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Soil Mechanics and Foundation Engineering MCQs

Free 119+ Soil Mechanics and Foundation Engineering MCQs for PPSC, FPSC, NTS, and Pakistan government job tests. Practise below with answers and explanations.

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119 questions in this list. Select an option to practice, or open a question for the full page with explanation.

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Soil Mechanics and Foundation Engineering

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1.How does soil cohesion influence the magnitudes of active and passive earth pressures?

Lowers the intensity of both active and passive earth pressuresRaises the intensity of both active and passive earth pressuresDecreases the active earth pressure but increases the passive earth pressureIncreases the active earth pressure while decreasing the passive earth pressure

2.What is a key assumption made in Bishop’s method for stability analysis?

It tends to provide a more cautious estimateIt ignores the forces acting on the lateral sides of the slicesIt considers the slip surface to be a circular arcAll of the statements above are true

3.A 6-meter-high retaining wall holds back soil with a surcharge inclination of 10°. The wall face leans away from vertical by a batter angle of 5°. Given that the friction angle between the wall and soil is 7°, at what angle to the horizontal will the resultant active earth pressure, acting 2 meters above the base, be inclined?

7 degrees10 degrees12 degrees17 degrees

4.In a cohesionless soil element located within the backfill of a retaining wall, the major principal stress is oriented how when the soil is in an active plastic equilibrium state?

Vertically aligned if the soil is actively plastically balancedVertically aligned if the soil is passively plastically balancedAt a 45° angle from the vertical axisNone of the listed options

5.According to Rankine’s earth pressure theory, how is the back face of the retaining wall characterized?

flat and frictionlessflat and with frictionvertical and frictionlessvertical and with friction

6.What is the name of the angle formed between Coulomb’s failure envelope and the horizontal plane?

shear strengthinternal friction anglerepose anglenot applicable

7.During a triaxial compression test, the introduction of extra axial stress (deviator stress) on the soil sample generates shear stress on which planes?

Only on the horizontal planesOnly on the vertical planesOn both the horizontal and vertical planesOn all planes except the horizontal and vertical onesNone of the above

8.In the initial phase of a triaxial test, the cell pressure rises from 0.10 N/mm² to 0.26 N/mm², causing the pore water pressure to increase from 0.07 N/mm² to 0.15 N/mm². What is the value of Skempton’s pore pressure coefficient B?

0.5-0.52.0-2.0

9.What is the active earth pressure coefficient for loose sand with an internal friction angle of 30°?

One thirdThreeOneOne half

10.How is the sensitivity of a soil best defined?

The percentage change in soil volume when fully saturatedThe ratio between the unconfined compressive strength of undisturbed soil and that of the same soil after being remoldedThe proportion of void space volume compared to the volume of solid particlesNone of the listed definitions

11.What is the name of the triaxial compression test where drainage is permitted only during the initial phase (application of cell pressure) but not allowed during the subsequent phase (application of deviator stress at constant cell pressure)?

drained test with consolidationconsolidated test without drainageundrained test without consolidationundrained test without consolidation and drainagenone of the above

12.What is the angle between two planes when the shear stress on both planes is zero?

45 degrees90 degrees135 degrees225 degreesNone of the above

13.When a cohesive soil sample is loaded vertically in compression, at what angle do the cracks typically form relative to the horizontal plane?

Perpendicular (90°)At a 45° angleApproximately 22.5°Parallel (0°)None of the above

14.A cylindrical sample of saturated soil failed under an unconfined axial vertical stress of 100 kN/m². The failure surface formed an angle of 45° with the horizontal. What are the soil's cohesion and internal friction angle values, respectively?

0.5 N/mm² and 30°0.05 N/mm² and 0°0.2 N/mm² and 0°0.05 N/mm² and 45°

15.The shear strength of soil primarily depends on which of the following?

only the effective stresssolely the total stressa combination of effective and total stressneither of thesenot applicable

16.What type of test is the unconfined compressive strength test classified as?

An undrained testA drained testA consolidated undrained testA consolidated drained testNone of the above

17.In a deposit consisting of normally consolidated clay, which of the following statements is true regarding the variation of effective stress, water content, and undrained shear strength with depth?

Effective stress rises with depth, while both water content and undrained shear strength decline as depth increases.Both effective stress and water content grow with increasing depth, but undrained shear strength diminishes with depth.Effective stress and undrained shear strength both increase as depth increases, whereas water content decreases with depth.Effective stress, water content, and undrained shear strength all reduce as depth increases.

18.What is the value of Skempton’s pore pressure coefficient B for fully saturated soil?

Equal to 1ZeroA value ranging from 0 to 1More than 1Not applicable

19.How does the shear strength of soil change in relation to the normal stress applied?

Increases proportionally with the soil's internal friction angleDecreases as the internal friction angle of the soil increasesReduces when normal stress increasesReduces when normal stress decreasesRemains constant regardless of normal stress

20.To achieve optimum strength and stability, how should fine-grained and coarse-grained soils be compacted in relation to their optimum moisture content (OMC)?

Below OMC for fine-grained soils and above OMC for coarse-grained soilsAbove OMC for fine-grained soils and below OMC for coarse-grained soilsAbove OMC for both fine-grained and coarse-grained soilsBelow OMC for both fine-grained and coarse-grained soilsAt exactly OMC for both soil types

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