FMGE 2024 - Forensic Medicine PYQs Practice Questions

Q: During measurement of a rifled barrel weapon, the caliber depends on?

Distance between two opposite lands. ***Distance between two opposite lands***- The **caliber** of a rifled firearm refers to the nominal diameter of the gun barrel's bore, measured between the two opposing **lands**.- The land is the raised shoulder between the grooves in a rifled barrel; measuring the distance across the lands provides the smallest internal diameter of the barrel.*Distance between two opposite grooves*- This measurement corresponds to the **groove diameter**, which typically determines the required diameter of the projectile (the bullet).- While related to bullet fit, the distance across the grooves is generally greater than the caliber and is not the accepted definition of the weapon's caliber.*Number of lead pellets*- The number of lead pellets (or 'shot') is relevant to **shotguns** (which typically have smooth bores), not rifled weapons.- This measurement relates to the load of a shell and the **gauge** of a shotgun, not the caliber of a rifled barrel weapon.*Mass and velocity*- **Mass** and **velocity** are dynamic characteristics of the projectile (internal ballistics), determining the energy and momentum of the shot.- These parameters are influenced by the cartridge load but do not define the fixed mechanical dimension (**caliber**) of the barrel. [Practice more Forensic Medicine PYQs on OnCourse]

Q: During the forensic examination of semen from a rape victim, the identification of distinctive yellow needle-like crystals raises attention. What is the specific test employed to confirm the presence of semen?

Barberio test. ***Barberio test***- This test is a classical **presumptive chemical test** for semen, based on the detection of **spermine**, a polyamine found in high concentration in seminal fluid.- It involves reacting the semen extract with **picric acid**, which leads to the formation of characteristic insoluble **yellow needle-like crystals** known as **spermine picrate**.*Acid phosphatase test*- This is a highly sensitive **presumptive test** for semen which detects the high concentration of the enzyme **prostatic acid phosphatase (PAP)**.- A positive result is indicated by a **rapid color change** (often purple or reddish-purple), not the formation of specific yellow crystalline structures.*Papanicolaou smear*- The Pap smear is fundamentally a **staining technique** (cytological stain), mainly used to visualize and identify **epithelial cells** and **spermatozoa** under a microscope.- While it is used on swabs from rape victims to definitively identify the **sperm cell heads**, it is not a chemical test that yields distinctive yellow crystals.*Florence test*- The Florence test is another traditional **presumptive test** that detects **choline**, another component of semen.- It reacts with potassium iodide and acetic acid to form **choline periodide**, resulting in dark **brown, rhombic**, or needle-like crystals, which are distinct from the yellow crystals of the Barberio test. [Practice more Forensic Medicine PYQs on OnCourse]

Q: A person who was mentally unsound at the time of committing a crime is exempt from liability if they were unaware of the nature of their actions or its consequences. What is this principle called?

McNaughton rule. ***McNaughton rule (M'Naghten rule)*** - This is the **correct answer** as it establishes the legal test for insanity defense based on whether the accused was aware of the **nature and quality of the act** or knew it was **wrong** - Originated from the **1843 case of Daniel M'Naghten** in England and remains the most widely used insanity defense standard - Key principle: A person is not criminally responsible if, at the time of committing the act, they were **laboring under such a defect of reason from disease of the mind** as to not know the nature and quality of the act or that it was wrong - Applied in **India under Section 84 of the Indian Penal Code** *Durham's rule (Product test)* - This rule states that an accused is not criminally responsible if the unlawful act was the **"product of mental disease or defect"** - Much broader than M'Naghten rule - Used briefly in US courts but largely abandoned due to being too broad *Currens rule* - This test focuses on whether the defendant had the **capacity to conform their conduct** to the requirements of law - Emphasizes volitional control rather than cognitive understanding - Less commonly used standard *Irresistible impulse test* - This is a **supplementary test** that asks whether the defendant could **control their actions** even if they knew they were wrong - Addresses volitional incapacity rather than cognitive incapacity - Does not match the question's emphasis on "unaware of nature or consequences" [Practice more Forensic Medicine PYQs on OnCourse]

Q: A family died in a closed room that was full of smoke from a wood fire. Which of the following findings is likely to be seen on the body?

A. Cherry red hypostasis. ***A. Cherry red hypostasis*** - Carbon monoxide (CO) from incomplete combustion of wood binds to hemoglobin with ~240 times greater affinity than oxygen, forming **carboxyhemoglobin (COHb)** - COHb has a characteristic **bright cherry-red or pink color**, which manifests as cherry-red hypostasis (post-mortem lividity) and pink coloration of internal organs - This is the **pathognomonic post-mortem finding** in CO poisoning deaths - Levels >50% COHb are typically fatal *B. Cyanosis* - Cyanosis (bluish discoloration) occurs when deoxygenated hemoglobin exceeds 5 g/dL - **Not seen in CO poisoning** because carboxyhemoglobin remains bright red, giving a pink appearance rather than blue - The victim may appear "healthy" or flushed despite being dead *C. Blackish discoloration* - Not a characteristic finding in CO poisoning - May be seen in putrefaction or certain chemical poisonings, but not acute CO exposure *D. Brown colored pigmentation* - Not associated with CO poisoning - Brown discoloration might suggest methemoglobinemia or post-mortem changes, but not CO toxicity [Practice more Forensic Medicine PYQs on OnCourse]

Question 1

During measurement of a rifled barrel weapon, the caliber depends on?

Accepted Answer

Distance between two opposite lands

Answer

Distance between two opposite grooves

Answer

Mass and velocity

Answer

Number of lead pellets

Question 2

During the forensic examination of semen from a rape victim, the identification of distinctive yellow needle-like crystals raises attention. What is the specific test employed to confirm the presence of semen?

Accepted Answer

Barberio test

Answer

Acid phosphatase test

Answer

Papanicolaou smear

Answer

Florence test

Question 3

A person who was mentally unsound at the time of committing a crime is exempt from liability if they were unaware of the nature of their actions or its consequences. What is this principle called?

Accepted Answer

McNaughton rule

Answer

Durham's rule

Answer

Currens rule

Answer

Irresistible impulse test

Question 4

A family died in a closed room that was full of smoke from a wood fire. Which of the following findings is likely to be seen on the body?

Accepted Answer

A. Cherry red hypostasis

Answer

D. Brown colored pigmentation

Answer

B. Cyanosis

Answer

C. Blackish discoloration

FMGE 2024 — Forensic Medicine