NEET-PG 2015 Practice Questions

Q: Lens is attached to ciliary body via?

Zonular fibers. ***Zonular fibers*** - The **suspensory ligaments** of the lens, known as zonular fibers (or **Zonules of Zinn**), connect the lens capsule to the ciliary body. - These fibers play a crucial role in **accommodation** by transmitting the tension from the ciliary muscle to the lens, causing it to change shape [2]. *Limbus* - The **limbus** is the junction between the cornea and the sclera, serving as a transitional zone [3]. - It does not directly attach the lens to the ciliary body but is an important anatomical landmark for eye surgery. *Vitreous Humour* - The **vitreous humor** is the clear, gel-like substance that fills the space between the lens and the retina [4]. - It maintains the shape of the eye and holds the retina in place, but it does not provide structural attachment for the lens. *Root of iris* - The **root of the iris** is the outermost part of the iris where it attaches to the ciliary body. - While it is adjacent to the ciliary body, it is the iris structure itself and does not serve to attach the lens [1].

Q: Vanaspati Ghee is fortified with ?

Vitamin A. ***Vitamin A*** - **Vanaspati Ghee** is commonly fortified with **Vitamin A** to improve its nutritional value and address deficiencies. - Fortification helps to combat **Vitamin A deficiency disorders**, such as **night blindness**. *Iodine* - **Iodine** is typically used to fortify **table salt** to prevent **goiter** and **iodine deficiency disorders**. - It is not commonly added to Vanaspati Ghee. *Iron* - **Iron** is commonly used to fortify foods like **flour** and **cereals** to combat **anemia**. - Vanaspati Ghee is not a common vehicle for iron fortification. *Calcium* - **Calcium** is often added to dairy products or certain beverages to support **bone health**. - It is not a standard fortification for Vanaspati Ghee.

Q: Waste Sharps should be disposed in ?

Yellow bag. ***Yellow bag (Historical answer per BMW Rules 1998)*** - Under the **Biomedical Waste Management Rules 1998** (applicable at the time of NEET-PG 2015), **sharps waste** including needles, syringes, and scalpels were disposed in **yellow puncture-proof containers**. - This was the correct answer when this question was asked in the 2015 examination. - **Current Guidelines (BMW Rules 2016):** Sharps are now disposed in **white/translucent puncture-proof containers**, NOT yellow bags. Yellow bags are currently used for soiled infectious waste like dressings and body fluid-contaminated materials. *Black bag* - **Black bags** are used for **general non-hazardous waste** that poses no biological risk. - Disposing of sharps in black bags creates serious **risk of needlestick injuries** and potential transmission of bloodborne pathogens. *None of the options* - This is incorrect because there is a specific, regulated method for disposing of sharps in healthcare settings. - Proper waste segregation is **mandatory** for safety and regulatory compliance. *Blue bag* - **Blue bags** (per BMW Rules 2016) are used for disposal of **glassware** (broken or discarded) and **metallic body implants**. - Under older guidelines, blue bags were for certain pharmaceutical waste. - They are not designated for sharps disposal.

Q: Which of the following is an example of a case-control study?

PVC exposure and angiosarcoma of the liver. ***PVC exposure and angiosarcoma of the liver*** - This is a classic example of a **case-control study** where individuals with a rare disease (angiosarcoma of the liver) are identified (cases) and compared to a control group without the disease to determine past exposures (PVC). - The study looked back in time to identify differences in exposure between cases and controls. *Framingham heart study (cohort study)* - The Framingham Heart Study is a well-known **prospective cohort study** that has followed participants over time to observe the development of cardiovascular disease. - In a cohort study, researchers identify a group of individuals and follow them forward in time to see who develops the outcome of interest, making it different from a case-control design. *Doll & Hill Study (cohort study)* - The Doll & Hill study is a landmark **cohort study** that investigated the association between smoking and lung cancer by following a group of British doctors over several years. - This study started with healthy individuals and observed them over time to see who developed lung cancer, which is characteristic of a cohort design. *Thalidomide exposure and its association with teratogenicity* - While the thalidomide tragedy led to crucial epidemiological investigations, the initial identification of the association was often through **case series** or **descriptive epidemiology**, noting an unusual clustering of rare birth defects among infants whose mothers took thalidomide. - Subsequent studies might have incorporated case-control elements, but the prompt asks for an example of a case-control study, and this event itself is generally cited for its role in pharmacovigilance and observational studies rather than a single, classic case-control study example in the way "PVC and angiosarcoma" is.

Q: Which of the following conditions is characterized by the presence of blisters?

Burns. ***Burns*** - Blisters, or **vesicles/bullae**, are a hallmark of **partial-thickness (second-degree) burns**, where damage extends into the dermis. - They form as **serous fluid** accumulates between the epidermis and the damaged dermal layers. - These are **antemortem (vital) blisters** that develop in living tissue as a response to thermal injury. *Putrefaction* - This is the **decomposition of organic matter** by microorganisms, characterized by **odor, discoloration, and gas formation**. - While **putrefactive blisters** can form postmortem due to gas accumulation and skin separation, these are **postmortem artifacts**, not vital reactions. - The key distinction: putrefactive blisters lack the **inflammatory response** and **vital reaction** seen in antemortem burn blisters. - In the context of injuries and their clinical significance, burns are the primary condition characterized by blister formation. *Arsenic Poisoning* - While chronic arsenic exposure can cause **hyperpigmentation** and **hyperkeratosis**, acute poisoning primarily involves **gastrointestinal symptoms**, cardiovascular collapse, and neurological effects. - Blister formation is not a characteristic or common dermatological manifestation of arsenic poisoning. *Postmortem caloricity* - This refers to the **temporary rise in body temperature** after death, typically seen in cases of **sepsis** or certain drug intoxications. - It is a **thermal phenomenon** and does not involve the formation of blisters on the skin.

Q: How can homicidal gunshot wounds be differentiated from suicidal gunshot wounds?

Presence of signs of struggle. ***Correct Option: Presence of signs of struggle*** - **Signs of struggle** (defensive wounds, abrasions, bruising, torn clothing, disturbed surroundings) are the **most reliable indicator of homicidal gunshot wounds** - **Forensic significance**: Defense wounds on hands/forearms, struggle marks, and signs of restraint strongly suggest the victim resisted an attacker - **Absent in suicide**: Suicidal acts occur without external confrontation, so defensive injuries and struggle signs are typically absent - This is the **primary forensic differentiator** between homicide and suicide in gunshot cases *Incorrect: Presence of multiple gunshot wounds* - While **more common in homicide**, multiple gunshot wounds **CAN occur in suicide** (documented as "hesitation wounds" or multiple attempts with non-fatal first shots) - **Not a reliable sole differentiator**: Cases of suicidal individuals firing multiple shots are well-documented in forensic literature, especially with small caliber weapons or when vital organs are missed - Other factors (wound location, distance, angle) are needed for complete assessment *Incorrect: Presence of gunpowder on hands* - **Gunshot residue (GSR) on victim's hands** actually **indicates suicide** rather than homicide, as it suggests the victim held and fired the weapon - In **homicide**, GSR is typically **absent** from the victim's hands (unless they struggled for the weapon) - This differentiates suicide FROM homicide, but the question asks how to identify homicide *Incorrect: None of the above* - This is incorrect because **specific forensic indicators exist** to differentiate homicidal from suicidal gunshot wounds - Signs of struggle provide the most reliable differentiation

Q: In the context of chest pain evaluation, which is the best way to differentiate between stable angina and NSTEMI?

Cardiac-biomarker. **Cardiac-biomarker** - **Cardiac biomarkers**, particularly **troponin**, are crucial for differentiating between **unstable angina** and **NSTEMI** [1], [2]. In NSTEMI, there is evidence of **myocardial necrosis**, leading to elevated cardiac troponins [2]. - **Stable angina** and **unstable angina** do not involve myocardial necrosis, so troponin levels remain within the normal range [1]. *ECG* - While an **ECG** is essential in the initial assessment of chest pain, it may show **non-specific changes** in both **unstable angina** and **NSTEMI**, such as T-wave inversions or ST-segment depression [2]. - The definitive distinction of **NSTEMI** often relies on **sequential biomarker measurements**, as ECG changes alone may not be sufficient for diagnosis or differentiation from unstable angina [2]. *Trans thoracic Echocardiography* - **Echocardiography** can show **regional wall motion abnormalities** that might suggest ischemia, but these findings are not specific enough to differentiate between **stable angina** and **NSTEMI** immediately. - It is more useful for assessing **ventricular function**, identifying **valvular disease**, or detecting other causes of chest pain, rather than acute differentiation of coronary syndromes. *Multi uptake gated Acquisition scan* - A **MUGA scan** assesses **left ventricular ejection fraction** and wall motion, primarily used in evaluating global cardiac function and monitoring cardiotoxicity from chemotherapy. - It is **not a first-line diagnostic tool** for differentiating between acute coronary syndromes like **stable angina** and **NSTEMI** because it does not directly detect acute myocardial injury.

Q: Macular sparing is associated with lesions in:

Lesions in the occipital cortex. ***Lesions in the occipital cortex*** - **Macular sparing** occurs when the central visual field (macula) is preserved despite damage to the occipital cortex, often due to its dual blood supply from the **middle cerebral artery** and the **posterior cerebral artery**. [2] - This phenomenon typically results from a **vascular lesion** in the occipital lobe, leading to a **homonymous hemianopia** with a distinct sparing of the foveal region. [2], [3] *Lesions in the optic nerve* - Lesions in the optic nerve cause **monocular vision loss** or central scotomas, rather than the homonymous visual field defects associated with macular sparing. [2] - Damage here affects the visual pathway **before** the optic chiasm, impacting the entire visual input from one eye. [2] *Lesions in the lateral geniculate body* - Lesions in the **lateral geniculate body (LGB)** produce **contralateral homonymous hemianopia** or quadrantanopia, but typically **do not exhibit macular sparing** as consistently as cortical lesions. - The LGB processes visual information from both eyes before relaying it to the visual cortex. [1] *Lesions in the optic chiasma* - Lesions in the **optic chiasma** classically cause **bitemporal hemianopia**, affecting the temporal visual fields of both eyes. [2] - This type of visual field defect is distinct from the homonymous defects seen with macular sparing, as it results from damage to the **crossing nasal fibers**. [2]

Q: All of the following are true for sympathetic ophthalmitis except which of the following?

Affects the injured eye. ***Affects the injured eye*** - Sympathetic ophthalmia is a **bilateral, granulomatous panuveitis** that characteristically affects the **fellow, uninjured eye** (sympathizing eye) following trauma or surgery to the other eye (exciting eye). - The disease involves an immune response directed against ocular antigens, typically from the uveal tissue, in the uninjured eye. *Mostly results from a penetrating wound* - This statement is true; **penetrating ocular trauma** (e.g., from surgery or injury) is the most common trigger for sympathetic ophthalmia. - The exposure of uveal antigens from the injured eye initiates an autoimmune response. *Autoimmune etiology* - This statement is true; sympathetic ophthalmia is an **autoimmune disease** mediated by T-lymphocytes against uveal antigens. - The condition is characterized by a delayed hypersensitivity reaction against exposed uveal proteins. *Dalen Fuch's nodules may be seen* - This statement is true; **Dalen-Fuchs nodules** are characteristic histopathological findings in sympathetic ophthalmia. - These are accumulations of epithelioid cells and lymphocytes located between the retinal pigment epithelium and Bruch's membrane.

Q: Which optical instrument utilizes the principle of total internal reflection?

Gonioscope. ***Gonioscope*** - A **gonioscope** uses mirrors or prisms to allow visualization of the **anterior chamber angle**, leveraging **total internal reflection** to bypass the normal optical limitations of the cornea. - The principle of total internal reflection occurs when light traveling from a denser medium (like the prism/mirror in the gonioscope) hits an interface with a less dense medium (like air or the aqueous humor) at an angle greater than the **critical angle**, causing all light to reflect back. *Pachymeter* - A **pachymeter** is used to measure the **thickness of the cornea**, typically employing ultrasound or optical methods. - It does not rely on total internal reflection but rather on the time-of-flight of sound waves or the reflection/scattering of light from corneal layers. *Ophthalmoscope* - An **ophthalmoscope** is used to examine the posterior segment of the eye, including the **fundus**, optic disc, and retina. - It works by directing a light source into the eye and viewing the reflected light, using lenses to focus the image, without utilizing total internal reflection. *Lensometer* - A **lensometer** (or focimeter) is an optician's instrument used to measure the prescription of eyeglasses or contact lenses, including **sphere, cylinder, and axis**. - Its operation is based on standard lens optics and does not involve the principle of total internal reflection.

Question 1

Lens is attached to ciliary body via?

Accepted Answer

Zonular fibers

Answer

Limbus

Answer

Vitreous Humour

Answer

Root of iris

Question 2

Vanaspati Ghee is fortified with ?

Accepted Answer

Vitamin A

Answer

Iodine

Answer

Iron

Answer

Calcium

Question 3

Waste Sharps should be disposed in ?

Accepted Answer

Yellow bag

Answer

Black bag

Answer

None of the options

Answer

Blue bag

Question 4

Which of the following is an example of a case-control study?

Accepted Answer

PVC exposure and angiosarcoma of the liver

Answer

Framingham heart study

Answer

Doll & Hill Study

Answer

Thalidomide exposure and its association with teratogenicity

Question 5

Which of the following conditions is characterized by the presence of blisters?

Accepted Answer

Burns

Answer

Arsenic Poisoning

Answer

Postmortem caloricity

Answer

Putrefaction

Question 6

How can homicidal gunshot wounds be differentiated from suicidal gunshot wounds?

Accepted Answer

Presence of signs of struggle

Answer

Presence of multiple gunshot wounds

Answer

Presence of gunpowder on hands

Answer

None of the above

Question 7

In the context of chest pain evaluation, which is the best way to differentiate between stable angina and NSTEMI?

Accepted Answer

Cardiac-biomarker

Answer

ECG

Answer

Trans thoracic Echocardiography

Answer

Multi uptake gated Acquisition scan

Question 8

Macular sparing is associated with lesions in:

Accepted Answer

Lesions in the occipital cortex

Answer

Lesions in the optic nerve

Answer

Lesions in the lateral geniculate body

Answer

Lesions in the optic chiasma

Question 9

All of the following are true for sympathetic ophthalmitis except which of the following?

Accepted Answer

Affects the injured eye

Answer

Mostly results from a penetrating wound

Answer

Autoimmune etiology

Answer

Dalen-Fuchs nodules may be seen

Question 10

Which optical instrument utilizes the principle of total internal reflection?

Accepted Answer

Gonioscope

Answer

Pachymeter

Answer

Ophthalmoscope

Answer

Lensometer

NEET-PG 2015

Anatomy

Community Medicine

Forensic Medicine

Internal Medicine

Ophthalmology