Soil Mechanics and Foundation Engineering

251. The maximum value of effective stress in the past divided by the present value is defined as over consolidation ratio (OCR). The O.C.R. of an over consolidated clay is

  1. Less than 1
  2. 1
  3. More than 1
  4. None of these

Correct answer: (C)
More than 1

252. The maximum water content at which a reduction in water content does not cause a decrease in volume of a soil mass, is known

  1. Liquid limit
  2. Plastic limit
  3. Shrinkage limit
  4. Permeability limit

Correct answer: (C)
Shrinkage limit

253. The method of the slices is applicable to

  1. Homogenous soils
  2. Stratified soils
  3. Saturated soils
  4. Non-uniform slopes

Correct answer: (A)
Homogenous soils

254. The minimum centre to centre distance of friction piles of 1 m diameter, is

  1. 2 m
  2. 2 m to 3 m
  3. 3 m to 4 m
  4. 5 m

Correct answer: (C)
3 m to 4 m

255. The minimum depth of building foundations on

  1. Sandy soils is 80 cm to 100 cm
  2. Clay soils is 90 cm to 160 cm
  3. Rocky soils is 5 cm to 50 cm
  4. All the above

Correct answer: (D)
All the above

256. The minimum water content at which the soil just begins to crumble when rolled into threads 3 mm in diameter, is known

  1. Liquid limit
  2. Plastic limit
  3. Shrinkage limit
  4. Permeability limit

Correct answer: (B)
Plastic limit

257. The minimum water content at which the soil retains its liquid state and also possesses a small shearing strength against flowing, is known

  1. Liquid limit
  2. Plastic limit
  3. Shrinkage limit
  4. Permeability limit

Correct answer: (A)
Liquid limit

258. The Mohr's straight theory is based on the following fact:

  1. Material fails essentially by shear
  2. Ultimate strength of the material is determined by the stress in the plane of slip
  3. Failure criterion is independent of the intermediate principal stress
  4. All the above

Correct answer: (D)
All the above

259. The most suitable method for drainage of fine grained cohesive soils is

  1. Well point system
  2. Vacuum method
  3. Deep well system
  4. Electro-osmosis method

Correct answer: (D)
Electro-osmosis method

260. The neutral stress in a soil mass is

  1. Force per neutral area
  2. Force per effective area
  3. Stress taken up by the pore water
  4. Stress taken up by solid particles

Correct answer: (C)
Stress taken up by the pore water

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