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When does the shear failure of soils take place?
1. When the residual strength of the soil is exhausted.
2. When ϕ reaches its maximum value in cohesionless soils
3. When the maximum cohesion is reached in cohesion soils
4. When the angle of obliquity is maximum

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Correct Answer - Option 4 : When the angle of obliquity is maximum

Explanation:

The angle of obliquity is the angle made by normal stress with shear stress acting at a point in the soil mass. A soil fails in shear if this angle of obliquity is maximum which is called critical angle and failure plane called critical plane as per Mohr-Columb's criteria. 

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