Identification — MCQs

Identification Indian Medical PG Practice Questions and MCQs

Question 61: According to the universal system, which tooth is denoted by the number 23?

A. Upper left temporary canine
B. Lower left permanent lateral incisor (Correct Answer)
C. Lower right first premolar
D. Upper left permanent canine

Explanation: ### Explanation The **Universal Numbering System** (also known as the American System) is a high-yield topic in forensic odontology. Unlike the FDI system (which uses two digits) or the Zsigmondy-Palmer system (which uses quadrants), the Universal System assigns a unique number or letter to each tooth. **1. Why Option B is Correct:** In the Universal System for **permanent teeth**, numbering starts from the upper right third molar (Tooth 1) and proceeds clockwise: * **1–16:** Upper right 3rd molar to upper left 3rd molar. * **17–32:** Lower left 3rd molar to lower right 3rd molar. Following this sequence, the lower left teeth are numbered 17 through 24. * 17: Lower left 3rd molar * 22: Lower left central incisor * **23: Lower left lateral incisor** * 24: Lower left canine **2. Analysis of Incorrect Options:** * **Option A (Upper left temporary canine):** In the Universal System, deciduous (temporary) teeth are denoted by **letters (A–T)**, not numbers. The upper left temporary canine is "H". * **Option C (Lower right first premolar):** This would be **Tooth 28**. (Lower right teeth range from 25 to 32). * **Option D (Upper left permanent canine):** This would be **Tooth 11**. (Upper left teeth range from 9 to 16). **3. Clinical Pearls for NEET-PG:** * **FDI System (Most Common):** Uses two digits (Quadrant-Tooth). Tooth 23 in FDI refers to the Upper Left Canine (Quadrant 2, Tooth 3). **Do not confuse this with the Universal System.** * **Deciduous Teeth (Universal):** Uses letters A through T. * **Gustafson’s Method:** The most reliable method for age estimation from a single tooth in adults (uses 6 parameters: Sclerosis, Atrophy, Cementum, Dentin, Resorption, Transparency). * **Rule of Thumb:** If the question mentions a number above 20 for a permanent tooth and doesn't specify a quadrant, it is likely the Universal System.

Question 62: Edgeoscopy refers to what type of evaluation?

A. Evaluation of fingerprint ridges (Correct Answer)
B. Evaluation of lip print edges
C. Evaluation of footprint edges
D. Evaluation of palatal rugae

Explanation: **Explanation:** **Edgeoscopy** is a specialized method of fingerprint identification that involves the study of the **characteristic shapes and margins of the papillary ridges**. It was first introduced by **Salil Chatterjee** in 1962. While standard dactyloscopy focuses on ridge patterns (loops, whorls) and minutiae (Galton details), edgeoscopy examines the microscopic variations along the edges of the ridges, such as straight, convex, concave, or jagged borders. These features are permanent, unique, and provide an additional layer of identification, especially when only partial or blurred prints are available. **Analysis of Incorrect Options:** * **Option B (Lip prints):** The study of lip prints is called **Cheiloscopy**. It uses the classification of patterns (e.g., Suzuki and Tsuchihashi) found on the vermilion border of the lips. * **Option C (Footprints):** The study of footprints for identification is known as **Podoscopy**. It is particularly useful in neonates (footprinting) and at crime scenes where footwear or bare footprints are left behind. * **Option D (Palatal rugae):** The study of the unique patterns of the palatal rugae (the ridges on the roof of the mouth) is called **Palatoscopy** or **Rugoscopy**. **NEET-PG High-Yield Pearls:** * **Poroscopy:** The study of the size, shape, and distribution of sweat pores on the ridges (introduced by Edmond Locard). * **Dactyloscopy:** The standard scientific study of fingerprints for identification. * **Bertillonage (Anthropometry):** An obsolete system based on physical body measurements. * **Quetelet’s Rule:** States that no two human beings are exactly alike, which forms the basis of biological identification.

Question 63: Locard's principle is famously associated with which concept?

A. The theory of exchange (Correct Answer)
B. Fingerprint study
C. Formula for estimation of stature
D. System of personal identification using body measurements

Explanation: **Explanation:** **Locard’s Principle of Exchange** is the fundamental cornerstone of forensic science. Formulated by Edmond Locard (often called the "Sherlock Holmes of France"), the principle states: **"Every contact leaves a trace."** 1. **Why Option A is Correct:** The theory of exchange posits that whenever two objects or individuals come into contact, there is a cross-transfer of physical evidence (e.g., dust, hair, fibers, blood, or DNA). In forensic medicine, this allows investigators to link a suspect to a victim or a crime scene based on the material exchanged during the interaction. 2. **Why Other Options are Incorrect:** * **Option B (Fingerprint study):** Known as **Dactylography** or the Galton-Henry system. While Locard worked with fingerprints (Poroscopy), his primary principle is broader than just fingerprints. * **Option C (Formula for estimation of stature):** This refers to mathematical formulas like **Pearson’s formula** or **Trotter and Gleser’s formula**, used in forensic anthropology to calculate height from long bones. * **Option D (System of body measurements):** This refers to **Bertillonage** (Anthropometry), developed by Alphonse Bertillon, which was the standard for identification before dactylography. **High-Yield NEET-PG Pearls:** * **Edmond Locard** also pioneered **Poroscopy** (the study of sweat pores on fingerprint ridges), which is useful when only partial prints are available. * **Quetelet’s Rule:** States that no two individuals are exactly alike (the biological basis for identification). * **Principle of Individuality:** Every object, natural or man-made, has a unique set of characteristics that distinguishes it from others. * **Locard's Principle** is the scientific justification for collecting "trace evidence" at a crime scene.

Question 64: Estimation of age after 25 years using changes in teeth is done by which method?

A. Galton system
B. Bertillon system
C. Gustafsan's method (Correct Answer)
D. Pearson's formula

Explanation: ### Explanation **Correct Answer: C. Gustafson’s Method** **Gustafson’s method** is the most reliable dental technique for estimating age in adults (typically above 21–25 years). It relies on the cumulative physiological changes that occur in teeth over time. Gustafson identified six age-related parameters, which are scored from 0 to 3: 1. **A**ttrition (wearing down of enamel/dentin) 2. **P**eriodontosis (gum recession) 3. **S**econdary dentin formation (pulp cavity narrowing) 4. **C**ementum apposition (thickening at the root) 5. **R**oot resorption 6. **T**ranslucency of the root (the most reliable single factor) The total score is applied to a regression formula to estimate the age with an error margin of ± 3 to 5 years. **Why other options are incorrect:** * **A. Galton system:** This refers to the classification of **fingerprints** (Dactylography) based on patterns like loops, whorls, and arches. * **B. Bertillon system:** Also known as **Anthropometry**, this method uses 11 specific body measurements for identification. It was used before fingerprinting became the gold standard. * **D. Pearson’s formula:** This is used for the estimation of **stature** (height) from the length of long bones, such as the femur or humerus. **High-Yield Facts for NEET-PG:** * **Boyde’s Method:** Uses incremental lines in enamel (neonatal lines) for age estimation in children. * **Schour and Massler Chart:** A dental eruption chart used for age estimation in infants and children. * **Miles Method:** Estimates age based on the degree of molar wear. * **Amoedo’s Rule:** Relates to identification through bite marks and dental records in forensic odontology.

Question 65: Which of the following X-rays should be advised for age determination between 1-13 years of age?

A. Shoulder
B. Wrist (Correct Answer)
C. Elbow
D. Iliac bones

Explanation: **Explanation:** Age estimation in the pediatric and adolescent age groups is primarily based on the appearance and fusion of ossification centers. **Why Wrist is the Correct Answer:** The **Wrist (specifically the carpal bones)** is the most reliable site for age determination between **1 to 13 years**. This is because the carpal bones follow a predictable chronological sequence of ossification. There are 8 carpal bones, and a common clinical rule of thumb is that the number of carpal bones visible on an X-ray is roughly equal to the **Age in years + 1** (up to age 8). For example, at 2 years of age, 3 carpal bones (Capitate, Hamate, and Triquetral) are typically visible. Beyond the carpal bones, the fusion of the distal radial and ulnar epiphyses helps refine age estimation up to puberty. **Analysis of Incorrect Options:** * **Shoulder:** Useful for age estimation between **14-20 years**, specifically focusing on the fusion of the head of the humerus (18-20 years) and the acromion process. * **Elbow:** Most useful for the age group of **10-16 years**. The sequence of fusion of the four centers (Capitulum, Trochlea, Internal epicondyle, and External epicondyle) is a high-yield area for mid-adolescence. * **Iliac bones:** These are used for older adolescents and young adults (**15-23 years**). The appearance and fusion of the iliac crest (Risser’s sign) and the ischial tuberosity are key markers here. **High-Yield Clinical Pearls for NEET-PG:** * **First carpal bone to ossify:** Capitate (at 1-3 months). * **Last carpal bone to ossify:** Pisiform (at 9-12 years). * **Best site for age < 1 year:** Foot and Ankle (Talus, Calcaneum, and distal Tibia). * **Greulich and Pyle Atlas:** The standard reference used to compare X-rays of the left hand and wrist for skeletal age.

Question 66: The whole skull is used to calculate which of the following indices?

A. Cephalic index (Correct Answer)
B. Nasal index
C. Crural index
D. Brachial index

Explanation: **Explanation:** The **Cephalic Index** is the correct answer because it is a standardized measure used in anthropology and forensic medicine to determine the shape of the head by using the dimensions of the **whole skull**. It is calculated using the formula: * **Cephalic Index = (Maximum Breadth of Skull / Maximum Length of Skull) × 100** Based on this index, skulls are classified into Dolichocephalic (long-headed, e.g., Aryans, Africans), Mesaticephalic (medium), and Brachycephalic (short/broad-headed, e.g., Mongolians). **Analysis of Incorrect Options:** * **Nasal Index:** This is calculated using the **nose** (specifically the nasal aperture in dry skulls). It is the ratio of the maximum width of the nasal aperture to its maximum height. * **Crural Index:** This relates to the **lower limb**. It is the ratio of the length of the tibia to the length of the femur. * **Brachial Index:** This relates to the **upper limb**. It is the ratio of the length of the radius to the length of the humerus. **High-Yield NEET-PG Pearls:** 1. **Cephalic vs. Cranial Index:** The term "Cephalic Index" is used for living subjects (using spreading calipers), while "**Cranial Index**" is the technically precise term for the dry skull. 2. **Dolichocephalic (Index <75):** Common in Pure Indians, Africans, and Australians. 3. **Brachycephalic (Index >80):** Common in Mongolians and Europeans. 4. **Vertical Index:** Another skull-based index that uses the height of the skull instead of the breadth.

Question 67: Which epiphysis appears just before the fusion of the diaphysis?

A. Lower end of femur
B. Upper end of humerus
C. Lower end of fibula
D. Upper end of tibia (Correct Answer)

Explanation: **Explanation:** The correct answer is **Upper end of tibia**. This question tests the understanding of the chronological sequence of ossification and the specific timing of epiphyseal appearance relative to fusion. **The Underlying Concept:** In forensic osteology, most long bones follow a predictable pattern where the epiphysis appears early in childhood and fuses after puberty. However, the **upper end of the tibia** is unique because its secondary center of ossification appears very late (around birth or shortly after) and it is often the last major epiphysis to appear before the general period of adolescent fusion begins. In the context of this specific comparison, the upper tibia's appearance is a critical medicolegal marker for full-term viability, appearing just as other bones are preparing for their growth spurts. **Analysis of Options:** * **Upper end of tibia (Correct):** The epiphysis appears at birth (40 weeks gestation). It is one of the last primary/secondary centers to appear before the long period of childhood growth that precedes fusion. * **Lower end of femur:** This appears at the 9th month of intrauterine life (36-38 weeks). It is a medicolegal sign of a full-term fetus and appears *earlier* than the upper tibia. * **Upper end of humerus:** This appears at birth or shortly after, but it is not the classic answer associated with the "just before fusion" sequence in forensic textbooks. * **Lower end of fibula:** This appears much earlier (around 1-2 years of age), well before the pre-fusion window. **High-Yield Clinical Pearls for NEET-PG:** * **Rule of Appearance at Birth:** Three centers are usually present at birth: Lower end of femur, Upper end of tibia, and Talus/Calcaneum/Cuboid. * **Order of Fusion:** Generally, the epiphysis that appears first, fuses last (except for the fibula). * **Medullary Canal:** The appearance of the upper tibial epiphysis is a definitive sign of a **full-term (40 weeks)** fetus. * **Atavistic Epiphysis:** Coracoid process of the scapula is a classic example.

Question 68: The Carabelli Cusp on a maxillary molar is characteristic of which racial group?

A. Mongoloids
B. Caucasoids (Correct Answer)
C. Negroids
D. None of the above

Explanation: **Explanation:** The **Carabelli Cusp** (or tubercle of Carabelli) is an accessory cusp found on the mesiolingual surface of the **permanent maxillary first molars**. In forensic odontology, dental morphological traits are vital for racial identification (ancestry estimation). * **Caucasoids (Correct):** The Carabelli cusp is a classic phenotypic marker for individuals of European descent (Caucasoids). It is found in approximately **70-80%** of this population, appearing either as a fully developed cusp or a small pit/groove. * **Mongoloids (Incorrect):** This group is characterized by **Shovel-shaped incisors** (a high-yield NEET-PG fact). They rarely exhibit the Carabelli cusp; instead, they often show "Protostylid" cusps on mandibular molars. * **Negroids (Incorrect):** While they may occasionally possess the cusp, the prevalence is significantly lower than in Caucasoids. Negroids are more frequently associated with a higher incidence of **midline diastema** and bimaxillary protrusion. **High-Yield Clinical Pearls for NEET-PG:** 1. **Shovel-shaped incisors:** Most characteristic of **Mongoloids** (e.g., Chinese, Japanese, Eskimos, and American Indians). 2. **Taurodontism:** "Bull-like" teeth with enlarged pulp chambers; seen in Neanderthals and certain genetic syndromes (e.g., Klinefelter syndrome). 3. **Gustafson’s Method:** The most reliable method for age estimation from teeth in adults (uses 6 parameters: Scurvy, Attrition, Periodontitis, Ethmoid dentine, Root resorption, Transparency of root). **Transparency of root** is the most reliable single parameter. 4. **Dental Charting:** The **FDI System** is the most commonly used two-digit system internationally.

Question 69: In which country was fingerprint identification first established?

A. England
B. China
C. India (Correct Answer)
D. Singapore

Explanation: **Explanation:** The systematic use of fingerprints for identification was first established in **India** during the late 19th century. While ancient civilizations (like China) used thumbprints on clay or documents, the scientific and administrative foundation of modern dactylography was laid in Bengal. * **Why India is correct:** In 1858, **Sir William Herschel**, an administrator in Jungipoor, West Bengal, first used handprints on contracts to prevent impersonation. Later, **Sir Edward Henry**, the Inspector General of Police in Bengal, collaborated with two Indian police officers, **Sub-Inspectors Azizul Haque and Hem Chandra Bose**, to develop the "Henry Classification System." This system allowed for the systematic filing and retrieval of fingerprint records. The world’s first Fingerprint Bureau was established in **Calcutta (Kolkata) in 1897**. * **Why other options are incorrect:** * **England:** While the Henry System was later adopted by Scotland Yard (1901), the foundational work and the first bureau were established in India. * **China:** Ancient Chinese used fingerprints as seals on documents, but they did not develop a scientific classification system for forensic identification. * **Singapore:** It adopted these systems much later as part of British colonial administration. **High-Yield NEET-PG Pearls:** * **Father of Fingerprinting:** Sir Francis Galton (who proved permanence and uniqueness). * **Galton’s Details:** The ridge characteristics (minutiae) used for identification. * **First Fingerprint Bureau:** Calcutta, 1897. * **Bertillonage:** An older identification system based on body measurements (Anthropometry), which was replaced by fingerprinting because the latter is more reliable and easier to record. * **Legal Standing:** Fingerprints are considered "absolute" evidence of identity; the chance of two people having the same prints is 1 in 64 billion.

Question 70: The Humero-Femoral index is used for what purpose?

A. Determining stature from long bones
B. Estimating age
C. Determining sex
D. Determining race (Correct Answer)

Explanation: **Explanation:** The **Humero-Femoral Index** is an anthropometric measurement used primarily for **racial identification** in skeletal remains. It expresses the ratio of the maximum length of the humerus to the maximum length of the femur. **1. Why "Determining Race" is correct:** The proportions of the upper limb relative to the lower limb vary significantly across different geographical races. The formula is: * **Index = (Length of Humerus / Length of Femur) × 100** In Caucasoids, the index is typically around **72.5**, whereas in Negroids, it is approximately **70**. These variations in limb proportions are evolutionary adaptations to climate and genetics, making the index a reliable tool for determining ethnic or racial origin. **2. Why other options are incorrect:** * **Stature (A):** While individual lengths of the humerus and femur are used to estimate stature (using **Pearson’s or Trotter & Gleser’s formulae**), the *index* (ratio) itself is not used for height calculation. * **Age (B):** Age estimation from long bones depends on the appearance and fusion of **ossification centers**, not the ratio between two different bones. * **Sex (C):** Sex determination relies on morphological features (e.g., the pelvis or skull) or metric traits like the **Ischio-Pubic Index**. The Humero-Femoral ratio does not show significant sexual dimorphism. **High-Yield Clinical Pearls for NEET-PG:** * **Intermembral Index:** (Humerus + Radius) / (Femur + Tibia) × 100. Also used for racial differentiation. * **Cephalic Index:** Most common index for race (Breadth/Length of skull). * **Crural Index:** (Tibia/Femur) × 100. * **Brachial Index:** (Radius/Humerus) × 100. * Remember: The **Femur** is the most reliable bone for stature estimation, while the **Pelvis** is the most reliable for sex determination.

Practice by Chapter

Personal Identification Methods

Practice Questions

Anthropometry

Practice Questions

Dactylography (Fingerprinting)

Practice Questions

Dental Identification

Practice Questions

DNA Profiling

Practice Questions

Facial Reconstruction

Practice Questions

Superimposition Techniques

Practice Questions

Hair and Fiber Analysis

Practice Questions

Handwriting Analysis

Practice Questions

Identification of Remains

Practice Questions

Mass Disaster Victim Identification

Practice Questions

Age, Sex and Race Determination

Practice Questions

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