Soil Mechanics Objective Type Questions - Set 07 - ObjectiveBooks

# Practice Test: Question Set - 07

1. If the coefficients of volume change and compressibility of a soil sample are respectively 6.75 × 10-2 and 3 × 10-2, the void ratio of the soil sample, is
(A) 1.10
(B) 1.15
(C) 1.20
(D) 1.30

2. When a cohesionless soil attains quick condition, it looses
(A) Shear strength
(B) Bearing capacity
(C) Both (a) and (b)
(D) Neither (a) nor (b)

3. Select the correct statement.
(A) The greater the viscosity, the greater is permeability
(B) The greater the unit weight, the greater is permeability
(C) The greater the unit weight, the smaller is permeability
(D) Unit weight does not affect permeability

4. A direct shear test possesses the following disadvantage:
(A) A relatively thin thickness of sample permits quick drainage
(B) A relatively thin thickness of sample permits quick dissipation of pore pressure developed during the test
(C) As the test progresses the area under shear, gradually changes
(D) None of these

5. A stratum of clay 2 m thick will get consolidated 80% in 10 years. For the 80% consolidation of 8 m thick stratum of the same clay, the time required is
(A) 100 years
(B) 120 years
(C) 140 years
(D) 160 years

6. 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
(A) Quick condition
(B) Boiling condition
(C) Quick sand
(D) All the above

7. The most suitable method for drainage of fine grained cohesive soils is
(A) Well point system
(B) Vacuum method
(C) Deep well system
(D) Electro-osmosis method

8. Which one of the following statements is true for Mohr-Coulomb envelope?
(A) Coulomb suggests that the relationship between shear strength and normal stress, is adequately represented by the straight line
(B) The generalised Mohr theory suggests that, though the shear stress depends on the normal stress, the relation is not linear
(C) Coulomb and Mohr suggest that a definite relationship exists among the principal stress and the angle of internal friction
(D) All the above

9. Fundamental relationship between dry density (γd), specific gravity (G), water content (ω) and percentage of air voids (na) is:
(A) γd = (1 - na) G γω/(1 + ωG)
(B) γd = (1 + na) G γω/(1 + ωG)
(C) γd = (1 + na) G γω/(1 - ωG)
(D) γd = (1 - na) G γω/(1 - ωG)

10. 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
(A) Quick test
(B) Drained test
(C) Consolidated undrained test
(D) None of these

11. Degree of consolidation is
(A) Directly proportional to time and inversely proportional to drainage path
(B) Directly proportional to time and inversely proportional to square of drainage path
(C) Directly proportional to drainage path and inversely proportional to time
(D) Directly proportional to square of drainage path and inversely proportional to time

12. Terzaghi's theory of one dimensional consolidation assumes
(A) Load is applied in one direction
(B) Coefficient of permeability is constant
(C) Excess pore water drains out only in the vertical direction
(D) All the above

13. The shear resistance of a soil is constituted basically of the following component.
(A) The frictional resistance to translocation between the individual soil particles at their contact point
(B) To the structural relation to displacement of the soil because of the interlocking of the particles
(C) Cohesion and adhesion between the surfaces of the soil particles
(D) All the above

14. The consolidation time for soils
(A) Increases with increasing compressibility
(B) Decreases with increasing permeability
(C) Increases rapidly with increasing size of soil mass
(D) All the above

15. Coefficient of compressibility is
(A) Constant for any type of soil
(B) Different for different types of soils and also different for a soil under different states of consolidation
(C) Different for different types of soils but same for a soil under different states of consolidation
(D) Independent of type of soil but depends on the stress history of soil

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