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100+ Free PRC Geologist Practice Questions

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Key Facts: PRC Geologist Exam

100

Practice Questions

GLE Prep

3 Days

Exam Duration

PRC Board of Geology

70%

Passing GWA

R.A. 10166

50%

Minimum Subject Score

PRC Rules

PHP 900

Application Fee

PRC Portal

Annual

Exam Frequency

PRC Calendar

The PRC Geologist Board Exam is a rigorous 3-day licensure exam. Passing requires a General Weighted Average (GWA) of at least 70% with no score below 50% in any individual subject. It tests a candidate's mastery of the geology of the Philippines, mineral chemistry, crystallography, structural mapping, economic deposits, and geotechnical/geophysical engineering.

Sample PRC Geologist Practice Questions

Try these sample questions to test your PRC Geologist exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which plate tectonic feature bounds the eastern margin of the Philippine Mobile Belt, representing the subduction of the Philippine Sea Plate?
A.Manila Trench
B.Philippine Trench
C.Cotabato Trench
D.Sulu Trench
Explanation: The Philippine Trench is a major subduction zone located along the eastern boundary of the Philippine Mobile Belt. It accommodates the westward subduction of the oceanic Philippine Sea Plate beneath the island arc complex of the Philippines. This active subduction process is responsible for the deep-seated seismicity and volcanic arc chain in the eastern part of the archipelago.
2The Manila Trench is characterized by which of the following tectonic configurations?
A.Eastward subduction of the Eurasian Plate beneath the Philippine Mobile Belt
B.Westward subduction of the Philippine Sea Plate beneath the Eurasian Plate
C.Left-lateral transform motion between Luzon and Taiwan
D.Continental collision between the Palawan Block and Mindoro
Explanation: The Manila Trench is located west of Luzon and represents the eastward subduction of the Eurasian Plate (specifically the oceanic crust of the South China Sea basin) beneath the western margin of the Philippine Mobile Belt. This subduction gives rise to the Luzon Volcanic Arc, which includes Mount Pinatubo. This active convergent boundary plays a critical role in the western tectonic framework of Northern Philippines.
3What is the total approximate length and dominant sense of motion of the Philippine Fault Zone (PFZ)?
A.500 km, right-lateral strike-slip
B.1,200 km, left-lateral strike-slip
C.800 km, normal dip-slip
D.1,500 km, right-lateral strike-slip
Explanation: The Philippine Fault Zone (PFZ) is a major active left-lateral strike-slip fault system that traverses the entire length of the Philippine archipelago, from northwestern Luzon to southeastern Mindanao, spanning approximately 1,200 kilometers. It accommodates the oblique convergence between the Philippine Sea Plate and the Eurasian Plate. The PFZ is responsible for numerous destructive historical earthquakes, including the 1990 Luzon earthquake.
4Which ophiolite complex in the Philippines represents one of the most complete and widely studied slice of ancient oceanic lithosphere in the western Pacific?
A.Angat Ophiolite
B.Zambales Ophiolite Complex
C.Antique Ophiolite
D.Leyte Ophiolite
Explanation: The Zambales Ophiolite Complex (ZOC) in western Luzon is the most complete and extensively studied ophiolite suite in the Philippines. It exhibits a classic vertical sequence of oceanic lithosphere: residual mantle peridotites, layered gabbros, sheeted dikes, pillow basalts, and overlying pelagic sediments. The ZOC is divided into the Acoje block (island-arc affinity) and the Coto block (mid-oceanic ridge affinity) and hosts massive podiform chromite deposits.
5In the geologic time scale, which of the following is a geochronologic unit rather than a chronostratigraphic unit?
A.System
B.Period
C.Erathem
D.Series
Explanation: A Period is a geochronologic unit, which refers purely to a division of geologic time (e.g., the Cretaceous Period). In contrast, chronostratigraphic units represent the actual physical rock bodies deposited during that specific interval of time. The chronostratigraphic equivalent of a Period is a System (e.g., the Cretaceous System). Similarly, Erathem is the rock equivalent of an Era, and Series is the rock equivalent of an Epoch.
6Which stratigraphic principle states that in an undisturbed sequence of sedimentary rocks, each layer is older than the one above it and younger than the one below it?
A.Principle of Original Horizontality
B.Principle of Superposition
C.Principle of Lateral Continuity
D.Principle of Cross-Cutting Relationships
Explanation: The Principle of Superposition, formulated by Nicolas Steno in 1669, is a fundamental law of geology stating that within a sequence of undisturbed sedimentary rocks or lava flows, the oldest layer is at the bottom and the layers become progressively younger upward. This principle forms the basis for relative age dating and stratigraphic correlation. It allows geologists to establish chronological sequences of events in field mapping.
7What type of unconformity is characterized by an erosion surface separating younger horizontal sedimentary strata from older, tilted or folded sedimentary rocks?
A.Disconformity
B.Angular Unconformity
C.Nonconformity
D.Paraconformity
Explanation: An angular unconformity occurs where younger, flatter sedimentary layers are deposited over older sedimentary rocks that have been tilted, folded, or deformed, and then eroded. The angular discordance between the older and younger strata clearly indicates a period of tectonic uplift, deformation, erosion, and subsequent subsidence. This represents a significant gap in the geologic record.
8Which of the following defines the 'strike' of a planar geological feature, such as a fault or bedding plane?
A.The angle of inclination measured from the horizontal plane
B.The compass direction of a line formed by the intersection of a dipping plane with a horizontal plane
C.The direction perpendicular to the dip direction pointing downward
D.The angle between magnetic north and true north
Explanation: The strike is the compass direction of the horizontal line formed by the intersection of a dipping geologic plane (such as a bedding plane, joint, or fault) with a horizontal plane. It is expressed as a bearing (e.g., N30W) or azimuth (e.g., 330 degrees). Strike is always perpendicular to the direction of true dip. Together, strike and dip represent the spatial orientation of planar structures in three dimensions.
9A thrust fault is structurally defined as which of the following?
A.A high-angle normal fault with dip greater than 45 degrees
B.A low-angle reverse fault with a dip of 45 degrees or less
C.A strike-slip fault with horizontal displacement
D.A fault where the hanging wall moves downward relative to the footwall
Explanation: A thrust fault is a low-angle reverse fault, typically dipping at 45 degrees or less (often less than 30 degrees), where the hanging wall moves upward relative to the footwall. Thrust faults are products of intense compressional stress, commonly found in accretionary prisms and collisional mountain belts (orogens). They can transport large sheets of rock over tens of kilometers, causing stratigraphic repetition where older rocks lie on top of younger ones.
10If a fold has its youngest strata exposed in the center (core) of the structure and its limbs dip inward toward the hinge line, the fold is classified as a/an:
A.Anticline
B.Syncline
C.Monocline
D.Dome
Explanation: A syncline is a fold in which the strata dip inward toward the fold axis (hinge line), forming a trough-like structure. Stratigraphically, the youngest rock layers are exposed along the core (center) of the fold, with progressively older layers exposed outward on the limbs. This is the direct opposite of an anticline, where limbs dip away from the hinge line and the oldest rocks are in the core.

About the PRC Geologist Exam

The PRC Geologist Licensure Examination is the professional qualifying exam for geologists in the Philippines. Administered annually, it certifies that candidates possess the necessary academic and practical knowledge to practice geology legally under Republic Act No. 10166 (Geology Profession Act of 2012). The exam tests core competencies across General Geology, Mineralogy and Petrology, and Applied Geology (including hydrogeology, engineering geology, mineral deposits, geophysics, and professional ethics).

Assessment

100 multiple-choice questions across three consecutive days (General Geology: 40%, Mineralogy and Petrology: 30%, Applied Geology: 30%)

Time Limit

3 Days

Passing Score

70% GWA

Exam Fee

PHP 900 (Professional Regulation Commission (PRC) & Professional Regulatory Board of Geology)

PRC Geologist Exam Content Outline

40%

General Geology

Principles of geology, structural geology, plate tectonics, stratigraphy, geomorphology, and Philippine geology.

30%

Mineralogy and Petrology

Crystallography, mineral chemistry, identification of rock-forming minerals, and genesis/classification of igneous, sedimentary, and metamorphic rocks.

30%

Applied Geology

Economic geology, geophysics, hydrogeology, engineering geology, environmental geology, and Republic Act 10166.

How to Pass the PRC Geologist Exam

What You Need to Know

  • Passing score: 70% GWA
  • Assessment: 100 multiple-choice questions across three consecutive days (General Geology: 40%, Mineralogy and Petrology: 30%, Applied Geology: 30%)
  • Time limit: 3 Days
  • Exam fee: PHP 900

Keys to Passing

  • Complete 500+ practice questions
  • Score 80%+ consistently before scheduling
  • Focus on highest-weighted sections
  • Use our AI tutor for tough concepts

PRC Geologist Study Tips from Top Performers

1Familiarize yourself with the major tectonic structures of the Philippines, such as the Philippine Fault Zone, the Manila Trench, and the Philippine Trench.
2Understand the geological distinction between the Palawan Microcontinental Block (Eurasian affinity) and the Philippine Mobile Belt (island arc affinity).
3Memorize the crystal systems and their characteristic symmetry axes, as well as Bragg's Law for crystallography calculations.
4Practice reading stereographic projections and converting between true dip and apparent dip for structural mapping questions.
5Learn the mineral assemblages of metamorphic facies, particularly Greenschist, Amphibolite, Blueschist, and Eclogite.
6Master Darcy's Law calculations and the Ghyben-Herzberg relation for coastal groundwater dynamics.
7Study Rock Quality Designation (RQD) equations and Rock Mass Rating (RMR) classifications for engineering geology.
8Thoroughly read Republic Act No. 10166, particularly the definition of geology practice, qualifications of board members, and penal provisions.

Frequently Asked Questions

What is the coverage of the PRC Geologist Licensure Examination?

The board exam is divided into three days, each representing a core subject: Day 1 covers General Geology (40% weight, including structural geology, geomorphology, stratigraphy, and Philippine geology); Day 2 covers Mineralogy and Petrology (30% weight, focusing on crystallography, rock-forming minerals, and petrography); and Day 3 covers Applied Geology (30% weight, including economic ore deposits, geophysics, hydrogeology, engineering geology, and R.A. 10166).

What are the passing scores for the exam?

A candidate must achieve a General Weighted Average (GWA) of at least 70% across all three subjects, with no grade lower than 50% in any individual subject.

Are there exemptions from taking the geology board exam?

Yes. Under Section 26 of Republic Act No. 10166 (Geology Profession Act of 2012), a graduate with a Doctor of Philosophy (Ph.D.) in Geology or an equivalent degree in a specialized branch of geology from a recognized institution may be exempted from taking the board exam, subject to evaluation and approval by the Board of Geology.

What law governs the geology profession in the Philippines?

The profession is governed by Republic Act No. 10166, also known as the 'Geology Profession Act of 2012.' This law repealed the older Republic Act No. 4209 (the original Geologist Act) to update professional standards and safety guidelines.

How often is the Geologist Licensure Examination held?

The examination is held once a year, typically in the month of November, at testing centers designated by the Professional Regulation Commission (PRC).