Soil Mechanics and Foundation Engineering

71. Degree of saturation of a natural soil deposit having water content 15%, specific gravity 2.50 and void ratio 0.5, is

  1. 50 %
  2. 60 %
  3. 75 %
  4. 80 %

Correct answer: (C)
75 %

72. Depending upon the properties of a material, the failure envelope may

  1. Be either straight or curved
  2. Pass through the origin of stress
  3. Intersect the shear stress axis
  4. All the above

Correct answer: (D)
All the above

73. Determination of water content of a soil sample suspected to contain gypsum is made by drying the sample for longer period at a temperature not more than

  1. 60°C
  2. 80°C
  3. 100°C
  4. 110°C

Correct answer: (B)
80°C

74. Direct measurement of permeability of the specimen at any stage of loading can be made

  1. Only in fixed ring type consolidometer
  2. Only in floating ring type consolidometer
  3. Both (A) and (B)
  4. None of the above

Correct answer: (A)
Only in fixed ring type consolidometer

75. Dispersed type of soil structure is an arrangement comprising particles having

  1. Face to face or parallel orientation
  2. Edge to edge orientation
  3. Edge to face orientation
  4. All of the above

Correct answer: (A)
Face to face or parallel orientation

76. 'Drift' is the material picked up, mixed, disintegrated, transported and redeposited by

  1. Wind
  2. Gravitational force
  3. Glaciated water
  4. All the above

Correct answer: (C)
Glaciated water

77. Due to a rise in temperature, the viscosity and the unit weight of the percolating fluid are reduced to 60% and 90% respectively. If other things remain constant, the coefficient of permeability

  1. Increases by 25 %
  2. Increases by 50 %
  3. Increases by 33.3 %
  4. Decreases by 33.3 %

Correct answer: (B)
Increases by 50 %

78. During seepage through a soil, direction of seepage is always

  1. Parallel to equipotential lines
  2. Perpendicular to stream lines
  3. Perpendicular to equipotential lines
  4. None of these

Correct answer: (C)
Perpendicular to equipotential lines

79. During the first stage of triaxial test when the cell pressure is increased from 0.10 N/mm2 to 0.26 N/mm2, the pore water pressure increases from 0.07 N/mm2 to 0.15 N/mm2. Skempton's pore pressure parameter 'B' is

  1. 0.5
  2. -0.5
  3. 2
  4. -2

Correct answer: (A)
0.5

80. Effective stress is

  1. The stress at particles contact
  2. A physical parameter that can be measured
  3. Important because it is a function of engineering properties of soil
  4. All of the above

Correct answer: (C)
Important because it is a function of engineering properties of soil

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