### Geotechnical Engineering Set 4

This set of Geotechnical Engineering Multiple Choice Questions & Answers (MCQs) focuses on Geotechnical Engineering Set 4

Q1 | Effective stress is
• The stress at particles contact
• A physical parameter that can be measured
• Important because it is a function of engineering properties of soil
• All of the above
Q2 | The angle of internal friction is maximum for
• angular-grained loose sand
• angular-grained dense sand
• round-grained dense sand
• round-grained loose sand
Q3 | If the coefficients of volume change and compressibility of a soil sample are 6.75 × 10-2 and 3 × 10-2 respectively, the void ratio of the soil sample, is
• 1.1
• 1.15
• 1.2
• 1.3
Q4 | When a cohesionless soil attains quick condition, it looses
• Shear strength
• Bearing capacity
• Both (a) and (b)
• Neither (a) nor (6)
Q5 | Select the correct statement.
• The greater the viscosity, the greater is permeability
• The greater the unit weight, the greater is permeability
• The greater the unit weight, the smaller is permeability
• Unit weight does not affect permeability
Q6 | A direct shear test possesses the following disadvantage:
• A relatively thin thickness of sample permits quick drainage
• A relatively thin thickness of sample permits quick dissipation of pore pressure developed during the test
• As the test progresses the area under shear, gradually changes
• None of these
Q7 | A stratum of clay 2 m thick will get consolidated 80% in 10 years. For the 80% consolidationof 8 m thick stratum of the same clay, the time required is
• 100 years
• 120 years
• 140 years
• 160 years
Q8 | When the seepage pressure becomes equal to the pressure due to submerged weight of a soil, the effective pressure is reduced to zero and the soil particles have a tendency to move up in the direction of flow. This phenomenon is generally known
• Quick condition
• Boiling condition
• Quick sand
• All the above
Q9 | If drainage is permitted throughout the test, during the application of both normal, and shear stresses so that full consolidation occurs and no excess pore pressure is set up at any stage of the test, is known as
• Quick test
• Drained test
• Consolidated undrained test
• None of these
Q10 | Degree of consolidation is
• Directly proportional to time and inversely proportional to drainage path
• Directly proportional to time and inversely proportional to square of drainage path
• Directly proportional to drainage path and inversely proportional to time
• Directly proportional to square of drainage path and inversely proportional to time
Q11 | Terzaghi's theory of one dimensional consolidation assumes
• Load is applied in one direction
• Coefficient of permeability is constant
• Excess pore water drains out only in the vertical direction
• All the above
Q12 | The shear resistance of a soil is constituted basically of the following component.
• The frictional resistance to translocation between the individual soil particles at their contact point
• To the structural relation to displacement of the soil because of the interlocking of the particles
• Cohesion and adhesion between the surfaces of the soil particles
• All the above
Q13 | The consolidation time for soils
• Increases with increasing compressibility
• Decreases with increasing permeability
• Increases rapidly with increasing size of soil mass
• All the above
Q14 | Coefficient of compressibility is
• Constant for any type of soil
• Different for different types of soils and also different for a soil under different states of consolidation
• Different for different types of soils but same for a soil under different states of consolidation
• Independent of type of soil but depends on the stress history of soil
Q15 | The ratio of the weight of water to the weight of solids in a given mass of soil, is known
• Porosity
• Specific gravity
• Void ratio
• Water content
Q16 | In a liquid limit test, the moisture content at 10 blows was 70% and that at 100 blows was 20%. The liquid limit of the soil, is
• 35%
• 50%
• 65%
• None of these
Q17 | The critical exist gradient of seepage water in soils, increases with
• An increase in specific gravity
• A decrease in specific gravity
• A decrease in void ratio
• Both (a) and (c)
Q18 | The Mohr's straight theory is based on the following fact:
• Material fails essentially by shear
• Ultimate strength of the material is determined by the stress in the plane of slip
• Failure criterion is independent of the intermediate principal stress
• All the above
Q19 | According to Coulomb's wedge theory, the active earth pressure slides the wedge
• Down and outwards on a slip surface
• Up and inwards on a slip surface
• Horizontal upward and parallel to base
• Horizontal inward and parallel to base
Q20 | Pile foundations are generally preferred to for
• Bridge foundations
• Sky scrapper buildings
• Residential buildings
• Runways
Q21 | The rise of water table below the foundation influences the bearing capacity of soil mainly by reducing
• Cohesion and effective angle of shearing resistance
• Cohesion and effective unit weight of soil
• Effective unit weight of soil and effective angle of shearing resistance
• Effective angle of shearing resistance
Q22 | A soil mass is said to be in plastic equilibrium if
• It is stressed to maximum
• It is on the verge of failure
• It is in plastic stage
• It starts flowing
Q23 | Stoke's law states that the velocity at which a grain settles out of suspension, the other factors remaining constant, is dependent upon
• Shape of grain
• Weight of grain
• Size of grain
• Shape, size and weight of grain
Q24 | Pick up the correct statement from the following:
• A soil having pH value more than 7 is an acidic soil
• A soil having pH value less than 7 is an acidic soil
• A soil having pH value more than 7 is an alkaline soil
• A soil containing chemicals for the manufacture of Portland cement is preferred
Q25 | Contact pressure beneath a rigid footing resting on cohesive soil is
• Less at edges compared to middle
• More at edges compared to middle
• Uniform throughout
• None of the above