ICC Soils Certification test questions and
answers 2025\2026 A+ Grade
well-graded, clean gravels; gravel-sand mixes
- correct answer GW
Poorly graded clean gravels; gravel-sand mixes
- correct answer GP
silty gravels; poorly graded gravel-sand mixes
- correct answer GM
Clayey gravels; poorly graded gravel-and-clay mixes
- correct answer GC
well graded clean sands; gravel-sand mixes
- correct answer SW
poorly graded clean sand; sand-gravel mixes
- correct answer SP
Silty sands; poorly graded sand-silt mixes
- correct answer SM
Sand-silt clay mix with plastic fines
- correct answer SM-SC
Clayey sands; poorly graded sand-clay mixes
- correct answer SC
,Inorganic silts and clayey silts
- correct answer ML
Mixture of inorganic silt and clay
- correct answer ML-CL
Inorganic clays of low to medium plasticity
- correct answer CL
Organic silts and silt clay, low plasticity
- correct answer OL
inorganic clayey silts, elastic silts
- correct answer MH
Inorganic clays of high plasticity
- correct answer CH
organic clays and silt clays
- correct answer OH
Types of slope stability
- correct answer Drainage
slope reduction or flattening
structural solutions
chemical stabilization
what would stabilize a slope that has been effected by seepage water? how does this improve slope
stability?
- correct answer Sub- drainage, decreases the saturation of the slope
, when a slope begins at vertical cut what is done to stabilize the slope?
- correct answer removing the upper portions or head of the slope or landslide is the frequently
employed technic for reducing the driving forces that cause the failure to occur
what are red lights on a site?
- correct answer low bearing capacity
settlement
existing uncontrolled fill
slope stability
dangerous seismic conditions
frost heave
constructabilty- piers or piles
proposed significate cut or fill
groundwater problems
foundation red lights
- correct answer design not in accordance with geotechnical recommendations
foundation location differs from site investigation location
foundation plans not adequate or complete
low bearing capacity not recognized in footing design
compressible or expansive soil on site not anticipated in design
water seepage not anticipated in design
seismic conditions not documented properly in design or calculations
answers 2025\2026 A+ Grade
well-graded, clean gravels; gravel-sand mixes
- correct answer GW
Poorly graded clean gravels; gravel-sand mixes
- correct answer GP
silty gravels; poorly graded gravel-sand mixes
- correct answer GM
Clayey gravels; poorly graded gravel-and-clay mixes
- correct answer GC
well graded clean sands; gravel-sand mixes
- correct answer SW
poorly graded clean sand; sand-gravel mixes
- correct answer SP
Silty sands; poorly graded sand-silt mixes
- correct answer SM
Sand-silt clay mix with plastic fines
- correct answer SM-SC
Clayey sands; poorly graded sand-clay mixes
- correct answer SC
,Inorganic silts and clayey silts
- correct answer ML
Mixture of inorganic silt and clay
- correct answer ML-CL
Inorganic clays of low to medium plasticity
- correct answer CL
Organic silts and silt clay, low plasticity
- correct answer OL
inorganic clayey silts, elastic silts
- correct answer MH
Inorganic clays of high plasticity
- correct answer CH
organic clays and silt clays
- correct answer OH
Types of slope stability
- correct answer Drainage
slope reduction or flattening
structural solutions
chemical stabilization
what would stabilize a slope that has been effected by seepage water? how does this improve slope
stability?
- correct answer Sub- drainage, decreases the saturation of the slope
, when a slope begins at vertical cut what is done to stabilize the slope?
- correct answer removing the upper portions or head of the slope or landslide is the frequently
employed technic for reducing the driving forces that cause the failure to occur
what are red lights on a site?
- correct answer low bearing capacity
settlement
existing uncontrolled fill
slope stability
dangerous seismic conditions
frost heave
constructabilty- piers or piles
proposed significate cut or fill
groundwater problems
foundation red lights
- correct answer design not in accordance with geotechnical recommendations
foundation location differs from site investigation location
foundation plans not adequate or complete
low bearing capacity not recognized in footing design
compressible or expansive soil on site not anticipated in design
water seepage not anticipated in design
seismic conditions not documented properly in design or calculations
