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Soil Mechanics and Foundation Engineering
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The soil which contains finest grain particles, is
silt
clay.
fine sand
coarse sand
When drainage is permitted under initially applied normal stress only and full primarily consolidation is allowed to take place, the test is known as
None of these.
drained test
quick test
consolidated undrained test
Pick up the in-correct statement from the following: The soils which contain montmorillonite minerals
possess high plasticity
None of these.
swell more when wet
possess high coefficient of internal coefficient
shrink more when dry
Darcy's law is applicable to seepage if a soil is
incompressible
All the above.
Isotropic
homogeneous
The earth pressure of a soil at rest, is proportional to (where φ is the angle of internal friction of the soil)
tan2 (45° - φ)
tan2 (45° + φ)
tan (45° + φ)
NONE OF THESE
tan (45° - φ)
For testing a saturated clay for shear strength, the test recommended, is
unconfined compression test
triaxial compression test
All the above.
direct shear test
260 g of wet soil was taken in a pycnometer jar of weight 400 g in order to find the moisture content in the soil, with specific gravity of soil particles 2.75. The weight of soil and remaining water filled in pycnometer without air bubbles was 1415 g and the weight of pycnometer filled with water alone was 1275 g. The moisture content in the soil is
53.8%
24.2%
18.2%
None of these.
Accurate determination of water content, is made by
oven-drying method.
calcium carbide method
sand bath method
alcohol method
Geologic cycle for the formation of soil, is
Weathering → transportation → deposition → upheaval
Upheavel → transportation → deposition → weathering
Transportation → upheaval → weathering → deposition
Weathering → upheaval → transportation → deposition
None of these.
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
0.01
0.05
0.02
0.001
Maximum size of clay particles, is
0.04 mm
1 mm
0.06 mm
0.002 mm
0.08 mm
The compressibility of clays, is caused due to
expulsion of double layer water from in between the grains
bending of particles as elastic sheets
All the above.
sliping of particles to new positions of greater density
If the cohesive force,
(c), is 1.5 t/m2, the density (γ) 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 the Â§lope, is
12 metres
8 metres
5 metres
10 metres
Back fill with a sloping surface exerts a total active pressure Pa on the wall of height H and acts at
H/2 above the base parallel to base
H/5 above the base parallel to base.
H/4 above the base parallel to base
H/3 above the base parallel to base
The shear strength of a soil
is proportional to the tangent of the angle of internal friction
is proportional to the cohesion of the soil
All the above.
is generally known as the strength of the soil
increases with an increase in the normal stress
The active earth pressure of a soil is proportional to (where φ is the angle of friction of the soil)
tan2 (45° - φ/2)
tan2 (45° + φ/2)
tan (45° - φ)
tan (45° + φ)
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
50 tonnes
100 tonnes
10 tonnes.
20 tonnes
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
None of these.
11.1%
69.6%
55.6%
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
None of these.
35%
65%
50%
Failure of the stability of slopes, generally occurs along
a curved surface
all the surfaces.
slip plane
a horizontal surface
1
2
6
11
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