soil mechanics and foundation engineering MCQs – Page 3

Practise focused soil mechanics and foundation engineering questions with marked answers for exam preparation and subject revision.

soil mechanics and foundation engineering Mcqs

41. Total number of stress components at a point within a soil mass loaded at its boundary is______________?
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A. 16

B. 3

C. 6

D. 9

42. Contact pressure beneath a rigid footing resting on cohesive soil is_________________?
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A. none of the above

B. less at edges compared to middle

C. more at edges compared to middle

D. uniform throughout

43. A cylindrical specimen of saturated soil failed under an axial vertical stress of 100kN/m2 when it was laterally unconfmed. The failure plane was inclined to the horizontal plane at an angle of 45. The values of cohesion and angle of internal friction for the soil are respectively______________________?
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A. 0.05 N/mm2 and 0

B. 0.2 N/mm2 and 0

C. 0.5 N/mm2 and 30

D. 0.05 N/mm2 and 45

44. Select the incorrect statement?
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A. Effective angle of internal friction for a soil increases as state of compact-ness increases

B. Effective cohesion of a soil can never have a negative value

C. Effective angle of internal friction for coarse grained soils is rarely below 30

D. Effective angle of internal friction is a complicated function of mineralogy and clay size content

45. Skemptons pore pressure coefficient B for saturated soil is________________?
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A. 1

B. greater than 1

C. between 0 and 1

D. zero

46. Toughness index is defined as the ratio of____________________?
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A. plasticity index to consistency index

B. plasticity index to flow index

C. liquidity index to flow index

D. consistency index to liquidity index

47. The total and effective stresses at a depth of 5 m below the top level of water in a swimming pool are respectively__________________?
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A. 0.5 kg/cm2 and zero

B. 1.0 kg/cm2 and 0.5 kg/cm2

C. zero and zero

D. 0.5 kg/cm2 and 0.5 kg/cm2

48. Water content of soil can______________?
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A. never be greater than 100 %

B. be greater than 100 %

C. be less than 0 %

D. take values only from 0 % to 100 %

49. Select the correct statement?
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A. A uniform soil has less strength and stability than a non-uniform soil

B. Uniformity coefficient of a poorly graded soil is more than that of a well graded soil

C. Uniformity coefficient does not affect strength and stability

D. A uniform soil has more strength and stability than a non-uniform soil

50. Stokes law is valid only if the size of particle is________________?
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A. less than 0.0002 mm

B. greater than 0.2 mm

C. between 0.2 mm and 0.0002 mm

D. all of the above

51. Valid range for S, the degree of saturation of soil in percentage is______________?
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A. 0 < S < 100

B. S<0

C. 0<S<100

D. S>0

52. If the water content of a fully saturated soil mass is 100%, then the voids ratio of the sample is________________?
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A. greater than specific gravity of soil

B. equal to specific gravity of soil

C. independent of specific gravity of soil

D. less than specific gravity of soil

53. Which of the following methods is most accurate for the determination of the water content of soil ?
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A. oven drying method

B. calcium carbide method

C. sand bath method

D. pycnometer method

54. Rise of water table above the ground surface causes________________?
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A. decrease in pore water pressure but increase in total stress

B. equal decrease in pore water pressure and total stress

C. equal increase in pore water pressure and total stress

D. increase in pore water pressure but decrease in total stress

55. For proper field control, which of the following methods is best suited for quick determination of water content of a soil mass ?
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A. sand bath method

B. calcium carbide method

C. oven drying method

D. alcohol method

56. Effective stress is______________?
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A. all of the above

B. the stress at particles contact

C. a physical parameter that can be measured

D. important because it is a function of engineering properties of soil

57. A soil has a bulk density of 22 kN/m3 and water content 10 %. The dry density of soil is_______________?
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A. 18.6 kN/m3

B. 20.0 kN/m3

C. 22.0 kN/m3

D. 23.2 kN/m3

58. For better strength and stability, the fine grained soils and coarse grained soils are compacted respectively as____________________?
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A. dry of OMC and wet of OMC

B. dry of OMC and dry of OMC where OMC is optimum moisture content

C. wet of OMC and wet of OMC

D. wet of OMC and dry of OMC

59. 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___________________?
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A. 167 mm

B. 30 mm

C. 15 mm

D. 50 mm

60. 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__________________?
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A. increases by 50%

B. decreases by 33.3%

C. increases by 25%

D. increases by 33.3%

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