### Geotechnical Engineering Set 3

This set of Geotechnical Engineering Multiple Choice Questions & Answers (MCQs) focuses on Geotechnical Engineering Set 3

Q1 | Plasticity index is defined as the range of water content between
• Liquid and plastic limit
• Plastic limit and semi solid limit
• Semi-solid limit and liquid limit
• Liquid limit and solid limit
Q2 | Bishop's method of stability analysis
• Is more conservative
• Neglects the effect of forces acting on the sides of the slices
• Assumes the slip surface as an arc of a circle
• All of the above
Q3 | You are given a sample of soil containing coarse grains to determine its water content, you will use
• Pycnometer
• Oven-drying method
• Calcium carbide method
• Alcohol method
Q4 | Pick up the incorrect definition from the following:
• Ratio of the compressive strength of unconfined undisturbed soil to that of remoulded soil, is known as the sensitivity of the soil sample
• The rotation of soil particles into stable state while remoulding, is known as the thiostropy of soil
• The water content at which a soil flows, is known plastic limit of the soil
• None of these
Q5 | A 600 mm square bearing plate settles by 15 mm in plate load test on a cohesion-less soil under an intensity of loading of 0.2 N/ram². The settlement of a prototype shallow footing 1 m square under the same intensity of loading is
• 15 mm
• Between 15 mm and 25 mm
• 25 mm
• Greater than 25 mm
Q6 | The angle between the directions of the failure and the major principal plane, is equal to
• 90° + effective angle of shearing resistance
• 90° + half of the angle of shearing resistance
• 45° - half of the angle of shearing resistance
• 45° + half of the angle of shearing resistance
Q7 | In active state of plastic equilibrium in a non cohesive soil with horizontal ground surface
• Major principal stress is horizontal
• Minor principal stress is vertical
• Major principal stress is vertical
• Minor and major principal stresses are equally inclined to horizontal
Q8 | Residual soils are formed by
• Glaciers
• Wind
• Water
• None of the above
Q9 | A soil not fully consolidated under the existing over-burden pressure, is called
• Pre-consolidated
• Normally consolidated
• Over-consolidated
• None of these
Q10 | Pick up the correct statement from the following:
• Illite bond is weaker than Kaolinite bond
• Illite bond is stronger than montmorillonite bond
• Illite does not swell when wet
• All the above
Q11 | If Cv is the coefficient of consolidation,t is the time and d is drainage path of one dimensional consolidation of soil, the time factor Tv, is given by
• Tv = d²/Cvt
• Tv = t²/d²Cv
• Tv = Cv3/d²t
• Tv = Cvt/dt²
Q12 | Select the correct statement.
• Unit weight of dry soil is greater than unit weight of wet soil
• For dry soils, dry unit weight is less than total unit weight
• Unit weight of soil increases due to submergence in water
• Unit weight of soil decreases due to submergence in water
Q13 | The bearing capacity of a soil depends upon
• Size of the particles
• Shape of the particles
• Cohesive properties of particles
• All the above
Q14 | Pick up the correct statement from the following:
• The void ratio in soils is defined as the ratio of the volume of voids to the volume of solids
• The bulk density of a soil is defined as the unit weight of the soil
• The dry density of a soil is defined as weight of solids to the total volume of the soil
• All the above
Q15 | If the water content of a fully saturated soil mass is 100%, then the voids ratio of the sample is
• Less than specific gravity of soil
• Equal to specific gravity of soil
• Greater than specific gravity of soil
• Independent of specific gravity of soil
Q16 | If water content of a soil is 40%, G is 2.70 and void ratio is 1.35, the degree of saturation is
• 70%
• 75%
• 80%
• 85%
Q17 | Stoke's law is valid only if the size of particle is
• Less than 0.0002 mm
• Greater than 0.2 mm
• Between 0.2 mm and 0.0002 mm
• All of the above
Q18 | Pick up the correct statement applicable to plate load test
• Width of the test pit for plate load test is made five times the width of the plate
• At the centre of the test pit, a hole is dug out whose size is kept equal to the size of the test plate
• Bottom level of the hole dug at the centre of the test pit, is kept at the level of the actual formation
• All the above
Q19 | Failure of a slope occurs only when total shear force is
• Equal to total shearing strength
• Greater than total shearing strength
• Less than total shearing strength
• None of these
Q20 | If the natural water content of soil mass lies between its liquid limit and plastic limit, the soil mass is said to be in
• Liquid state
• Plastic state
• Semisolid state
• Solid state
Q21 | Pick up the correct statement from the following:
• The permeability of the coarse-grained soils may be reduced by grouting
• The process of injecting fluids (i.e. grouts) into the pores space of the soil is called grouting
• The grouting increases the soil strength
• All the above
Q22 | Negative skin friction on piles
• Is caused due to relative settlement of the soil
• Is caused in soft clays
• Decreases the pile capacity
• All of the above
Q23 | Select the correct statement.
• A uniform soil has more strength and stability than a nonuniform soil
• A uniform soil has less strength and stability than a nonuniform soil
• Uniformity coefficient does not affect strength and stability
• Uniformity coefficient of a poorly graded soil is more than that of a well graded soil
Q24 | If a soil undergoes a change in shape and volume by application of external loads over it, but recovers its shape and volume immediately after removal of the load, the property of the soil is said to be
• Resilience of soils
• Elasticity of soils
• Compressibility of soils
• None of these
Q25 | The water content in a soil sample when it continues to loose weight without loosing the volume, is called
• Shrinkage limit
• Plastic limit
• Liquid limit
• Semi-solid limit