Practice Soil Mechanics And Foundation Engineering Multiple Choice Questions with Answers Quiz-6

Q.1.

Failure of a slope occurs only when total shear force is

equal to total shearing strength
greater than total shearing strength
less than total shearing strength
none of these.

Q.2.

The inventor of the term soil mechanics, was

Kray
Dr. Karl Terzaghi
Leygue
Fellenius.

Q.3.

Sedimentation analysis is based on the assumption:

soil particles are spherical
particles settle independent of other particles
walls of the jar do not affect the settlement .
all the above.

Q.4.

Pick up the correct definition from the following:

The lateral pressure exerted by the soil when the retaining wall moves away from the back fill, is generally known as active earth pressure of the soil
The lateral pressure exerted by the soil when the retaining wail moves towards the soil, is generally known as 'Passive earth pressure of the soil'
The lateral pressure exerted by the soil when the retaining wall has no movement relative to the back fill, is known as 'earth pressure at rest of the soil'
All the above.

Q.5.

The length/diameter ratio of cylindrical specimens used in triaxial test, is generally

1
1.5
2
2.5
3

Q.6.

A plane inclined at an angle φ to the horizontal at which the soil is expected to stay in the absence of any lateral support, is known as

natural slope line
repose line
the φ line
all the above.

Q.7.

The critical exist gradient of seepage water in soils, increases with

an increase in specific gravity
a decrease in specific gravity
a decrease in void ratio
both (a) and (c)
none of these.

Q.8.

A soil sample of mass specific gravity 1.has a moisture content 30%. If the specific gravity of solids is 2.the void ratio, is

0.858
0.860
0.862
0.864

Q.9.

In a fow net

flow lines and equipotential lines cross each other at right angles
fields are rectangles whose length is twice the breadth
smaller the dimensions of the field, smaller will be the hydraulic gradient and velocity of flow through it
for homogeneous soil, the curves are smooth and circular.

Q.10.

A direct shear test possesses the following disadvantage:

A relatively thin thickness of sample permits quick drainage
A relatively thin thickness of sample permits quick dissipation of pore pressure developed during the test
As the test progresses the area under shear, gradually changes
none of these.

Q.11.

For a base failure of a slope, depth factor

Df = 1
Df < 1
Df > 1
none of these.

Q.12.

Pick up the correct statement from the following:

When stress decreases, void, ratio decreases
When stress decreases, coefficient of permeability decreases
When stress decreases, coefficient of volume change decreases
When stress decreases void ratio, co-effi-cients of per-meability and volume change decrease.

Q.13.

If voids ratio is 0.water content is 0.and specific gravity is 2.the degree of saturation of the soil, is

25%
40%
60%
75%

Q.14.

The intensity of active earth pressure at a depth ofmetres in dry cohesionless sand with an angle of internal friction ofand with a weight of 1.8 t/m³, is

4 t/m²
5 t/m²
6 t/m²
7 t/m²
8 t/m²

Q.15.

Hydrometer readings are corrected for:

temperature correction
meniscus correction
dispersing agent correction
meniscus and dispersing agent corrections
temperature, meniscus and dispersing agent corrections.

Q.16.

Pick up the correct statement from the following:

A soil having pH value more than 7 is an acidic soil
A soil having pH value less than 7 is an acidic soil
A soil having pH value more than 7 is an alkaline soil
A soil containing chemicals for the manufacture of portland cement is preferred.

Q.17.

Compression of soil occurs rapidly if voids are filled with

air
water
partly with air and partly with water
none of these.

Q.18.

The maximum pressure which a soil can carry without shear failure, is called

safe bearing capacity
net safe bearing capacity
net ultimate bearing capacity
ultimate bearing capacity.

Q.19.

Pick up the correct statement from the following:

The object of classifying soils is to arrange them into groups according to their properties and behaviour
A soil classification system is meant to provide an accepted and systematic method of describing the various types of soils eliminating personal factors
The first category of soil classification is based on grain size of the soil
The second category of soil classification is based on fine as well as coarse grains
All the above.

Q.20.

Pick up the correct statement from the following:

In hydrometer method, weight W_d per ml of suspension is found directly
In pipette analysis, weight W_d per ml of suspension is found indirectly
In pipette analysis, weight W_d per ml of suspension is found directly
None of these.

Q.21.

Tergazhi's theory of one dimensional consolidation assumes

load is applied in one direction
coefficient of permeability is constant
excess pore water drains out only in the vertical direction
time lag in consolidation is due entirely to permeability
all the above.

Q.22.

The ratio of the weight of water to the weight of solids in a given mass of soil, is known

porosity
specific gravity
void ratio
water content.

Q.23.

The ratio of the volume of water present in a given soil mass to the total volume of its voids, is known

porosity
void ratio
percentage voids
degree of saturation.

Q.24.

Through a point in a loaded soil mass, there exists n typical planes mutually orthogonal on which the stress is wholly normal and no shear stress acts, if n is

1
2
3
4

Q.25.

A critical hydraulic gradient may occur when

flow is in upward direction
seepage pressure is in upward direction
effective pressure is zero
all the above.

Q.26.

Chemical weathering of soil is caused due to

oxidation
carbonation
hydration
leaching
all the above.

Q.27.

If water content of a soil is 40%, G is 2.and void ratio is 1.the degree of saturation is

70%
75%
80%
85%
90%

Q.28.

On wetting, cohesive soils,

loose permeability
gain shear strength
loose elasticity
decrease their shear strength.

Q.29.

The compressibility of clays, is caused due to:

expulsion of double layer water from in between the grains
sliping of particles to new positions of greater density
bending of particles as elastic sheets
all the above.

Q.30.

Tergazhi's theory of one dimensional consolidation assumes

soil is homogeneous and fully saturated
water and soil particles are incompressible
deformation of the soil, is entirely due to change in volume
Darcey's law for the velocity of flow of water through soil, is perfectly valid
all the above.

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