NEET-PG 2012 Practice Questions

Q: Who made the statement 'The secret of national health lies in the homes of people'?

Bhore. ***Bhore (Bhore Committee Report, 1946)*** - This famous statement emphasizes the importance of **community-level health** and the role of individuals and families in maintaining national health. - The **Bhore Committee**, chaired by Sir Joseph Bhore in colonial India (1943-1946), was a landmark Health Survey and Development Committee that laid the foundation for India's health policy. - The committee highlighted the need for **primary healthcare at the grassroots level**, accessibility of health services, and the integration of preventive and curative services. - This philosophy remains foundational to India's public health approach and community medicine. *Indira Gandhi* - While a prominent Prime Minister of India who contributed significantly to national development programs and social welfare initiatives, this specific statement is not attributed to her. - Her health-related contributions included the **National Health Policy** discussions and family planning programs, but this quote predates her political leadership. *Abraham Lincoln* - As the 16th U.S. President (1861-1865), his leadership focused on the Civil War and abolition of slavery. - His famous speeches include the Gettysburg Address with "**government of the people, by the people, for the people**" but do not address national health in this specific manner. *Florence Nightingale* - A pioneer of modern nursing and founder of professional nursing education, she emphasized **sanitation**, hygiene, and patient care. - While she revolutionized hospital conditions and public health nursing, particularly during the Crimean War (1853-1856), this exact quote is not attributed to her. - Her focus was on **evidence-based nursing practice** and improving hospital sanitation standards.

Q: Secondary prevention is applicable to

Early stage of disease. ***Early stage of disease*** - **Secondary prevention** focuses on early detection and prompt treatment to halt the progression of an existing disease. - This stage is crucial for interventions like **screening tests** and **early diagnosis**, which aim to minimize the impact of the disease once it has begun. *Factors leading to disease* - This relates to **primary prevention**, which aims to prevent the disease from occurring in the first place by addressing risk factors or promoting health. - Examples include **vaccination** or promoting healthy lifestyle choices. *Advanced stage of disease* - This is the domain of **tertiary prevention**, which focuses on managing the disease, preventing complications, and improving quality of life once the disease is well-established. - Rehabilitation and long-term care are key aspects of this stage. *None of the options* - This option is incorrect because secondary prevention specifically targets the **early stage of disease** to prevent further progression and adverse outcomes.

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: 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: Colorado Tick fever is caused by:

Reoviridae. ***Reoviridae*** - Colorado Tick Fever (CTF) is caused by the **Colorado Tick Fever Virus (CTFV)**, which belongs to the genus **Coltivirus** within the family **Reoviridae**. - Reoviridae viruses are **non-enveloped**, double-stranded RNA viruses. *Filoviridae* - This family includes viruses like **Ebola virus** and **Marburg virus**, which cause severe hemorrhagic fevers. - They are **enveloped**, negative-sense single-stranded RNA viruses, distinct from the CTFV. *Coronaviridae* - This family includes viruses like **SARS-CoV-2 (COVID-19)** and SARS-CoV, which cause respiratory illnesses. - They are **enveloped**, positive-sense single-stranded RNA viruses, structurally different from CTFV. *Caliciviridae* - This family includes viruses like **Norovirus**, a common cause of acute gastroenteritis (viral stomach flu). - They are **non-enveloped**, positive-sense single-stranded RNA viruses and do not cause tick-borne illnesses.

Q: Which component is considered the central part of the complement pathway?

C3 (complement component 3). ***C3*** - **C3** is considered the central component because all three major pathways of complement activation (classical, alternative, and lectin) converge at the point of **C3 activation**. - Its cleavage product, **C3b**, is crucial for opsonization, formation of the C5 convertase, and initiating the assembly of the **membrane attack complex (MAC)**. *C1 (complement component 1)* - **C1** is the initial component of the **classical complement pathway** but does not play a direct role in the alternative or lectin pathways. - Its primary function is to bind to **antibody-antigen complexes** or directly to pathogens to activate C4 and C2. *C2 (complement component 2)* - **C2** is a component of the **classical** and **lectin pathways**, acting as a substrate for C1s and MASP to form the C3 convertase. - It is not involved in the initial activation of the **alternative pathway**. *C5 (complement component 5)* - **C5** is activated downstream of C3 and is a key component in the formation of the **membrane attack complex (MAC)**. - While critical for pathogen lysis, its activation is dependent on the prior cleavage of **C3** into C3b.

Q: Which of the following organisms does not enter through abrasions in the skin?

C hominis. ***Chryseobacterium hominis*** - **Chryseobacterium hominis** is primarily a cause of **nosocomial infections**, particularly in immunocompromised patients, and typically enters the body via **medical devices or respiratory route**, not skin abrasions. - It is known to colonize humid environments and medical equipment, leading to **bacteremia**, **meningitis**, or **pneumonia**. - This organism is transmitted through contaminated medical equipment, ventilators, or via the respiratory tract, distinguishing it from the other options. *Erysipelothrix rhusiopathiae* - This organism is a common cause of **erysipelas** or **erysipeloid** in humans, often contracted through contact with infected animals or animal products via **minor skin abrasions**. - The infection typically presents as a **painful, violaceous, spreading skin lesion** at the site of inoculation. - Common in fish handlers, butchers, and veterinarians who sustain occupational skin injuries. *Eikenella corrodens* - **Eikenella corrodens** is a gram-negative rod that is part of the normal oral flora and often causes infections following **human bites** or **fist fights** (clenched-fist injuries), where it enters through **skin abrasions or breaks**. - It is notorious for causing **osteomyelitis** and **abscesses** subsequent to these types of injuries. *Chromobacterium violaceum* - **Chromobacterium violaceum** is a rare but highly pathogenic bacterium found in soil and water in tropical and subtropical regions, entering the body through **breaks in the skin**, such as cuts or abrasions. - Infections are severe and can lead to **sepsis**, **multiple organ abscesses**, and a high mortality rate due to its production of **violacein** and other toxins.

Q: Which of the following substances is toxic to parasites?

Peroxidase. ***Peroxidase*** - **Peroxidase** enzymes, especially those produced by **eosinophils**, generate toxic oxygen metabolites and hypohalous acids that are highly effective at damaging and killing parasites. - This enzyme plays a crucial role in the host's defense against larger parasites, such as **helminths (worms)**. *Interferon-alpha* - **Interferon-alpha** is an important cytokine primarily known for its **antiviral effects** and its role in activating natural killer (NK) cells. - While it modulates immune responses, it does not directly act as a toxic substance to parasites. *IL-2 (Interleukin-2)* - **IL-2** is a growth factor that primarily promotes the **proliferation and differentiation of T cells**, enhancing adaptive immune responses. - It does not directly kill parasites but rather supports the immune cells involved in parasite clearance. *IL-6 (Interleukin-6)* - **IL-6** is a pleiotropic cytokine involved in **inflammation, acute phase responses**, and the differentiation of B cells and T cells. - While it contributes to overall immune regulation, it lacks direct parasiticidal activity.

Q: Toxoplasma in children causes:

Chorioretinitis. ***Chorioretinitis*** - **Toxoplasmosis** is a significant cause of **chorioretinitis** in children, particularly congenital infections. - Ocular toxoplasmosis often presents with **retinal lesions** that can lead to vision loss. *Conjunctivitis* - **Conjunctivitis** is an inflammation of the conjunctiva, typically caused by bacterial or viral infections. - While it can occur in children, it is not a primary or characteristic manifestation of **Toxoplasma infection**. *Keratitis* - **Keratitis** is an inflammation of the cornea, often caused by bacterial, viral, or fungal infections, or sometimes trauma. - Although eyes are affected by **Toxoplasma**, **keratitis** is not the typical ophthalmic presentation; **chorioretinitis** is. *Papillitis* - **Papillitis** refers to inflammation of the optic disc (optic nerve head). - While **Toxoplasma** can rarely affect the optic nerve, **papillitis** is not the most common or specific ocular manifestation compared to **chorioretinitis**.

Q: What is the mechanism of action of quinolones?

Inhibit DNA gyrase. ***Inhibit DNA gyrase*** - Quinolones, particularly **fluoroquinolones**, exert their bactericidal effect by targeting **bacterial DNA gyrase (topoisomerase II)** and **topoisomerase IV**. - This inhibition prevents the uncoiling and replication of bacterial DNA, leading to cell death. *Bind to 30S ribosomal subunit* - This mechanism is characteristic of **aminoglycosides** and **tetracyclines**, which disrupt bacterial protein synthesis. - Quinolones do not interfere with ribosomal function but rather with **DNA replication**. *Bind to bacterial cell membrane* - This is the mechanism of action for **polymyxins** and **daptomycin**, which disrupt the integrity of the bacterial cell membrane. - Quinolones specifically target **intracellular enzymes** involved in DNA handling. *Inhibit tetrahydrofolate reductase* - This enzyme name in the option is technically imprecise; **trimethoprim** actually inhibits **dihydrofolate reductase**, which is part of the **sulfonamide-trimethoprim (Bactrim)** combination. - This pathway is involved in **folic acid synthesis**, crucial for bacterial DNA and RNA production, a mechanism distinct from quinolones.

Question 1

Who made the statement 'The secret of national health lies in the homes of people'?

Accepted Answer

Bhore

Answer

Indira Gandhi

Answer

Florence Nightingale

Answer

Abraham Lincoln

Question 2

Secondary prevention is applicable to

Accepted Answer

Early stage of disease

Answer

Factors leading to disease

Answer

Advanced stage of disease

Answer

None of the options

Question 3

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 4

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 5

Colorado Tick fever is caused by:

Accepted Answer

Reoviridae

Answer

Coronaviridae

Answer

Filoviridae

Answer

Caliciviridae

Question 6

Which component is considered the central part of the complement pathway?

Accepted Answer

C3 (complement component 3)

Answer

C1 (complement component 1)

Answer

C2 (complement component 2)

Answer

C5 (complement component 5)

Question 7

Which of the following organisms does not enter through abrasions in the skin?

Accepted Answer

C hominis

Answer

E rhusiopathiae

Answer

E corrodens

Answer

C violaceum

Question 8

Which of the following substances is toxic to parasites?

Accepted Answer

Peroxidase

Answer

Interferon-alpha

Answer

IL-2 (Interleukin-2)

Answer

IL-6 (Interleukin-6)

Question 9

Toxoplasma in children causes:

Accepted Answer

Chorioretinitis

Answer

Keratitis

Answer

Papillitis

Answer

Conjunctivitis

Question 10

What is the mechanism of action of quinolones?

Accepted Answer

Inhibit DNA gyrase

Answer

Inhibit tetrahydrofolate reductase

Answer

Bind to 30S ribosomal subunit

Answer

Bind to bacterial cell membrane

NEET-PG 2012

Community Medicine

Internal Medicine

Microbiology

Ophthalmology

Pharmacology