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Free download in PDF Geotechnical Engineering Multiple Choice Questions with Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
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
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
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
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
77
The clay mineral with the largest swelling and shrinkage characteristics is
[A]
montmorillonite
[B]
illite
[C]
kaolinite
[D]
none of the above
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
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
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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