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

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
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
In a singly reinforced beam

Elastic moduli for concrete and steel have different values within the limits of deformation of the beam
Compression is borne entirely by concrete
Plane sections transverse to the centre line of the beam before bending remain plane after bending
Steel possesses initial stresses when embedded in concrete

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