Soil Mechanics and Foundation Engineering

41. A triaxial shear test is preferred to direct shear test, because

  1. It can be performed under all three drainage conditions with complete control
  2. Precise measurement of pore pressure and change in volume during test, is not possible
  3. Stress distribution on the failure plane, is non uniform
  4. None of these

Correct answer: (A)
It can be performed under all three drainage conditions with complete control

42. According to Atterberg, the soil is said to be of medium plasticity if the plasticity index PI is

  1. 0 < PI < 7
  2. 7< PI < 17
  3. 17 < PI <27
  4. PI > 27

Correct answer: (B)
7< PI < 17

43. According to Coulomb's wedge theory, the active earth pressure slides the wedge

  1. Down and outwards on a slip surface
  2. Up and inwards on a slip surface
  3. Horizontal upward and parallel to base
  4. Horizontal inward and parallel to base

Correct answer: (A)
Down and outwards on a slip surface

44. According to IS : 2720 - 1965, the composition of a dispersing solution used in pipette analysis for determining the size of particles, is

  1. sodium-hexametaphosphate 33 g, sodium carbonate 7 g and distilled water one litre
  2. sodium-hexametaphosphate 7 g, sodium carbonate 33 g and distilled water one litre
  3. sodium-hexametaphosphate 23 g, sodium carbonate 17 g and distilled water one litre
  4. None of these

Correct answer: (A)
sodium-hexametaphosphate 33 g, sodium carbonate 7 g and distilled water one litre

45. According to IS classification, the range of silt size particles is

  1. 4.75 mm to 2.00 mm
  2. 2.00 mm to 0.425 mm
  3. 0.425 mm to 0.075 mm
  4. 0.075 mm to 0.002 mm

Correct answer: (D)
0.075 mm to 0.002 mm

46. According to Rankine's formula, the minimum depth of foundation

  1. h = (P/W) [(1 - sin φ)/(1 + sin φ)]2
  2. h = (w/P) [(1 - sin φ)/(1 + sin φ)]2
  3. h = (P/w) [(1 - sin φ)/(1 + tan φ)]2
  4. h = (P/w) [(1 - tan φ)/(1 + tan φ)]2

Correct answer: (A)
h = (P/W) [(1 - sin φ)/(1 + sin φ)]2

47. According to the Indian Standards the specific gravity is the ratio of the unit weight of soil solids to that of water at a temperature of

  1. 17°C
  2. 23°C
  3. 27°C
  4. 30°C

Correct answer: (C)
27°C

48. Accurate determination of water content, is made by

  1. Calcium carbide method
  2. Sand bath method
  3. Alcohol method
  4. Oven-drying method

Correct answer: (D)
Oven-drying method

49. Allowable bearing pressure for a foundation depends upon

  1. Allowable settlement only
  2. Ultimate bearing capacity of soil only
  3. Both allowable settlement and ultimate bearing capacity
  4. None of above

Correct answer: (C)
Both allowable settlement and ultimate bearing capacity

50. An infinite slope is inclined at angle 'i', and has its angle of internal friction 'φ', the stability number 'Sa'

  1. cos2 i/(tan i - tan φ)
  2. sin2 i/(tan i - tan φ)
  3. (tan i - tan φ) cos2 i
  4. (tan i - tan φ) sin2 i

Correct answer: (C)
(tan i - tan φ) cos2 i

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