Personal Identification Techniques Review Questions 1
Personal Identification Techniques Review Questions 1
1. In the classification of a loop pattern, the examiner draws an imaginary line between the core and the delta and counts every ridge crossing this line. If the line touches a ridge precisely at its point of bifurcation, how many ridges should be counted?
A. One ridge
B. Two ridges
C. No ridge
D. Three ridges
Correct Answer: B. Two ridges
Explanation: Under standard fingerprint rules for ridge counting, if the imaginary line crosses or touches a bifurcation, both branches of the fork are counted, resulting in a count of two.
In fingerprint classification, when the imaginary line touches a bifurcation, both branches are counted. That’s why the ridge count is two, not one.
2. An examiner is analyzing a Plain Whorl pattern. While tracing the ridge originating from the left delta toward the right delta, the ridge suddenly terminates. What is the correct procedure for the examiner to follow?
A. Stop the tracing and classify it as a Meeting Whorl
B. Drop to the next ridge immediately below it and continue tracing
C. Move to the ridge immediately above it and continue tracing
D. Abort the tracing and perform ridge counting instead
Correct Answer: B. Drop to the next ridge immediately below it and continue tracing.
Explanation: In ridge tracing, when a ridge being traced ends or terminates, the examiner must drop down to the next continuous ridge directly below it and continue tracing toward the right delta.
3. When taking fingerprint samples from a suspect, the booking officer spreads a small amount of fingerprint ink across a glass slab. What is the main objective of using a roller to perform "slab rolling"?
A. To dry the ink quickly before application
B. To remove dirt and skin debris from the slab
C. To create a thin, uniform, and even film of ink
D. To permanently stain the glass for measurement consistency
Correct Answer: C. To create a thin, uniform, and even film of ink.
Explanation: Slab rolling ensures that the ink is evenly distributed across the surface. If the ink is too thick, it will blot the ridges; if it is too thin, the print will be faint.
4. In completing a fingerprint card, what is the primary purpose of recording the "plain impressions" or "plain impressing" at the bottom of the card?
A. To provide a backup in case the rolled impressions are destroyed by fire
B. To serve as a check to verify that the rolled prints were taken in their proper sequence
C. To measure the exact width of the suspect's palm
D. To capture the ridge details of the second phalanges
Correct Answer: B. To serve as a check to verify that the rolled prints were taken in their proper sequence.
Explanation: Plain impressions are taken simultaneously without rolling. They serve as a control mechanism to ensure that the individual rolled fingers were not accidentally placed in the wrong boxes on the card.
5. During the examination of a whorl pattern, a criminologist performs ridge tracing. The ridge traced from the left delta passes inside or above the right delta, and there are 4 intervening ridges counted between the tracing ridge and the right delta. What is the correct sub-classification of this whorl?
A. Outer Whorl (O)
B. Meeting Whorl (M)
C. Inner Whorl (I)
D. Central Pocket Loop Whorl
Correct Answer: C. Inner Whorl (I)
Explanation: If the ridge being traced passes inside (above) the right delta and there are three (3) or more intervening ridges, it is classified as an Inner Whorl (I). If it passes outside (below) with 3 or more ridges, it would be Outer (O). If there are 0, 1, or 2 intervening ridges, it is Meeting (M).
6. In the study of fingerprint identification, what is the technical term for the science of fingerprinting?
A. Poroscopy
B. Podoscopy
C. Chiroscopy
D. Dactyloscopy
Answer: D. Derived from the Greek words 'dactyl' (finger) and 'skopein' (to examine), this is the standard term for fingerprint identification. Dactyloscopy is the technical term for fingerprint identification.
Poroscopy refers to the study of pores, podoscopy to feet, and chiroscopy to hands.
7. Which fingerprint pattern has two or more deltas and a recurve that forms a whorl pattern?
A. Plain whorl
B. Radial loop
C. Accidental whorl
D. Tented arch
Answer: A. Plain whorl
A plain whorl has one or more ridges that make a complete circuit and usually has at least two deltas.
8. Which fingerprint pattern has a loop that opens toward the thumb?
A. Tented arch
B. Radial loop
C. Plain whorl
D. Accidental whorl
Answer: B. Radial loop
A radial loop opens toward the thumb or the radius bone of the hand.
9. Which type of whorl is formed by a combination of two or more different fingerprint patterns?
A. Plain whorl
B. Radial loop
C. Accidental whorl
D. Tented arch
Answer: C. Accidental whorl
An accidental whorl contains a combination of two or more different patterns, excluding the plain arch and tented arch.
10. Which fingerprint pattern resembles an arch but has an upthrusting ridge?
A. Plain whorl
B. Radial loop
C. Accidental whorl
D. Tented arch
Answer: D. Tented arch
A tented arch resembles a plain arch but has a sharp upthrust, spike, or significant upward ridge formation.
11. Which pattern is classified as a whorl rather than a loop or arch?
A. Plain whorl
B. Radial loop
C. Tented arch
D. Plain arch
Answer: A. Plain whorl
The plain whorl is one of the major whorl patterns and is characterized by a circular or spiral ridge formation.
12. Which fingerprint pattern is characterized by a loop opening toward the radial side of the hand?
A. Accidental whorl
B. Tented arch
C. Radial loop
D. Plain whorl
Answer: C. Radial loop
A radial loop opens toward the radial side, which is the side of the thumb.
13. Which term refers to a condition in which a person has more than the normal number of fingers or toes?
A. Microdactyl
B. Polydactyl
C. Ectodactyl
D. Syndactyl
Answer: B. Polydactyl
Explanation: Polydactyl refers to having extra fingers or toes, resulting in more than the usual number of digits.
14. Which term refers to an abnormally large finger or toe?
A. Macrodactyl
B. Microdactyl
C. Polydactyl
D. Syndactyl
Answer: A. Macrodactyl
Explanation: Macrodactyl means an abnormally large or enlarged finger or toe.
15. Which term refers to an abnormally small finger or toe?
A. Ectodactyl
B. Syndactyl
C. Microdactyl
D. Polydactyl
Answer: C. Microdactyl
Explanation: Microdactyl refers to an abnormally small or underdeveloped finger or toe.
16. Which term refers to a congenital condition involving the absence or splitting of a finger or toe?
A. Ectodactyl
B. Macrodactyl
C. Syndactyl
D. Microdactyl
Answer: A. Ectodactyl
Explanation: Ectodactyl refers to a congenital malformation in which a digit is absent or split, producing a characteristic cleft-like appearance of the hand or foot.
17. Which term refers to two or more fingers or toes that are joined or fused?
A. Polydactyl
B. Syndactyl
C. Microdactyl
D. Macrodactyl
Answer: B. Syndactyl
Explanation: Syndactyl refers to the joining or fusion of two or more fingers or toes, either by skin or by deeper tissues.
18. A person has an extra finger, while another person has unusually large toes. Which terms correctly describe these conditions, respectively?
A. Microdactyl; Ectodactyl
B. Syndactyly; Polydactyl
C. Polydactyl; Macrodactyl
D. Ectodactyl; Microdactyl
Answer: C. Polydactyl; Macrodactyl
Explanation: Polydactyl means having extra digits, while Macrodactyl means having an abnormally large digit.
19. Which minutia is defined as a point where a single friction ridge abruptly terminates?
A. Bifurcation
B. Ridge Ending
C. Short Ridge
D. Dot
Answer: B. Ridge Ending
A ridge ending occurs where a continuous friction ridge line stops and does not extend further.
20. What type of minutia occurs when a single ridge splits into two separate branch ridges?
A. Dot
B. Short Ridge
C. Bifurcation
D. Ridge Ending
Answer: C. Bifurcation
A bifurcation is a fork-like structure where a single ridge divides into two distinct paths.
21. Which minutia appears as a small ridge segment that is significantly shorter than standard ridges but longer than a dot?
A. Short Ridge
B. Bifurcation
C. Ridge Ending
D. Core
Answer: A. Short Ridge
A short ridge travels a brief, visible distance before terminating at both ends.
22. An isolated friction ridge unit that is approximately as long as it is wide is known as a:
A. Short Ridge
B. Dot
C. Ridge Ending
D. Bifurcation
Answer: B. Dot
A dot (also called an island) is the smallest minutia structure, appearing as a tiny, isolated point.
23. When two distinct fingerprint ridges converge to form a single ridge, this structure is classified as a:
A. Dot
B. Ridge Ending
C. Short Ridge
D. Bifurcation
Answer: D. Bifurcation
Bifurcations describe both the splitting of one ridge into two and the converging of two ridges into one.
24. Which minutia feature consists of a brief ridge bounded by two distinct ridge endings placed close together?
A. Dot
B. Short Ridge
C. Bifurcation
D. Continuous Ridge
Answer: B. Short Ridge
A short ridge has a clear start and end point (two ridge endings) spanning a short, finite length.
25. Which fingerprint pattern is the most common, accounting for 60% to 65% of all prints?
A. Arches
B. Loops
C. Whorls
D. Composites
Correct Answer: B. Loops
Loops are the most common fingerprint pattern, making up 60%–65% of all prints, while whorls account for 30%–35% and arches make up only 5%.
26. Which loop pattern opens towards the pinky finger?
A. Radial loop
B. Plain arch
C. Ulnar loop
D. Central pocket loop
Correct Answer: C. Ulnar loop
By definition, an ulnar loop has ridges that flow and open toward the pinky finger (ulnar bone side), whereas a radial loop opens toward the thumb.
27. How many deltas are present in a loop fingerprint pattern?
A. Zero
B. One
C. Two
D. Three
Correct Answer: B. One
Loop patterns always have exactly one delta (a triangular ridge pattern where ridges diverge), unlike arches, which have none, and whorls, which have at least two.
28. Which loop pattern opens towards the thumb?
A. Ulnar loop
B. Radial loop
C. Tented arch
D. Accidental whorl
Correct Answer: B. Radial loop
A radial loop is named after the radius bone and is characterized by ridges opening toward the direction of the thumb.
29. What percentage of fingerprint patterns are classified as whorls?
A. 5%
B. 15%–20%
C. 30%–35%
D. 60%–65%
Correct Answer: C. 30%–35%
Whorls represent approximately 30% to 35% of all fingerprint patterns.
30. What is the minimum number of deltas required for a fingerprint pattern to be classified as a whorl?
A. Zero
B. One
C. Two
D. Four
Correct Answer: C. Two
All whorl patterns (including plain, central pocket, double loop, and accidental) must contain at least two deltas.
31. Which of the following is NOT a recognized type of whorl pattern?
A. Plain whorl
B. Double loop whorl
C. Radial whorl
D. Accidental whorl
Correct Answer: C. Radial whorl
The four main categories of whorls are plain, central pocket loop, double loop, and accidental whorls. "Radial" is a classification reserved for loops.
32. Which fingerprint pattern accounts for only about 5% of all prints?
A. Loops
B. Arches
C. Whorls
D. Radial loops
Correct Answer: B. Arches
Arches are the rarest primary fingerprint pattern, representing only 5% of all human prints.
33. What structural feature is completely absent in an arch pattern?
A. Ridges
B. Deltas and cores
C. Curves
D. Center lines
Correct Answer: B. Deltas and cores
Unlike loops (one delta) and whorls (two or more deltas), arch patterns enter on one side and exit the other with no deltas or core present.
34. What are the two specific sub-types of arch fingerprint patterns?
A. Ulnar and Radial
B. Plain and Tented
C. Central and Accidental
D. Primary and Secondary
Correct Answer: B. Plain and Tented
Arch patterns fall into two distinct classifications: plain arches (smoothly rising, hill-like ridge flow) and tented arches (sharp spike or tent-like ridge flow).
35. Which fingerprint characteristic refers to the general pattern formed by the ridges?
A. Ridge ending
B. Pattern type
C. Core
D. Delta
Answer: B. Pattern type
Explanation: The pattern type describes the overall fingerprint pattern, such as arch, loop, or whorl.
36. Which fingerprint pattern has ridges that enter from one side, recurve, and exit on the same side?
A. Arch
B. Loop
C. Whorl
D. Accidental
Answer: B. Loop
Explanation: A loop has ridges that enter from one side, curve or recurve, and generally exit on the same side.
37. Which fingerprint pattern has ridges that generally pass from one side to the other without making a significant backward turn?
A. Loop
B. Whorl
C. Arch
D. Composite
Answer: C. Arch
Explanation: In an arch, ridges generally flow across the fingerprint from one side to the other. A tented arch has a sharper upthrust.
38. Which fingerprint pattern normally contains at least one ridge that makes a complete circuit around the center?
A. Arch
B. Loop
C. Whorl
D. Tented arch
Answer: C. Whorl
Explanation: A whorl is characterized by one or more ridges forming a circular, spiral, or concentric pattern.
39. What is the name of the triangular ridge formation found in many fingerprint patterns?
A. Core
B. Delta
C. Bifurcation
D. Island
Answer: B. Delta
Explanation: A delta is a triangular or triradial area where ridge flows diverge. It is an important reference point in fingerprint classification.
40. What is the approximate central focal point of a fingerprint pattern called?
A. Delta
B. Core
C. Island
D. Ridge ending
Answer: B. Core
Explanation: The core is the approximate center or focal area of a fingerprint pattern and is used as a reference in fingerprint examination.
41. Which fingerprint characteristic occurs when one ridge divides into two separate ridges?
A. Ridge ending
B. Bifurcation
C. Short ridge
D. Enclosure
Answer: B. Bifurcation
Explanation: A bifurcation is a minutia in which a single ridge splits into two branches.
42. Which minutia occurs when a fingerprint ridge suddenly stops?
A. Ridge ending
B. Bifurcation
C. Delta
D. Core
Answer: A. Ridge ending
Explanation: A ridge ending occurs where a continuous friction ridge terminates or stops.
43. Which fingerprint characteristic is generally considered permanent throughout a person's life, barring major injury or damage to the skin?
A. Fingerprint pattern
B. Finger size
C. Skin color
D. Finger length
Answer: A. Fingerprint pattern
Explanation: The basic friction-ridge patterns are formed before birth and remain essentially unchanged throughout life, although injury or scarring can alter their appearance.
44. Which statement best describes fingerprint individuality?
A. All fingerprints are identical
B. Fingerprints change every year
C. Fingerprints have unique ridge details
D. Only whorls are unique
Answer: C. Fingerprints have unique ridge details
Explanation: Fingerprints are distinguished by their ridge patterns and minutiae, such as ridge endings, bifurcations, and other ridge characteristics. These details are used to compare and identify fingerprints.
45. Which fingerprint pattern has no delta or core and is considered the simplest pattern?
A. Loop
B. Whorl
C. Arch
D. Composite
Answer: C.
Explanation:
Fingerprint patterns are classified into three major groups based on their ridge formations and specific landmark points known as deltas and cores:
Arch: The simplest and rarest major fingerprint pattern (found in roughly 5% of the population). Friction ridges enter from one side of the print, rise in the center (forming a wave or tent-like shape), and exit on the opposite side. Plain arches contain zero deltas and zero cores.
Loop: Contains one delta and one core. Ridges enter from one side, curve around, and exit on the same side.
Whorl: Contains at least two deltas and a core formed by circular or spiral ridge patterns.
Composite: A sub-category or combination of patterns (such as double loops or accidental whorls) that contains two or more deltas.
46. Alphonse Bertillon is chiefly credited with developing which of the following?
A. The first fingerprint classification system
B. The anthropometric identification system
C. DNA typing
D. Blood spatter pattern analysis
Answer: B.
Explanation:
Alphonse Bertillon (1853–1914), a French police officer and biometrics researcher, developed Bertillonage (anthropometry) in the late 19th century. This was the first scientific system used by law enforcement to identify criminals.
The system relied on precise physical measurements of specific body parts (such as head length, ear length, left foot length, and middle finger length), combined with standardized mugshots and record cards. While highly influential, Bertillonage was largely replaced in the early 20th century by fingerprinting, which proved to be more accurate, unique, and easier to implement.
Why the other options are incorrect:
A. The first fingerprint classification system: Sir Francis Galton, Sir Edward Henry, and Juan Vucetich are credited with developing the early fingerprint classification systems.
C. DNA typing: Sir Alec Jeffreys developed DNA profiling/typing in 1984.
D. Blood spatter pattern analysis: Early pioneering work in bloodstain pattern analysis is credited to Eduard Piotrowski and later formalized by Dr. Paul Kirk and Herbert MacDonell.
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