Geotechnical Engineering Exam
Questions and Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. Which soil property primarily controls the compressibility of clay?
A. Grain size
B. Specific gravity
C. Plasticity index
D. Color
C
Higher plasticity index indicates greater clay activity and
compressibility.
2. The liquid limit of a soil is defined as the water content at which
the soil changes from:
A. Solid to semisolid
B. Semisolid to plastic
C. Plastic to liquid
D. Liquid to plastic
C
The liquid limit represents the boundary between plastic and
liquid states in Atterberg limits.
3. Darcy’s law is applicable under which flow condition?
A. Turbulent flow
B. Laminar flow
C. Cavitating flow
, D. Rapid drawdown
B
Darcy’s law assumes laminar flow conditions through porous
media.
4. The coefficient of consolidation primarily depends on:
A. Soil color
B. Void ratio and permeability
C. Specific gravity only
D. Grain shape only
B
Consolidation rate depends on permeability and compressibility
(void ratio characteristics).
5. Effective stress is defined as:
A. Total stress minus pore water pressure
B. Total stress plus pore water pressure
C. Pore water pressure minus total stress
D. Shear stress minus normal stress
A
Effective stress governs soil strength and equals total stress
minus pore pressure.
6. A soil with a uniformity coefficient (Cu) less than 4 is generally
considered:
A. Well graded
B. Gap graded
C. Poorly graded
D. Highly plastic
C
Low Cu indicates narrow particle size distribution, characteristic
of poorly graded soils.
, 7. The primary consolidation of clay is due to:
A. Rearrangement of sand grains
B. Expulsion of pore water
C. Chemical bonding
D. Evaporation
B
Primary consolidation occurs as excess pore water pressure
dissipates.
8. The Standard Penetration Test (SPT) measures:
A. Shear strength directly
B. Soil compressibility
C. Resistance to penetration
D. Permeability
C
SPT N-value reflects soil resistance to penetration.
9. The angle of internal friction is most significant in:
A. Saturated clays
B. Organic soils
C. Granular soils
D. Peats
C
Granular soils derive strength mainly from friction between
particles.
10. Capillary rise is highest in:
A. Coarse gravel
B. Fine sand
C. Clay
D. Silt
Questions and Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. Which soil property primarily controls the compressibility of clay?
A. Grain size
B. Specific gravity
C. Plasticity index
D. Color
C
Higher plasticity index indicates greater clay activity and
compressibility.
2. The liquid limit of a soil is defined as the water content at which
the soil changes from:
A. Solid to semisolid
B. Semisolid to plastic
C. Plastic to liquid
D. Liquid to plastic
C
The liquid limit represents the boundary between plastic and
liquid states in Atterberg limits.
3. Darcy’s law is applicable under which flow condition?
A. Turbulent flow
B. Laminar flow
C. Cavitating flow
, D. Rapid drawdown
B
Darcy’s law assumes laminar flow conditions through porous
media.
4. The coefficient of consolidation primarily depends on:
A. Soil color
B. Void ratio and permeability
C. Specific gravity only
D. Grain shape only
B
Consolidation rate depends on permeability and compressibility
(void ratio characteristics).
5. Effective stress is defined as:
A. Total stress minus pore water pressure
B. Total stress plus pore water pressure
C. Pore water pressure minus total stress
D. Shear stress minus normal stress
A
Effective stress governs soil strength and equals total stress
minus pore pressure.
6. A soil with a uniformity coefficient (Cu) less than 4 is generally
considered:
A. Well graded
B. Gap graded
C. Poorly graded
D. Highly plastic
C
Low Cu indicates narrow particle size distribution, characteristic
of poorly graded soils.
, 7. The primary consolidation of clay is due to:
A. Rearrangement of sand grains
B. Expulsion of pore water
C. Chemical bonding
D. Evaporation
B
Primary consolidation occurs as excess pore water pressure
dissipates.
8. The Standard Penetration Test (SPT) measures:
A. Shear strength directly
B. Soil compressibility
C. Resistance to penetration
D. Permeability
C
SPT N-value reflects soil resistance to penetration.
9. The angle of internal friction is most significant in:
A. Saturated clays
B. Organic soils
C. Granular soils
D. Peats
C
Granular soils derive strength mainly from friction between
particles.
10. Capillary rise is highest in:
A. Coarse gravel
B. Fine sand
C. Clay
D. Silt
