Soil Mechanics and Foundation Engineering
191. Stoke's law is valid only if the size of particle is
- Less than 0.0002 mm
- Greater than 0.2 mm
- Between 0.2 mm and 0.0002 mm
- 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
- Shape of grain
- Weight of grain
- Size of grain
- Shape, size and weight of grain
Correct answer: (D)
Shape, size and weight of grain
193. 'Talus' is the soil transported by
- Wind
- Water
- Glacier
- Gravitational force
Correct answer: (D)
Gravitational force
194. Terzaghi's analysis assumes:
- Soil is homogeneous and isotropic
- Elastic zone has straight boundaries inclined at ψ = φ to the horizontal and plastic zones fully developed
- Failure zones do not extend above the horizontal plane through the base of the footing
- All the above
Correct answer: (D)
All the above
195. Terzaghi's bearing capacity factors Nc, Nq and Nr are functions of
- Cohesion only
- Angle of internal friction only
- Both cohesion and angle of internal friction
- None of the above
Correct answer: (B)
Angle of internal friction only
196. Terzaghi's theory of one dimensional consolidation assumes
- Load is applied in one direction
- Coefficient of permeability is constant
- Excess pore water drains out only in the vertical direction
- 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)
- tan (45° - φ)
- tan2 (45° + φ/2)
- tan2 (45° - φ/2)
- tan (45° + φ)
Correct answer: (C)
tan2 (45° - φ/2)
198. The admixture of coarser particles like sand or silt to clay causes
- Decrease in liquid limit and increase in plasticity index
- Decrease in liquid limit and no change in plasticity index
- Decrease in both liquid limit and plasticity index
- 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
- 90° + effective angle of shearing resistance
- 90° + half of the angle of shearing resistance
- 45° - half of the angle of shearing resistance
- 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
- angular-grained loose sand
- angular-grained dense sand
- round-grained dense sand
- round-grained loose sand
Correct answer: (B)
angular-grained dense sand