Soil Mechanics and Foundation Engineering

211. The coefficient ka of the active earth pressure, is given by

  1. ka = (1 - tan φ)/(1 + tan φ)
  2. ka = (1 + tan φ)/(1 - tan φ)
  3. ka = (1 + sin φ)/(1 - sin φ)
  4. ka = (1 - sin φ)/(1 + sin φ)

Correct answer: (D)
ka = (1 - sin φ)/(1 + sin φ)

212. The coefficient of active earth pressure for a loose sand having an angle of internal friction of 30° is

  1. 43525
  2. 3
  3. 1
  4. 43497

Correct answer: (A)
43525

213. The coefficient of compressibility of soil, is the ratio of

  1. Stress to strain
  2. Strain to stress
  3. Stress to settlement
  4. Rate of loading to that of settlement

Correct answer: (B)
Strain to stress

214. The coefficient of curvature for a well graded soil, must be between

  1. 0.5 to 1.0
  2. 1.0 to 3.0
  3. 3.0 to 4.0
  4. 4.0 to 5.0

Correct answer: (B)
1.0 to 3.0

215. The coefficient of curvature is defined

  1. D60/D10
  2. D10/D60
  3. D302/D60 D10
  4. D202/ D30 D60

Correct answer: (C)
D302/D60 D10

216. The compressibility of clays is caused due to:

  1. Expulsion of double layer water from in between the grains
  2. Sliping of particles to new positions of greater density
  3. Bending of particles as elastic sheets
  4. All the above

Correct answer: (D)
All the above

217. The compression index of a soil

  1. Decreases with an increase in the liquid limit
  2. Increases with an increase in the liquid limit
  3. Decreases with an increase in the plastic limit
  4. Is not related with plastic limit

Correct answer: (B)
Increases with an increase in the liquid limit

218. The compression resulting from a long term static load and consequent escape of pore water, is known as

  1. Compaction
  2. Consolidation
  3. Swelling
  4. None of these

Correct answer: (B)
Consolidation

219. The consistency index of a soil is defined as the ratio of

  1. Liquid limit plus the natural water content to the plasticity index of the soil
  2. Liquid limit minus the natural water content to the plasticity index of the soil
  3. Natural water content of a soil minus plastic limit to the plasticity index of the soil
  4. Natural water content of a soil plus its plastic limit to the plasticity index of the soil

Correct answer: (B)
Liquid limit minus the natural water content to the plasticity index of the soil

220. The consolidation time for soils

  1. Increases with increasing compressibility
  2. Decreases with increasing permeability
  3. Increases rapidly with increasing size of soil mass
  4. All the above

Correct answer: (D)
All the above

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