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100+ Free Polícia Federal — Perito Criminal Federal Practice Questions
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2026 Statistics
Key Facts: Polícia Federal — Perito Criminal Federal Exam
120 items
Objective questions in the official Cebraspe test
Edital Concurso Polícia Federal
270 mins
Time limit (4h30) for both objective and discursive tests
Edital Concurso Polícia Federal
48.00 pts
Minimum net score required on the objective test
Polícia Federal Scoring Matrix
10 stages
Statutory chain of custody steps (Art. 158-B CPP)
Brazilian Code of Criminal Procedure / Law 13.964/2019
1 Official Expert
Minimum official expert (Perito Oficial) required for laudo (Art. 159 CPP)
Law 11.690/2008 / Art. 159 CPP
The Polícia Federal Perito Criminal Federal examination is Brazil's premier federal scientific police test. Candidates must master General Criminalistics (Locard principle, trace classification, scene preservation), the 10 statutory Chain of Custody stages under CPP Arts. 158-A to 158-F, Federal Criminal Law (Environmental, Drugs, Arms Acts), Digital Forensics (RFC 3227, write blockers, hashing), and Technical Forensic Report writing. A net score of 48.00+ points is required to advance.
Sample Polícia Federal — Perito Criminal Federal Practice Questions
Try these sample questions to test your Polícia Federal — Perito Criminal Federal exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.
1What core principle of criminalistics, formulated by Edmond Locard, asserts that whenever two entities come into physical contact, a mutual transfer of material inevitably occurs?
A.Principle of Exchange (Princípio da Troca)
B.Principle of Individual identification (Princípio da Identidade)
C.Principle of Universal Description (Princípio da Descrição)
D.Principle of Relative Probability (Princípio da Probabilidade)
Explanation: Edmond Locard's exchange principle (Princípio da Troca de Locard) is a foundational axiom of forensic science, stating that 'every contact leaves a trace' (tout contact laisse une trace). When a perpetrator enters a crime scene, they both leave physical traces (such as fibers, biological fluids, or latent fingerprints) and carry away traces from the environment or victim. This mutual physical transfer provides the scientific basis for linking suspects, victims, and crime scenes.
2In criminalistics methodology, how is an 'immediate crime scene' (local de crime imediato) strictly distinguished from a 'mediate crime scene' (local mediato)?
A.The immediate scene encompasses the exact geographical epicenter where the criminal act occurred or where the corpus delicti/victim is located, whereas the mediate scene comprises the surrounding adjoining environment.
B.The immediate scene refers exclusively to enclosed indoor rooms, whereas the mediate scene refers exclusively to open outdoor areas.
C.The immediate scene is examined exclusively by federal forensic experts, whereas the mediate scene is processed by local municipal police.
D.The immediate scene refers to physical traces collected within the first hour, whereas the mediate scene refers to traces collected after 24 hours.
Explanation: In forensic topography, the crime scene is classified into immediate (local imediato), mediate (local mediato), and related scenes (locais relacionados). The immediate scene is the focal area where the main criminal event took place and where major physical evidence (such as a body, breached safe, or weapon) is concentrated. The mediate scene encompasses the contiguous surrounding environment (such as access corridors, yards, and escape routes) that may hold supporting physical traces.
3A crime scene where physical elements have been moved, contaminated, or removed before the arrival of the official criminal expert is classified in Brazilian criminalistics as:
A.An unpreserved or altered crime scene (local inidôneo ou violado)
B.A pristine or preserved crime scene (local idôneo)
C.A simulated crime scene (local forjado)
D.A related crime scene (local relacionado)
Explanation: A crime scene is classified as 'inidôneo' (unpreserved, violated, or altered) when its original physical state has been modified prior to forensic processing, whether through weather exposure, bystander trampling, or improper handling by first responders. In contrast, a 'local idôneo' has been properly preserved and isolated, maintaining its original evidentiary integrity.
4In forensic traceology (vestigiológia), what is the technical definition of an 'illusory trace' (vestígio ilusório)?
A.A physical trace found at the crime scene that was produced without any connection to the criminal event under investigation.
B.A physical trace intentionally planted or modified by the perpetrator to misdirect the forensic investigation.
C.A physical trace that directly proves the material commission of the crime and links the perpetrator to the victim.
D.A digital trace that has been permanently deleted from volatile RAM memory.
Explanation: In criminalistics theory, physical traces (vestígios) are divided into true (verdadeiros), illusory (ilusórios), and forged (forjados). An illusory trace (vestígio ilusório) is an authentic physical object or mark present at the scene that has no causal or temporal relationship with the criminal infraction (for example, a clean drinking glass left by a homeowner hours before a burglary).
5Which search pattern is methodologically best suited for forensic experts searching for physical evidence across a large, open outdoor crime scene, such as a rural field or dense forest?
A.Parallel line (or strip) search method (método de busca em faixas ou linhas paralelas)
B.Wheel or radial search method (método radial)
C.Zone or quadrant search method (método de zonas)
D.Spiral inward search method (método espiral)
Explanation: The strip/parallel line search method (busca em faixas ou linhas paralelas) is the standard criminalistics search technique for expansive, open outdoor terrains. Searchers align abreast at calibrated intervals and advance synchronously along straight parallel paths, ensuring systematic visual coverage of uneven terrain and minimizing unexamined blind spots.
6When documenting a crime scene through photography, what is the mandatory requirement for close-up photographs (fotografias de detalhe) of physical traces according to forensic standards?
A.They must be captured perpendicular (at 90 degrees) to the trace, both with and without an adjacent calibrated metric scale and forensic identifier.
B.They must only be taken using oblique angled lighting without any metric scale present to avoid obscuring fine textures.
C.They must be taken exclusively using wide-angle fish-eye lenses to incorporate the background context.
D.They must be edited with digital sharpening filters prior to being attached to the official expert report.
Explanation: Forensic close-up documentation requires two sequential, uncompressed photographs taken perpendicular (90°) to the subject plane to eliminate perspective distortion: first, an untouched photograph of the trace in situ, and second, a photograph with a rigid, calibrated metric scale (escala métrica) and unique evidence placard placed alongside on the same focal plane.
7What is the primary technical function of a forensic crime scene sketch (croqui forense) alongside photographic documentation?
A.To provide an accurate, scaled schematic showing exact spatial relationships, reference points, and measurements of physical evidence free from optical distortions.
B.To replace the written expert report description and eliminate the need for photographic evidence.
C.To record subjective artistic impressions of witness demeanor and suspect psychology.
D.To serve exclusively as an informal scratchpad that is discarded prior to submitting the formal laudo pericial.
Explanation: A forensic sketch (croqui forense) is a precise metric graphic representation of the crime scene. It complements photographs by stripping away visual clutter and presenting exact, scaled spatial geometry, fixed reference triangulation or rectangular coordinates, and relative distances between corpus delicti and surrounding physical boundaries without perspective distortion.
8In forensic ballistics, how is the 'internal ballistics' (balística interna) domain defined?
A.The study of phenomena that occur inside the firearm from the moment the firing pin strikes the primer until the projectile exits the muzzle.
B.The study of the projectile's trajectory through the air from the firearm's muzzle to the target.
C.The study of the projectile's physical interaction, penetration, and wounding mechanisms inside the target body.
D.The study of chemical propellant synthesis and metallurgical manufacturing of firearm barrels.
Explanation: Internal ballistics (balística interna) analyzes all physical and chemical processes occurring within the weapon, including trigger release, firing pin impact, deflagration of propellant gunpowder, chamber pressure dynamics, obturation, and the engraving of lands and grooves on the projectile as it travels along the rifled barrel until muzzle exit.
9In the examination of gunshot entry wounds in human tissue, what physical characteristic exclusively indicates a contact gunshot wound (tiro encostado) with bone support underneath, producing the classical 'Krönelein / Puppe / Werkgartner' or 'boca de mina de Hofmann' phenomenon?
A.A stellate, jagged laceration of the skin with subcutaneous pocketing of soot and expanded propellant gases against bone (Câmara de Mina de Hofmann).
B.A concentric ring of tattoo stippling (tatuagem) spread across a 50 cm radius around a circular entry hole.
C.A clean circular hole surrounded only by a contusion-wiping collar (orla de enxugo e contusão) with zero soot or thermal burns.
D.Multiple irregular entry perforations caused by projectile fragmentation in mid-air.
Explanation: A contact gunshot wound against hard bone (such as the cranium) creates the Hofmann mine chamber (Câmara de Mina de Hofmann). The expanding propellant gases enter the subgaleal space, rebound against the unyielding bone table, and forcefully rupture the skin from the inside out, creating a characteristic stellate, lacerated entry wound with internal soot and gunpowder deposition.
10In Bloodstain Pattern Analysis (BPA), what mathematical relationship is used to determine the angle of impact (θ) of an elongated blood drop on a non-porous flat surface?
A.θ = arcsin(width / length)
B.θ = arccos(width / length)
C.θ = arctan(length / width)
D.θ = width / (length * 100)
Explanation: The angle of impact (θ) of a blood drop striking a planar surface is calculated using the trigonometric relationship: θ = arcsin(W / L), where W is the minor axis (width) and L is the major axis (length) of the elliptical blood stain, excluding any trailing satellite spines or tails.
About the Polícia Federal — Perito Criminal Federal Practice Questions
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