Soil Mechanics and Foundation Engineering Quiz | Soil Mechanics and Foundation Engineering Multiple Choice Questions with Answers

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Questions
61 Time factor for a clay layer is
A a dimensional parameter
B directly proportional to permeability of soil
C inversely proportional to drainage path
D independent of thickness of clay layer

Answer: directly proportional to permeability of soil
62 Degree of consolidation is
A directly proportional to time and inversely proportional to drainage path
B directly proportional to time and inversely proportional to square of drainage path
C directly proportional to drainage path and inversely proportional to time
D directly proportional to square of drainage path and inversely proportional to time

Answer: directly proportional to time and inversely proportional to square of drainage path
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63 Coefficient of consolidation of a soil is affected by
A compressibility
B permeability
C both compressibility and permeability
D none of the above

Answer: both compressibility and permeability
64 Which one of the following clays behaves like a dense sand ?
A over-consolidated ciay with a high over-consolidation ratio
B over-consolidated clay with a low over-consolidation ratio
C normally consolidated clay
D under-consolidated clay

Answer: over-consolidated ciay with a high over-consolidation ratio
65 The value of compression index for a remoulded sample whose liquid limit is 50% is
A 0.028
B 0.28
C 0.36
D 0.036

Answer: 0.28
66 Within the consolidation process of a saturated clay
A a gradual increase in neutral pressure and a gradual decrease in effective pressure takes place and sum of the two is constant
B a gradual decrease in neutral pressure and a gradual increase in effective pressure takes place and sum of the two is constant
C both neutral pressure and effective pressure decrease
D both neutral pressure and effective pressure increase

Answer: a gradual decrease in neutral pressure and a gradual increase in effective pressure takes place and sum of the two is constant
67 The slope of isochrone at any point at a given time indicates the rate of change of
A effective stress with time
B effective stress with depth
C pore water pressure with depth
D pore water pressure with time

Answer: pore water pressure with depth
68 Total number of stress components at a point within a soil mass loaded at its boundary is
A 3
B 6
C 9
D 16

Answer: 9
69 The most suitable method for drainage of fine grained cohesive soils is
A well ppint system
B vacuum method
C deep well system
D electroosmosis method

Answer: electroosmosis method
70 The flownet for an earthen dam with 30 m water depth consists of 25 potential drops and 5 flow channels. The coefficient of permeability of dam material is 0.03 mm/sec. The discharge per meter length of dam is
A 0.00018 nrVsec
B 0.0045 m3/sec
C 0.18m3/sec
D 0.1125m3/sec

Answer: 0.00018 nrVsec
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

Answer: 3 months
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

Answer: decreases with increase in liquid limit
73 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

Answer: much less than that of clayey soils
74 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

Answer: coefficient of compressibility of an over-consolidated clay is less than that of a normally consolidated clay
75 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

Answer: different for different types of soils and also different for a soil under different states of consolidation
76 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

Answer: decreases with the increase in the initial voids ratio
77 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

Answer: directly proportional to the compression index
78 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

Answer: 10 mm
79 Coarse grained soils are best compacted by a
A drum roller
B rubber tyred roller
C sheep’s foot roller
D vibratory roller

Answer: vibratory roller
80 With the increase in the amount of compaction energy
A optimum water content increases but maximum dry density decreases
B optimum water content decreases but maximum dry density increases
C both optimum water content and maximum dry density increase
D both optimum water content and maximum dry density decrease

Answer: optimum water content decreases but maximum dry density increases
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