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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°
- 0°

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