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This set of Geotechnical Engineering Multiple Choice Questions & Answers (MCQs) focuses on Geotechnical Engineering Set 10

Q1 | Rise of water table in cohesion-less soils upto ground surface reduces the net ultimate bearing capacity approximately by

- 25%
- 50%
- 75%
- 90%

Q2 | A decrease in water content results in a reduction of the volume of a soil in

- Liquid state
- Plastic state
- Semi solid state
- All of these

Q3 | In non-cohesive soil in passive state of plastic equilibrium

- Major principal stress is horizontal
- Minor principal stress is vertical
- Major principal stress is vertical
- Minor and major principal stresses are equally inclined to the horizontal

Q4 | A soil has a bulk density of 22 kN/m3 and water content 10 %. The dry density of soil is

- 18.6 kN/m3
- 20.0 kN/m3
- 22.0 kN/m3
- 23.2 kN/m3

Q5 | If the sand in-situ is in its densest state, then the relative density of sand is

- Zero
- 1
- Between 0 and 1
- Greater than 1

Q6 | If dry density, water density and specific gravity of solids of a given soil sample are 1.6 g/cc, 1.84 g/cc and 2.56 respectively, the porosity of the soil sample, is

- 0.375
- 0.37
- 0.38
- 0.39

Q7 | The property of a soil which permits water to percolate through it, is called

- Moisture content
- Permeability
- Capillarity
- None of these

Q8 | Toughness index is defined as the ratio of

- Plasticity index to consistency index
- Plasticity index to flow index
- Liquidity index to flow index
- Consistency index to liquidity index

Q9 | A moist soil sample of volume 60 cc. weighs 108 g and its dried weight is 86.4 g. If its absolute density is 2.52, the degree of saturation is

- 54%
- 64%
- 74%
- 84%

Q10 | The hydraulic head that would produce a quick condition in a sand stratum of thickness 1.5m, specific gravity 2.67 and voids ratio 0.67 is equal to

- 1.0 m
- 1.5 m
- 2.0 m
- 3 m

Q11 | The factor which affects the compaction, is

- Moisture content
- Compacting content
- Method of compaction
- All the above

Q12 | In a consolidated drained test on a normally consolidated clay, the volume of the soil sample during shear

- Decreases
- Increases
- Remains unchanged
- First increases and then decreases

Q13 | Pick up the correct statement from the following:

- The rise of the ground surface due to frost action is called frost heave
- The freezing of water is accompanied by a volume increase of 9%
- Below freezing point, higher soil suction develops
- All the above

Q14 | The maximum value of effective stress in the past divided by the present value is defined as over consolidation ratio (OCR). The O.C.R. of an over consolidated clay is

- Less than 1
- 1
- More than 1
- None of these

Q15 | A 300 mm square bearing plate settles by 15 mm in a plate load test on a cohesive soil when the intensity of loading is 0.2 N/mm². The settlement of a prototype shallow footing 1 m square under the same intensity of loading is

- 15 mm
- 30 mm
- 50 mm
- 167 mm

Q16 | The effective size of particles of soil is denoted by

- D10
- D20
- D30
- D60

Q17 | If S, L and R are the arc length, long chord and radius of the sliding circle then the perpendicular distance of the line of the resultant cohesive force, is given by

- a = S.R/ L
- a = L.S/R
- a = L.R/S
- None of these

Q18 | Uniformity coefficient of a soil is

- Always less than 1
- Always equal to 1
- Equal to or less than 1
- Equal to or greater than 1

Q19 | The fluid generally used for grouting is

- Cement and water mix
- Clay suspension
- Sodium silicate
- All the above

Q20 | The total and effective stresses at a depth of 5 m below the top level of water in a swimmingpool are respectively

- Zero and zero
- 0.5 kg/cm² and zero
- 0.5 kg/cm² and 0.5 kg/cm²
- 1.0 kg/cm² and 0.5 kg/cm²

Q21 | Time factor for a clay layer is

- A dimensional parameter
- Directly proportional to permeability of soil
- Inversely proportional to drainage path
- Independent of thickness of clay layer

Q22 | The critical exist gradient of seepage water in soils, is

- Directly proportional to the voids ratio
- Inversely proportional to the specific gravity
- Directly proportional to the specific gravity
- None of these

Q23 | In the triaxial compression test, the application of additional axial stress (i.e. deviator stress)on the soil specimen produces shear stress on

- Horizontal plane only
- Vertical plane only
- Both horizontal and vertical planes
- All planes except horizontal and vertical planes

Q24 | For a clay slope of height of 10 m, the stability number is 0.05, = 2.0 t/m3, C = 2.5 t/m2,the critical height of the slope of the soil, is

- 4.0 m
- 12.5 m
- 25.0 m
- 15.0 m

Q25 | Allowable bearing pressure for a foundation depends upon

- Allowable settlement only
- Ultimate bearing capacity of soil only
- Both allowable settlement and ultimate bearing capacity
- None of above