Quiznetik

Geotechnical Engineering | Set 3

1. A retaining wall 6m high supports a backfill with a surcharge angle of 10°. The back of the wall is inclined to the vertical at a positive batter angle of 5°. If the angle of wall friction is 7°, then the resultant active earth pressure will act at a distance of 2 m above the base and inclined to the horizontal at an angle of

Correct : C. 12°

2. The minimum water content at which the soil just begins to crumble when rolled into threads 3 mm in diameter, is known

Correct : B. Plastic limit

3. The minimum water content at which the soil retains its liquid state and also possesses a small shearing strength against flowing, is known

Correct : A. Liquid limit

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

Correct : C. Glaciated water

5. The ratio of volume of voids to the total volume of soil mass is called

Correct : B. Porosity

6. The ratio of the volume of voids to the volume of soil solids in a given soil mass, is known

Correct : C. Void ratio

7. The specific yield of soil depends upon

Correct : D. All the above

8. The hydrometer method of sedimentation analysis differs from the pipette analysis mainly in

Correct : B. The method of taking observations

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

Correct : C. 75 %

10. Cohesionless soil is

Correct : A. Sand

11. At liquid limit, all soils possess

Correct : A. Same shear strength of small magnitude

12. The ratio of the weight of given volume of soil solids to the weight of an equal volume of distilled water at the given temperature, is known

Correct : B. Specific gravity

13. If the water table rises upto ground surface, then the

Correct : B. Effective stress is reduced due to increase in pore water pressure only but total stress does not change

14. A coarse-grained soil has a voids ratio 0.75, and specific gravity as 2.75. The critical gradient at which quick sand condition occurs, is

Correct : D. 1.00

15. The shear strength of a soil

Correct : D. All the above

16. Total number of stress components at a point within a soil mass loaded at its boundary is

Correct : C. 9

17. The ratio of the undrained strength in the undrained state to the undrained strength, at the same water content, in the remoulded state, is called the sensivity of the clay. Its value for quick clays is

Correct : D. 20

18. The ultimate consolidation settlement of a soil is

Correct : B. Directly proportional to the compression index

19. The ratio of settlement at any time 't' to the final settlement, is known as

Correct : B. Degree of consolidation

20. Pick up the correct statement from the following:

Correct : C. In pipette analysis, weight Wd per ml of suspension is found directly

21. Unconfmed compressive strength test is

Correct : A. Undrained test

22. For shear strength, triaxial shear test is suitable because

Correct : D. All the above

23. The zero atmospheric pressure is at

Correct : D. Both (B) and (C) of the above

24. Terzaghi's bearing capacity factors Nc, Nq and Nr are functions of

Correct : B. Angle of internal friction only

25. 'Loess' is silty clay formed by the action of

Correct : C. Wind

26. Rise of water table in cohesion-less soils upto ground surface reduces the net ultimate bearing capacity approximately by

Correct : B. 50 %

27. A decrease in water content results in a reduction of the volume of a soil in

Correct : D. All of these

28. In non-cohesive soil in passive state of plastic equilibrium

Correct : B. Minor principal stress is vertical

29. A soil has a bulk density of 22 kN/m3 and water content 10 %. The dry density of soil is

Correct : B. 20.0 kN/m3

30. If the sand in-situ is in its densest state, then the relative density of sand is

Correct : B. 1

31. If dry density, water density and specific gravity of solids of a given soil sample are 1.6 g/cc, 1.84 g/cc and 2.56 respectively, the porosity of the soil sample, is

Correct : A. 0.375

32. The property of a soil which permits water to percolate through it, is called

Correct : B. Permeability

33. Toughness index is defined as the ratio of

Correct : B. Plasticity index to flow index

34. A moist soil sample of volume 60 cc. weighs 108 g and its dried weight is 86.4 g. If its absolute density is 2.52, the degree of saturation is

Correct : D. 84 %

35. The hydraulic head that would produce a quick condition in a sand stratum of thickness 1.5m, specific gravity 2.67 and voids ratio 0.67 is equal to

Correct : B. 1.5 m

36. The factor which affects the compaction, is

Correct : D. All the above

37. In a consolidated drained test on a normally consolidated clay, the volume of the soil sample during shear

Correct : A. Decreases

38. Pick up the correct statement from the following:

Correct : D. All the above

39. The maximum value of effective stress in the past divided by the present value is defined as over consolidation ratio (OCR). The O.C.R. of an over consolidated clay is

Correct : C. More than 1

40. A 300 mm square bearing plate settles by 15 mm in a plate load test on a cohesive soil when the intensity of loading is 0.2 N/mm². The settlement of a prototype shallow footing 1 m square under the same intensity of loading is

Correct : C. 50 mm

41. The effective size of particles of soil is denoted by

Correct : A. D10

42. If S, L and R are the arc length, long chord and radius of the sliding circle then the perpendicular distance of the line of the resultant cohesive force, is given by

Correct : A. a = S.R/ L

43. Uniformity coefficient of a soil is

Correct : D. Equal to or greater than 1

44. The fluid generally used for grouting is

Correct : D. All the above

45. The total and effective stresses at a depth of 5 m below the top level of water in a swimming pool are respectively

Correct : B. 0.5 kg/cm² and zero

46. Time factor for a clay layer is

Correct : B. Directly proportional to permeability of soil

47. The critical exist gradient of seepage water in soils, is

Correct : D. None of these

48. In the triaxial compression test, the application of additional axial stress (i.e. deviator stress) on the soil specimen produces shear stress on

Correct : D. All planes except horizontal and vertical planes

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

Correct : C. 25.0 m

50. Allowable bearing pressure for a foundation depends upon

Correct : C. Both allowable settlement and ultimate bearing capacity

51. Pick up the correct statement from the following:

Correct : D. All the above

52. Voids ratio of a soil mass can

Correct : C. Take any value greater than zero

53. If the cohesive force (c), is 1.5 t/m2, the density ) of the soil is 2.0 t/m3, factor of safety (F) is 1.5 and stability factor (Sn) is 0.05, the safe height of a slope is

Correct : C. 10 metres

54. If the plasticity index of a soil mass is zero, the soil is

Correct : A. Sand

55. Coulomb's wedge theory assumes that

Correct : D. All the above

56. 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

Correct : B. Increases by 50 %

57. Transporting and re-depositing soils, is done by

Correct : D. All the above

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

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

59. The void ratio of a soil sample decreases from 1.50 to 1.25 when the pressure is increased from 25 tonnes/m2 to 50 tonnes/m2, the coefficient of compressibility is

Correct : A. 0.01

60. The coefficient of active earth pressure for a loose sand having an angle of internal friction of 30° is

Correct : B. 3

61. If the degree of saturation of a partially saturated soil is 60%, then air content of the soil is

Correct : A. 40 %

62. Which one of the following statements is true?

Correct : D. All the above

63. According to IS classification, the range of silt size particles is

Correct : D. 0.075 mm to 0.002 mm

64. Pick up the clay soil group which does not swell when wet from the following:

Correct : B. Mite group

65. Coefficient of consolidation of a soil is affected by

Correct : C. Both compressibility and permeability

66. Pick up the correct statement from the following:

Correct : B. When water table is located somewhat below the base of a footing, the elastic wedge is partly of moist soil and partly of submerged soil, and a suitable reduction factor is used

67. Select the incorrect statement. Effective angle of shearing resistance

Correct : C. Is limited to a maximum value of 45°

68. The relationship between void ratio (e) and porosity ratio (n) is:

Correct : D. e = n/(1 - n)

69. Relative density of a compacted dense sand is approximately equal to

Correct : C. 0.95

70. Pick up the correct statement from the following:

Correct : D. All the above

71. Inorganic soils with low compressibility are represented by

Correct : C. ML

72. In a triaxial compression test when drainage is allowed during the first stage (i. e. application of cell pressure) only and not during the second stage (i.e. application of deviator stress at constant cell pressure), the test is known as

Correct : B. Consolidated undrained test

73. The specific gravity of quartz, is

Correct : A. 2.65

74. In hydrometer analysis for a soil mass

Correct : C. Meniscus correction is additive and dispersing agent correction is subtractive

75. The capillary rise of water

Correct : A. Depends upon the force responsible

76. The value of compression index for a remoulded sample whose liquid limit is 50% is

Correct : B. 0.28

77. Fine sand possesses

Correct : D. Clay

78. Coarse grained soils are best compacted by a

Correct : D. Vibratory roller

79. According to Atterberg, the soil is said to be of medium plasticity if the plasticity index PI is

Correct : B. 7< PI < 17

80. The coefficient of curvature for a well graded soil, must be between

Correct : B. 1.0 to 3.0

81. 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

Correct : A. 10 mm

82. The lateral earth pressure on a retaining wall

Correct : D. Proportional to the internal friction of the soil

83. If the permeability of a soil is 0.8 mm/sec, the type of soil is

Correct : B. Sand

84. A compacted soil sample using 10% moisture content has a weight of 200 g and mass unit weight of 2.0 g/cm3. If the specific gravity of soil particles and water are 2.7 and 1.0, the degree of saturation of the soil is

Correct : B. 55.6 %

85. Which of the following soils has more plasticity index?

Correct : C. Clay

86. The liquid limit and plastic limit exist in

Correct : D. Clay soils

87. For determining the moisture content of a soil sample, the following data is available Weight of container = 260 g, Weight of soil sample and = 320 g container, Weight of soil sample (dried) and = 310 g container. The moisture content of the soil sample, is

Correct : C. 20 %

88. 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

Correct : D. 24 × 10- 5 m3/sec

89. The soil which contains finest grain particles, is

Correct : D. Clay

90. The minimum centre to centre distance of friction piles of 1 m diameter, is

Correct : C. 3 m to 4 m

91. When drainage is permitted under initially applied normal stress only and full primarily consolidation is allowed to take place, the test is known as

Correct : C. Consolidated undrained test

92. The liquidity index is defined as a ratio expressed as percentage of

Correct : B. Natural water content minus its plastic limit to its plasticity index

93. Number of piles required to support a column, is

Correct : C. 3

94. According to the Indian Standards the specific gravity is the ratio of the unit weight of soil solids to that of water at a temperature of

Correct : C. 27°C

95. Maximum size of clay particles is:

Correct : A. 0.002 mm

96. The compression resulting from a long term static load and consequent escape of pore water, is known as

Correct : B. Consolidation

97. Minimum size of the particles of silt soil, is

Correct : A. 0.002 mm

98. The ultimate Settlement of a soil is directly proportional to:

Correct : D. None of these

99. A pile is being driven with a drop hammer weighing 1800 kg and having a free fall of 1.00 m. If the penetration with last blow is 5 mm, the load carrying capacity of the pile, -according to the Engineering News formula, is

Correct : D. 10 tonnes

100. Water formed transported soil is

Correct : D. Loess