Soil Mechanics and Foundation Engineering MCQs

86. Select the incorrect statement ?

A. In a direct shear box test, the plane of shear failure is predetermined
B. Better control is achieved on the drainage of the soil in a triaxial compression test
C. Stress distribution on the failure plane in the case of triaxial compression test is uniform
D. Unconfined compression test can be carried out on all types of soils
✅ The correct answer is option D.

87. The effect of cohesion on a soil is to______________?

A. reduce both the active earth pressure intensity and passive earth pressure intensity
B. increase both the active earth pressure intensity and passive earth pressure intensity
C. reduce the active earth pressure in-tensity but to increase the passive earth pressure intensity
D. increase the active earth pressure in-tensity but to reduce the passive earth pressure intensity
✅ The correct answer is option C.

88. Which of the following statements is correct ?

A. Uniformity coefficient represents the shape of the particle size distribution curve
B. For a well graded soil, both uniformity coefficient and coefficient of curvature are nearly unity
C. A soil is said to be well graded if it has most of the particles of about the same size
D. none of the above
✅ The correct answer is option D.

89. Effective stress is______________?

A. the stress at particles contact
B. a physical parameter that can be measured
C. important because it is a function of engineering properties of soil
D. all of the above
✅ The correct answer is option C.
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