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Soil Mechanics and Foundation Engineering
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Let's practice 30 mcqs on
Soil Mechanics and Foundation Engineering
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The fundamental equation of specific gravity (G), dry density (γd), unit weight of water (γω) and void ratio
(e), is
G =
γd =
e =
γω =
A partially saturated soil is classified as
two phase soil
one phase soil
four phase soil.
three phase soil
Degree of saturation of a natural soil deposit having water content 15%, specific gravity 2.50 and void ratio 0.5, is
60%
80%
75%
50%
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 theclay.
Its value for quick clays is
8
4
16
20
12
The direct shear test suffers from the following disadvantage
All the above.
Shear stress on the failure plane is not uniform.
Pore water pressure cannot be measured
The area under the shear and vertical loads does not remain constant throughout the test
Drain condition cannot be controlled
The factor which affects the compaction, is
moisture content
method of compaction
compacting content
All the above.
Type of soil
A suspended particle falls through a height H cm in water in tminutes.
If the viscosity of water is η and specific gravity of the particle is G, the diameter of the particle is (where M is a constant factor)
104M
102M
103M
105m
An infinite slope is inclined at angle i and has its angle of internal friction φ, the stability number Sa, is
(tan i - tan φ) sin2 i
(tan i - tan φ) cos2 i
The bearing capacity of a soil depends upon
shape of the particles
size of the particles
All the above.
internal frictional resistance of particles
cohesive properties of particles
In a purely cohesive soil, the critical centre lies at the intersection of
directional angles
perpendicular drawn at l/3rd slope from toe and the locus of the centre
None of these.
perpendicular drawn at 2/3rd slope from toe and the locus of the centre
perpendicular bisector of slope and the locus of the centre
Pick up the correct statement applicable to plate load test
Width of the test pit for plate load test is made five times the width of the plate
All the above.
If water content of a soil is 40%, G is 2.70 and void ratio is 1.35, the degree of saturation is
90%
80%
75%
70%
85%
For general engineering purposes, soils are classified by
textural classification system
unified soil classification system.
particle size classification system
High Way Research Board (HRB), classification system
The minimum water content at which the soil just begins to crumble when rolled into threads 3 mm in diameter, is known
plastic limit
permeability limit.
shrinkage limit
liquid limit
The plasticity index is the numerical difference between
None of these.
plastic limit and shrinkage limit
liquid limit and plastic limit
liquid limit and shrinkage limit
If a soil undergoes a change in shape and volume by application of external loads over it, but recovers its shape and volume immediately after removal of the load, the property of the soil is said to be
Compressibility of soils
None of these.
Resilience of soils
Elasticity of soils
In a liquid limit test, the moisture content at 10 blows was 70% and that at 100 blows was 20%. The liquid limit of the soil, is
35%
50%
65%
None of these.
The shearing force acting along the slice of a curved surface of slippage, causes the soil to slide
down at the centre
None of these.
upward at the centre
down at the toe
Terzaghi's analysis assumes
soil is homogeneous and isotropic
All the above.
failure zones do not extend above the horizontal plane through the base of the footing
The maximum shear stress occurs on the filament which makes an angle with the horizontal plane equal to
90°
45°
60°
30°
On wetting, cohesive soils,
loose permeability
decrease their shear strength.
loose elasticity
gain shear strength
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
0.390
0.375
0.370
0.380
Sedimentation analysis is based on the assumption
walls of the jar do not affect the settlement .
All the above.
soil particles are spherical
particles settle independent of other particles
In non-cohesive soil in passive state of plastic equilibrium
minor and major principal stresses are equally inclined to the horizontal.
major principal stress is vertical
minor principal stress is vertical
major principal stress is horizontal
The specific yield of soil depends upon
compaction of stratum
distribution of pores
All the above.
shape and size of particles
When the seepage pressure becomes equal to the pressure due to submerged weight of a soil, the effective pressure is reduced to zero and the soil particles have a tendency to move up in the direction offlow.
This phenomenon is generally known
boiling condition
quick sand
All the above.
quick condition
In active state of plastic equilibrium in a non cohesive soil with horizontal ground surface
minor and major principal stresses are equally inclined to horizontal.
minor principal stress is vertical
major principal stress is horizontal
major principal stress is vertical
The compressibility of clays, is caused due to
sliping of particles to new positions of greater density
expulsion of double layer water from in between the grains
All the above.
bending of particles as elastic sheets
The angle of internal friction is maximum for
round-grained loose sand
round-grained dense sand
clays.
angular-grained dense sand
angular-grained loose sand
The Westergaard analysis is used for
clayey soils.
stratified soils
cohesive soils
Sandy Soils
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