NEET-PG 2012 - Forensic Medicine Practice Questions

Q: Dirt collar or grease collar is seen in which type of wound?

Firearm entry wound. ***Firearm entry wound*** - A **dirt collar** or **grease collar** is a characteristic finding in a **firearm entry wound**, caused by the wiping off of dirt, lubricant, and other residues from the projectile as it penetrates the skin. - This reddish-brown to black ring around the wound entrance is a crucial indicator of the **direction of fire** and the nature of the injury. *Punctured wound by sharp weapon* - This type of wound is characterized by a small, deep opening caused by a sharp, pointed object, and typically lacks the **residue collection** that forms a dirt or grease collar. - While there may be some contamination, it does not form a distinct, recognizable collar as seen with firearm projectiles. *Lacerated wound* - A lacerated wound is an irregular tear in the skin caused by a blunt force trauma, characterized by **jagged edges** and often bridging tissue. - These wounds are not typically associated with a "dirt collar" as they are due to tearing rather than a projectile wiping off material. *Stab wound* - A stab wound is caused by a sharp object penetrating the skin, with depth greater than width, and is defined by its clean-cut edges. - While there might be some *foreign material* deposited, it does not present as a distinct **grease or dirt collar** because the mechanism of injury (cutting/stabbing) differs from that of a bullet.

Q: Disputed maternity can be solved by using the following tests, EXCEPT:

Precipitin test. ***Precipitin test*** - The **precipitin test** is used to determine the origin of a **blood sample**, specifically whether it is **human or animal blood**, by detecting species-specific proteins. It is not used for assessing maternity. - This test is primarily employed in **forensic serology** to differentiate between blood from different animal species, making it irrelevant for paternity or maternity disputes. *Blood grouping* - **Blood grouping** (e.g., ABO and Rh systems) can be used to **exclude paternity or maternity** by comparing the blood types of the child, mother, and alleged father. - If the child's blood type is incompatible with the alleged parents based on Mendelian inheritance, one or both can be excluded. *HLA typing* - **HLA typing** (Human Leukocyte Antigen) is a more powerful genetic marker system than ABO/Rh for determining paternity or maternity. - It involves analyzing highly polymorphic genes on chromosome 6 that encode cell surface proteins, providing a more definitive means of **inclusion or exclusion**. *DNA fingerprinting* - **DNA fingerprinting** (also known as **DNA profiling**) is the **most accurate and widely accepted method** for resolving paternity and maternity disputes. - It analyzes highly variable regions of DNA unique to each individual, providing a statistically strong basis for **inclusion or exclusion** by comparing genetic profiles.

Q: Which of the following sources provides the highest yield and most reliable samples for DNA fingerprinting?

Blood. ***Blood*** - **Blood** provides a high concentration of **nucleated cells** (e.g., white blood cells), yielding abundant and high-quality DNA. - The DNA obtained from blood is typically well-preserved and less prone to degradation or contamination compared to other sources. *Saliva* - While saliva contains DNA from **buccal epithelial cells** and white blood cells, its DNA yield can be lower and more variable due to mucous and bacterial contamination. - DNA from saliva may be more subject to degradation, especially if not collected and stored properly. *Tooth* - **Teeth** can be a good source of DNA, particularly from the **pulp**, but extraction can be challenging and destructive. - The DNA yield varies depending on the tooth's condition and the extraction method, and it is generally reserved for situations where other sources are unavailable or severely degraded. *Buccal mucosa* - **Buccal mucosa** swabs are a common and non-invasive source of DNA from **epithelial cells**. - While suitable for many applications, the DNA yield can be lower than blood, and the sample may be more susceptible to surface contamination.

Q: Gastric lavage is contraindicated in which of the following?

Kerosene poisoning. ***Kerosene poisoning*** - Gastric lavage is contraindicated in **kerosene poisoning** due to the high risk of **aspiration pneumonitis**. - Kerosene is a **hydrocarbon**, and aspiration of even small amounts can cause severe lung damage. *Arsenic poisoning* - **Gastric lavage** can be performed in arsenic poisoning, especially if the ingestion occurred recently, to remove unabsorbed toxin. - Activated charcoal is less effective for arsenic, making lavage a more relevant intervention in acute settings. *Organophosphorus Poisoning* - Gastric lavage is generally recommended within an hour of ingestion for **organophosphorus poisoning** to remove the toxic substance. - This helps reduce systemic absorption and mitigate the severe **cholinergic crisis** caused by these agents. *Dhatura poisoning* - **Gastric lavage** is indicated in dhatura poisoning, particularly if presenting within a few hours of ingestion, to remove unabsorbed **atropine-like alkaloids**. - This helps in reducing the **anticholinergic effects** and improving patient outcomes.

Q: La facies sympathique is seen in ?

Hanging. ***Hanging*** - **La facies sympathique** is a term used to describe the facial appearance in cases of **hanging**, characterized by a serene or peaceful look often associated with venous congestion rather than extreme distress. - This appearance is due to the obstruction of venous return from the head while arterial supply continues for a short period, leading to a relatively natural facial expression. *Strangulation* - **Strangulation** typically results in a more dramatic and distressed facial appearance, often with prominent signs of struggle, petechial hemorrhages, and cyanosis. - The compression of both arteries and veins, along with the trachea, leads to rapid and severe cerebral anoxia and overt signs of asphyxia. *Myocardial insufficiency* - **Myocardial insufficiency** (heart failure) usually presents with signs of impaired circulation, such as pallor, cyanosis (especially acrocyanosis), edema, and shortness of breath, but not a specific "sympathetic facies." - The facial expression would more likely reflect distress from dyspnea or discomfort rather than a serene appearance. *Railway accident* - Fatalities from **railway accidents** typically involve severe trauma, disfigurement, and extensive injuries to the head and body. - The facial appearance in such cases would be consistent with massive blunt force trauma, lacerations, or crush injuries, which are inconsistent with "la facies sympathique."

Q: In medical negligence cases, what is the primary role of the plaintiff?

Files case in civil court. ***Files case in civil court*** - The **plaintiff** is the party who initiates a lawsuit, claiming to have been harmed by the actions of another party. - In medical negligence cases, this typically involves someone who alleges injury due to substandard medical care and seeks **compensation** through the legal system. - Filing the case in civil court is the **primary and defining role** of the plaintiff. *Acts as defender* - The **defender** (or defendant) is the party against whom a lawsuit is brought, and they are responsible for responding to the plaintiff's claims. - In medical negligence, the healthcare provider accused of negligence would be the defender. *Gives judgement* - Giving judgment is the function of the **court** or judge and is a neutral adjudication of the facts and application of the law. - The plaintiff's role is to present their case and evidence to persuade the court, not to issue the final decision. *Issues summons to defendant* - Issuing summons is a **court function**, not the plaintiff's role. - The court issues summons after the plaintiff files the case, directing the defendant to appear and respond to the allegations.

Q: Which of the following is NOT considered a grievous injury?

Breast contusion. ***Breast contusion*** - A breast contusion, while painful, is generally a **minor injury** that typically resolves without long-term significant functional impairment or disfigurement. - It does not meet the criteria for a grievous injury under **IPC Section 320**, which requires severe, lasting physical harm or functional loss. *Multiple facial scars* - Multiple facial scars can lead to significant and **permanent disfigurement of the face**, which is explicitly listed as a grievous injury under IPC Section 320. - Such scarring can have profound psychological impacts and may require extensive reconstructive surgery. *Femur fracture* - A femur fracture is a **grievous injury** under IPC Section 320 as it constitutes a **"fracture or dislocation of a bone."** - Additionally, it results in **severe pain**, prolonged disability, and often requires extensive medical intervention including surgery, with potential for protracted loss of use of a limb. *Emasculation injury* - Emasculation refers to the **removal or destruction of male reproductive organs**, which is explicitly listed as a grievous injury under IPC Section 320. - This type of injury results in **permanent impairment of reproductive powers** and qualifies as privation of a member or joint.

Q: Widmark's formula helps in the measurements of blood level of:

Alcohol. ***Alcohol*** - **Widmark's formula** is a widely used method to estimate an individual's **blood alcohol concentration (BAC)** based on the amount of alcohol consumed, body weight, and gender. - This formula helps in forensic toxicology and clinical settings to assess the level of **intoxication**. *Barbiturate drugs* - The levels of **barbiturate drugs** are typically measured using techniques like **gas chromatography-mass spectrometry (GC-MS)** or **high-performance liquid chromatography (HPLC)**. - While various formulas might exist for pharmacokinetic modeling of specific drugs, Widmark's formula is not applicable to barbiturates. *Cocaine derivatives* - **Cocaine and its metabolites** (e.g., benzoylecgonine) are detected and quantified in biological samples (blood, urine) using analytical methods such as **immunoassay**, **GC-MS**, or **LC-MS/MS**. - Widmark's formula is specific to alcohol metabolism and distribution, not cocaine. *Benzodiazepine medications* - The measurement of **benzodiazepine concentrations** in blood is predominantly done using **chromatographic methods** (e.g., GC-MS, LC-MS/MS) due to their complex metabolism and structural diversity. - Widmark's formula is not designed to calculate levels of benzodiazepines.

Q: In a case of hanging, the ligature marks on the neck are an example of which type of injury?

Printed abrasion. ***Printed abrasion*** - Ligature marks in hanging specifically refer to a type of **abrasion** where the pattern or texture of the ligature (rope, cord, etc.) is imprinted onto the skin. - This occurs due to the **pressure and friction** of the ligature against the epidermis, causing superficial scraping and leaving a distinct pattern. *Contusion* - A **contusion**, or bruise, results from bleeding into the tissues as a consequence of blunt trauma, causing discoloration of the skin. - While some mild bruising might coexist with ligature marks, the primary and distinctive injury from a ligature is an abrasion of the skin surface, not solely bleeding underneath. *Laceration* - A **laceration** is a tear or cut in the skin and underlying tissues typically caused by the forceful impact of a blunt object or shear forces. - Ligature marks from hanging are generally superficial skin injuries and do not involve deep tearing of tissues typical of a laceration. *Bruise* - A **bruise** is another term for a contusion, involving hemorrhage into the tissues without breaking the skin. - While bleeding may occur under the ligature mark, the defining characteristic of the mark itself is the superficial scraping or impression on the skin surface, which is an abrasion, not primarily a bruise.

Q: Which of the following is true about cadaveric spasm?

Some particular group of muscles are involved. ***Some particular group of muscles are involved*** - **Cadaveric spasm** is characteristically a **localized or partial phenomenon**, typically affecting specific muscle groups that were in intense contraction at the moment of death. - Classic examples include **hand gripping a weapon** (homicide/suicide), **clutching grass or mud** (drowning), or **specific limb muscles** during extreme physical exertion. - While generalized cadaveric spasm can theoretically occur, it is **usually partial and localized** to the muscles involved in the terminal activity. - This is a key distinguishing feature used in **medico-legal investigations** to determine circumstances of death. *Occurs 2-3 h after death* - This describes the typical onset of **rigor mortis**, which begins 2-3 hours post-mortem and follows a predictable progression. - **Cadaveric spasm** occurs **instantaneously at the moment of death** with **no flaccid interval**, unlike rigor mortis which has a pre-rigor flaccid phase. *Disappears with rigor mortis* - This is **incorrect**. Cadaveric spasm does **not disappear** when rigor mortis develops. - Instead, cadaveric spasm **persists and merges into rigor mortis**, becoming indistinguishable from it once rigor mortis is fully established. - Both cadaveric spasm and rigor mortis eventually resolve together during the **resolution phase** (24-36 hours post-mortem), not separately. *Involves involuntary muscles* - **Cadaveric spasm** affects only **voluntary (skeletal) muscles** under conscious control. - Involuntary muscles such as cardiac muscle and smooth muscles of internal organs are **not involved** in cadaveric spasm.

Question 1

Dirt collar or grease collar is seen in which type of wound?

Accepted Answer

Firearm entry wound

Answer

Lacerated wound

Answer

Stab wound

Answer

Punctured wound by sharp weapon

Question 2

Disputed maternity can be solved by using the following tests, EXCEPT:

Accepted Answer

Precipitin test

Answer

Blood grouping

Answer

HLA typing

Answer

DNA fingerprinting

Question 3

Which of the following sources provides the highest yield and most reliable samples for DNA fingerprinting?

Accepted Answer

Blood

Answer

Saliva

Answer

Tooth

Answer

Buccal mucosa

Question 4

Gastric lavage is contraindicated in which of the following?

Accepted Answer

Kerosene poisoning

Answer

Organophosphorus Poisoning

Answer

Dhatura poisoning

Answer

Arsenic poisoning

Question 5

La facies sympathique is seen in ?

Accepted Answer

Hanging

Answer

Strangulation

Answer

Myocardial insufficiency

Answer

Railway accident

Question 6

In medical negligence cases, what is the primary role of the plaintiff?

Accepted Answer

Files case in civil court

Answer

Acts as defender

Answer

Gives judgement

Answer

Issues summons to defendant

Question 7

Which of the following is NOT considered a grievous injury?

Accepted Answer

Breast contusion

Answer

Multiple facial scars

Answer

Femur fracture

Answer

Emasculation injury

Question 8

Widmark's formula helps in the measurements of blood level of:

Accepted Answer

Alcohol

Answer

Barbiturate drugs

Answer

Cocaine derivatives

Answer

Benzodiazepine medications

Question 9

In a case of hanging, the ligature marks on the neck are an example of which type of injury?

Accepted Answer

Printed abrasion

Answer

Laceration

Answer

Bruise

Answer

Contusion

Question 10

Which of the following is true about cadaveric spasm?

Accepted Answer

Some particular group of muscles are involved

Answer

Occurs 2-3 h after death

Answer

Involves involuntary muscles

Answer

Disappears with rigor mortis

NEET-PG 2012 — Forensic Medicine