Geotechnical Engineering Set 7

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This set of Geotechnical Engineering Multiple Choice Questions & Answers (MCQs) focuses on Geotechnical Engineering Set 7

Q1 | The internal molecular attraction of a soil, the cohesion
  • Decreases as the moisture content increases
  • Increases as the moisture content decreases
  • Is more in well compacted clays
  • Depends upon the external applied load
Q2 | Which of the following is a measure of particle size range?
  • Effective size
  • Uniformity coefficient
  • Coefficient of curvature
  • None of the above
Q3 | If Nf, Nd and H are total number flow channels, total number of potential drops and total hydraulic head differences respectively, the discharge q through the complete flow is given by (where K is a constant)
  • q = (Nf/Nd)
  • q = KH (Nd/(Nf)
  • q = KH (Nf/Nd)
  • q = KH Nf/Nd)
Q4 | A failure wedge develops if a retaining wall
  • Moves away from the backfill
  • Moves towards the backfill
  • Sinks downwards
  • Stresses equally by vertical and horizontal forces
Q5 | The admixture of coarser particles like sand or silt to clay causes
  • Decrease in liquid limit and increase in plasticity index
  • Decrease in liquid limit and no change in plasticity index
  • Decrease in both liquid limit and plasticity index
  • Increase in both liquid limit and plasticity index
Q6 | A partially saturated sample of soil has a unit weight of 2.0 g/cm3 and specific gravity of soil particles is 2.6. If the moisture content in the soil is 20%, the degree of saturation is
  • 20%
  • 77%
  • 92%
  • None of these
Q7 | The shearing strength of a cohesion-less soil depends upon
  • Dry density
  • Rate of loading
  • Confining pressure
  • Nature of loading
Q8 | Sand particles are made of
  • Rock minerals
  • Kaolinite
  • Illite
  • Montmorillonite
Q9 | The water content of soil is defined as the ratio of
  • Volume of water to volume of given soil
  • Volume of water to volume of voids in soil
  • Weight of water to weight of air in voids
  • Weight of water to weight of solids of given mass of soil
Q10 | A critical hydraulic gradient may occur when
  • Flow is in upward direction
  • Seepage pressure is in upward direction
  • Effective pressure is zero
  • All the above
Q11 | Which of the following methods is best suited for determination of permeability of coarsegrained soils?
  • Constant head method
  • Falling head method
  • Both the above
  • None of the above
Q12 | Back fill with a sloping surface exerts a total active pressure Pa on the wall of height H and acts at
  • H/4 above the base parallel to base
  • H/2 above the base parallel to base
  • H/3 above the base parallel to base
  • H/5 above the base parallel to base
Q13 | The slope of isochrone at any point at a given time indicates the rate of change of
  • Effective stress with time
  • Effective stress with depth
  • Pore water pressure with depth
  • Pore water pressure with time
Q14 | The ratio of the volume of water present in a given soil mass to the total volume of itsvoids, is known
  • Porosity
  • Void ratio
  • Percentage voids
  • Degree of saturation
Q15 | A soil has bulk density 2.30 g/cm3 and water content 15 per cent, the dry density of the sample, is
  • 1.0 g/cm2
  • 1.5 g/cm3
  • 2.0 g/cm3
  • 2.5 g/cm3
Q16 | The total active earth pressure due to dry back fill with no surcharge, acts at H/3 above the base of the wall and is directly proportional to
  • H
  • H
  • H2
  • H3
Q17 | Coefficient of consolidation for clays normally
  • Decreases with increase in liquid limit
  • Increases with increase in liquid limit
  • First increases and then decreases with increase in liquid limit
  • Remains constant at all liquid limits
Q18 | The maximum dry density upto which any soil can be compacted depends upon
  • Moisture content only
  • Amount of compaction energy only
  • Both moisture content and amount of compaction energy
  • None of the above
Q19 | For determine the specific gravity of soil solids, using a pycnometer of 500 cc., the following data is available : Weight of dry empty pycnometer = 125 g Weight of dried soil and pycnometer = 500 g Weight of dried soil and distilled = 850 g water filled in pycnometer up to top The specific gravity of soil solids, is
  • 2
  • 2.25
  • 2.5
  • 2.75
Q20 | If there is no impervious boundary at the bottom of a hydraulic structure, stream lines tendto follow:
  • A straight line
  • A parabola
  • A semi-ellipse
  • A semi-circle
Q21 | If a cohesive soil specimen is subjected to a vertical compressive load, the inclination of thecracks to the horizontal is
  • 90°
  • 45°
  • 22.5°
Q22 | The Westergaard analysis is used for
  • Sandy soils
  • Cohesive soils
  • Stratified soils
  • Clayey soils
Q23 | Cohesive soils are generally
  • Plastic and also compressible
  • Elastic and also compressible
  • Plastic but incompressible
  • None of these
Q24 | The ratio of the volume of voids to the total volume of the given soil mass, is known
  • Porosity
  • Specific gravity
  • Void ratio
  • Water content
Q25 | The total weight of a pycnometer with water and oven dried soil 20 ( g) is 1600 g. The pycnometer filled with water alone weighs 1500 g. The specific gravity of the soil, is
  • 1
  • 1.5
  • 2
  • 2.5