Soil Mechanics and Foundation Engineering

181. Select the correct statement.

  1. Unit weight of dry soil is greater than unit weight of wet soil
  2. For dry soils, dry unit weight is less than total unit weight
  3. Unit weight of soil increases due to submergence in water
  4. Unit weight of soil decreases due to submergence in water

Correct answer: (D)
Unit weight of soil decreases due to submergence in water

182. Select the incorrect statement.

  1. In a direct shear box test, the plane of shear failure is predetermined
  2. Better control is achieved on the drainage of the soil in a triaxial compression test
  3. Stress distribution on the failure plane in the case of triaxial compression test is uniform
  4. Unconfined compression test can be carried out on all types of soils

Correct answer: (D)
Unconfined compression test can be carried out on all types of soils

183. Select the incorrect statement. Effective angle of shearing resistance

  1. Increases as the size of particles increases
  2. Increases as the soil gradation improves
  3. Is limited to a maximum value of 45°
  4. Is rarely more than 30° for fine grained soil

Correct answer: (C)
Is limited to a maximum value of 45°

184. Sensitivity of a soil can be defined as

  1. Percentage of volume change of soil under saturated condition
  2. Ratio of compressive strength of unconfined undisturbed soil to that of soil in a remoulded state
  3. Ratio of volume of voids to volume of solids
  4. None of the above

Correct answer: (B)
Ratio of compressive strength of unconfined undisturbed soil to that of soil in a remoulded state

185. Shear strength of a soil is a unique function of

  1. Effective stress only
  2. Total stress only
  3. Both effective stress and total stress
  4. None of the above

Correct answer: (A)
Effective stress only

186. Si particles

  1. Show dilatancy
  2. Swell when moist
  3. Possess high strength when dry
  4. Disintegrate easily

Correct answer: (A)
Show dilatancy

187. Skempton's pore pressure coefficient B for saturated soil is

  1. 1
  2. Zero
  3. Between 0 and 1
  4. Greater than 1

Correct answer: (A)
1

188. Soil classification of composite soils, exclusively based on the particle size distribution, is known

  1. Particle classification
  2. Textural classification
  3. High Way Research Board classification
  4. Unified soil classification

Correct answer: (B)
Textural classification

189. Soils containing organic matters

  1. Are of spongy nature
  2. Swell with decrease of moisture
  3. Shrink with increase of moisture content
  4. None of these

Correct answer: (A)
Are of spongy nature

190. Stoke's law does not hold good if the size of particle is smaller than

  1. 0.0002 mm
  2. 0.002 mm
  3. 0.02 mm
  4. 0.2 mm

Correct answer: (A)
0.0002 mm

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