Soil Mechanics and Foundation Engineering

81. Effective stress on soil

  1. Increases voids ratio and decreases permeability
  2. Increases both voids ratio and permeability
  3. Decreases both voids ratio and permeability
  4. Decreases voids ratio and increases permeability

Correct answer: (C)
Decreases both voids ratio and permeability

82. Factor of safety against sliding of a slope, is the ratio of

  1. Actual cohesion to that required to maintain stability of slope
  2. Shear strength to shear stress along the surface
  3. Neither (a) nor (b)
  4. Both (a) and (b)

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

83. Failure of a slope occurs only when total shear force is

  1. Equal to total shearing strength
  2. Greater than total shearing strength
  3. Less than total shearing strength
  4. None of these

Correct answer: (B)
Greater than total shearing strength

84. Failure of the stability of slopes, generally occurs along

  1. Slip plane
  2. A horizontal surface
  3. A curved surface
  4. All the surfaces

Correct answer: (C)
A curved surface

85. Fine sand possesses

  1. Good plasticity
  2. Limited plasticity
  3. Reasonable plasticity
  4. Clay

Correct answer: (D)
Clay

86. Flow net is used for the determination of

  1. Quantity of seepage
  2. Hydrostatic pressure
  3. Seepage pressure
  4. All the above

Correct answer: (D)
All the above

87. For a base failure of a slope, depth factor

  1. Df = 1
  2. Df < 1
  3. Df > 1
  4. None of these

Correct answer: (C)
Df > 1

88. For a clay slope of height of 10 m, the stability number is 0.05, γ = 2.0 t/m3, C = 2.5 t/m2, the critical height of the slope of the soil, is

  1. 4.0 m
  2. 12.5 m
  3. 25.0 m
  4. 15.0 m

Correct answer: (C)
25.0 m

89. For a homogeneous earth dam 50 m high having 2 m free broad, a flow net was constructed and the results were : Number of potential drops = 2.4 Number of flow channels = 0.4. If co-efficiency of permeability of the dam material is 3 × 10-3 cm3/sec, the discharge per metre length of dam, is

  1. 12 × 10-5 m3/sec
  2. 24 × 10-3 m3/sec
  3. 6 × 10-5 m3/sec
  4. 24 × 10-5 m3/sec

Correct answer: (D)
24 × 10-5 m3/sec

90. For a loose sand sample and a dense sand sample consolidated to the same effective stress

  1. Ultimate strength is same and also peak strength is same
  2. Ultimate strength is different but peak strength is same
  3. Ultimate strength is same but peak strength of dense sand is greater than that of loose sand
  4. Ultimate strength is same but peak

Correct answer: (C)
Ultimate strength is same but peak strength of dense sand is greater than that of loose sand

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