Injuries and Their Significance Practice Questions

Q: Which of the following tissues is most resistant to electric current entry?

Bone. ***Bone*** - **Bone tissue** has a very high electrical resistance due to its low water content and dense, compact structure, making it a poor conductor of electricity. - This high resistance means that a significant amount of energy is required for electric current to pass through bone, making it the most resistant tissue listed. *Skin* - The **epidermis**, especially dry skin, offers significant resistance to electric current, acting as the primary barrier to entry. - However, once the skin is breached or wet, its resistance drops considerably, allowing current to pass more easily into deeper tissues. *Blood* - **Blood** is primarily composed of water and electrolytes, making it an excellent conductor of electricity. - Its low resistance allows electric current to flow through it with relative ease, contributing to systemic effects in electrical injuries. *Muscle* - **Muscle tissue** contains a high percentage of water and electrolytes, which makes it a good conductor of electricity. - Consequently, electric current can readily pass through muscle, leading to muscle spasms, contractions, and significant tissue damage.

Q: Telephonophobia refers to -

Beating on ears. ⚠️ **CRITICAL NOTE**: This question contains a terminology error. "Telephonophobia" in medical literature refers to **fear of telephones** (a specific phobia), NOT a physical symptom involving the ears. However, based on the context of this being a NEET-2013 question with "beating on ears" as the answer, this may be: 1. A mistranslation or historical term no longer in use 2. Confusion with another medical term 3. An error in the original examination **For exam purposes, the marked answer reflects the original question**, but students should note: ***Beating on ears*** (Marked as correct per original question) - This answer suggests the question may have intended to ask about a different term or concept - In modern medical terminology, this is **NOT** the definition of telephonophobia - **Telephonophobia** = irrational fear of making or receiving telephone calls (psychiatric condition) *Beating on soles* - This refers to **bastinado**, a form of corporal punishment - Not related to any phobia terminology *Beating on palms* - A form of corporal punishment - Not a recognized medical terminology for any phobia *Pulling of hair* - This describes **trichotillomania**, a body-focused repetitive behavior - Trichotillomania involves recurrent, irresistible urges to pull out hair from the scalp, eyebrows, or other areas **Recommendation**: This question should be reviewed for medical accuracy. The term "telephonophobia" as used here does not align with standard medical terminology.

Q: The main danger with low tension alternating current is

Cardiac arrest. ***Cardiac arrest*** - Low-tension alternating current (AC) is particularly dangerous because it can induce **ventricular fibrillation** at relatively low current levels. - The alternating nature allows for sustained muscle contraction and higher likelihood of interfering with the heart's electrical rhythm, leading to **cardiac arrest**. *Renal failure* - While severe electrical injuries can cause **rhabdomyolysis** and subsequent acute renal failure, this is typically associated with higher voltage and extensive tissue damage, not the primary danger of low-tension AC. - The immediate and most frequent life-threatening consequence of low-tension AC is its effect on the **heart rhythm**. *Myoglobinuria* - **Myoglobinuria** results from severe muscle damage (rhabdomyolysis), which can occur with electrical injury. - This is a consequence of significant tissue destruction, which is less common with low-tension AC compared to the risk of **cardiac arrhythmias**. *Burns* - **Burns** are a common consequence of electrical shock, especially with high-tension currents or prolonged contact. - While low-tension AC can cause burns, particularly at the contact points, the most immediate life-threatening risk is the disruption of **cardiac electrical activity**.

Q: If a fracture gives the pattern of the striking surface of the weapon it is called

Signature fracture. ***Signature fracture*** - A **signature fracture** is a term used when the bone fracture pattern directly reflects or reproduces the shape of the imparting object or weapon. - This type of fracture provides crucial forensic evidence, directly linking the injury to a specific weapon. *Pond fracture* - A **pond fracture** is a type of depressed skull fracture, typically seen in infants, where the bone is indented without complete disruption, resembling an indentation in a flexible surface. - It does not involve the replication of the weapon's striking surface but rather a localized depression. *Ring fracture* - A **ring fracture** (or foramen magnum fracture) is a fracture around the base of the skull, specifically encircling the foramen magnum. - These fractures are usually caused by an axial load impact (e.g., a fall on the head or feet) or hyperextension/hyperflexion injuries, not by replicating an object's surface. *Comminuted fracture* - A **comminuted fracture** is characterized by the bone breaking into several fragments, often three or more pieces, at the site of injury. - While it indicates high-energy trauma, it describes the number of bone fragments and not the pattern reflecting the striking object.

Q: You are conducting an autopsy on a patient and you find ladder tears near the main lesion on a major blood vessel. What is the most likely cause of the injury and subsequent death of the person?

Rapid deceleration. ***Rapid deceleration*** - **Ladder tears** (or transverse tears) of blood vessels, particularly the aorta, are highly characteristic of injuries sustained during **rapid deceleration** or impact. - These tears occur due to the sudden stretching and shearing forces on the vessel wall, often seen in high-speed motor vehicle accidents or falls from significant heights. *Penetrating injury* - **Penetrating injuries** typically result in a single, focused wound at the point of entry, such as a stab or gunshot wound. - They do not characteristically produce multiple, linear **ladder tears** along the length of a blood vessel unless there are multiple, distinct penetrating tracts. *Lightning strike* - **Lightning strikes** can cause a range of electrical injuries, including cardiac arrest, burns, and neurological damage. - While they can lead to vascular compromise, they do not typically manifest as distinct **ladder tears** in large vessels due to mechanical shearing forces. *Strangulation* - **Strangulation** involves external compression of the neck, leading to compromise of the carotid arteries and jugular veins, as well as airway obstruction. - The vascular injuries associated with strangulation are typically related to vessel occlusion or rupture in the neck, not **ladder tears** in major vessels elsewhere in the body.

Q: Feature of ruptured skin caused by excessive heat

Irregular margin. ***Irregular margin*** - Heat causes the skin to become **brittle and lose its elasticity**, resulting in a jagged or **irregular tear** when ruptured. - The **non-uniform stress** during heat-induced rupture prevents a clean, straight edge from forming. *Clear regular margin* - A clear regular margin is typically seen in **incised wounds** caused by sharp objects, which create a smooth cut. - This type of margin is not consistent with the tissue damage caused by **excessive heat**, which stiffens and embrittles the skin. *Contused margin* - A contused margin implies bruising and crushing of the tissue, usually seen in wounds caused by **blunt force trauma**. - While heat can cause underlying tissue damage, the immediate margin of a heat-ruptured skin tear is more about the **brittleness and tearing**, rather than contusion. *Abraded margin* - An abraded margin involves superficial scraping or rubbing away of the skin, characteristic of an **abrasion** wound. - This is distinct from a rupture where the skin tears through its full thickness due to **thermal damage**.

Q: In a blast injury, which of the following organs is least vulnerable to the blast wave?

Liver. ***Liver*** - Solid organs like the **liver** are relatively resilient to the direct effects of blast waves due to their **dense and homogeneous tissue structure**, which transmits pressure waves more efficiently without significant disruption. - While blunt trauma can injure the liver, it is less susceptible to barotrauma from a blast compared to air-filled or fluid-filled organs. *G.I. tract* - The **gastrointestinal tract**, particularly the stomach and intestines, is highly vulnerable to blast injuries due to the presence of **gas within its lumen**. - The rapid compression and re-expansion of gas in response to a blast wave can cause severe barotrauma, leading to hemorrhage, perforation, and mesenteric injury. *Lungs* - The **lungs** are extremely susceptible to blast injury due to their **air-filled nature**, which makes them prone to rapid pressure changes. - This can result in **pulmonary contusion**, hemorrhage, pneumothorax, and air embolisms, collectively known as blast lung. *Ear drum* - The **eardrum (tympanic membrane)** is one of the most commonly injured organs in a blast injury due to its thin, delicate structure and direct exposure. - The rapid pressure change from a blast wave easily causes **rupture of the tympanic membrane**, leading to hearing loss and pain.

Q: Type of injury in which depth of wound is more than the width is called as:

Stab. ***Stab*** - A **stab wound** is defined by its **depth being greater than its width**, as it is caused by a pointed object penetrating deeply into tissues. - These wounds can injure internal organs, and the external appearance may not fully reflect the **severity of the internal damage**. - This is the characteristic feature that matches the question - **depth exceeds width/length**. *Slash* - A **slash wound** is characterized by its length being significantly greater than its depth, often resulting from a **slicing motion** with a sharp object. - These wounds typically have **clean, sharply defined edges** and are superficial, primarily affecting the epidermis and dermis. *Laceration* - A **laceration** is an **irregularly shaped wound** caused by the tearing or crushing of soft tissues. - It usually has **jagged, uneven edges** and is often associated with blunt force trauma, differing from the clean edges of a slash wound. *Contusion* - A **contusion**, or bruise, is a type of injury where **blood vessels rupture beneath the skin** without a break in the skin surface. - It is characterized by **discoloration (ecchymosis)** and swelling, resulting from blunt force but not involving an open wound.

Q: Most common cause of death in electric AC current burns is

Cardiac arrest. ***Cardiac arrest*** - **Alternating current (AC)** is particularly lethal because it can induce **ventricular fibrillation** at relatively low voltages, directly disrupting the heart's electrical activity. - The constant muscle contraction and relaxation caused by AC current can lead to prolonged exposure to electricity and increased risk of **arrhythmias** and cardiac arrest. *Hemorrhagic stroke* - While electrical injuries can sometimes lead to cerebrovascular events, **hemorrhagic stroke** is not the most common immediate cause of death from AC burns. - Neurological complications are generally less immediate and frequent than direct cardiac effects in acute deaths from electric shock. *Septic shock* - **Septic shock** is a complication of severe burns, including electrical burns, but it typically occurs in the **later stages** as a result of infection. - It is not the most immediate or common cause of death following the initial electric shock. *Myoglobinuria leading to ARF* - **Myoglobinuria** and subsequent **acute renal failure (ARF)** can occur due to extensive muscle damage from electrical burns. - This is a significant complication of severe electrical injury but tends to develop in the **hours to days** following the injury, rather than being the most common immediate cause of death, which is typically cardiac.

Question 1

Which of the following tissues is most resistant to electric current entry?

Accepted Answer

Bone

Answer

Skin

Answer

Blood

Answer

Muscle

Question 2

Telephonophobia refers to -

Accepted Answer

Beating on ears

Answer

Beating on soles

Answer

Beating on palms

Answer

Pulling of hair

Question 3

70-year-old man who died suddenly has the finding shown here on external examination at autopsy. Which of the following is the most likely diagnosis?

Accepted Answer

Contact gunshot wound

Answer

Blunt force trauma from fall

Answer

Electrical injury

Answer

Sharp force injury

Question 4

The main danger with low tension alternating current is

Accepted Answer

Cardiac arrest

Answer

Renal failure

Answer

Myoglobinuria

Answer

Burns

Question 5

If a fracture gives the pattern of the striking surface of the weapon it is called

Accepted Answer

Signature fracture

Answer

Pond fracture

Answer

Ring fracture

Answer

Comminuted fracture

Question 6

You are conducting an autopsy on a patient and you find ladder tears near the main lesion on a major blood vessel. What is the most likely cause of the injury and subsequent death of the person?

Accepted Answer

Rapid deceleration

Answer

Penetrating injury

Answer

Lightning strike

Answer

Strangulation

Question 7

Feature of ruptured skin caused by excessive heat

Accepted Answer

Irregular margin

Answer

Clear regular margin

Answer

Contused margin

Answer

Abraded margin

Question 8

In a blast injury, which of the following organs is least vulnerable to the blast wave?

Accepted Answer

Liver

Answer

G.I. tract

Answer

Lungs

Answer

Ear drum

Question 9

Type of injury in which depth of wound is more than the width is called as:

Accepted Answer

Stab

Answer

Contusion

Answer

Slash

Answer

Laceration

Question 10

Most common cause of death in electric AC current burns is

Accepted Answer

Cardiac arrest

Answer

Hemorrhagic stroke

Answer

Septic shock

Answer

Myoglobinuria leading to ARF

Injuries and Their Significance — MCQs

Injuries and Their Significance — MCQs

On this page

Practice by Chapter

Want unlimited practice?