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Shear strength (Mohr-Coulomb theory) MCQs Civil

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1. Shear strength of soil is the resistance to:




2. According to Mohr–Coulomb theory, shear strength (τ) is given by:




3. In the equation τ = c + σ tanφ, “c” represents:




4. In the equation τ = c + σ tanφ, “φ” represents:




5. Shear strength parameters are:




6. The Mohr–Coulomb failure envelope is:




7. For purely cohesive soil (φ = 0), the shear strength equals:




8. For purely cohesionless soil (c = 0), shear strength equals:




9. The total shear strength of soil is contributed by:




10. The Mohr circle represents:




11. The maximum shear stress on Mohr’s circle is given by:




12. Principal planes carry:




13. On principal planes, the shear stress is:




14. Direct shear test is used to determine:




15. Triaxial test is more reliable than direct shear test because:




16. In an unconfined compression test, the confining pressure is:




17. For saturated clay, the effective stress is:




18. During quick (undrained) loading of saturated clay:




19. The total shear strength of saturated clay under undrained condition depends on:




20. The unconfined compressive strength (qu) of a saturated clay is equal to:




21. Effective stress controls:




22. The angle of repose of dry sand is approximately equal to:




23. The shear strength of saturated clay increases with:




24. The failure plane in direct shear test is:




25. The triaxial test provides failure along:




26. Shear strength of soil decreases when:




27. The angle between major principal plane and plane of maximum shear stress is:




28. For normally consolidated clay, the shear strength increases:




29. For over-consolidated clay, shear strength is:




30. The parameter ‘c’ (cohesion) for clean dry sand is:




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