Soil Mechanics and Foundation Engineering

11. A direct shear test possesses the following disadvantage:

  1. A relatively thin thickness of sample permits quick drainage
  2. A relatively thin thickness of sample permits quick dissipation of pore pressure developed during the test
  3. As the test progresses the area under shear, gradually changes
  4. None of these

Correct answer: (C)
As the test progresses the area under shear, gradually changes

12. A failure wedge develops if a retaining wall

  1. Moves away from the backfill
  2. Moves towards the backfill
  3. Sinks downwards
  4. Stresses equally by vertical and horizontal forces

Correct answer: (A)
Moves away from the backfill

13. A flow net may be utilised for the determination of

  1. Exit gradient
  2. Seepage
  3. Hydrostatic pressure
  4. All the above

Correct answer: (D)
All the above

14. A fully saturated soil is said to be

  1. One phase system
  2. Two phase system with soil and air
  3. Two phase system with soil and water
  4. Three phase system

Correct answer: (C)
Two phase system with soil and water

15. A fundamental equation of void ratio (e), specific gravity (G), water content (ω) and degree of saturation (Sr) is

  1. e = ω/Sr
  2. ω = eG/Sr
  3. G = eω/S
  4. Sr = eω/G

Correct answer: (A)
e = ω/Sr

16. A grillage foundation

  1. Is provided for heavily loaded isolated columns
  2. Is treated as spread foundation
  3. Consists of two sets of perpendicularly placed steel beams
  4. All the above

Correct answer: (D)
All the above

17. A inage and coefficient of consolidation Cv takes 6 months to achieve 50% consolidation. The time taken by clay layer 'B' of the same thickness with double drainage and coefficient of consolidation Cv/2 to achieve the same degree of consolidation is

  1. 3 months
  2. 6 months
  3. 12 months
  4. 24 months

Correct answer: (A)
3 months

18. A moist soil sample of volume 60 cc. weighs 108 g and its dried weight is 86.4 g. If its absolute density is 2.52, the degree of saturation is

  1. 54 %
  2. 64 %
  3. 74 %
  4. 84 %

Correct answer: (D)
84 %

19. A moist soil sample weighing 108 g has a volume of 60 cc. If water content is 25% and value of G = 2.52, the void ratio is

  1. 0.55
  2. 0.65
  3. 0.75
  4. 0.8

Correct answer: (C)
0.75

20. A normally consolidated clay settled 10 mm when effective stress was increased from 100 kN/m2 to 200 kN/m2. If the effective stress is further increased from 200 kN/m2 to 400 kN/m2, then the settlement of the same clay is

  1. 10 mm
  2. 20 mm
  3. 40 mm
  4. None of the above

Correct answer: (A)
10 mm

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