Identification — MCQs
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Corpus delicti stands for what?
Which of the following is true about a posthumous child?
A convict, whose family or relations were not known and no biological sample was available with jail authorities, escaped from jail. A dead body resembling the convict was found in a nearby forest, but due to mutilation of the face, identity could not be established. Positive identification that the deceased is the same convict who escaped from jail can be established by which of the following methods?
Which test is used to detect the blood group of a blood stain?
What is the total number of teeth typically present in an 11-year-old individual?
What is the multiplication factor used to estimate height from the length of a foot?
At what age does a wisdom tooth typically erupt?
What is the total number of teeth typically present at the age of 12 years?
Dried semen stains on clothing are identified by which method?
At what age does the second molar erupt?
Identification Indian Medical PG Practice Questions and MCQs
Question 181: Corpus delicti stands for what?
- A. Body of court proceedings
- B. Body of offence (Correct Answer)
- C. Body of proof
- D. Body of evidence
Explanation: **Explanation:** **Corpus delicti** is a Latin term that literally translates to **"the body of the crime"** or **"body of offence."** In forensic medicine, it does not necessarily refer to a physical human corpse, but rather to the **objective proof** that a specific crime has been committed. For instance, in a murder case, the dead body is the corpus delicti; in a case of arson, the charred remains of the building constitute the corpus delicti. * **Why Option B is correct:** The legal principle dictates that before a person can be convicted of a crime, it must be proven that the crime actually occurred (e.g., that a death was caused by a criminal act and not by natural causes). * **Why Options A, C, and D are incorrect:** While "proof" and "evidence" are components used to establish the corpus delicti, they are not the literal translation or the legal definition of the term. "Court proceedings" refers to the legal process (litigation) rather than the foundational fact of the crime itself. **High-Yield Facts for NEET-PG:** * **Rule of Corpus Delicti:** A person cannot be convicted based solely on a confession if there is no independent evidence that a crime was committed. * **Disappearance of the Body:** In rare cases, a conviction for murder is possible even if the physical body is missing (e.g., destroyed by acid or disposed of in the sea), provided there is sufficient circumstantial evidence to prove the "body of offence." * **Identification:** In forensic practice, establishing the identity of the corpus delicti (the body) is the first and most crucial step in a death investigation.
Question 182: Which of the following is true about a posthumous child?
- A. Born after the death of the father (Correct Answer)
- B. Stillborn child
- C. Fictitious child
- D. Illegitimate child
Explanation: ### Explanation **Correct Option: A (Born after the death of the father)** A **posthumous child** is defined as a child born after the death of their biological father. In forensic medicine and legal jurisprudence, this concept is significant regarding inheritance rights and the **legitimacy of the child**. According to Section 112 of the Indian Evidence Act, a child is considered legitimate if born within **280 days** of the dissolution of marriage (by death or divorce), provided the mother remains unmarried. **Analysis of Incorrect Options:** * **B. Stillborn child:** This refers to a child born dead after the period of viability (usually 28th week of gestation). In forensics, the **Hydrostatic (Raygat’s) test** is used to differentiate a stillborn from a live-born child. * **C. Fictitious child:** Also known as a **Supposititious child**, this refers to a child presented by a woman as her own to claim inheritance or property, when in fact she did not give birth to it. * **D. Illegitimate child:** This is a child born to parents who are not legally married to each other at the time of birth or conception (outside of the 280-day rule). **High-Yield Clinical Pearls for NEET-PG:** * **Superfecundation:** Fertilization of two ova within the same menstrual cycle by sperm from two different acts of coitus (potentially two different fathers). * **Superfetaion:** Fertilization of two ova in different menstrual cycles (extremely rare in humans). * **Precipitate Labour:** Labour lasting less than 3 hours; carries medico-legal importance in cases of alleged infanticide. * **Viability:** In India, the legal age of viability is generally considered **210 days (7 months)**.
Question 183: A convict, whose family or relations were not known and no biological sample was available with jail authorities, escaped from jail. A dead body resembling the convict was found in a nearby forest, but due to mutilation of the face, identity could not be established. Positive identification that the deceased is the same convict who escaped from jail can be established by which of the following methods?
- A. Blood grouping
- B. DNA profile
- C. Anthropometry (Correct Answer)
- D. HLA typing
Explanation: ### Explanation **1. Why Anthropometry is Correct:** The question describes a scenario where no biological reference samples (DNA or blood) are available from the convict or his relatives. In such a case, **Anthropometry (the Bertillon System)** becomes the definitive method for identification. When a convict enters prison, authorities record specific physical measurements (e.g., height, length of the left foot, length of the middle finger, etc.) and descriptive features (marks, scars). Since these records are already present with the jail authorities, the measurements of the deceased can be compared directly against the convict's prison file. This system, developed by Alphonse Bertillon, relies on the principle that no two individuals have the exact same physical dimensions after the age of 21. **2. Why Other Options are Incorrect:** * **DNA Profile:** While DNA is the "gold standard" for identification, it requires a **reference sample** (either from the individual’s personal belongings or from close biological relatives). The question explicitly states no such samples or relations are available, making DNA profiling impossible. * **Blood Grouping:** Similar to DNA, blood grouping requires a prior record of the convict's blood type or a relative's sample for comparison. Furthermore, blood grouping is not a method of "positive identification" (it can only exclude, not uniquely identify). * **HLA Typing:** This is used for tissue matching in transplants or paternity testing. It also requires reference samples and is not a standard forensic tool for identifying escaped convicts. **3. High-Yield Clinical Pearls for NEET-PG:** * **Bertillonage (Anthropometry):** Consists of three parts: Descriptive data (Portrait Parle), Body measurements, and marks/scars. * **Portrait Parle:** Also known as "Spoken Picture," it is the verbal description of a person's physical features. * **Primary Method of Identification:** While Anthropometry was the first scientific system, it has been largely replaced by **Dactylography (Fingerprinting)**, which is more reliable and easier to perform. * **Age for Anthropometry:** It is only reliable after the age of 21, as bone dimensions change during growth.
Question 184: Which test is used to detect the blood group of a blood stain?
- A. Benzidine test
- B. Takayama test
- C. Luminol test
- D. Absorption elution test (Correct Answer)
Explanation: ### Explanation **Correct Answer: D. Absorption elution test** The **Absorption-elution test** is the most widely used and sensitive method for determining the ABO blood group from dried bloodstains. * **Mechanism:** It relies on the principle that specific antibodies (Anti-A or Anti-B) will bind to their corresponding antigens present on the red cell stroma in the stain (**Absorption**). After washing away unbound antibodies, the temperature is raised (to 56°C), which breaks the antigen-antibody bond, releasing the antibodies into a solution (**Elution**). These eluted antibodies are then identified by adding known indicator red cells (Agglutination). **Analysis of Incorrect Options:** * **A. Benzidine test:** This is a **presumptive (preliminary) test** used to detect the presence of blood. It relies on the peroxidase-like activity of hemoglobin, which turns the reagent blue. It is highly sensitive but not specific. * **B. Takayama test:** Also known as the **Haemochromogen crystal test**, this is a **confirmatory test** to prove a stain is blood. It produces salmon-pink, rhomboid crystals when viewed under a microscope. * **C. Luminol test:** A highly sensitive presumptive test used at crime scenes to detect invisible or cleaned-up blood traces via **chemiluminescence**. It does not determine blood groups. **High-Yield Clinical Pearls for NEET-PG:** * **Absorption-inhibition test:** Another method for blood grouping, but it is less sensitive than absorption-elution and requires more sample material. * **Lattes Crust Method:** Used for blood grouping by detecting **antibodies** in the serum of the stain (whereas Absorption-elution detects **antigens**). * **Species Identification:** To determine if blood is human or animal, the **Precipitin test** or **Coombs consumption test** is used. * **Teichmann Test:** Another confirmatory test for blood that produces dark brown, rhombic **Haemin crystals**.
Question 185: What is the total number of teeth typically present in an 11-year-old individual?
- A. 12
- B. 20
- C. 24 (Correct Answer)
- D. 30
Explanation: **Explanation:** The correct answer is **24**. In Forensic Medicine and Pedodontics, age estimation through dentition follows a predictable chronological sequence. **Why 24 is correct:** By age 11, an individual is in the late phase of **mixed dentition**. At this stage, the child typically possesses: * **8 Incisors** (Permanent) * **4 Canines** (Permanent or late deciduous being replaced) * **8 Premolars** (Replacing deciduous molars) * **4 First Molars** (Permanent; erupted at age 6) Total = **24 teeth**. The second permanent molars usually erupt at age 12 ("12-year molars"), bringing the count to 28. Therefore, at 11 years, the count remains at 24. **Analysis of Incorrect Options:** * **A. 12:** This number does not correspond to any standard developmental milestone. * **B. 20:** This represents the complete set of **deciduous (milk) teeth**, typically present between ages 2 and 6. * **D. 30:** This is an incorrect count. A full permanent set is 28 (excluding wisdom teeth) or 32 (including wisdom teeth). **High-Yield Clinical Pearls for NEET-PG:** * **First Permanent Tooth:** Mandibular 1st Molar (6 years). * **First Deciduous Tooth:** Lower Central Incisor (6–8 months). * **Mixed Dentition Period:** 6 to 12 years. * **Gustafson’s Method:** Used for age estimation from a single tooth in adults (parameters: Sclerosis, Attrition, Periodontitis, Cementum apposition, Root resorption, Secondary dentin). * **Demirjian’s Method:** A common radiographic method for age estimation based on crown and root formation stages.
Question 186: What is the multiplication factor used to estimate height from the length of a foot?
- A. 5
- B. 6
- C. 7 (Correct Answer)
- D. 8
Explanation: **Explanation:** The estimation of stature (height) from various body parts is a fundamental aspect of forensic anthropology and identification. The correct answer is **7** because of a well-established anthropometric relationship known as the **Foot-Height Ratio**. 1. **Why Option C is Correct:** Extensive forensic studies (notably by researchers like Barberio) have established that the length of a human foot is approximately **15% of the total body height**. Mathematically, this translates to a multiplication factor of roughly **6.6 to 7**. In forensic practice and competitive exams, the integer **7** is the standard multiplication factor used to estimate height from foot length (Stature = Foot length × 7). 2. **Why Other Options are Incorrect:** * **Option A (5):** This factor is too low and would significantly underestimate height. No major long bone or body part uses 5 as a primary multiplier. * **Option B (6):** While closer to the actual ratio (6.6), 6 is not the standard convention used in forensic textbooks for foot length. * **Option D (8):** A factor of 8 is generally associated with the "Head-Height Ratio," where the total height of an adult is approximately 7.5 to 8 times the height of the head (Vertex to Mentum). **High-Yield Clinical Pearls for NEET-PG:** * **Humulus Multiplier:** This is the most common method for estimating stature from long bones (e.g., Femur, Humerus) when the sex and race are known. * **Hand Length:** The height of an individual is approximately **9 times** the length of the hand (from the wrist crease to the tip of the middle finger). * **Symphysis Pubis to Heel:** This distance is exactly **half** of the total stature in a fully grown adult. * **Arm Span:** In adults, the distance between the tips of the middle fingers with arms outstretched is roughly equal to the total height.
Question 187: At what age does a wisdom tooth typically erupt?
- A. 6-8 years
- B. 10-12 years
- C. 12-15 years
- D. 17-20 years (Correct Answer)
Explanation: **Explanation:** The eruption of teeth is a vital parameter in forensic age estimation. The **wisdom tooth (third molar)** is the last tooth to erupt in the human oral cavity. **1. Why Option D is Correct:** The third molar typically erupts between **17 and 25 years** of age (most commonly cited as 17–21 years in forensic literature). Since it appears during the transition to adulthood, it is a key medicolegal marker for determining if an individual has attained the age of majority (18 years). **2. Why Other Options are Incorrect:** * **Option A (6-8 years):** This period marks the eruption of the **first permanent molars** (6 years) and central incisors. The first molar is often called the "6-year molar." * **Option B (10-12 years):** This is the time for the eruption of premolars and canines. * **Option C (12-15 years):** The **second permanent molars** typically erupt at 12–14 years. They are often referred to as the "12-year molars." **3. High-Yield Clinical Pearls for NEET-PG:** * **Sequence of Permanent Teeth:** M1, I1, I2, P1, P2, C, M2, M3 (Mnemonic: **Mama Is In Pain, Papa Can’t Make Money**). * **Demirjian’s Method:** The most widely used radiographic method for age estimation based on tooth development. * **Gustafson’s Method:** Used for age estimation in adults (post-mortem) by examining six dental changes (Sclerosis, Secondary dentin, Cementum apposition, Attrition, Periodontosis, Root resorption). * **Rule of Four:** A quick guide for deciduous teeth eruption (starts at 6–7 months with lower central incisors).
Question 188: What is the total number of teeth typically present at the age of 12 years?
- A. 12
- B. 20
- C. 24 (Correct Answer)
- D. 30
Explanation: ### Explanation **Correct Answer: C (24)** The age of 12 years is a significant milestone in dental development, often referred to as the **"Second Molar Stage."** At this age, the second permanent molars typically erupt. **Why 24 is correct:** By age 12, a child has usually shed all primary (deciduous) teeth and replaced them with permanent successors. The dental formula for a 12-year-old includes: * 8 Incisors * 4 Canines * 8 Premolars * 4 Second Molars (newly erupted) * **Total: 24 teeth.** The third molars (wisdom teeth) have not yet erupted, and the first molars were already present from age 6. **Analysis of Incorrect Options:** * **Option A (12):** This number does not correspond to any standard developmental milestone. By age 6-7, a child already has approximately 24 teeth (20 deciduous + 4 permanent first molars). * **Option B (20):** This represents the complete set of **deciduous (milk) teeth**, usually fully erupted by age 2.5 to 3 years. * **Option D (30):** This is an incorrect intermediate number. The next jump after 24 is to **28 teeth** (at age 13-14) and finally **32 teeth** once the third molars erupt (usually between 17–25 years). **High-Yield Clinical Pearls for NEET-PG:** * **6-Year Molar:** The first permanent molar is the first permanent tooth to erupt (at age 6) and is often called the "key to occlusion." * **Mixed Dentition Period:** Occurs between ages 6 and 12. * **Gustafson’s Method:** The most reliable method for age estimation from teeth in adults (uses six parameters: Scurvy, Attrition, Periodontitis, Secondary dentin, Cementum apposition, Root resorption). * **Demirjian’s Method:** A common radiographic method for age estimation based on stages of tooth mineralization.
Question 189: Dried semen stains on clothing are identified by which method?
- A. UV light (Correct Answer)
- B. Spectroscopy
- C. Magnifying lens
- D. Infrared light
Explanation: **Explanation:** **1. Why UV Light is Correct:** Dried semen stains exhibit a characteristic **bluish-white fluorescence** when exposed to **Ultraviolet (UV) light** (specifically using a Wood’s lamp). This phenomenon occurs due to the presence of substances like **flavins and choline** in the seminal fluid. In forensic practice, this is the primary screening method used at a crime scene to locate potential stains on clothing, bedding, or skin before proceeding to confirmatory chemical or microscopic tests. **2. Why Other Options are Incorrect:** * **Spectroscopy (B):** While spectroscopy is used in forensic toxicology to identify poisons or drugs, it is not a standard primary method for locating or identifying semen stains on fabric. * **Magnifying Lens (C):** A magnifying lens can help identify the "starchy" feel or physical crusting of a stain, but it cannot differentiate semen from other dried body fluids (like starch or vaginal discharge) which may look similar to the naked eye. * **Infrared Light (D):** IR light is typically used for detecting bloodstains on dark fabrics or visualizing gunshot residue, but it does not cause the specific fluorescence required to identify semen. **3. High-Yield Clinical Pearls for NEET-PG:** * **Screening Test:** UV light fluorescence (Preliminary/Physical test). * **Chemical Tests:** * **Acid Phosphatase Test (Brentamine test):** Most common screening chemical test. Semen contains high levels of acid phosphatase. * **Barberio’s Test:** Produces yellow needle-shaped crystals (Spermine picrate). * **Florence Test:** Produces dark brown rhombic crystals (Choline periodide). * **Confirmatory Test:** Microscopic identification of **Spermatozoa** (using Christmas Tree stain). * **Specific Marker:** **PSA (Prostate-Specific Antigen) / p30** is the most reliable marker for semen, even in vasectomized (azoospermic) males.
Question 190: At what age does the second molar erupt?
- A. 6 years
- B. 12 years (Correct Answer)
- C. 18 to 22 years
- D. 25 to 28 years
Explanation: **Explanation:** The eruption of permanent teeth is a critical parameter in forensic age estimation during late childhood and adolescence. The **second permanent molar** typically erupts at **12 years** of age. Because of this consistent timing, it is often referred to as the **"12-year molar."** **Analysis of Options:** * **A. 6 years:** This is the age for the eruption of the **first permanent molar**. It is the first permanent tooth to appear in the oral cavity and is often called the "6-year molar." * **B. 12 years (Correct):** The second permanent molar erupts at this stage. By this age, most deciduous teeth have been replaced by permanent successors (except for the third molars). * **C. 18 to 22 years:** This is the typical range for the eruption of the **third molar (wisdom tooth)**. It is the last tooth to erupt and is highly variable. * **D. 25 to 28 years:** This is beyond the physiological age for normal dental eruption. If third molars have not erupted by age 25, they are often considered impacted or congenitally absent. **High-Yield NEET-PG Pearls:** 1. **Sequence of Permanent Eruption:** M1 (6y) → I1 (7y) → I2 (8y) → P1 (9y) → P2 (10y) → C (11y) → **M2 (12y)** → M3 (18-25y). (Note: M=Molar, I=Incisor, P=Premolar, C=Canine). 2. **Rule of Four:** Deciduous teeth usually begin erupting at 6–7 months (lower central incisors) and are complete by 2.5 to 3 years. 3. **Gustafson’s Method:** Used for age estimation in adults based on six dental changes (Attrition, Periodontosis, Secondary dentin, Cementum apposition, Root resorption, and Transparency). 4. **Demirjian’s Method:** A more accurate radiographic method for age estimation based on stages of tooth mineralization.
Practice by Chapter
Personal Identification Methods
Practice Questions
Anthropometry
Practice Questions
Dactylography (Fingerprinting)
Practice Questions
Dental Identification
Practice Questions
DNA Profiling
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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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