Exam Test Questions Soil Mechanics and Foundation Engineering - Set 12 - ObjectiveBooks

# Practice Test: Question Set - 12

1. Compression of soil occurs rapidly if voids are filled with
(A) Air
(B) Water
(C) Partly with air and partly with water
(D) None of these

2. For better strength and stability, the fine grained soils and coarse grained soils are compacted respectively as
(A) Dry of OMC and wet of OMC
(B) Wet of OMC and dry of OMC
(C) Wet of OMC and wet of OMC
(D) Dry of OMC and dry of OMC where OMC is optimum moisture content

3. Chemical weathering of soil is caused due to
(A) Oxidation
(B) Carbonation
(C) Hydration
(D) All the above

4. Terzaghi's analysis assumes:
(A) Soil is homogeneous and isotropic
(B) Elastic zone has straight boundaries inclined at ψ = φ to the horizontal and plastic zones fully developed
(C) Failure zones do not extend above the horizontal plane through the base of the footing
(D) All the above

5. According to IS : 2720 - 1965, the composition of a dispersing solution used in pipette analysis for determining the size of particles, is
(A) Sodium-hexametaphosphate 33 g, sodium carbonate 7 g and distilled water one litre
(B) Sodium-hexametaphosphate 7 g, sodium carbonate 33 g and distilled water one litre
(C) Sodium-hexametaphosphate 23 g, sodium carbonate 17 g and distilled water one litre
(D) None of these

6. If the shearing stress is zero on two planes, then the angle between the two planes is
(A) 45°
(B) 90°
(C) 135°
(D) 225°

7. A suspended particle falls through a height ‘H’ cm in water in ‘t’ minutes. If the viscosity of water is ‘η’ and specific gravity of the particle is ‘G’, the diameter of the particle is (where M is a constant factor)
(A) 103M (H/t)
(B) 104M (H/t)
(C) 105M (H/t)
(D) 102M (H/t)

8. The ultimate bearing capacity of a soil, is
(A) Total load on the bearing area
(B) Safe load on the bearing area
(C) Load at which soil fails
(D) Load at which soil consolidates

9. The minimum depth of building foundations on
(A) Sandy soils is 80 cm to 100 cm
(B) Clay soils is 90 cm to 160 cm
(C) Rocky soils is 5 cm to 50 cm
(D) All the above

10. The effect of cohesion on a soil is to
(A) Reduce both the active earth pressure intensity and passive earth pressure intensity
(B) Increase both the active earth pressure intensity and passive earth pressure intensity
(C) Reduce the active earth pressure intensity but to increase the passive earth pressure intensity
(D) Increase the active earth pressure intensity but to reduce the passive earth pressure intensity

11. If voids ratio is 0.67, water content is 0.188 and specific gravity is 2.68, the degree of saturation of the soil, is
(A) 25 %
(B) 40 %
(C) 60 %
(D) 75 %

12. Pick up the incorrect statement from the following:
(A) The smaller the size of the pores, the higher the water can rise above the water table
(B) Below the water table, the pore water may be static
(C) The hydrostatic pressure depends on the depth below the water level
(D) None of these

13. A soil mass coated with a thin layer of paraffin weighs 460 g. When immersed, it displaces 299 cc of water. The weight of paraffin is 10 g. If specific gravity of solids is 2.5 and that of paraffin 0.9, the void ratio of soil, is
(A) 0.55
(B) 0.60
(C) 0.65
(D) 0.70

14. Select the incorrect statement.
(A) Bearing capacity of a soil depends upon the amount and direction of load
(B) Bearing capacity of a soil depends on the type of soil
(C) Bearing capacity of a soil depends upon shape and size of footing
(D) Bearing capacity of a soil is independent of rate of loading

15. The ratio of emax and emin of silty sand, is
(A) 2.0
(B) 2.5
(C) 3.0
(D) 3.5

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