71. Clay layer A with single drainage and coefficient of consolidation Cv takes 6 months to achieve 50% consolidation. The time taken by clay layer B of the same thickness with double drainage and coefficient of consolidation Cv/2 to achieve the same degree of consolidation is
a) 3 months
b) 6 months
c) 12 months
d) 24 months
Ans:a
72. Coefficient of consolidation for clays normally
a) decreases with increase in liquid limit
b) increases with increase in liquid limit
c) first increases and then decreases with increase in liquid limit
d) remains constant at all liquid limits
Ans:a
73. Direct measurement of permeability of the specimen at any stage of loading can be made
a) only in fixed ring type consolido-meter
b) only in floating ring type consolido-meter
c) both (a) and (b)
d) none of the above
Ans:a
74. Compressibility of sandy soils is
a) almost equal to that of clayey soils
b) much greater than that of clayey soils
c) much less than that of clayey soils
d) none of the above
Ans:c
75. Select the correct statement.
a) coefficient of compressibility of an over-consolidated clay is less than that of a normally consolidated clay
b) coefficient of compressibility of an over-consolidated clay is greater than that of a normally consolidated clay
c) coefficient of compressibility is cons-tant for any clay
d) none of the above
Ans:a
76. Coefficient of compressibility is
a) constant for any type of soil
b) different for different types of soils and also different for a soil under different states of consolidation
c) different for different types of soils but same for a soil under different states of consolidation
d) independent of type of soil but depends on the stress history of soil
Ans:b
77. The ultimate consolidation settlement of a structure resting on a soil
a) decreases with the increase in the initial voids ratio
b) decreases with the decrease in the plastic limit
c) increases with the increase in the initial voids ratio
d) increases with the decrease in the porosity of the soil
Ans:a
78. The ultimate consolidation settlement of a soil is
a) directly proportional to the voids ratio
b) directly proportional to the compression index
c) inversely proportional to the compression index
d) none of the above
Ans:b
79. A normally consolidated clay settled 10 mm when effective stress was increased from 100 kN/m2 to 200 kN/ m2. If the effective stress is further increased from 200 kN/ m2 to 400 kN/ m2, then the settlement of the same clay is
a) 10 mm
b) 20 mm
c) 40 mm
d) none of the above
Ans:a
80. Coarse grained soils are best compacted by a
a) drum roller
b) rubber tyres roller
c) sheep's foot roller
d) vibratory roller
Ans:d
a) 3 months
b) 6 months
c) 12 months
d) 24 months
Ans:a
72. Coefficient of consolidation for clays normally
a) decreases with increase in liquid limit
b) increases with increase in liquid limit
c) first increases and then decreases with increase in liquid limit
d) remains constant at all liquid limits
Ans:a
73. Direct measurement of permeability of the specimen at any stage of loading can be made
a) only in fixed ring type consolido-meter
b) only in floating ring type consolido-meter
c) both (a) and (b)
d) none of the above
Ans:a
74. Compressibility of sandy soils is
a) almost equal to that of clayey soils
b) much greater than that of clayey soils
c) much less than that of clayey soils
d) none of the above
Ans:c
75. Select the correct statement.
a) coefficient of compressibility of an over-consolidated clay is less than that of a normally consolidated clay
b) coefficient of compressibility of an over-consolidated clay is greater than that of a normally consolidated clay
c) coefficient of compressibility is cons-tant for any clay
d) none of the above
Ans:a
76. Coefficient of compressibility is
a) constant for any type of soil
b) different for different types of soils and also different for a soil under different states of consolidation
c) different for different types of soils but same for a soil under different states of consolidation
d) independent of type of soil but depends on the stress history of soil
Ans:b
77. The ultimate consolidation settlement of a structure resting on a soil
a) decreases with the increase in the initial voids ratio
b) decreases with the decrease in the plastic limit
c) increases with the increase in the initial voids ratio
d) increases with the decrease in the porosity of the soil
Ans:a
78. The ultimate consolidation settlement of a soil is
a) directly proportional to the voids ratio
b) directly proportional to the compression index
c) inversely proportional to the compression index
d) none of the above
Ans:b
79. A normally consolidated clay settled 10 mm when effective stress was increased from 100 kN/m2 to 200 kN/ m2. If the effective stress is further increased from 200 kN/ m2 to 400 kN/ m2, then the settlement of the same clay is
a) 10 mm
b) 20 mm
c) 40 mm
d) none of the above
Ans:a
80. Coarse grained soils are best compacted by a
a) drum roller
b) rubber tyres roller
c) sheep's foot roller
d) vibratory roller
Ans:d
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