Theory

Question 1

If we increase the compaction energy, what will happen
to the max. dry density (MDD)?

Answer 1

The dry unit weight of soil will increase

Question 2

The ground water table is located at a certain depth
below the ground surface. This will cause an upward
seepage. What would be the resulting effective stress at a
certain point below the ground water table due to the
upward seepage.

Answer 2

This will cause the decrease of the effective stress at that
point

Question 3

What is the effect of compaction of soil:

Answer 3

Decrease the amount of settlement of structures

Question 4

When the moisture content is gradually increased and
the same compactive effort used for compaction.

Answer 4

It will increase the weight of the soil solids in a unit.

Question 5

When the moisture content increases, the hydraulic conductivity will

Answer 5

decrease

Question 6

The desirable backfill materials are those with _ suitability number

Answer 6

Smaller

Question 7

Settlement resulting from the compressibility of soil
varies depending on whether a soil is cohesionless or
cohesive. The rate of settlement of the structures supported
by cohesionless soils (such as sand and gravel).

Answer 7

Settlement will occur faster

Question 8

When soil is compressed, its volume is decreased. This
decrease in volume result to:

Answer 8

Reduction in void ratio

Question 9

if saturated soil is subjected to the weight of the building
and water is subsequently squeezed out or otherwise lost,
resulting soil compression can cause undue building
settlement. If water is added to the soil, soi expansion may
occur causing.

Answer 9

Building uplift

Question 10

For a soil in its densest condition; the void ratio is the
lowest the effect of the shear strength of the soil?

Answer 10

It exhibits the highest shear strength

Question 11

The shear strength for a non cohesive soil is:

Answer 11

Lesser than cohesive soil

Question 12

Principal stress occur on those planes.

Answer 12

where shearing stress is zero

Question 13

Compaction of soil increase its density, and produce
some effects such as:
a) increase in shear strength of the soil
b) decrease in settlement of soil
c) decrease its permeability
d) All of these

Answer 13

d) All of these

Question 14

Compaction of the subgrade of road pavement is
important in order to:

Answer 14

minimize or prevent settlement of pavement

Question 15

When the liquidity index is less than one it indicates
that the water content of that soil is.

Answer 15

less than the liquid limit

Question 16

A soil having a very low value of liquidity index near zero
indicates that the water content of the soil is:

Answer 16

near the plastic limit

Question 17

Which of the following factor affect the flow if a fluid
through a soil.
a) Pressure difference existing between the 2 points where
flow is occurring.
b) Density and viscosity of the fluid.
c) Size, shape and number of pore openings.
d) All of these

Answer 17

d) All of these

Question 18

Coefficient of permeability could be computed using
the following equation “
a) All of these
b) K
c) K = 10 (D10)²
d) K = 3.5 (D15)²
where:
q = volume of flow per unit time
¡= hydraulic gradient
A = cross sectional’ area of soil particles
D10 = is the 10 percent particle size from the grain size
distribution chart
D15 = is the 15 percent particle size from the grain size
distribution chart

Answer 18

a) All of these

Question 19

The formula for the compression index for
consolidation compression (for normally consolidated soil).
a) Cc = 0.009 (LL - 10)
b) Cc = 0.0054 (2.6 - 35)
c) Cc = 0.54 (eo - 0.35)
d) All of these

Answer 19

d) All of these

Question 20

Clays with high over consolidation ratio will cause the
clay to:

Answer 20

decrease its shear strength

Question 21

Foundations must be designed to satisfy the following
criteria:
a) They must be located properly both vertical and
horizontal orientation, So as not to adversely affected by
outside influences.
b) They must be safe from bearing capacity failure.
c) They must be safe from excessive settlement.
d) All of these

Answer 21

d) All of these

Question 22

Rankine theory for determining lateral earth pressure is
based on the assumption.
a) There is no adhesion or friction between the wall and soil.
b) Lateral pressure computed from Rankine theory are
limited to vertical walls and the resultant pressure are
assumed to act at a distance up from the base wall equal to
1/3, the vertical distance from the heel at the walls base to
the surface of the backfill.
c) Failure is assume to occur in the form of a sliding wedge
along an assumed failure plane defined as a function of the
soil angle of friction.
d) All of these

Answer 22

d) All of these

Question 23

Coulumbs theory for determining lateral earth pressure
is based on the assumption, a failure occurs in the form of a
wedge and that friction occurs between well and soil.
a) failure occurs in the form of a wedge and that friction
occurs between wall and soil.
b) Resultants active earth pressure acts on the wall at a
point where a line through the wedge’s center of gravity and
parallel to the failure plane intersecting the wall.
c) The resultants direction at the wall is along a line that
makes an angle equal to angle of wall friction, with the line
normal to the backside of the wall.
d). All of these

Answer 23

d) All of these