Geotech_Refresher Flashcards
Ratio of volume of voids and volume of soil
Porosity (n)
Ratio of volume of voids and volume of soil solids
Void Ratio (e)
Ratio of volume of water and volume of voids
Degree of Saturation (S)
Which is true for porosity?
a. 0 < n < 100
b. 0 =< n =< 100
c. 0 =< n
d. 0 < n
a. 0 < n < 100
Which is true for void ratio?
a. 0 < e < 100
b. 0 =< e =< 100
c. 0 =< e
d. 0 < e
d. 0 < e
Which is true for degree of Saturation (S)?
a. 0 < S < 100
b. 0 =< S =< 100
c. 0 =< S
d. 0 < S
b. 0 =< S =< 100
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 of flow. This phenomenon is generally known
a. Quick Condition
b. Boiling Condition
c. Quick Sand
d. All of the above
d. All of the above
What is soil in civil engineering?
a. the material in a relatively thin surface zone within roots occur.
b. the unaggregated and uncemented deposits of minerals and organic particles covering the earth’s crust.
c. the substance existing on the earth’s surface; which grows and develop plants.
d. None of the above
b. the unaggregated and uncemented deposits of minerals and organic particles covering the earth’s crust.
A process by which water-saturated soil sediment temporarily loss strength and acts as a fluid.
A. Consolidation
C. Settlement
B. Plasticity
D. Liquefaction
D. Liquefaction
Volume change in saturated soils caused by the expulsion of pore water from loading?
A. Initial Consolidation
B. Primary Consolidation
C. Secondary Consolidation
D. None of the above
B. Primary Consolidation
Negative skin friction on piles..
A. Is caused due to relative settlement of the soil
B. Is caused in soft clays
C. Decreases the pile capacity
D. All of the above
D. All of the above
For better strength and stability, the fine grained soils and coarse grained soils are compacted respectively as
A. Dry of OMC and wet of OMC
B. Wet of OMC and dry of OMC
C. Wet of OMC and wet of OMC
D. Dry of OMC and dry of OMC
B. Wet of OMC and dry of OMC
Pick up the incorrect statement from the following:
A. Compaction has no effect on the structure of a soil
B. Permeability decreases with increase in the dry density of a compacted soil
C. A wet side compacted soil is more compressible than a dry side compacted soil
D. Dry side compaction soils swell more when give access to moisture
A. Compaction has no effect on the structure of a soil
A decrease in water content results in a reduction of the volume of soil in:
A. Liquid state
B. Plastic state
C. Semi-solid state
D. All of these
D. All of these
The water content in a soil sample when it continues to loose weight without loosing the volume, is called
A. Shrinkage limit
B. Plastic limit
C. Liquid limit
D. Semi-solid limit
A. Shrinkage limit
The admixture of coarser particles like sand or silt to clay causes
A. Decrease in liquid limit and increase in plasticity index
B. Decrease in liquid limit and no change in plasticity index
C. Decrease in both liquid limit and plasticity index
D. Increase in both liquid limit and plasticity index
C. Decrease in both liquid limit and plasticity index
A cohesive soil deposit is considered
stiff if the unconfined compression strength, in kPa, is between
A. 0 to 25
B. 50 to 100
C. 100 to 200
D. 25 to 50
C. 100 to 200
A cohesive soil deposit is considered soft if the unconfined compression strength, in kPa, is between
A. 0 to 25
B. 50 to 100
C. 100 to 200
D. 25 to 50
D. 25 to 50
A cohesive soil deposit is considered very soft if the unconfined compression strength, in kPa, is between
A. 0 to 25
B. 50 to 100
C. 100 to 200
D. 25 to 50
A. 0 to 25
Rise of water table above the ground surface causes:
A. Equal increase in pore water pressure and total stress
B. Equal decrease in pore water pressure and total stress
C. Increase in pore water pressure but decrease in total stress
D. Decrease in pore water pressure but increase in total stress
A. Equal increase in pore water pressure and total stress
The shear strength of a soil:
A. Is directly proportional to the angle of internal friction of the soil
B. Is inversely proportional to the angle of internal friction of the soil
C. Decreases with increase in normal stress
D. Decreases with decrease in normal stress
D. Decreases with decrease in normal stress
Effective stress on soil:
A. Increases voids ratio and decreases permeability
B. Increases both voids ratio and permeability
C. Decreases both voids ratio and permeability
D. Decreases voids ratio and increases permeability
C. Decreases both voids ratio and permeability
The coefficient of compressibility of
soil, is the ratio of:
A. Stress to strain
B. Strain to stress
C. Stress to settlement
D. Rate of loading to that of settlement
B. Strain to stress
If the ground water table in the soil formation rises as a resulting of flooding, the bearing capacity of the soil
A. increases
B. unaffected
C. decreasing
D. depends on the footing load
C. decreasing
One of the following foundation conditions does not affect the bearing capacity of the supporting soil
A. Unit weight of the soil
B. depth of founding of footings
C. Load imposed onto the soil
D. Position of ground water table
C. Load imposed onto the soil
- What is the largest grain that passes a no. 200 sieve in millimeter?
A. 0.020
B. 0.064
C. 0.074
D. 0.0054
C. 0.074
Section 302.2.2 of the National Structural Code of the Philippines provides that the slope of cut surfaces of the ground shall be no steeper than is safe for the intended use and shall be no steeper that:
A. 1 to 3
B. 1 to 2
C. 1 to 1
D. 1 to 1.5
B. 1 to 2
The fraction of soils passing which sieve number is used for Atterberg Limits tests of soils:
A. 60
B. 30
C. 50
D. 40
D. 40
Coefficient of Consolidation is affected by
A. Compressibility
B.Permeability
C. Both Compressibility and Permeability
D. None
C. Both Compressibility and Permeability
If the sand in-situ is in its densest state, then the relative density of sand is
A. Zero
B. 1
C. Between 0 to 1
D. Greater than 1
B. 1
Water content of soil can
A. Never be greater than 100%
B. Take Values only from 0% to 100%
C. Be less than 0%
D. Be greater than 100%
D. Be greater than 100%
An index used to identify the swelling potential of clay soils is called
A. Plasticity Index
B. Liquidity Index
C. Consistency Index
D. Activity
D. Activity
The property of a soil which permits water to percolate through it
A. Moisture content
B. Permeability
C. Capillarity
D. None of these
B. Permeability
Which of the following methods is best suited for determination of permeability of coarse-grained soils?
A. Constant head method
B. Falling head method
C. Both the above
D. None of the above
A. Constant head method
Terzaghi’s bearing capacity factors Nc, Nq and Nγ are functions of
A. Cohesion only
B. Angle of internal friction only
C. Both cohesion and angle of internal friction
D. None of the above
B. Angle of internal friction only
Coefficient of earth pressure at rest is
A. Less than active earth pressure but greater than passive earth pressure
B. Greater than active earth pressure but less than passive earth pressure
C. Greater than both the active earth pressure and passive earth pressure
D. Less than both the active and passive earth pressures
B. Greater than active earth pressure but less than passive earth pressure
The average coefficient of permeability of natural deposits
A. Parallel to stratification is always greater than that perpendicular to stratification
B. Parallel to stratification is always less than that perpendicular to stratification
C. Is always same in both directions
D. Parallel to stratification may or may not be greater than that perpendicular to stratification
A. Parallel to stratification is always greater than that perpendicular to stratification
The quantity of seepage of water through soils is proportional to
A. Coefficient of permeability of soil
B. Total head loss through the soil
C. Neither A nor B
D. Both A and B
D. Both A and B
The critical exit gradient of seepage water in soils, increases with
A. An increase in specific gravity
B. A decrease in specific gravity
C. A decrease in void ratio
D. Both A and C
D. Both A and C
Who is the father of modern soil mechanics?
A. K. Terzaghi
B. R. Peck
C. W. Rankine
D. K. Policarpio
A. K. Terzaghi
Water content of soil can
A. Never be greater than 100%
B. Take values only from 0% to 100%
C. Be less than 0%
D. Be greater than 100%
D. Be greater than 100%
The shearing strength of a cohesive soil is:
A. Proportional to the angle of shearing resistance
B. Inversely proportional to the angle of shearing resistance
C. Proportional to the tangent of the angle of shearing resistance
D. Inversely proportional to the tangent of the angle of shearing resistance
C. Proportional to the tangent of the angle of shearing resistance
The intensity of vertical stress, σ at a depth due to a point load acting on a surface of a semi infinite elastic soil mass is:
A. Directly proportional to the depth
B. Inversely proportional to the depth
C. Directly proportional to the square of the depth
D. Inversely proportional to the square of the depth
D. Inversely proportional to the square of the depth
Water is densest at a temperature of
A. 32° 𝐂
B. 4 ° 𝐂
C. 0° 𝐂
D. 100° 𝐂
B. 4 ° 𝐂
