Geotechnical Engineering MCQs | Geotechnical Engineering Multiple Choice Questions with Answers

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Questions
61 For better strength and stability, the fine grained soils and coarse grained soils are compacted respectively as
A wet of OMC and dry of OMC
B dry of OMC and wet of OMC
C wet of OMC and wet of OMC
D dry of OMC and dry of OMC where OMC is optimum moisture content

Answer: wet of OMC and dry of OMC
62 Select the incorrect statement.
A Effective angle of internal friction is a complicated function of mineralogy and clay size content
B Effective angle of internal friction for coarse grained soils is rarely below 30°
C Effective angle of internal friction for a soil increases as state of compact-ness increases
D Effective cohesion of a soil can never have a negative value

Answer: Effective cohesion of a soil can never have a negative value
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63 For a loose sand sample and a dense sand sample consolidated to the same effective stress
A ultimate strength is same but peak strength of dense sand is greater than that of loose sand
B ultimate strength is same and also peak strength is same
C ultimate strength is same but peak
D ultimate strength is different but peak strength is same

Answer: ultimate strength is same but peak strength of dense sand is greater than that of loose sand
64 The shear strength of a soil
A decreases with decrease in normal stress
B is directly proportional to the angle of internal friction of the soil
C is inversely proportional to the angle of internal friction of the soil
D decreases with increase in normal stress

Answer: decreases with decrease in normal stress
65 Shear strength of a soil is a unique function of
A total stress only
B effective stress only
C both effective stress and total stress
D none of the above

Answer: effective stress only
66 Select the incorrect statement. Effective angle of shearing resistance
A is limited to a maximum value of 45°
B increases as the soil gradation im-proves
C increases as the size of particles increases
D is rarely more than 30° for fine grained soil

Answer: is limited to a maximum value of 45°
67 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
A 0.05 N/mm2 and 0°
B 0.05 N/mm2 and 45°
C 0.5 N/mm2 and 30°
D none of the above

Answer: 0.05 N/mm2 and 0°
68 In the triaxial compression test, the application of additional axial stress (i.e. deviator stress) on the soil specimen produces shear stress on
A vertical plane only
B horizontal plane only
C both horizontal and vertical planes
D all planes except horizontal and vertical planes

Answer: all planes except horizontal and vertical planes
69 Rankine's theory of earth pressure assumes that the back of the wall is
A vertical and smooth
B plane and smooth
C vertical and rough
D None of the above

Answer: vertical and smooth
70 Terzaghi's bearing capacity factors Nc, Nq and Nr are functions of
A angle of internal friction only
B cohesion only
C both cohesion and angle of internal friction
D none of the above

Answer: angle of internal friction only
71 Residual soils are formed by
A water
B wind
C glaciers
D none of the above

Answer: none of the above
72 Water content of soil can
A be greater than 100 %
B be less than 0 %
C take values only from 0 % to 100 %
D never be greater than 100 %

Answer: be greater than 100 %
73 If the voids of a soil mass are full of air only, the soil is termed as
A dry soil
B air entrained soil
C partially saturated soil
D dehydrated soil

Answer: dry soil
74 The ratio of volume of voids to the total volume of soil mass is called
A porosity
B air content
C voids ratio
D percentage air voids

Answer: porosity
75 Stoke's law is valid only if the size of particle is
A between 0.2 mm and 0.0002 mm
B less than 0.0002 mm
C greater than 0.2 mm
D all of the above

Answer: between 0.2 mm and 0.0002 mm
76 If the plasticity index of a soil mass is zero, the soil is
A silt
B clayey silt
C sand
D none of the above

Answer: sand
77 The clay mineral with the largest swelling and shrinkage characteristics is
A montmorillonite
B illite
C kaolinite
D none of the above

Answer: montmorillonite
78 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 0.0045 m3/sec
B 0.1125m3/sec
C 0.00018 nrVsec
D None of the above

Answer: 0.00018 nrVsec
79 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 6 months
B 12 months
C 3 months
D none of the above

Answer: 3 months
80 Direct measurement of permeability of the specimen at any stage of loading can be made
A only in floating ring type consolido-meter
B only in fixed ring type consolido-meter
C both (A) and (B)
D none of the above

Answer: only in fixed ring type consolido-meter

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