NEET-PG 2012 Practice Questions

Q: Which oil has the highest concentration of linolenic acid?

Soyabean oil. ***Soyabean oil*** - **Soyabean oil** contains approximately **7-10% linolenic acid (C18:3)**, an omega-3 fatty acid. - Among the given options, it has the **highest concentration** of this essential fatty acid. - **Linolenic acid** is crucial for **heart health** and **reducing inflammation**. *Coconut oil* - **Coconut oil** is primarily composed of **saturated fatty acids**, notably **lauric acid (C12:0)**. - It contains **negligible amounts** of **linolenic acid** (<0.5%). *Groundnut oil* - **Groundnut oil** (peanut oil) is rich in **oleic acid (C18:1)** and **linoleic acid (C18:2)**. - Its concentration of **linolenic acid** is very low (**~0.5-1%**), much lower than soyabean oil. *Safflower oil* - **Safflower oil** is known for its high content of **linoleic acid (C18:2)**, an omega-6 fatty acid. - It contains **minimal amounts** of **linolenic acid** (<1%).

Q: In the context of epidemiology, what is the denominator used for calculating incidence?

Population at risk. ***Population at risk*** - Incidence measures the **rate of new cases** of a disease in a population over a specified period. - The denominator for calculating incidence must exclude individuals who are **already diseased** or are **immune** and thus not susceptible to developing the condition. - This is the **most accurate and theoretically correct** denominator as it represents only those who can actually develop the disease. *Mid year population* - While often used as a **practical approximation** in epidemiological calculations when the exact population at risk is difficult to determine. - However, it includes individuals who may not be at risk (e.g., already have the disease or are immune), making it **less precise** than using the actual susceptible population. - For the **theoretical definition** of incidence rate, population at risk is the correct denominator. *Total number of cases* - This value represents the **numerator** for incidence calculations, as it counts the number of new events or diseases occurring. - It cannot serve as the denominator, as the denominator must reflect the pool of individuals from which these **new cases arose**. *Total number of deaths* - This is a measure of **mortality**, not incidence, and is used to calculate death rates. - The denominator for mortality rates is typically the **population at risk of death**, not specifically the population at risk of developing a disease.

Q: Which heavy metal is the most common cause of poisoning worldwide?

Arsenic. ***Arsenic*** - **Arsenic poisoning** is a significant global health concern, primarily due to contaminated groundwater used for drinking and agriculture, particularly in regions like Bangladesh, India, and parts of Southeast Asia. - Exposure can lead to a wide range of health effects, including **skin lesions**, nervous system disorders, and an increased risk of cancer, making it a major cause of morbidity and mortality worldwide. *Lead* - While **lead poisoning** is a serious public health issue, especially in children, its prevalence has significantly decreased in many developed countries due to the removal of lead from gasoline and paints. - Exposure is often occupational or from older residential sources, and though still a concern, it is not as widespread globally as arsenic contamination. *Mercury* - **Mercury poisoning** is often associated with industrial pollution, consumption of contaminated fish, and occupational exposure. - While severe and toxic, mercury exposure is generally more localized and less pervasive globally compared to arsenic in drinking water. *Cadmium* - **Cadmium poisoning** is primarily linked to industrial activities like battery manufacturing, mining, and through contaminated food sources. - It can cause kidney damage and bone disease but is generally considered less common as a global public health crisis compared to widespread arsenic contamination.

Q: What is the most likely diagnosis for a young patient presenting with iritis and joint pain?

AS. ***AS (Ankylosing Spondylitis)*** - **Iritis** (anterior uveitis) is a common extra-articular manifestation of **ankylosing spondylitis**, affecting up to 40% of patients [1]. - **Joint pain**, particularly in the axial skeleton (spine and sacroiliac joints), is a hallmark feature in young patients with AS [1]. *Gout* - Characterized by **recurrent attacks of acute inflammatory arthritis** due to **monosodium urate crystal deposition**. - While it causes severe joint pain, **iritis is not a typical manifestation** of gout. *RA (Rheumatoid Arthritis)* - RA is a **chronic autoimmune inflammatory disease** primarily affecting the **synovial joints** symmetrically, mostly in older adults. - While ocular manifestations like **scleritis** or **episcleritis** can occur, **iritis is less common** compared to AS. *Toxoplasma* - **Toxoplasmosis** primarily causes **chorioretinitis** (inflammation of the choroid and retina), not typically isolated iritis. - Although it can cause **arthralgia** (joint pain), it does not cause inflammatory arthritis like the spondyloarthropathies.

Q: A 45-year-old patient presents with progressive dyspnea, orthopnea, and bilateral pedal edema. On examination, there is elevated JVP, S3 gallop, and hepatomegaly. What is the most likely underlying pathophysiology?

HALE. ***HALE*** - This acronym stands for **Heart-failure Associated Lung Edema**. The symptoms of **progressive dyspnea**, **orthopnea**, **bilateral pedal edema**, **elevated JVP**, **S3 gallop**, and **hepatomegaly** are classic signs of **congestive heart failure** leading to fluid overload and pulmonary congestion [1]. - The pathophysiology involves the heart's inability to pump blood effectively, causing a buildup of pressure in the pulmonary and systemic circulations, leading to the observed symptoms [1]. *DALEY* - This is not a recognized acronym in medical pathophysiology. The symptoms presented are strongly indicative of a specific cardiovascular condition. - There is no clinical scenario where "DALEY" would accurately describe the underlying pathophysiology of dyspnea, edema, and heart failure signs. *OALY* - This is not a recognized acronym in medical pathophysiology. The presented clinical picture requires a well-established and specific pathophysiological explanation. - Using an unrecognized term would not provide an accurate or helpful description of the patient's condition. *None of the options* - The acronym HALE (Heart-failure Associated Lung Edema) accurately captures the core pathophysiology evident from the patient's symptoms and signs. - Given the strong clinical presentation of congestive heart failure with pulmonary and systemic congestion, one of the provided options *does* accurately describe the situation.

Q: Which of the following viruses is classified as a poxvirus?

Variola. ***Variola virus*** - **Variola virus** is the causative agent of **smallpox**, a historically significant and highly contagious disease. - It belongs to the **Orthopoxvirus** genus within the **Poxviridae family**, characterized by its large, brick-shaped virion and dsDNA genome. *Coxsackie virus* - **Coxsackieviruses** are part of the **Picornaviridae family**, specifically the **Enterovirus** genus. - They are known to cause a range of diseases including **hand-foot-and-mouth disease**, myocarditis, and aseptic meningitis, and are much smaller than poxviruses. *ECHO virus* - **Echoviruses** (Enteric Cytopathic Human Orphan viruses) are also members of the **Picornaviridae family** and the **Enterovirus** genus. - They are associated with diseases such as **aseptic meningitis**, gastroenteritis, and respiratory infections, completely distinct from poxviruses. *HSV (Herpes Simplex Virus)* - **Herpes Simplex Viruses** belong to the **Herpesviridae family**, characterized by a **linear dsDNA genome** and an enveloped icosahedral capsid. - They cause diseases like **oral and genital herpes** and are structurally and genetically distinct from poxviruses.

Q: Which virus is most commonly associated with disciform keratitis?

Herpes Simplex Virus (HSV). ***Herpes Simplex Virus (HSV)*** - **HSV** is the most common cause of **infectious disciform keratitis**, often following a primary ocular HSV infection or reactivation. - Disciform keratitis caused by HSV is a form of **immune-mediated stromal keratitis**, characterized by corneal edema, inflammation, and potential vision loss. *Rubella Virus* - While Rubella can cause ocular manifestations, such as **congenital cataracts** and **glaucoma** in infants, it is not typically associated with disciform keratitis in adults or children. - **Congenital rubella syndrome** is the primary context for ophthalmic issues related to this virus. *Human Immunodeficiency Virus (HIV)* - HIV can lead to various ocular complications, such as **CMV retinitis**, **Kaposi's sarcoma** of the conjunctiva, and **HIV retinopathy**. - However, HIV itself is **not directly linked** to disciform keratitis. *Hepatitis B Virus (HBV)* - HBV infection primarily affects the **liver** and is not commonly associated with direct ocular infections like keratitis. - Ocular manifestations are rare and often nonspecific, mainly related to systemic immune responses rather than direct viral replication in the eye.

Q: Herpetic keratitis is treated by which of the following?

Acyclovir. ***Acyclovir*** - **Acyclovir** is an **antiviral agent** that specifically targets the **herpes simplex virus**, which is the causative agent of herpetic keratitis. - It works by inhibiting viral DNA replication, thereby reducing viral load and preventing further damage to the cornea. *Analgesics* - **Analgesics** are used to manage pain but do not address the **viral etiology** of herpetic keratitis. - While they can improve patient comfort, they are not a definitive treatment for the underlying infection. *Atropine* - **Atropine** is a **cycloplegic agent** used to paralyze the ciliary muscle and dilate the pupil, often to reduce pain from ciliary spasms in uveitis. - It does not have **antiviral properties** and is not effective against the herpes virus. *Steroids* - **Corticosteroids** can suppress inflammation but are generally **contraindicated** in active herpetic keratitis, especially in the epithelial form. - They can worsen the viral infection by compromising the immune response, potentially leading to **corneal ulceration** and perforation.

Q: Neonatal conjunctivitis is caused by all of the following except:

Aspergillus. ***Aspergillus*** - **Fungal infections** of the eye, particularly by *Aspergillus*, are extremely rare in neonates and typically present as **keratitis** rather than conjunctivitis. - While *Aspergillus* can cause severe infections in immunocompromised individuals, it is not a common cause of neonatal conjunctivitis. *Gonococcus* - **_Neisseria gonorrhoeae_** is a well-known cause of **ophthalmia neonatorum** (gonococcal conjunctivitis), presenting as severe, purulent discharge usually within the first 2-5 days of life. - This infection can lead to **corneal ulceration** and blindness if untreated. *Chlamydia* - **_Chlamydia trachomatis_** is the most common bacterial cause of **neonatal conjunctivitis**, typically appearing 5-14 days after birth. - It causes a **mucopurulent discharge** and can be associated with **chlamydial pneumonia** in infants. *Pseudomonas* - **_Pseudomonas aeruginosa_** can cause severe and rapidly progressive **neonatal conjunctivitis** and **keratitis**, especially in premature infants or those exposed to contaminated solutions. - It is a highly aggressive pathogen that can lead to significant ocular morbidity.

Q: What is the recommended thickness of lead apron to prevent radiation exposure?

0.5 mm. ***0.5 mm*** - A **0.5 mm lead equivalent apron** is the universally accepted standard for protecting against primary beam radiation in most medical imaging procedures, including fluoroscopy and interventional radiology. - This thickness provides adequate **radiation attenuation** to significantly reduce dose to the wearer while maintaining reasonable comfort and mobility. *1 mm* - While offering increased attenuation, a **1 mm lead equivalent apron** is considerably heavier and less practical for routine use, leading to greater physical strain without a proportional increase in necessary protection for most procedures. - The additional weight and bulk can hinder movement and reduce compliance, especially during long procedures. *3 mm* - A **3 mm lead equivalent apron** would be excessively heavy and restrictive for medical personnel, making it highly impractical for general use in radiology departments. - The degree of protection offered by such an apron far exceeds the requirements for standard diagnostic and interventional procedures, incurring unnecessary physical burden. *7 mm* - A **7 mm lead equivalent apron** is an extreme thickness that would be entirely unfeasible for an individual to wear due to its immense weight and stiffness. - This level of shielding is typically found in fixed architectural barriers for radiation protection, such as walls of an X-ray room, not in personal protective equipment.

Question 1

Which oil has the highest concentration of linolenic acid?

Accepted Answer

Soyabean oil

Answer

Safflower oil

Answer

Coconut oil

Answer

Groundnut oil

Question 2

In the context of epidemiology, what is the denominator used for calculating incidence?

Accepted Answer

Population at risk

Answer

Mid year population

Answer

Total number of cases

Answer

Total number of deaths

Question 3

Which heavy metal is the most common cause of poisoning worldwide?

Accepted Answer

Arsenic

Answer

Mercury

Answer

Cadmium

Answer

Lead

Question 4

What is the most likely diagnosis for a young patient presenting with iritis and joint pain?

Accepted Answer

AS

Answer

Gout

Answer

RA

Answer

Toxoplasma

Question 5

A 45-year-old patient presents with progressive dyspnea, orthopnea, and bilateral pedal edema. On examination, there is elevated JVP, S3 gallop, and hepatomegaly. What is the most likely underlying pathophysiology?

Accepted Answer

HALE

Answer

DALEY

Answer

OALY

Answer

None of the options

Question 6

Which of the following viruses is classified as a poxvirus?

Accepted Answer

Variola

Answer

Coxsackie

Answer

ECHO

Answer

HSV

Question 7

Which virus is most commonly associated with disciform keratitis?

Accepted Answer

Herpes Simplex Virus (HSV)

Answer

Rubella Virus

Answer

Human Immunodeficiency Virus (HIV)

Answer

Hepatitis B Virus (HBV)

Question 8

Herpetic keratitis is treated by which of the following?

Accepted Answer

Acyclovir

Answer

Analgesics

Answer

Atropine

Answer

Steroids

Question 9

Neonatal conjunctivitis is caused by all of the following except:

Accepted Answer

Aspergillus

Answer

Chlamydia

Answer

Pseudomonas

Answer

Gonococcus

Question 10

What is the recommended thickness of lead apron to prevent radiation exposure?

Accepted Answer

0.5 mm

Answer

1 mm

Answer

3 mm

Answer

7 mm

NEET-PG 2012

Biochemistry

Community Medicine

Forensic Medicine

Internal Medicine

Microbiology

Ophthalmology

Radiology