Injuries and Their Significance — MCQs

Injuries and Their Significance Indian Medical PG Practice Questions and MCQs

Question 81: Cutis anserina is seen in which of the following conditions?

A. Drowning (Correct Answer)
B. Suffocation
C. Lust murder
D. Electrocution

Explanation: **Explanation:** **Cutis Anserina** (also known as "Gooseflesh" or "Goosebumps") is a characteristic finding in deaths due to **Drowning**. 1. **Why Drowning is Correct:** Cutis anserina occurs due to the contraction of the **arrector pili muscles** at the base of hair follicles. In drowning, this is primarily a post-mortem phenomenon caused by **rigor mortis** affecting these tiny muscles. It can also be triggered by the sudden exposure to cold water (cold shock) just before death. It results in a granular, puckered appearance of the skin, most prominent on the limbs. 2. **Why Other Options are Incorrect:** * **Suffocation:** This is a form of asphyxia where the primary findings are cyanosis, visceral congestion, and Petechial hemorrhages (Tardieu spots), but it does not typically involve cutis anserina. * **Lust Murder:** This refers to homicides with a sexual motive. While various injuries (bite marks, genital trauma) are seen, cutis anserina is not a diagnostic feature of this manner of death. * **Electrocution:** The hallmark of electrocution is the **Joule burn** (electric entry mark), characterized by a central crater with charred edges and peripheral pallor. **High-Yield Clinical Pearls for NEET-PG:** * **Specificity:** Cutis anserina is **not a pathognomonic sign** of drowning; it can occur in any body exposed to cold temperatures post-mortem (algor mortis). * **Other Drowning Signs:** Look for **Washerwoman’s hand** (skin bleaching/wrinkling from maceration) and **Froth at the mouth/nostrils** (fine, white, leathery, and persistent). * **Cadaveric Spasm:** If a person grasps weeds or sand from the water bed, it is the most certain sign that the person was alive when they entered the water.

Question 82: Falangais is a form of punishment involving beating on the soles with a blunt object. What is the typical instrument used?

A. Blunt object (Correct Answer)
B. Palms
C. Fists
D. Sole of shoe

Explanation: **Explanation:** **Falanga** (also known as *falaka* or *bastinado*) is a specific form of torture or corporal punishment characterized by repeated beating on the soles of the feet. 1. **Why the Correct Answer is Right:** The hallmark of Falangais is the use of a **blunt object** (such as a wooden rod, cane, or iron bar) to strike the soles. The medical significance lies in the mechanism of injury: the blunt force causes severe soft tissue trauma, including deep bruising, edema, and potential compartment syndrome of the foot, while often leaving the skin intact. This makes it a preferred method of torture as it causes excruciating pain and disability without leaving obvious external scars initially. 2. **Why Other Options are Incorrect:** * **Palms and Fists:** While these are used in other forms of physical abuse (like "slapping" or "punching"), they lack the mechanical leverage and density required to produce the specific deep-tissue crush injuries characteristic of Falangais. * **Sole of shoe:** While a shoe can be a blunt object, the classic definition of Falangais specifically refers to the use of an external handheld implement (rod/stick) while the victim's feet are often immobilized. 3. **NEET-PG High-Yield Pearls:** * **Clinical Presentation:** Victims may present with "closed degloving" injuries where the skin is separated from the underlying fascia. * **Long-term Sequelae:** Chronic pain, gait abnormalities, and "Haglund’s deformity" (though more commonly associated with shoes, chronic foot trauma can lead to various exostoses). * **Forensic Significance:** It is a classic example of "torture without marks" (initially), but MRI or ultrasound can reveal deep myofascial damage and fibrosis in chronic cases. * **Related Term:** *Telephoning* is another torture method involving repeated slaps to the ears, causing tympanic membrane rupture.

Question 83: True about rigor mortis?

A. Does not occur in a fetus less than 7 months. (Correct Answer)
B. Involves voluntary muscles only.
C. Lasts for 12-24 hours in summer.
D. Starts in the chin.

Explanation: ### Explanation **Correct Option: A. Does not occur in a fetus less than 7 months.** Rigor mortis (post-mortem rigidity) is the stiffening of muscles after death due to the depletion of **ATP**. For rigor mortis to manifest, there must be a sufficient amount of muscle mass and glycogen stores. In a fetus less than 7 months of age (pre-viable), the muscular development is insufficient to produce a detectable stiffening. Therefore, rigor mortis is generally absent in very young fetuses. **Analysis of Incorrect Options:** * **B. Involves voluntary muscles only:** This is incorrect. Rigor mortis involves **all muscles** of the body, including both voluntary (skeletal) and involuntary (smooth and cardiac) muscles. In fact, it often appears first in the heart (cardiac muscle). * **C. Lasts for 12–24 hours in summer:** This is incorrect. In tropical climates like India, the entire process (onset to disappearance) usually follows the **12-12-12 rule**: 12 hours to set in, 12 hours to stay, and 12 hours to disappear. Thus, it typically lasts for about **24–36 hours** total. Heat accelerates the process, making it disappear faster than in winter. * **D. Starts in the chin:** This is incorrect. According to **Nysten’s Law**, rigor mortis follows a proximo-distal progression. It is first visible in the **eyelids**, followed by the lower jaw (chin), neck, upper limbs, trunk, and finally the lower limbs. **High-Yield Clinical Pearls for NEET-PG:** * **Nysten’s Law:** Describes the sequential appearance of rigor mortis (Eyelids → Jaw → Neck → Limbs). * **Cadaveric Spasm:** A condition often confused with rigor mortis; it is instantaneous and occurs in cases of sudden death involving intense emotion or physical stress (e.g., drowning, firearm suicide). * **Conditions accelerating Rigor:** Fever, cholera, tetanus, strychnine poisoning, and intense physical activity before death. * **Conditions delaying Rigor:** Cold climate, asphyxia, and wasting diseases.

Question 84: What is the composition of a primer?

A. Lead peroxide
B. Lead tetrazine
C. Barium nitrate
D. All of the above (Correct Answer)

Explanation: **Explanation:** In forensic ballistics, the **primer** is a small copper or brass cup located at the base of a cartridge. Its primary function is to provide the initial spark or flame required to ignite the main propellant (gunpowder) when struck by the firing pin. The composition of a modern primer is a complex mixture designed to be pressure-sensitive and chemically stable. The correct answer is **D (All of the above)** because a standard primer typically contains three essential components: 1. **Lead Tetrazine (Initiator):** This is the primary explosive that is highly sensitive to mechanical shock. It detonates upon impact from the firing pin. 2. **Barium Nitrate (Oxidizer):** This provides the oxygen necessary for the rapid combustion of the fuel, ensuring the flame is intense and sustained. 3. **Antimony Sulfide (Fuel):** (Often used alongside Lead Peroxide or other oxidizers). **Lead Peroxide** acts as an additional oxidizing agent or sensitizer in various primer formulations to enhance the reaction. **Why other options are not "wrong" but incomplete:** Options A, B, and C are all individual chemical constituents found in primer mixtures. Since a functional primer requires an initiator, an oxidizer, and a fuel to work effectively, "All of the above" is the most accurate description of its composition. **High-Yield Clinical Pearls for NEET-PG:** * **GSR (Gunshot Residue):** The presence of **Lead, Barium, and Antimony** in a 1:1:1 ratio is the "gold standard" for identifying GSR via SEM-EDX (Scanning Electron Microscopy). * **Walker’s Test:** Used to detect nitrites in GSR. * **Harrison and Gilroy Test:** A chemical test used to detect the presence of Lead, Antimony, and Barium on the hands of a suspected shooter. * **Mercury Fulminate:** Historically used as a primer but largely replaced because it was corrosive to the gun barrel.

Question 85: A person was assaulted during a fight. Under which section of the Indian Penal Code (IPC) can they be arrested?

A. IPC 44
B. IPC 351 (Correct Answer)
C. IPC 319
D. IPC 320

Explanation: ### Explanation **Correct Answer: B. IPC 351** **Why IPC 351 is correct:** In the context of forensic medicine and legal terminology, **Assault (IPC 351)** is defined as any gesture or preparation made with the intention or knowledge that it will cause another person to apprehend that criminal force is about to be used against them. Crucially, assault does not require actual physical contact; the mere creation of a reasonable fear of violence in the victim's mind constitutes the offense. **Analysis of Incorrect Options:** * **IPC 44 (Injury):** This section defines "injury" as any harm whatever illegally caused to any person, in body, mind, reputation, or property. It is a broad definition rather than a specific punishable offense for an act of violence. * **IPC 319 (Hurt):** This defines "hurt" as causing bodily pain, disease, or infirmity to any person. Unlike assault, hurt requires actual physical contact or physiological impact. * **IPC 320 (Grievous Hurt):** This section lists eight specific types of severe injuries (e.g., permanent loss of sight/hearing, privation of any member/joint, fracture, or any hurt that endangers life or causes severe pain for 20 days). It is a more severe classification of IPC 319. **High-Yield Clinical Pearls for NEET-PG:** * **Assault vs. Battery:** In Indian law, "Assault" (IPC 351) is the threat, while "Criminal Force" (IPC 350) is the actual application of force (equivalent to Battery in English law). * **IPC 320 Criteria:** Remember the "20-day rule"—if a victim is unable to follow their ordinary pursuits for 20 days due to pain, it is classified as Grievous Hurt. * **IPC 44 Scope:** It is unique because it includes harm to **reputation and property**, not just physical injury.

Question 86: Contre-coup injuries are typically associated with which anatomical structure?

A. Brain (Correct Answer)
B. Diazepam
C. Flumazenil
D. Ethyl alcohol

Explanation: **Explanation:** **Contre-coup injuries** are a hallmark of head trauma, specifically involving the **brain**. The term refers to an injury occurring on the side of the organ opposite to the point of impact. This occurs when the moving head strikes a stationary object (e.g., a fall onto the back of the head). Due to inertia and the differential movement between the brain and the skull within the cerebrospinal fluid (CSF), the brain "sloshes" and impacts the internal bony prominences of the skull opposite the initial strike zone. This typically results in contusions and lacerations, most commonly involving the frontal and temporal lobes. **Analysis of Options:** * **A. Brain (Correct):** As described, the brain is the primary site for coup (at the site of impact) and contre-coup (opposite the site) injuries due to its mobility within the cranium. * **B, C, & D (Incorrect):** **Diazepam** (a benzodiazepine), **Flumazenil** (a benzodiazepine antagonist), and **Ethyl alcohol** are pharmacological substances. While they may contribute to the circumstances leading to a fall or head injury (due to sedation or intoxication), they are not anatomical structures capable of sustaining mechanical contre-coup injuries. **High-Yield NEET-PG Pearls:** * **Coup Injury:** Occurs when a moving object strikes a stationary head (e.g., being hit with a bat). * **Contre-coup Injury:** Occurs when the moving head strikes a stationary object (e.g., a fall). * **Common Sites:** The base of the frontal lobes and the tips of the temporal lobes are most susceptible to contre-coup contusions due to the irregular, rough surface of the anterior and middle cranial fossae. * **Mechanism:** It is primarily attributed to **cavitation** and **pressure gradients** created during sudden deceleration.

Question 87: What is the critical impact angle in external ricocheting?

A. 30 degrees (Correct Answer)
B. 45 degrees
C. 60 degrees
D. 90 degrees

Explanation: **Explanation:** **Ricochet** refers to the deflection of a projectile (bullet) after it strikes a hard surface instead of penetrating it. In forensic ballistics, the **critical impact angle** is defined as the maximum angle at which a bullet will deflect or "bounce" off a surface rather than penetrating it or disintegrating. 1. **Why 30 degrees is correct:** For most common surfaces (like wood, steel, or concrete) and standard handgun ammunition, the critical angle is generally accepted as **30 degrees**. If the angle of incidence is less than 30°, the bullet is highly likely to ricochet. If the angle exceeds this threshold, the bullet is more likely to penetrate the target or fragment upon impact. 2. **Why other options are incorrect:** * **45 and 60 degrees:** These angles are too steep. At these degrees of incidence, the perpendicular component of the bullet's velocity is usually sufficient to cause penetration into the substrate or lead to total deformation/fragmentation of the projectile. * **90 degrees:** This represents a perpendicular strike. At this angle, the bullet delivers its maximum kinetic energy directly into the target, resulting in either penetration or a direct "back-spatter" of fragments, but never a ricochet. **High-Yield Clinical Pearls for NEET-PG:** * **Ricochet Bullet Characteristics:** A ricocheted bullet often undergoes deformation (flattening on one side), loses stability (tumbles), and produces an **atypical/irregular entrance wound**. * **Trace Evidence:** A ricocheted bullet may carry "trace evidence" from the intermediate surface (e.g., paint, concrete dust, or wood fibers) into the wound. * **Angle of Departure:** The angle at which the bullet leaves the surface is usually smaller than the angle of impact. * **Critical Angle Variability:** While 30° is the standard textbook answer, the angle can vary based on the bullet's velocity, shape, and the hardness of the surface.

Question 88: Which of the following is NOT a characteristic of postmortem abrasions?

A. Exudation is more and scab is slightly raised (Correct Answer)
B. Yellowish, translucent, parchment-like color
C. Usually over bony prominences
D. No intra-vital reaction is seen

Explanation: ### Explanation The distinction between antemortem and postmortem injuries is a high-yield topic in Forensic Medicine. The correct answer is **Option A** because it describes the characteristics of an **antemortem** abrasion, not a postmortem one. **1. Why Option A is the Correct Answer (The "NOT" factor):** In **antemortem abrasions**, active circulation and vital reactions are present. This leads to the **exudation** of serum and blood, which dries to form a **raised, reddish-brown scab**. In contrast, postmortem abrasions occur after circulation has ceased; therefore, there is no exudation of fluid and no formation of a raised scab. **2. Analysis of Incorrect Options:** * **Option B (Yellowish, translucent, parchment-like):** This is a classic description of a postmortem abrasion. Since there is no blood flow, the area undergoes desiccation (drying out), causing the dermis to become thin, yellowish, and stiff like parchment. * **Option C (Usually over bony prominences):** Postmortem abrasions are often "artifacts" caused by rough handling of the body or dragging it over hard surfaces. These injuries naturally occur over bony prominences (like the sacrum, heels, or shoulders) where the skin is most vulnerable. * **Option D (No intra-vital reaction):** Intra-vital reactions (like inflammation, congestion, or enzyme changes) require a living physiological response. Their absence is the hallmark of a postmortem injury. **Clinical Pearls for NEET-PG:** * **Graze Abrasions:** Also known as "brush burns," these are the most common type and indicate the direction of force (skin tags are found at the distal end). * **Pressure Abrasions:** Also called "crush" abrasions (e.g., ligature marks in hanging). * **Vital Reaction:** The presence of a **red line of demarcation** or microscopic evidence of inflammation (neutrophilic infiltration) definitively identifies an injury as antemortem. * **Postmortem Mimicry:** Be careful not to confuse postmortem abrasions with "diaper rash" or ant-bite marks, which also lack vital reactions.

Question 89: Lightening flash can cause injury by all of the following mechanisms, except?

A. Direct effect of electric current
B. Superheated air
C. Expanded and repelled air
D. Compressed air pushed in front of the current (Correct Answer)

Explanation: **Explanation:** Lightning is a massive atmospheric discharge of static electricity. To understand the mechanisms of injury, one must distinguish between the physical properties of the electrical bolt and the surrounding atmospheric displacement. **Why Option D is Correct:** Lightning does not act like a physical projectile or a high-velocity firearm. It does not "push" a column of **compressed air** in front of it. Instead, the primary mechanical trauma (blast effect) associated with lightning is caused by the **rapid expansion** of air due to instantaneous heating, which creates a vacuum and a subsequent shockwave. **Analysis of Incorrect Options:** * **A. Direct effect of electric current:** This is the most common mechanism, causing cardiac arrhythmias (asystole), respiratory paralysis, and characteristic "Arborescent" or "Lichtenberg" skin markings. * **B. Superheated air:** The temperature of a lightning bolt can reach 30,000 K. This superheats the air in the immediate vicinity, causing flash burns and singeing of hair. * **C. Expanded and repelled air:** As the current passes, the air is heated so rapidly that it expands explosively. This creates a "blast effect" that can throw the victim several meters, causing blunt force trauma (fractures or intracranial hemorrhage). **High-Yield Clinical Pearls for NEET-PG:** * **Lichtenberg Figures (Filigree burns):** These are pathognomonic, transient, fern-like skin patterns caused by the extravasation of RBCs into the dermis. They are *not* true burns. * **Magnetization:** Steel objects (keys, watches) on the victim may become magnetized—a diagnostic sign in unwitnessed deaths. * **Cause of Death:** Immediate death is usually due to **cardiac arrest** (asystole) or medullary paralysis. * **Triage Rule:** In lightning mass casualties, use **"Reverse Triage"**—treat those who appear dead (respiratory arrest) first, as they have a high chance of recovery with ventilatory support.

Question 90: A form of torture in which the legs or thighs are tied with a bamboo clamp, and the torturer presses on the two sides of the clamp to cause pain, is called?

A. Falanga
B. Telefono
C. Mercelago
D. Chepuwa (Correct Answer)

Explanation: ### Explanation **Correct Answer: D. Chepuwa** **Chepuwa** is a specific method of physical torture historically documented in South Asia (particularly Nepal and parts of India). In this technique, the victim's limbs—most commonly the thighs or legs—are placed between two heavy bamboo poles or wooden clamps. The torturer then applies extreme pressure to the ends of the poles, creating a crushing force. This results in excruciating pain, severe soft tissue bruising, and potentially **crush syndrome** or compartment syndrome, often without leaving immediate external fractures. **Analysis of Incorrect Options:** * **A. Falanga (Bastinado):** This involves repeated beating of the **soles of the feet** with rods or whips. It is one of the most common forms of torture and leads to chronic pain and difficulty walking due to damage to the plantar aponeurosis and fat pads. * **B. Telefono:** This refers to delivering strong, simultaneous slaps with cupped hands over the **ears**. This causes a sudden increase in air pressure in the external auditory canal, often leading to tympanic membrane rupture and hearing loss. * **C. Mercelago (The Bat):** This involves suspending the victim by the ankles or knees (upside down) or by the arms tied behind the back. It leads to joint dislocations and severe orthostatic stress. **High-Yield Clinical Pearls for NEET-PG:** * **Dry Torture:** Techniques like Chepuwa and Telefono are often classified as "dry torture" because they aim to inflict maximum pain with minimal visible external scarring to evade forensic detection. * **Crush Syndrome:** In cases of Chepuwa, be alert for **myoglobinuria** and acute renal failure due to muscle necrosis. * **Forensic Significance:** Always look for "deep tissue bruising" or "subcutaneous hemorrhage" in the absence of skin lacerations in torture victims.

Practice by Chapter

Mechanical Injuries

Practice Questions

Transportation Injuries

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Fall from Height

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Blunt Force Trauma

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Sharp Force Trauma

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Ballistic Injuries

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Burn Injuries

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Drowning

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Electrocution

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Lightning Injuries

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Explosion Injuries

Practice Questions

Pattern Injuries and Their Recognition

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