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This set of Geotechnical Engineering Multiple Choice Questions & Answers (MCQs) focuses on Geotechnical Engineering Set 9

Q1 | A retaining wall 6m high supports a backfill with a surcharge angle of 10°. The back of the wall is inclined to the vertical at a positive batter angle of 5°. If the angle of wall friction is 7°, then the resultant active earth pressure will act at a distance of 2 m above the base and inclined to the horizontal at an angle of

- 7°
- 10°
- 12°
- 17°

Q2 | The minimum water content at which the soil just begins to crumble when rolled into threads 3 mm in diameter, is known

- Liquid limit
- Plastic limit
- Shrinkage limit
- Permeability limit

Q3 | The minimum water content at which the soil retains its liquid state and also possesses a small shearing strength against flowing, is known

- Liquid limit
- Plastic limit
- Shrinkage limit
- Permeability limit

Q4 | 'Drift' is the material picked up, mixed, disintegrated, transported and redeposited by

- Wind
- Gravitational force
- Glaciated water
- All the above

Q5 | The ratio of volume of voids to the total volume of soil mass is called

- Air content
- Porosity
- Percentage air voids
- Voids ratio

Q6 | The ratio of the volume of voids to the volume of soil solids in a given soil mass, is known

- Porosity
- Specific gravity
- Void ratio
- Water content

Q7 | The specific yield of soil depends upon

- Compaction of stratum
- Distribution of pores
- Shape and size of particles
- All the above

Q8 | The hydrometer method of sedimentation analysis differs from the pipette analysis mainly in

- The principle of test
- The method of taking observations
- The method of preparation of soil suspension
- All of the above

Q9 | Degree of saturation of a natural soil deposit having water content 15%, specific gravity 2.50 and void ratio 0.5, is

- 50%
- 60%
- 75%
- 80%

Q10 | Cohesionless soil is

- Sand
- Silt
- Clay
- Clay and silt

Q11 | At liquid limit, all soils possess

- Same shear strength of small magnitude
- Same shear strength of large magnitude
- Different shear strengths of small magnitude
- Different shear strengths of large magnitude

Q12 | The ratio of the weight of given volume of soil solids to the weight of an equal volume of distilled water at the given temperature, is known

- Porosity
- Specific gravity
- Void ratio
- Water content

Q13 | If the water table rises upto ground surface, then the

- Effective stress is reduced due to decrease in total stress only but pore water pressure does not change
- Effective stress is reduced due to increase in pore water pressure only but total stress does not change
- Total stress is reduced due to increase in pore water pressure only but effective stress does not change
- Total stress is increased due to decrease in pore water pressure but effective stress does not change

Q14 | A coarse-grained soil has a voids ratio 0.75, and specific gravity as 2.75. The critical gradient at which quick sand condition occurs, is

- 0.25
- 0.5
- 0.75
- 1

Q15 | The shear strength of a soil

- Increases with an increase in the normal stress
- Is proportional to the cohesion of the soil
- Is generally known as the strength of the soil
- All the above

Q16 | Total number of stress components at a point within a soil mass loaded at its boundary is

- 3
- 6
- 9
- 16

Q17 | The ratio of the undrained strength in the undrained state to the undrained strength, at the same water content, in the remoulded state, is called the sensivity of the clay. Its value for quick clays is

- 4
- 8
- 12
- 20

Q18 | The ultimate consolidation settlement of a soil is

- Directly proportional to the voids ratio
- Directly proportional to the compression index
- Inversely proportional to the compression index
- None of the above

Q19 | The ratio of settlement at any time 't' to the final settlement, is known as

- Co-efficient of consolidation
- Degree of consolidation
- Consolidation index
- Consolidation of undisturbed soil

Q20 | Pick up the correct statement from the following:

- In hydrometer method, weight W d per ml of suspension is found directly
- In pipette analysis, weight Wd per ml of suspension is found indirectly
- In pipette analysis, weight Wd per ml of suspension is found directly
- None of these

Q21 | Unconfmed compressive strength test is

- Undrained test
- Drained test
- Consolidated undrained test
- Consolidated drained test

Q22 | For shear strength, triaxial shear test is suitable because

- It can be performed under all three drainage conditions
- Precise measurement of the pore pressure and volume change during the test is possible
- Stress distribution on the failure plane, is uniform
- All the above

Q23 | The zero atmospheric pressure is at

- Sea level
- Water table
- Phreatic surface
- Both (B) and (C) of the above

Q24 | Terzaghi's bearing capacity factors Nc, Nq and Nr are functions of

- Cohesion only
- Angle of internal friction only
- Both cohesion and angle of internal friction
- None of the above

Q25 | 'Loess' is silty clay formed by the action of

- Water
- Glacier
- Wind
- Gravitational force