California Certified Engineering Geologist (CEG) Exam –
Exam Practice Questions and Correct Answers (Verified
Answers) Plus Rationale 2026 Q&A | INSTANT DOWNLOAD
PDF
I. PROJECT PLANNING — Questions 1–18
1. Which activity is most appropriate during the preliminary project-planning phase of an
engineering geologic investigation?
A) Establishing a preliminary geologic model from available information
B) Performing final construction inspection
C) Installing permanent foundation anchors
D) Completing final as-built documentation
Correct Answer: A) Establishing a preliminary geologic model from available information
Rationale: A preliminary geologic model provides an initial conceptual understanding of geologic
conditions before detailed field investigation begins. It integrates existing maps, remote sensing,
historical information, and available site data. The model helps define uncertainties and determine
what additional investigation is necessary. Final construction inspection and permanent construction
activities occur later.
2. A proposed development is located downslope from an apparently old landslide. What should
the CEG do first?
A) Assume the landslide is inactive
B) Review available geologic, topographic, historical, and remote-sensing information
C) Immediately recommend retaining walls
D) Proceed directly to foundation design
Correct Answer: B) Review available geologic, topographic, historical, and remote-sensing
information
Rationale: Existing information should be evaluated before selecting detailed investigation methods
or mitigation. Historical aerial photographs, topographic maps, LiDAR, geologic maps, and site
reconnaissance can reveal landslide extent and activity. Assuming inactivity without evidence is
inappropriate. Engineering controls should be developed only after the geologic conditions and
potential failure mechanisms are adequately understood.
3. Which remote-sensing technology is particularly useful for detecting very small changes in
ground surface elevation over time?
A) Conventional compass surveying
B) Hand augering
C) InSAR
D) Rock core logging
,Correct Answer: C) InSAR
Rationale: Interferometric Synthetic Aperture Radar (InSAR) can detect small changes in ground-
surface position by comparing radar observations collected at different times. It is particularly useful
for identifying regional or site-specific deformation patterns. It does not replace field investigation,
because interpretation must account for vegetation, atmospheric effects, geometry, and other
limitations.
4. Why is historical land use important when planning an engineering geologic investigation?
A) It determines the exact future foundation type
B) It eliminates the need for laboratory testing
C) It guarantees that groundwater is contaminated
D) It may reveal undocumented fills, excavations, disposal areas, or altered drainage
Correct Answer: D) It may reveal undocumented fills, excavations, disposal areas, or altered
drainage
Rationale: Previous land use can significantly affect present subsurface conditions. Former grading,
industrial activities, waste disposal, quarrying, artificial fills, and altered drainage can create geologic
or environmental concerns that are not obvious from current surface conditions. Historical aerial
photographs, maps, records, and reconnaissance can help identify these potential conditions.
5. During reconnaissance, a site has extremely steep terrain and only one narrow access road.
What planning consideration is most important?
A) Ignore access because drilling can always be performed
B) Consider access limitations when selecting investigation methods and equipment
C) Eliminate all field investigations
D) Use only laboratory data
Correct Answer: B) Consider access limitations when selecting investigation methods and
equipment
Rationale: Site access directly affects the feasibility, safety, and cost of exploration. Large drilling
equipment may be unable to reach steep or constrained locations. The CEG should consider
alternative equipment, staging, access improvements, and safety requirements when developing the
investigation scope. Site reconnaissance specifically includes assessment of topography, access, and
hazards.
6. Which source would generally be most useful for evaluating historic changes in drainage
patterns at a developing site?
A) Historical aerial imagery
B) Concrete mix design
C) Foundation reinforcement schedule
D) Current building occupancy records
,Correct Answer: A) Historical aerial imagery
Rationale: Historical aerial photographs can document changes in drainage channels, grading,
vegetation, landslides, development, and other surface conditions. Comparing imagery from different
periods can reveal changes that are not apparent during present-day reconnaissance. Such
information contributes to development of the preliminary geologic model and identification of
potential geologic hazards.
7. What is the primary purpose of defining the scope of an engineering geologic investigation?
A) To guarantee that no unexpected conditions exist
B) To avoid coordination with other professionals
C) To identify investigations needed to characterize conditions relevant to the project
D) To replace the need for professional judgment
Correct Answer: C) To identify investigations needed to characterize conditions relevant to the
project
Rationale: Investigation scope should be tailored to project objectives, anticipated geologic
conditions, hazards, and uncertainties. A properly designed scope collects information necessary for
engineering decisions without arbitrarily collecting excessive or irrelevant data. It also requires
coordination with geotechnical engineers, civil engineers, environmental professionals, and other
appropriate disciplines.
8. A preliminary grading plan proposes a large cut into fractured bedrock. What should receive
early geologic attention?
A) Office furniture placement
B) Rock-mass structure and potential cut-slope stability
C) Interior paint selection
D) Building occupancy schedule
Correct Answer: B) Rock-mass structure and potential cut-slope stability
Rationale: Large bedrock cuts can be controlled by discontinuities such as joints, faults, bedding, and
shear zones. Their orientation, spacing, persistence, and strength influence potential planar, wedge,
or toppling failures. Evaluating these conditions during planning allows the geologist to determine
whether additional mapping, drilling, structural analysis, or stabilization assessment is necessary.
9. Which statement best describes the role of regulations during investigation planning?
A) Regulations should be considered only after construction
B) Regulations are relevant only to laboratory testing
C) Regulatory requirements can influence investigation methods, safety, permits, and reporting
D) Regulations are optional when a professional geologist is involved
Correct Answer: C) Regulatory requirements can influence investigation methods, safety, permits,
and reporting
, Rationale: Engineering geologic investigations may involve excavation, drilling, trenching,
groundwater work, environmental concerns, and construction activities subject to applicable laws
and regulations. Regulatory requirements should therefore be identified during planning. Professional
judgment does not eliminate statutory or regulatory obligations. The current CEG test plan
specifically includes applicable permitting, exploration, monitoring, testing, and reporting
requirements.
10. What is a major advantage of LiDAR during project planning?
A) It directly measures soil shear strength
B) It provides detailed surface topography useful for identifying geomorphic features
C) It replaces all field mapping
D) It directly measures groundwater pressure
Correct Answer: B) It provides detailed surface topography useful for identifying geomorphic
features
Rationale: LiDAR can produce high-resolution topographic information that helps identify scarps,
drainage features, landslide morphology, terraces, fault-related features, and other geomorphic
patterns. It does not directly measure material strength or pore pressure. Field verification remains
necessary because remotely sensed terrain models must be interpreted within their limitations.
11. Which situation most strongly indicates the need to investigate potential adverse historical site
use?
A) The site has never been developed
B) Aerial photographs show decades of industrial activity and possible fill placement
C) The site is covered by native vegetation
D) The project is located in a rural area
Correct Answer: B) Aerial photographs show decades of industrial activity and possible fill
placement
Rationale: Industrial activity and undocumented fill can significantly alter subsurface conditions.
Potential concerns include variable material properties, buried structures, altered drainage,
contamination, or unsuitable fill. Historical evidence should trigger appropriate follow-up
investigation. The absence of obvious present-day evidence does not eliminate concerns associated
with former site uses.
12. When evaluating a proposed surface-water impoundment, which issue is especially important?
A) Foundation and abutment geologic conditions
B) Interior architectural finishes
C) Electrical appliance selection
D) Landscaping color
Correct Answer: A) Foundation and abutment geologic conditions
Exam Practice Questions and Correct Answers (Verified
Answers) Plus Rationale 2026 Q&A | INSTANT DOWNLOAD
I. PROJECT PLANNING — Questions 1–18
1. Which activity is most appropriate during the preliminary project-planning phase of an
engineering geologic investigation?
A) Establishing a preliminary geologic model from available information
B) Performing final construction inspection
C) Installing permanent foundation anchors
D) Completing final as-built documentation
Correct Answer: A) Establishing a preliminary geologic model from available information
Rationale: A preliminary geologic model provides an initial conceptual understanding of geologic
conditions before detailed field investigation begins. It integrates existing maps, remote sensing,
historical information, and available site data. The model helps define uncertainties and determine
what additional investigation is necessary. Final construction inspection and permanent construction
activities occur later.
2. A proposed development is located downslope from an apparently old landslide. What should
the CEG do first?
A) Assume the landslide is inactive
B) Review available geologic, topographic, historical, and remote-sensing information
C) Immediately recommend retaining walls
D) Proceed directly to foundation design
Correct Answer: B) Review available geologic, topographic, historical, and remote-sensing
information
Rationale: Existing information should be evaluated before selecting detailed investigation methods
or mitigation. Historical aerial photographs, topographic maps, LiDAR, geologic maps, and site
reconnaissance can reveal landslide extent and activity. Assuming inactivity without evidence is
inappropriate. Engineering controls should be developed only after the geologic conditions and
potential failure mechanisms are adequately understood.
3. Which remote-sensing technology is particularly useful for detecting very small changes in
ground surface elevation over time?
A) Conventional compass surveying
B) Hand augering
C) InSAR
D) Rock core logging
,Correct Answer: C) InSAR
Rationale: Interferometric Synthetic Aperture Radar (InSAR) can detect small changes in ground-
surface position by comparing radar observations collected at different times. It is particularly useful
for identifying regional or site-specific deformation patterns. It does not replace field investigation,
because interpretation must account for vegetation, atmospheric effects, geometry, and other
limitations.
4. Why is historical land use important when planning an engineering geologic investigation?
A) It determines the exact future foundation type
B) It eliminates the need for laboratory testing
C) It guarantees that groundwater is contaminated
D) It may reveal undocumented fills, excavations, disposal areas, or altered drainage
Correct Answer: D) It may reveal undocumented fills, excavations, disposal areas, or altered
drainage
Rationale: Previous land use can significantly affect present subsurface conditions. Former grading,
industrial activities, waste disposal, quarrying, artificial fills, and altered drainage can create geologic
or environmental concerns that are not obvious from current surface conditions. Historical aerial
photographs, maps, records, and reconnaissance can help identify these potential conditions.
5. During reconnaissance, a site has extremely steep terrain and only one narrow access road.
What planning consideration is most important?
A) Ignore access because drilling can always be performed
B) Consider access limitations when selecting investigation methods and equipment
C) Eliminate all field investigations
D) Use only laboratory data
Correct Answer: B) Consider access limitations when selecting investigation methods and
equipment
Rationale: Site access directly affects the feasibility, safety, and cost of exploration. Large drilling
equipment may be unable to reach steep or constrained locations. The CEG should consider
alternative equipment, staging, access improvements, and safety requirements when developing the
investigation scope. Site reconnaissance specifically includes assessment of topography, access, and
hazards.
6. Which source would generally be most useful for evaluating historic changes in drainage
patterns at a developing site?
A) Historical aerial imagery
B) Concrete mix design
C) Foundation reinforcement schedule
D) Current building occupancy records
,Correct Answer: A) Historical aerial imagery
Rationale: Historical aerial photographs can document changes in drainage channels, grading,
vegetation, landslides, development, and other surface conditions. Comparing imagery from different
periods can reveal changes that are not apparent during present-day reconnaissance. Such
information contributes to development of the preliminary geologic model and identification of
potential geologic hazards.
7. What is the primary purpose of defining the scope of an engineering geologic investigation?
A) To guarantee that no unexpected conditions exist
B) To avoid coordination with other professionals
C) To identify investigations needed to characterize conditions relevant to the project
D) To replace the need for professional judgment
Correct Answer: C) To identify investigations needed to characterize conditions relevant to the
project
Rationale: Investigation scope should be tailored to project objectives, anticipated geologic
conditions, hazards, and uncertainties. A properly designed scope collects information necessary for
engineering decisions without arbitrarily collecting excessive or irrelevant data. It also requires
coordination with geotechnical engineers, civil engineers, environmental professionals, and other
appropriate disciplines.
8. A preliminary grading plan proposes a large cut into fractured bedrock. What should receive
early geologic attention?
A) Office furniture placement
B) Rock-mass structure and potential cut-slope stability
C) Interior paint selection
D) Building occupancy schedule
Correct Answer: B) Rock-mass structure and potential cut-slope stability
Rationale: Large bedrock cuts can be controlled by discontinuities such as joints, faults, bedding, and
shear zones. Their orientation, spacing, persistence, and strength influence potential planar, wedge,
or toppling failures. Evaluating these conditions during planning allows the geologist to determine
whether additional mapping, drilling, structural analysis, or stabilization assessment is necessary.
9. Which statement best describes the role of regulations during investigation planning?
A) Regulations should be considered only after construction
B) Regulations are relevant only to laboratory testing
C) Regulatory requirements can influence investigation methods, safety, permits, and reporting
D) Regulations are optional when a professional geologist is involved
Correct Answer: C) Regulatory requirements can influence investigation methods, safety, permits,
and reporting
, Rationale: Engineering geologic investigations may involve excavation, drilling, trenching,
groundwater work, environmental concerns, and construction activities subject to applicable laws
and regulations. Regulatory requirements should therefore be identified during planning. Professional
judgment does not eliminate statutory or regulatory obligations. The current CEG test plan
specifically includes applicable permitting, exploration, monitoring, testing, and reporting
requirements.
10. What is a major advantage of LiDAR during project planning?
A) It directly measures soil shear strength
B) It provides detailed surface topography useful for identifying geomorphic features
C) It replaces all field mapping
D) It directly measures groundwater pressure
Correct Answer: B) It provides detailed surface topography useful for identifying geomorphic
features
Rationale: LiDAR can produce high-resolution topographic information that helps identify scarps,
drainage features, landslide morphology, terraces, fault-related features, and other geomorphic
patterns. It does not directly measure material strength or pore pressure. Field verification remains
necessary because remotely sensed terrain models must be interpreted within their limitations.
11. Which situation most strongly indicates the need to investigate potential adverse historical site
use?
A) The site has never been developed
B) Aerial photographs show decades of industrial activity and possible fill placement
C) The site is covered by native vegetation
D) The project is located in a rural area
Correct Answer: B) Aerial photographs show decades of industrial activity and possible fill
placement
Rationale: Industrial activity and undocumented fill can significantly alter subsurface conditions.
Potential concerns include variable material properties, buried structures, altered drainage,
contamination, or unsuitable fill. Historical evidence should trigger appropriate follow-up
investigation. The absence of obvious present-day evidence does not eliminate concerns associated
with former site uses.
12. When evaluating a proposed surface-water impoundment, which issue is especially important?
A) Foundation and abutment geologic conditions
B) Interior architectural finishes
C) Electrical appliance selection
D) Landscaping color
Correct Answer: A) Foundation and abutment geologic conditions
