Soil Mechanics and Foundation Engineering

191. Stoke's law is valid only if the size of particle is

  1. Less than 0.0002 mm
  2. Greater than 0.2 mm
  3. Between 0.2 mm and 0.0002 mm
  4. All of the above

Correct answer: (C)
Between 0.2 mm and 0.0002 mm

192. Stoke's law states that the velocity at which a grain settles out of suspension, the other factors remaining constant, is dependent upon

  1. Shape of grain
  2. Weight of grain
  3. Size of grain
  4. Shape, size and weight of grain

Correct answer: (D)
Shape, size and weight of grain

193. 'Talus' is the soil transported by

  1. Wind
  2. Water
  3. Glacier
  4. Gravitational force

Correct answer: (D)
Gravitational force

194. Terzaghi's analysis assumes:

  1. Soil is homogeneous and isotropic
  2. Elastic zone has straight boundaries inclined at ψ = φ to the horizontal and plastic zones fully developed
  3. Failure zones do not extend above the horizontal plane through the base of the footing
  4. All the above

Correct answer: (D)
All the above

195. Terzaghi's bearing capacity factors Nc, Nq and Nr are functions of

  1. Cohesion only
  2. Angle of internal friction only
  3. Both cohesion and angle of internal friction
  4. None of the above

Correct answer: (B)
Angle of internal friction only

196. Terzaghi's theory of one dimensional consolidation assumes

  1. Load is applied in one direction
  2. Coefficient of permeability is constant
  3. Excess pore water drains out only in the vertical direction
  4. All the above

Correct answer: (D)
All the above

197. The active earth pressure of a soil is proportional to (where is the angle of friction of the soil)

  1. tan (45° - φ)
  2. tan2 (45° + φ/2)
  3. tan2 (45° - φ/2)
  4. tan (45° + φ)

Correct answer: (C)
tan2 (45° - φ/2)

198. The admixture of coarser particles like sand or silt to clay causes

  1. Decrease in liquid limit and increase in plasticity index
  2. Decrease in liquid limit and no change in plasticity index
  3. Decrease in both liquid limit and plasticity index
  4. Increase in both liquid limit and plasticity index

Correct answer: (C)
Decrease in both liquid limit and plasticity index

199. The angle between the directions of the failure and the major principal plane, is equal to

  1. 90° + effective angle of shearing resistance
  2. 90° + half of the angle of shearing resistance
  3. 45° - half of the angle of shearing resistance
  4. 45° + half of the angle of shearing resistance

Correct answer: (D)
45° + half of the angle of shearing resistance

200. The angle of internal friction is maximum for

  1. angular-grained loose sand
  2. angular-grained dense sand
  3. round-grained dense sand
  4. round-grained loose sand

Correct answer: (B)
angular-grained dense sand

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