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
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
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

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RCC Structures Design
Based on punching shear consideration, the overall depth of a combined footing under a column A, is

(Perimeter of column A × Safe punching stress)/(Load on column A + Upward pressure × Area of the column)
None of these
(Perimeter of column A × Safe punching stress)/(Load on column A × Upward pressure × Area of the column)
(Area of the column A × Safe punching stress)/Load on column A

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