CALIFORNIA CERTIFIED ENGINEERING GEOLOGIST EXAM PRACTICE TEST QUESTIONS
AND CORRECT ANSWERS (VERIFIED ANSWERS) PLUS RATIONALES 2026 Q&A | INSTANT
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Core Domains
- Seismic Hazards and Fault Rupture Evaluation
*- Slope Stability and Landslide Assessment*
*- Soil and Rock Mechanics Principles*
*- Hydrogeology and Groundwater Management*
*- Geologic Mapping and Site Investigation*
*- California Regulatory Compliance and Legal Requirements*
*- Ethics and Professional Standards*
*- Liquefaction Analysis and Mitigation*
Introduction
This practice test prepares candidates for the California Certified Engineering Geologist (CEG) Examination,
a rigorous professional certification required for practicing engineering geology in California. The exam
assesses comprehensive skills in geological hazard evaluation, site characterization, and engineering
recommendations for civil projects. Questions are presented in multiple-choice and scenario-based formats
that emphasize real-world application, critical decision-making, and professional judgment under practical
field conditions. Candidates must demonstrate mastery of California-specific regulations, including the
Seismic Hazards Mapping Act, CGS Special Publications, and the Geologist and Geophysicist Act. The
assessment tests both foundational theory and applied professional knowledge necessary for protecting public
safety, property, and environmental quality in engineering geology practice.
,SECTION ONE: QUESTIONS 1–100
Question 1
According to CGS Special Publication 117A, Guidelines for Evaluating and Mitigating Seismic Hazards in
California, what is the lowest acceptable Factor of Safety in a liquefaction analysis?
A. 1
B. 1.1
C. 1.3
D. 1.5
🟢 C. 1.3
🔴 RATIONALE: CGS Special Publication 117A explicitly states that a Factor of Safety of 1.3 is the minimum
acceptable threshold for liquefaction analysis. This standard ensures adequate margin against seismic
liquefaction failure while accounting for uncertainties in soil properties and ground motion modeling.
Question 2
Field vane tests are most appropriate to provide an in-place measure of undrained shear strength for what type
of material?
A. Loose sand
B. Hard clay
C. Soft clay
D. Stiff silt
,🟢 C. Soft clay
🔴 RATIONALE: Field vane shear tests are specifically designed for soft to medium clays where the vane can
penetrate without excessive resistance. The test measures undrained shear strength (Su) directly in situ, making
it ideal for soft clay deposits where laboratory testing might disturb the sensitive soil structure.
Question 3
During a back cut excavation for a fill slope, a contractor unexpectedly encounters numerous springs. After
reevaluating the stability analysis, what should an engineering geologist recommend to the engineer?
A. A French drain above the back cut
B. Piezometers above the back cut
C. Horizontal drains into the back cut
D. A drainage blanket on the back cut
🟢 C. Horizontal drains into the back cut
🔴 RATIONALE: When springs are encountered during excavation, horizontal drains are the most effective
mitigation because they actively reduce pore water pressure within the slope mass. French drains and drainage
blankets are surface treatments that won't address deep groundwater, while piezometers are monitoring devices
rather than mitigation.
Question 4
The diagram depicts a shear strength typical of which of the following materials?
, A. Claystone
B. Sandstone
C. Fissured clay
D. Moderately fractured granite
🟢 C. Fissured clay
🔴 RATIONALE: Fissured clay exhibits a distinctive shear strength curve showing initial peak strength
followed by significant strain-softening to residual strength. This behavior results from the breakdown of
fissures and structural weakness within the clay matrix, unlike the more brittle failure of sandstone or granite.
Question 5
Which California agency oversees geological investigations and regulatory compliance and provides official
Seismic Hazard Zone maps and Earthquake Zones of Required Investigation?
A. California Department of Transportation
B. California Geological Survey (CGS)
C. California Environmental Protection Agency
D. United States Geological Survey
🟢 B. California Geological Survey (CGS)
🔴 RATIONALE: The California Geological Survey (CGS), part of the Department of Conservation, is the state
agency responsible for geological investigations, regulatory compliance, and producing official Seismic Hazard
Zone maps under the Seismic Hazards Mapping Act.
AND CORRECT ANSWERS (VERIFIED ANSWERS) PLUS RATIONALES 2026 Q&A | INSTANT
DOWNLOAD PDF
Core Domains
- Seismic Hazards and Fault Rupture Evaluation
*- Slope Stability and Landslide Assessment*
*- Soil and Rock Mechanics Principles*
*- Hydrogeology and Groundwater Management*
*- Geologic Mapping and Site Investigation*
*- California Regulatory Compliance and Legal Requirements*
*- Ethics and Professional Standards*
*- Liquefaction Analysis and Mitigation*
Introduction
This practice test prepares candidates for the California Certified Engineering Geologist (CEG) Examination,
a rigorous professional certification required for practicing engineering geology in California. The exam
assesses comprehensive skills in geological hazard evaluation, site characterization, and engineering
recommendations for civil projects. Questions are presented in multiple-choice and scenario-based formats
that emphasize real-world application, critical decision-making, and professional judgment under practical
field conditions. Candidates must demonstrate mastery of California-specific regulations, including the
Seismic Hazards Mapping Act, CGS Special Publications, and the Geologist and Geophysicist Act. The
assessment tests both foundational theory and applied professional knowledge necessary for protecting public
safety, property, and environmental quality in engineering geology practice.
,SECTION ONE: QUESTIONS 1–100
Question 1
According to CGS Special Publication 117A, Guidelines for Evaluating and Mitigating Seismic Hazards in
California, what is the lowest acceptable Factor of Safety in a liquefaction analysis?
A. 1
B. 1.1
C. 1.3
D. 1.5
🟢 C. 1.3
🔴 RATIONALE: CGS Special Publication 117A explicitly states that a Factor of Safety of 1.3 is the minimum
acceptable threshold for liquefaction analysis. This standard ensures adequate margin against seismic
liquefaction failure while accounting for uncertainties in soil properties and ground motion modeling.
Question 2
Field vane tests are most appropriate to provide an in-place measure of undrained shear strength for what type
of material?
A. Loose sand
B. Hard clay
C. Soft clay
D. Stiff silt
,🟢 C. Soft clay
🔴 RATIONALE: Field vane shear tests are specifically designed for soft to medium clays where the vane can
penetrate without excessive resistance. The test measures undrained shear strength (Su) directly in situ, making
it ideal for soft clay deposits where laboratory testing might disturb the sensitive soil structure.
Question 3
During a back cut excavation for a fill slope, a contractor unexpectedly encounters numerous springs. After
reevaluating the stability analysis, what should an engineering geologist recommend to the engineer?
A. A French drain above the back cut
B. Piezometers above the back cut
C. Horizontal drains into the back cut
D. A drainage blanket on the back cut
🟢 C. Horizontal drains into the back cut
🔴 RATIONALE: When springs are encountered during excavation, horizontal drains are the most effective
mitigation because they actively reduce pore water pressure within the slope mass. French drains and drainage
blankets are surface treatments that won't address deep groundwater, while piezometers are monitoring devices
rather than mitigation.
Question 4
The diagram depicts a shear strength typical of which of the following materials?
, A. Claystone
B. Sandstone
C. Fissured clay
D. Moderately fractured granite
🟢 C. Fissured clay
🔴 RATIONALE: Fissured clay exhibits a distinctive shear strength curve showing initial peak strength
followed by significant strain-softening to residual strength. This behavior results from the breakdown of
fissures and structural weakness within the clay matrix, unlike the more brittle failure of sandstone or granite.
Question 5
Which California agency oversees geological investigations and regulatory compliance and provides official
Seismic Hazard Zone maps and Earthquake Zones of Required Investigation?
A. California Department of Transportation
B. California Geological Survey (CGS)
C. California Environmental Protection Agency
D. United States Geological Survey
🟢 B. California Geological Survey (CGS)
🔴 RATIONALE: The California Geological Survey (CGS), part of the Department of Conservation, is the state
agency responsible for geological investigations, regulatory compliance, and producing official Seismic Hazard
Zone maps under the Seismic Hazards Mapping Act.
