The Angle of Internal Friction of Clays is Usually

Answer - B. 5° to 20°

The angle of internal friction of clays is usually 5° to 20°.

Solution

Theoretically, the angle of internal friction for pure clay is 0°. Pure clays are rarely found in topsoil and the angle of internal friction value increases with an increase in the quantity of sand, the angle of internal friction of clays is usually in the range of 5° to 20°.

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