Objective Questions and Answers Soil Mechanics - Set 05 - ObjectiveBooks

# Practice Test: Question Set - 05

1. Pick up the incorrect definition from the following:
(A) Ratio of the compressive strength of unconfined undisturbed soil to that of remoulded soil, is known as the sensitivity of the soil sample
(B) The rotation of soil particles into stable state while remoulding, is known as the thiostropy of soil
(C) The water content at which a soil flows, is known plastic limit of the soil
(D) None of these

2. 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
(A) 15 mm
(B) Between 15 mm and 25 mm
(C) 25 mm
(D) Greater than 25 mm

3. According to Rankine's formula, the minimum depth of foundation
(A) h = (P/W) [(1 - sin ϕ)/(1 + sin ϕ)]2
(B) h = (w/P) [(1 - sin ϕ)/(1 + sin ϕ)] 2
(C) h = (P/w) [(1 - sin ϕ)/(1 + tan ϕ)] 2
(D) h = (P/w) [(1 - tan ϕ)/(1 + tan ϕ)] 2

4. The angle between the directions of the failure and the major principal plane, is equal to
(A) 90° + effective angle of shearing resistance
(B) 90° + half of the angle of shearing resistance
(C) 45° - half of the angle of shearing resistance
(D) 45° + half of the angle of shearing resistance

5. In active state of plastic equilibrium in a non cohesive soil with horizontal ground surface
(A) Major principal stress is horizontal
(B) Minor principal stress is vertical
(C) Major principal stress is vertical
(D) Minor and major principal stresses are equally inclined to horizontal

6. Residual soils are formed by
(A) Glaciers
(B) Wind
(C) Water
(D) None of the above

7. A soil not fully consolidated under the existing over-burden pressure, is called
(A) Pre-consolidated
(B) Normally consolidated
(C) Over-consolidated
(D) None of these

8. Pick up the correct statement from the following:
(A) Illite bond is weaker than Kaolinite bond
(B) Illite bond is stronger than montmorillonite bond
(C) Illite does not swell when wet
(D) All the above

9. 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
(A) Tv = d2/ Cvt
(B) Tv = t2/ d2Cv
(C) Tv = Cv3/d2t
(D) Tv = Cvt/dt2

10. Select the correct statement.
(A) Unit weight of dry soil is greater than unit weight of wet soil
(B) For dry soils, dry unit weight is less than total unit weight
(C) Unit weight of soil increases due to submergence in water
(D) Unit weight of soil decreases due to submergence in water

11. The bearing capacity of a soil depends upon
(A) Size of the particles
(B) Shape of the particles
(C) Cohesive properties of particles
(D) All the above

12. Fundamental relationship between dry density (γd), bulk density (γ) and water content (ω), is:
(A) γ = γd/1 + ω
(B) γd = γ/1 + ω
(C) ω = γ/1 + γd
(D) ω = γ/1 - γd

13. Pick up the correct statement from the following:
(A) The void ratio in soils is defined as the ratio of the volume of voids to the volume of solids
(B) The bulk density of a soil is defined as the unit weight of the soil
(C) The dry density of a soil is defined as weight of solids to the total volume of the soil
(D) All the above

14. If the water content of a fully saturated soil mass is 100%, then the voids ratio of the sample is
(A) Less than specific gravity of soil
(B) Equal to specific gravity of soil
(C) Greater than specific gravity of soil
(D) Independent of specific gravity of soil

15. If water content of a soil is 40%, G is 2.70 and void ratio is 1.35, the degree of saturation is
(A) 70 %
(B) 75 %
(C) 80 %
(D) 85 %

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