Identification Practice Questions

Q: What is the most effective method for personal identification?

Dactylography. **Explanation:** **Dactylography** (Fingerprinting or the Galton System) is considered the most effective and reliable method for personal identification. This is based on two fundamental principles: **Permanence** (the ridge patterns are formed by the 4th month of intrauterine life and remain unchanged until death/decomposition) and **Uniqueness** (no two individuals, including monozygotic twins, have identical fingerprints). The mathematical probability of two people having the same fingerprints is 1 in 64 billion, making it virtually infallible. **Analysis of Incorrect Options:** * **Photography (A):** While useful for general recognition, it is unreliable due to aging, surgical alterations, or changes in facial hair and weight. * **Anthropometry (C):** Also known as the Bertillon system, it relies on body measurements. It was discarded because measurements change with age and different individuals can share similar dimensions (as famously proven in the Will West case). * **X-ray determination (D):** Useful for identifying skeletal remains or age estimation, but it requires antemortem records for comparison and is not as universally unique or easily categorized as fingerprints. **High-Yield Clinical Pearls for NEET-PG:** * **Poroscopy:** The study of sweat gland pores on the ridges (Locard’s method); useful when only a fragment of a fingerprint is available. * **Dactylography in Twins:** Fingerprints are different even in identical (monozygotic) twins, whereas DNA profiles are the same. * **Permanent Impairment:** Fingerprints can only be altered by deep injuries involving the dermis (e.g., leprosy, electric burns, or radiation). * **Primary Patterns:** Loops (65% - most common), Whorls (25%), Arches (7%), and Composite (2-3%).

Q: What percentage of total height does the tibia contribute?

20% of height. ### Explanation **Correct Answer: B. 20% of height** In forensic anthropology and identification, the stature of an individual can be estimated from the measurements of long bones using various formulas (e.g., **Karl Pearson’s formula** or **Trotter and Gleser’s formula**). As a general rule of thumb used in forensic medicine: * **The Tibia** contributes approximately **20% (1/5th)** of the total body height. * **The Femur** contributes approximately **25% (1/4th)** of the total body height. **Analysis of Options:** * **Option A (10%):** This is too low for any major long bone. Small bones like the clavicle or the length of the foot are closer to this proportion, but not the weight-bearing bones of the lower limb. * **Option C (30%):** This overestimates the tibia's contribution. While the entire lower limb (thigh + leg) accounts for nearly 45-50% of height, the tibia alone does not exceed 20-22%. * **Option D (40%):** This is incorrect. Even the femur, the longest bone in the body, only accounts for about 25% of the total stature. **High-Yield Clinical Pearls for NEET-PG:** 1. **Femur** is the most accurate bone for stature estimation, followed by the **Tibia**. 2. **Pan’s Rule:** A quick bedside rule where the length of the humerus is roughly 1/5th to 1/6th of the total height. 3. **Symphysis Pubis to Heel:** In a well-proportioned adult, the distance from the symphysis pubis to the heel is exactly half (50%) of the total height. 4. **Arm Span:** In adults, the total arm span (fingertip to fingertip) is roughly equal to the total height. 5. **Multiplication Factors:** For a quick estimate, the height is roughly **4.5 to 5 times** the length of the femur and **5 times** the length of the tibia.

Q: Which fingerprint pattern shows two or more deltas?

Whorls. **Explanation:** Fingerprint identification (Dactylography) is based on the arrangement of ridges and furrows. The classification depends on the presence of **deltas** (triangular points where three ridge lines meet) and **cores** (the center of the pattern). **1. Why Whorls are correct:** A **Whorl** is characterized by ridges that make at least one complete circuit (circular, spiral, or almond-shaped). By definition, a whorl pattern must have **two or more deltas**. This complexity makes whorls a distinct category in the Galton-Henry system of classification. **2. Why other options are incorrect:** * **Loop (Option A):** This is the most common pattern (60-70%). It contains only **one delta**. Ridges enter from one side, curve back, and exit from the same side. * **Plain Arch (Option B):** This is the simplest pattern. Ridges flow from one side to the other with a slight rise. It has **no delta** and no core. * **Tented Arch (Option C):** A variation of the arch where ridges rise sharply in the center (like a tent pole). While more angular than a plain arch, it still typically possesses **no true delta**. **High-Yield Clinical Pearls for NEET-PG:** * **Frequency:** Loops (60-70%) > Whorls (25-30%) > Arches (5-7%). * **Permanence:** Fingerprints are formed at the **4th month of intrauterine life** and remain unchanged until death (and even after, until the skin decomposes). * **Dactylography (Galton-Henry System):** It is the most reliable method of identification (error rate is 1 in 64 billion). * **Poroscopy (Locard’s Method):** Study of sweat gland pores on the ridges; useful when only partial prints are available. * **Adermatoglyphia:** A rare genetic condition where individuals are born without fingerprints (associated with SMARCAD1 gene mutation).

Q: What is the legal age by which a fetus is considered capable of independent existence?

210 days. **Explanation:** The question pertains to the concept of **Viability**, which is the period of intrauterine life after which the fetus is considered capable of maintaining an independent existence outside the mother's womb. **1. Why 210 days is correct:** In Forensic Medicine and Obstetrics, a fetus is traditionally considered viable at the end of **7 lunar months** (7 × 30 days = **210 days**). At this stage, the fetus typically weighs approximately 1.1 kg and measures about 35 cm. This is the legal threshold often cited in Indian jurisprudence and classical textbooks (like Reddy’s) for the minimum age of independent existence, although modern neonatal care has pushed biological viability earlier. **2. Analysis of Incorrect Options:** * **220, 230, and 240 days:** These represent later stages of gestation (approx. 31–34 weeks). While a fetus at these ages is significantly more mature and has a higher survival rate, they do not represent the *minimum* legal threshold for the onset of viability. **3. High-Yield Facts for NEET-PG:** * **Hase’s Rule:** Used to determine the age of the fetus. For the first 5 months, the age in months is the square root of the length (cm). For the last 5 months, the length (cm) divided by 5 gives the age in months. * **Appearance of Ossification Centers:** * **Calcaneum:** 5th month (210 days). * **Talus:** 7th month (210 days). * **Lower end of Femur:** 9th month (36-40 weeks) – crucial for proving full-term status. * **MTP Act (India):** Note that the Medical Termination of Pregnancy (Amendment) Act, 2021, allows termination up to **24 weeks** (168 days) for specific categories of women, which is a separate legal milestone from the classical 210-day viability rule.

Q: Robert's sign is a feature of which of the following?

Dead born infant. **Explanation:** **Robert’s Sign** is a classic radiological feature used to diagnose **intrauterine fetal death (IUFD)**. It refers to the presence of **gas shadows** (usually nitrogen) within the fetal heart and large blood vessels (aorta and vena cava). This occurs due to the decomposition of blood following fetal demise and can be seen on an X-ray as early as 12 hours after death. **Why the correct answer is right:** * **Option B (Dead born infant):** Robert’s sign is a definitive sign of fetal death in utero. Along with Spalding’s sign (overlapping of skull bones), it confirms that the fetus is no longer alive before delivery. **Why the incorrect options are wrong:** * **Option A & D (Le Fort and Orbital fractures):** These are traumatic injuries of the facial skeleton. While they involve specific radiological signs (e.g., "Dish-face deformity" in Le Fort II), they have no association with fetal gas formation. * **Option C (Live born infant):** A live-born infant will have clear lung expansion (revealed by the hydrostatic test) and no intravascular gas shadows, as decomposition has not occurred. **High-Yield Clinical Pearls for NEET-PG:** * **Spalding’s Sign:** Overlapping of fetal skull bones due to liquefaction of the brain (appears 4–7 days after death). * **Deuel’s Halo Sign:** Edema of the fetal scalp causing a "halo" appearance on X-ray (indicates fetal death). * **Hydrostatic Test (Raygat’s Test):** Used to differentiate between a stillborn and a live-born infant by checking if the lungs float in water (positive in live-born). * **Wredin’s Test:** Presence of air in the middle ear, indicating the infant breathed after birth.

Q: Gustafson's method is useful for the determination of which of the following?

Age. **Explanation:** **Gustafson’s Method** is a forensic technique used for **Age Estimation** in adults by examining morphological changes in a single-rooted tooth. As a person ages, teeth undergo physiological and pathological alterations. Gustafson identified six specific parameters, often remembered by the mnemonic **"PARTS-S"**: 1. **P**eriodontosis (Gum recession) 2. **A**ttrition (Wearing down of occlusal surfaces) 3. **R**oot Resorption 4. **T**ranslucency of Dentin (The most reliable single factor) 5. **S**econdary Dentin deposition (Reduces pulp cavity size) 6. **S**ementum (Cementum) Apposition at the root Each parameter is scored from 0 to 3, and the total score is applied to a regression formula to estimate age with an error margin of approximately ±5–10 years. **Analysis of Incorrect Options:** * **B. Stature:** Estimated using long bones (e.g., Femur, Humerus) via **Pearson’s or Trotter & Gleser formulae**. * **C. Race:** Determined by skull features (Cephalic Index) or dental traits like the **Carabelli cusp** (common in Caucasoids) and shovel-shaped incisors (Mongoloids). * **D. Sex:** Determined by pelvic morphology (most accurate) or skull features. In dentistry, **Amelogenin protein** analysis or Barr bodies in pulp are used for sexing. **High-Yield Clinical Pearls for NEET-PG:** * **Boyde’s Method:** Uses incremental lines in enamel (Cross-striations) for age estimation in children. * **Stack’s Method:** Uses the weight and height of dental tissues for age estimation in fetuses/infants. * **Miles’ Method:** Estimates age based on the degree of molar wear. * **Translucency of Dentin** is considered the most consistent and reliable parameter in Gustafson’s method for aging.

Q: Which method is most specific and sensitive for identification?

Dactylography. **Explanation:** **Dactylography (Fingerprinting)** is considered the most specific and sensitive method for identification because of two fundamental principles: **uniqueness** and **permanence**. No two individuals, including monozygotic twins, have identical fingerprints. These patterns (Galton ridges) develop by the 4th month of intrauterine life and remain unchanged until death (and even after, until the skin decomposes). Its high sensitivity stems from the fact that even a partial print can be sufficient for a positive match. **Analysis of Incorrect Options:** * **Anthropometry (Bertillonage):** This system relies on physical measurements of various body parts. It was discarded because measurements change with age, and two individuals can coincidentally have similar dimensions. It is far less specific than dactylography. * **Skull & Pelvis:** These are skeletal remains used primarily for determining **biological profile** (age, sex, and stature). While the pelvis is the most reliable bone for sex determination, it cannot provide the individualistic identification that a fingerprint offers. **Clinical Pearls for NEET-PG:** * **Galton’s System:** Another name for Dactylography. * **Poroscopy (Locard’s Method):** The study of the number, size, and distribution of sweat pores on the ridges; it is even more specific than dactylography and useful when only a fragment of a print is available. * **Dactylography in Twins:** While DNA is identical in monozygotic twins, their fingerprints are **different**. * **Permanent Impairment:** Fingerprints can only be altered by deep injuries reaching the dermis, or by conditions like leprosy and certain skin diseases.

Question 1

All are tests done on blood except?

Accepted Answer

Acid phosphatase test

Answer

Benzidine test

Answer

Hemochromogen test

Answer

Teichmann's test

Question 2

What is the most effective method for personal identification?

Accepted Answer

Dactylography

Answer

Photography

Answer

Anthropometry

Answer

X-ray determination

Question 3

What percentage of total height does the tibia contribute?

Accepted Answer

20% of height

Answer

10% of height

Answer

30% of height

Answer

40% of height

Question 4

Which fingerprint pattern shows two or more deltas?

Accepted Answer

Whorls

Answer

Loop

Answer

Plain arch

Answer

Tented arch

Question 5

What is the legal age by which a fetus is considered capable of independent existence?

Accepted Answer

210 days

Answer

240 days

Answer

230 days

Answer

220 days

Question 6

Robert's sign is a feature of which of the following?

Accepted Answer

Dead born infant

Answer

Le fort fracture grade II

Answer

Live born infant

Answer

Orbital fracture

Question 7

Gustafson's method is useful for the determination of which of the following?

Accepted Answer

Age

Answer

Stature

Answer

Race

Answer

Sex

Question 8

An unidentified dead body is brought for autopsy. A faded tattoo mark is noticed on the left arm. Which of the following methods can be used to enhance the tattoo mark for identification?

Accepted Answer

Infrared photography

Answer

Application of isopropyl alcohol

Answer

Bright illumination

Answer

All of the above

Question 9

All are true about permanent teeth, except?

Accepted Answer

A ridge is present between the neck and body.

Answer

Anterior teeth are inclined forward.

Answer

Roots of molars are larger.

Answer

They are ivory white in color.

Question 10

Which method is most specific and sensitive for identification?

Accepted Answer

Dactylography

Answer

Anthropometry

Answer

Skull

Answer

Pelvis

Identification — MCQs

Identification — MCQs

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