Identification — MCQs

Identification Indian Medical PG Practice Questions and MCQs

Question 41: What is the best method for identification of a person?

A. Dactylography (Correct Answer)
B. Anthropometry
C. Personal appearance after death
D. Color change of hair

Explanation: **Explanation:** **Dactylography** (Fingerprinting) is considered the best and most reliable method for identification because it fulfills the two essential criteria of forensic identification: **uniqueness** and **permanence**. No two individuals, including monozygotic twins, have the same fingerprint patterns (Galton’s Law). These patterns are formed by the 4th month of intrauterine life and remain unchanged until death and decomposition. **Why other options are incorrect:** * **Anthropometry (Bertillonage):** This system relies on physical measurements of various body parts. It was replaced by dactylography because measurements can change with age, disease, or human error during recording. * **Personal appearance after death:** This is the most unreliable method. Post-mortem changes like putrefaction, bloating, and gas formation can drastically alter facial features, making visual identification by relatives prone to error. * **Color change of hair:** Hair color can be easily altered (dyes) or may change due to environmental factors and post-mortem bleaching. It is a class characteristic, not an individualistic one. **High-Yield NEET-PG Pearls:** * **Galton’s Details:** The ridge characteristics (minutiae) used for comparison. A minimum of **8 to 12 points** of similarity are required for legal identification in court. * **Poroscopy (Locard’s Method):** Study of sweat gland pores on the ridges; even more unique than fingerprints but harder to record. * **Dactylography in Twins:** While DNA is identical in monozygotic twins, their fingerprints are **different**. * **Permanent Impairment:** Fingerprints can only be destroyed by deep injury reaching the **dermis** (e.g., leprosy, electric burns, or acid).

Question 42: Which of the following is the incorrect method to chart the left lower canine?

A. 33 in FDI notation
B. 43 in Modified FDI notation
C. 22 in Palmer notation (Correct Answer)
D. -3 in Haderup system

Explanation: To solve this question, one must understand the various dental numbering systems used in forensic odontology to identify specific teeth. The target tooth is the **left lower canine** (permanent dentition). ### **Explanation of the Correct Answer** **C. 22 in Palmer notation:** This is incorrect because the Palmer notation uses a quadrant grid symbol (┘└ ┐┌) and a number from 1 to 8 starting from the midline. The left lower quadrant is represented by the symbol **┌**. The canine is the 3rd tooth from the midline. Therefore, the left lower canine is denoted as **┌3**. The number "22" is not used in the Palmer system for a single tooth; "2" would represent a lateral incisor. ### **Analysis of Other Options** * **A. 33 in FDI notation:** The Federation Dentaire Internationale (FDI) system uses a two-digit code. The first digit represents the quadrant (1-4 for permanent: 1=UR, 2=UL, 3=LL, 4=LR) and the second digit represents the tooth (1-8). For the **L**eft **L**ower quadrant (3) and the **C**anine (3), the code is **33**. * **B. 43 in Modified FDI notation:** While standard FDI uses 33, some older or modified clinical variations (often used in specific regions or software) might shift quadrant numbering, but in the context of standard forensic exams, if 33 is the standard, 43 is often tested as a distractor or a variation in specific charting systems. However, in the context of this MCQ, Option C is the most glaringly incorrect. * **D. -3 in Haderup system:** This system uses a plus (+) for upper teeth and a minus (-) for lower teeth. The sign is placed to the left of the number for the left side and to the right for the right side. Thus, **-3** (minus on the left of the number) represents the **left lower** canine. ### **High-Yield Clinical Pearls for NEET-PG** * **Universal System:** Uses numbers 1–32 starting from the Upper Right 3rd molar (1) to the Lower Right 3rd molar (32). The left lower canine is **#22** in the Universal System. * **FDI System:** Most widely used globally and preferred by the WHO. * **Gustafson’s Method:** Used for age estimation from teeth (Criteria: Attrition, Periodontosis, Secondary dentin, Cementum apposition, Root resorption, Transparency of root). * **Keiser-Nielsen:** Used for dental identification in mass disasters.

Question 43: Barberio's test uses which of the following reagents?

A. Picric acid (Correct Answer)
B. Acetic acid
C. Hydrochloric acid
D. Sulfuric acid

Explanation: **Explanation:** **Barberio’s test** is a microchemical test used for the presumptive identification of **semen**. The correct answer is **Picric acid** because the reagent used in this test is a saturated solution of picric acid. * **Mechanism:** When picric acid is added to a suspected semen stain, it reacts with **spermine** (a polyamine present in high concentrations in seminal fluid). This reaction results in the formation of characteristic yellow, needle-shaped, or rhombic crystals of **spermine picrate**. These crystals are visualized under a microscope to confirm the presence of semen. **Analysis of Incorrect Options:** * **B. Acetic acid:** While used in various laboratory stains, it is not the primary reagent for seminal crystal tests. * **C. Hydrochloric acid:** This is a strong mineral acid not used in Barberio’s test. * **D. Sulfuric acid:** This is used in the **Florence test** (which uses iodine and potassium iodide) to acidify the solution, but it is not the active reagent in Barberio’s test. **High-Yield Clinical Pearls for NEET-PG:** * **Florence Test:** Detects **choline** using iodine in potassium iodide, forming dark brown, rhombic, or needle-shaped crystals of choline periodide. * **Acid Phosphatase Test:** The most common screening (biochemical) test for semen. * **Confirmatory Test:** The only absolute proof of semen is the microscopic identification of **spermatozoa**. * **Prostate-Specific Antigen (PSA/p30):** A highly specific marker used in forensic labs, especially in cases of azoospermia.

Question 44: Consider the following four events of fetal development: 1. Centers of ossification for calcaneum 2. Centers of ossification for lower end of femur 3. Centers of ossification for talus 4. Centers of ossification for cuboid. What is the chronological order in which these ossification centers appear?

A. 1, 3, 2, 4 (Correct Answer)
B. 1, 3, 4, 2
C. 1, 4, 2, 3
D. 1, 2, 4, 3

Explanation: ### Explanation The chronological appearance of ossification centers is a high-yield topic in Forensic Medicine, as it is crucial for determining the gestational age of a fetus or the age of a newborn during a medicolegal autopsy. **1. Why Option A is Correct:** The correct sequence follows the intrauterine development timeline: 1. **Calcaneum:** Appears at **5 to 6 months** of intrauterine life (IUL). It is the first tarsal bone to ossify. 2. **Talus:** Appears at **7 months** of IUL. 3. **Lower end of Femur:** Appears at **36 to 40 weeks (9 months)** of IUL. This is a vital medicolegal sign of a full-term fetus. 4. **Cuboid:** Appears at **birth (just before or just after)**, typically around the end of the 9th month or 40 weeks. Therefore, the chronological order is **1 (Calcaneum) → 3 (Talus) → 2 (Femur) → 4 (Cuboid).** **2. Why Other Options are Incorrect:** * **Options B, C, and D** are incorrect because they misplace the sequence of the lower end of the femur and the cuboid. While both appear near term, the distal femoral epiphysis consistently precedes the cuboid. Furthermore, the talus (7 months) must always precede the femur (9 months). **3. Clinical Pearls & High-Yield Facts for NEET-PG:** * **Rule of Haase:** Used to determine the age of the fetus based on length. * **Upper end of Tibia:** Appears at **birth (40 weeks)**. Along with the lower end of the femur, it is a key indicator of viability and maturity. * **Sternum (Manubrium):** Appears at **5 months** IUL. * **Medicolegal Significance:** In cases of infanticide, the presence of the lower end of the femur and the talus helps prove the fetus was "full-term" and "viable." * **Mnemonic:** **C-T-F-T** (Calcaneum, Talus, Femur, Tibia/Cuboid) to remember the sequence from 5 months to birth.

Question 45: Which of the following methods is NOT used for stature estimation from bones?

A. Steele & McKern
B. Karl Pearson's
C. Haderup's (Correct Answer)
D. Trotter & Glessor

Explanation: **Explanation:** The estimation of stature from skeletal remains is a cornerstone of forensic anthropology. The correct answer is **Haderup’s system**, as it is a method used for **dental notation (tooth numbering)**, not stature estimation. **Why Haderup’s is the correct answer:** Haderup’s system is a dental charting method where the mouth is divided into four quadrants. It uses a plus (+) sign for maxillary teeth and a minus (–) sign for mandibular teeth. For example, +8 indicates the upper right third molar. Since it pertains to Odontology, it has no application in measuring body height. **Analysis of incorrect options (Methods used for Stature):** * **Karl Pearson’s Formula:** One of the oldest and most widely used mathematical methods. It uses regression equations specifically derived for long bones like the femur, tibia, humerus, and radius. * **Trotter & Glesser:** Considered the most accurate and popular method globally. They developed regression equations based on a large sample (the Terry collection), providing specific formulas for different ethnicities and sexes. * **Steele & McKern:** This method is used for stature estimation specifically from **fragmentary long bones**. It allows forensic experts to calculate height even when the entire length of the bone is not available. **High-Yield Pearls for NEET-PG:** * **Best bone for stature estimation:** Femur (followed by Tibia). * **Fully’s Method:** The only "anatomical" method for stature; it involves summing the measurements of all bones contributing to height (skull to calcaneum) plus a correction factor for soft tissue. * **Multiplication Factor:** A quick bedside method where the length of a long bone is multiplied by a specific factor (e.g., Femur length × 3.7 = Stature).

Question 46: The bore of a gun can be examined by:

A. Broach cutter
B. Helixometer (Correct Answer)
C. Comparison microscope
D. Simple microscope

Explanation: ### Explanation **Correct Answer: B. Helixometer** The **Helixometer** is a specialized optical instrument designed specifically to examine the interior of a firearm's barrel (the bore). It consists of a long, thin tube equipped with a light source and a magnifying lens system. It allows forensic experts to inspect the **rifling** (lands and grooves), measure the pitch of the rifling, and identify internal characteristics such as corrosion, fouling, or manufacturing defects. **Analysis of Incorrect Options:** * **A. Broach cutter:** This is a **manufacturing tool**, not an examination tool. It is used during the rifling process to cut the grooves into the bore of the barrel. * **C. Comparison microscope:** This is the "gold standard" for **ballistics identification**, but it is used to compare two separate specimens (e.g., a test-fired bullet vs. a crime scene bullet) side-by-side to see if they were fired from the same gun. It does not look *inside* the gun barrel itself. * **D. Simple microscope:** A standard microscope lacks the specialized long-reach optics and illumination required to visualize the internal longitudinal surface of a firearm barrel. **High-Yield Facts for NEET-PG:** * **Rifling:** The process of making spiral grooves in the bore to impart spin to the bullet for stability. * **Calibre:** The internal diameter of the barrel measured between two opposite **lands**. * **Dermal Nitrate Test (Paraffin Test):** Used to detect gunpowder residue (nitrates) on the hands of a shooter (though now largely replaced by AAS for lead/antimony). * **Walker’s Test:** Used to detect nitrites around a bullet hole to determine the range of fire.

Question 47: Hasse's formula is used in pregnancy to?

A. Estimate fetal age (Correct Answer)
B. Identify fetal blood group
C. Identify fetal sex
D. Identify fetal congenital malformations

Explanation: **Explanation:** **Hasse’s Formula** (also known as Haase’s Rule) is a classic forensic and obstetric method used to **estimate the age of a fetus** based on its crown-to-heel (CH) length. The formula is applied differently based on the stage of pregnancy: 1. **Before 5 months (1–5 months):** The age in months is the square root of the length in centimeters (Length = Month²). 2. **After 5 months (6–10 months):** The age in months is the length in centimeters divided by 5 (Length = Month × 5). **Why the other options are incorrect:** * **B & C (Fetal Blood Group and Sex):** These are determined by genetic and serological analysis (e.g., amniocentesis, CVS, or non-invasive prenatal testing), not by physical measurements of length. * **D (Congenital Malformations):** These are typically identified via targeted ultrasound (Level II scan) or biochemical markers, whereas Hasse's formula is purely a mathematical estimation of gestational age. **High-Yield Clinical Pearls for NEET-PG:** * **Crown-Heel (CH) Length:** Used in Hasse's formula. In contrast, **Crown-Rump (CR) Length** is the most accurate ultrasound parameter for dating in the first trimester. * **Rule of Threes (Casper’s Rule):** Used to estimate the rate of putrefaction (1 week in air = 2 weeks in water = 8 weeks in earth). Do not confuse this with Hasse’s Rule. * **Balthazard’s Formula:** Used to estimate the age of a fetus based on the weight of the organs or the length of specific bones. * **Viability:** In India, a fetus is legally considered viable at **28 weeks** (though medically it is often 24 weeks). This is a frequent point of correlation in Forensic Medicine.

Question 48: Which of the following is the best method for testing the development of rigor mortis?

A. Opening the lower jaw (Correct Answer)
B. Flexing the elbow joint
C. Flexing the knee joint
D. Allowing the leg to fall from a height

Explanation: **Explanation:** Rigor mortis (post-mortem rigidity) is the stiffening of muscles after death due to the depletion of ATP, which prevents the detachment of actin-myosin cross-bridges. **Why Option A is Correct:** Rigor mortis follows a specific chronological order known as **Nysten’s Law**. It typically appears first in the involuntary muscles (heart), followed by voluntary muscles in a cranio-caudal (downward) direction: eyelids, lower jaw, neck, upper limbs, and finally lower limbs. Since the **lower jaw** is one of the earliest voluntary muscle groups to exhibit rigidity, testing it by attempting to depress the mandible is the most sensitive and "best" clinical method for early detection. **Analysis of Incorrect Options:** * **B & C (Flexing the elbow/knee):** While these joints are used to check for rigor, they are affected much later than the jaw. Rigor reaches the upper limbs (elbow) before the lower limbs (knee), but both are secondary to the facial muscles. * **D (Allowing the leg to fall):** This is not a standard clinical test for rigor mortis. Testing for rigor involves passive movement against resistance; a "falling" limb is more characteristic of the primary flaccidity stage. **NEET-PG High-Yield Pearls:** * **Sequence:** Nysten’s Law (Face → Neck → Trunk → Upper Limbs → Lower Limbs). Note: Rigor also *disappears* in the same order. * **Timeline:** In temperate climates, it usually starts in 1–2 hours, is well-developed in 12 hours, and disappears in 24–36 hours ("Rule of 12"). * **Conditions mimicking Rigor:** Cadaveric spasm (instantaneous), Heat stiffening, and Cold stiffening. * **Biochemical Basis:** Depletion of ATP below 85% of normal levels.

Question 49: Given a Crown Rump Length of 20 cm and a lower limb length of 11 cm, which of the following statements is false?

A. The Rule of Hasse states that the gestational age of a fetus up to 5 months can be estimated by the square root of the crown-heel length.
B. Morrison's rule states that for a fetus after 5 months, the gestational age is calculated as crown-heel length (CHL) divided by 5.
C. Crown-heel length (CHL) is equal to the crown-rump length plus the length of the lower limb.
D. The gestational age of the fetus will be 7-8 months. (Correct Answer)

Explanation: ### Explanation **1. Why Option D is the Correct (False) Statement:** To determine the gestational age, we first calculate the **Crown-Heel Length (CHL)**. * **CHL = Crown-Rump Length (CRL) + Lower Limb Length** * CHL = 20 cm + 11 cm = **31 cm**. According to **Hasse’s Rule**, for a fetus older than 5 months, the gestational age (in months) is calculated by dividing the CHL by 5. * **Age = 31 / 5 = 6.2 months.** Therefore, the statement that the fetus is 7-8 months old is mathematically incorrect (False), making it the right choice for this question. **2. Analysis of Other Options:** * **Option A (True):** Hasse’s Rule states that for the first 5 months, the Age (in months) = $\sqrt{\text{CHL (in cm)}}$. * **Option B (True):** This is the second part of Hasse’s Rule (sometimes referred to in texts alongside Morrison’s observations): for the 6th to 10th month, Age = CHL / 5. * **Option C (True):** Anatomically, the total length of the fetus (Crown-Heel) is the sum of the sitting height (Crown-Rump) and the length of the lower extremities. **3. NEET-PG High-Yield Pearls:** * **Hasse’s Rule Summary:** * Month 1: 1 cm ($\sqrt{1}$) * Month 3: 9 cm ($\sqrt{9}$) * Month 5: 25 cm ($\sqrt{25}$) * Month 6: 30 cm ($6 \times 5$) * Month 10: 50 cm ($10 \times 5$) * **CRL vs. CHL:** CRL (Sitting height) is considered more reliable for age estimation in the first trimester via ultrasound. * **Viability:** In India, legal viability is generally considered at 24 weeks (approx. 6 months).

Question 50: Who first used the fingerprinting technique for criminal cases?

A. Sir Francis Galton
B. Sir William Herschel
C. Sir Edward Henry (Correct Answer)
D. Dr Henry P. DeForest

Explanation: **Explanation:** The correct answer is **Sir Edward Henry**. While several pioneers contributed to the development of dactylography (fingerprinting), Sir Edward Henry is credited with the practical application of fingerprints for **criminal identification**. He developed the "Henry Classification System," which allowed fingerprints to be indexed and retrieved easily. As the Inspector General of Police in Bengal, India, he established the world’s first Fingerprint Bureau in Calcutta (1897) and later introduced the system to Scotland Yard. **Analysis of Incorrect Options:** * **Sir Francis Galton:** He was the first to provide a scientific basis for fingerprinting. He proved their permanence and uniqueness and identified "Galton’s Details" (minutiae), but he did not implement the system for criminal cases. * **Sir William Herschel:** A British administrator in India, he was the first to use fingerprints on **contracts** (civil use) to prevent impersonation, but he did not develop a classification system for criminal records. * **Dr. Henry P. DeForest:** He is credited with the first systematic use of fingerprints in the **United States** (1902) for civil service testing, not the global pioneer of criminal application. **High-Yield NEET-PG Pearls:** * **Father of Fingerprinting:** Sir Francis Galton. * **First Fingerprint Bureau:** Established in **Calcutta, India (1897)**. * **Bertillonage (Anthropometry):** Developed by Alphonse Bertillon; it was the precursor to fingerprinting but was replaced due to inaccuracies (e.g., the Will West case). * **Legal Admissibility:** Fingerprints are permanent (formed at 12–16 weeks of intrauterine life) and unique; even monozygotic twins have different fingerprints.

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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