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

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
Cosine is equal to the ratio of the maximum resistance sliding on any internal inclined plane to the normal pressure acting on the plane
None of these
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
Pick up the assumption for the design of a pre-stressed concrete member from the following:

During deformation limits, Hook's law is equally applicable to concrete as well as to steel
A transverse plane section remains a plane after bending
Variation of stress in reinforcement due to changes in external loading is negligible
All listed here

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