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

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

View Answer

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

View Answer

Answer: directly proportional to time and inversely proportional to square of drainage path

63 Coefficient of consolidation of a soil is affected by

A compressibility

B permeability

C both compressibility and permeability

D none of the above

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer