Q.

The angle of internal friction of soil mass is the angle whose

• ATangent is equal to the rate of the maximum resistance to sliding on any internal inclined plane to the normal pressure acting on the plane
• BSine is equal to the ratio of the maximum resistance to sliding on any internal inclined plane to the normal pressure acting on the plane
• CCosine is equal to the ratio of the maximum resistance sliding on any internal inclined plane to the normal pressure acting on the plane
• DNone of these