Cohesionless soil is
-
sand -
silt -
clay -
clay and silt.
For general engineering purposes, soils are classified by
-
particle size classification system -
textural classification system -
High Way Research Board (HRB), classification system -
unified soil classification system.
Pick up the correct statement from the following:
-
Coefficient of compressibility is the decrease in void ratio per unit increase of pressure -
The percent settlement at any time is called degree of consolidation -
Time factor is a dimensionless quantity -
The initial curve on either side of the point of unloading and reloading is called 'virgin curve' -
All the above.
Pick up the correct statement from the following:
-
The dry density reduces by addition of water after attaining optimum moisture content -
The line joining the peak of three moisture content graphs obtained by using three compactive energies, is called line of optimus -
Well graded coarse grained soils can be compacted to a very high density as compared to fine grained soils -
All the above. .
During seepage through a soil, direction of seepage is always
-
parallel to equipotential lines -
perpendicular to stream lines -
perpendicular to equipotential lines -
none of these.
The pressure that builds up in pore water due to load increment on the soil, is termed
-
excess pore pressure -
excess hydrostatic pressure -
hydrodynamic pressure -
all the above.
The coefficient ka of the active earth pressure, is given by
On wetting, cohesive soils,
-
loose permeability -
gain shear strength -
loose elasticity -
decrease their shear strength.
A phreatic line is defined as the line within a dam section below which there are
-
positive equipotential lines -
positive hydrostatic pressure -
negative hydrostatic pressure -
negative equipotential lines -
none of these.
An unsaturatedcm3 sample of soil weighsg. If its dried weight isg, water content of the soil, is
-
0.188 -
0.288 -
0.388 -
0.488 -
0.588
The shearing force acting along the slice of a curved surface of slippage, causes the soil to slide
-
down at the centre -
down at the toe -
upward at the centre -
none of these.
If there is no impervious boundary at the bottom of a hydraulic structure, stream lines tend to follow :
-
a straight line -
a parabola -
a semi-ellipse -
a semi-circle.
'Loess' is silty clay formed by the action of
-
water -
glacier -
wind -
gravitational force.
A suspended particle falls through a height H cm in water in t minutes. 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)
-
103M 
-
104M -
105M -
102M
The ratio of the difference between the void ratio of the soil in its loosest state and its natural void ratio (e) to the difference between the void ratios in the loosest and fully dense state, is generally termed as
-
degree of density -
relativity -
density index -
all the above.
The seepage exit gradient in a soil is the ratio of
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total head to the length of seepage -
flow line to slope -
head upstream to that at downstream -
head loss to the length of the seepage -
none of these.
The change of moisture content of soils, changes the
-
value of the angle of repose -
amount of compaction required -
cohesive strength of soil -
all the above.
The maximum possible value nf dry density is referred to as
-
dry density -
zero air voids -
saturation dry density -
all the above.
The pressure that builds up in pore water due to load increment on the soil, is termed
-
excess pore pressure -
excess hydrostatic pressure -
hydrodynamic pressure -
all the above.
The total active earth pressure due to dry back fill with no surcharge, acts at H/3 above the base of the wall and is directly proportional to
-
H 
-
-
H2 -
H3.
Pick up the correct statement from the following:
-
The property of a soil that enables it to become stiff in a relatively short time on standing is called thixotropy -
The ratio of shear strength in natural state to the remoulded shear strength under undrained conditions, is called degree of sensitivity. -
The difference between the undisturbed shear strength and remoulded shear strength is known remoulding loss -
The tendency of dense sand to expand on application of shearing load, is known as dilatancy -
All the above.
The maximum possible value nf dry density is referred to as
-
dry density -
zero air voids -
saturation dry density -
all the above.
According to the Indian Standards the specific gravity is the ratio of the unit weight of soil solids to that of water at a temperature of
-
17°C -
23°C -
27°C -
30°
According to Rankine's fromula, the minimum depth of foundation
The total active earth pressure due to dry back fill with no surcharge, acts at H/3 above the base of the wall and is directly proportional to
-
H
-
-
H2 -
H3.
The coefficient ka of the active earth pressure, is given by
The total active earth pressure due to dry back fill with no surcharge, acts at H/3 above the base of the wall and is directly proportional to
-
H
-
-
H2 -
H3.
If the natural moisture content, the liquid limit and plastic limit of a soil sample are stated as 30.5%, 42.and 22.respectively, the ratio of liquidity index and plastic index, is
-
-
-
2 
-
Pick up the correct statement from the following:
-
Illite bond is weaker than Kaolinite bond -
Illite bond is stronger than montmorillonite bond -
Illites do not swell when wet -
Illites are composed of two silica tetrahedralsheets with a central octahedral sheet -
All the above.
The maximum shear stress occurs on the filament which makes an angle with the horizontal plane equal to
-
30° -
45° -
60° -
90°