane to the normal pressure acting on the plane
Sine is equal to the ratio of the maximum resistance to sliding on any internal inclined plane to the normal pressure acting on the plane
Tangent is equal to the rate of the maximum resistance to sliding on any internal inclined plane to the normal pressure acting on the plane

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RCC Structures Design
Steel beam theory is used for

Steel beams encased in concrete
Doubly reinforced beams ignoring compressive stress in concrete
Design of simple steel beams
Beams if shear exceeds 4 times allowable shear stress

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