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
The self-weight of the footing, is

Also considered for calculating the upward pressure on footing
Both (b) and (c)
Not considered for calculating the upward pressure on footing
Not considered for calculating the area of the footing

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