Soil Mechanics and Foundation Engineering

221. The critical exist gradient of seepage water in soils, increases with

  1. An increase in specific gravity
  2. A decrease in specific gravity
  3. A decrease in void ratio
  4. Both (a) and (c)

Correct answer: (D)
Both (a) and (c)

222. The critical exist gradient of seepage water in soils, is

  1. Directly proportional to the voids ratio
  2. Inversely proportional to the specific gravity
  3. Directly proportional to the specific gravity
  4. None of these

Correct answer: (D)
None of these

223. The density of soil can be increased

  1. By reducing the space occupied by air
  2. By elastic compression of soil grains
  3. By expelling water from pores
  4. All the above

Correct answer: (D)
All the above

224. The direct shear test suffers from the following disadvantage:

  1. Drain condition cannot be controlled
  2. Pore water pressure cannot be measured
  3. Shear stress on the failure plane is not uniform
  4. The area under the shear and vertical loads does not remain constant throughout the test

Correct answer: (C)
Shear stress on the failure plane is not uniform

225. The earth pressure of a soil at rest, is proportional to (where φ is the angle of internal friction of the soil)

  1. tan (45° - φ)
  2. tan (45° + φ)
  3. tan2 (45° - φ)
  4. None of these

Correct answer: (D)
None of these

226. The effect of cohesion on a soil is to

  1. Reduce both the active earth pressure intensity and passive earth pressure intensity
  2. Increase both the active earth pressure intensity and passive earth pressure intensity
  3. Reduce the active earth pressure intensity but to increase the passive earth pressure intensity
  4. Increase the active earth pressure intensity but to reduce the passive earth pressure intensity

Correct answer: (C)
Reduce the active earth pressure intensity but to increase the passive earth pressure intensity

227. The effective size of particles of soil is denoted by

  1. D10
  2. D20
  3. D30
  4. D60

Correct answer: (A)
D10

228. The equation = C + is given by

  1. Rankine
  2. Coulomb
  3. Coleman
  4. Mohr

Correct answer: (B)
Coulomb

229. The expression [Gs/(1 + ωGs)] ρωis used for

  1. Dry density
  2. Bulk density
  3. Degree of saturation
  4. Optimum water content

Correct answer: (A)
Dry density

230. The factor which affects the compaction, is

  1. Moisture content
  2. Compacting content
  3. Method of compaction
  4. All the above

Correct answer: (D)
All the above

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