Ultimate 2026 ASBOG Exam Prep: 100+
Multiple-Choice Questions with Verified
Answers & Explanations||GRADED
A+||LATEST UPDATE
1. Which map symbol shows a contact between different rock types?
A. Anticline symbol
B. Strike and dip symbol
C. Solid line between formations
D. Contour line
Answer: C
Rationale: Contacts show boundaries between formations.
2. Strike and dip measurements describe:
A. Fossil orientation
B. Bedding plane attitude
C. Grain size
D. Rock density
Answer: B
Rationale: Strike is compass direction; dip is angle of inclination.
3. A topographic map’s contour lines that are close together indicate:
A. Flat terrain
B. Steep slope
C. Water body
D. Fault line
Answer: B
Rationale: Closely spaced contours = steep gradient.
4. Cross-section construction is used to interpret:
A. Rock age only
B. Subsurface geology
C. Weather patterns
D. Sediment grain size
Answer: B
Rationale: Cross-sections show subsurface relationships.
,5. Geological field notes should record:
A. Personal opinions only
B. Lithology, structures, location
C. Economic data only
D. Climate data
Answer: B
Rationale: Notes capture observed rock features and context.
DOMAIN B: MINERALOGY, PETROLOGY &
GEOCHEMISTRY
6. Quartz differs from feldspar primarily by:
A. Shape of crystals
B. Chemical composition
C. Density only
D. Color only
Answer: B
Rationale: Quartz = SiO₂; feldspars contain Al and other cations.
7. Which mineral group is characterized by double-chain silicate structures?
A. Olivine
B. Amphibole
C. Quartz
D. Calcite
Answer: B
Rationale: Amphiboles have double chains of silica tetrahedra.
8. Bowen’s Reaction Series is used to describe:
A. Fossil succession
B. Mineral crystallization order
C. Sediment transport
D. Soil profiles
Answer: B
Rationale: Shows sequence of crystallization from magma.
, 9. A high silica magma typically produces:
A. Basalt
B. Rhyolite
C. Peridotite
D. Gabbro
Answer: B
Rationale: Rhyolite = high silica, felsic composition.
10. Mineral hardness is measured using:
A. Mohs scale
B. Richter scale
C. Beaufort scale
D. pH scale
Answer: A
Rationale: Mohs scale ranks mineral hardness.
DOMAIN C: SEDIMENTOLOGY, STRATIGRAPHY &
PALEONTOLOGY
11. A graded bed indicates:
A. Uniform grain size
B. Change in grain size from bottom to top
C. Fossil presence only
D. Igneous intrusion
Answer: B
Rationale: Turbidity currents produce graded bedding.
12. Fossils used for correlating strata are typically:
A. Rare species
B. Index fossils
C. Igneous inclusions
D. Trace metals
Answer: B
Rationale: Index fossils are widespread and time-distinctive.
13. Lithification is the process of:
A. Weathering rocks
Multiple-Choice Questions with Verified
Answers & Explanations||GRADED
A+||LATEST UPDATE
1. Which map symbol shows a contact between different rock types?
A. Anticline symbol
B. Strike and dip symbol
C. Solid line between formations
D. Contour line
Answer: C
Rationale: Contacts show boundaries between formations.
2. Strike and dip measurements describe:
A. Fossil orientation
B. Bedding plane attitude
C. Grain size
D. Rock density
Answer: B
Rationale: Strike is compass direction; dip is angle of inclination.
3. A topographic map’s contour lines that are close together indicate:
A. Flat terrain
B. Steep slope
C. Water body
D. Fault line
Answer: B
Rationale: Closely spaced contours = steep gradient.
4. Cross-section construction is used to interpret:
A. Rock age only
B. Subsurface geology
C. Weather patterns
D. Sediment grain size
Answer: B
Rationale: Cross-sections show subsurface relationships.
,5. Geological field notes should record:
A. Personal opinions only
B. Lithology, structures, location
C. Economic data only
D. Climate data
Answer: B
Rationale: Notes capture observed rock features and context.
DOMAIN B: MINERALOGY, PETROLOGY &
GEOCHEMISTRY
6. Quartz differs from feldspar primarily by:
A. Shape of crystals
B. Chemical composition
C. Density only
D. Color only
Answer: B
Rationale: Quartz = SiO₂; feldspars contain Al and other cations.
7. Which mineral group is characterized by double-chain silicate structures?
A. Olivine
B. Amphibole
C. Quartz
D. Calcite
Answer: B
Rationale: Amphiboles have double chains of silica tetrahedra.
8. Bowen’s Reaction Series is used to describe:
A. Fossil succession
B. Mineral crystallization order
C. Sediment transport
D. Soil profiles
Answer: B
Rationale: Shows sequence of crystallization from magma.
, 9. A high silica magma typically produces:
A. Basalt
B. Rhyolite
C. Peridotite
D. Gabbro
Answer: B
Rationale: Rhyolite = high silica, felsic composition.
10. Mineral hardness is measured using:
A. Mohs scale
B. Richter scale
C. Beaufort scale
D. pH scale
Answer: A
Rationale: Mohs scale ranks mineral hardness.
DOMAIN C: SEDIMENTOLOGY, STRATIGRAPHY &
PALEONTOLOGY
11. A graded bed indicates:
A. Uniform grain size
B. Change in grain size from bottom to top
C. Fossil presence only
D. Igneous intrusion
Answer: B
Rationale: Turbidity currents produce graded bedding.
12. Fossils used for correlating strata are typically:
A. Rare species
B. Index fossils
C. Igneous inclusions
D. Trace metals
Answer: B
Rationale: Index fossils are widespread and time-distinctive.
13. Lithification is the process of:
A. Weathering rocks
