### Geotechnical Engineering Set 10

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