NEET-PG 2012 Practice Questions

Q: What is the recommended daily calcium intake for adult non-pregnant females?

1000 mg. ***1000 mg*** - The recommended daily calcium intake for adult non-pregnant females (ages 19-50) is **1000 mg** according to **WHO and international guidelines** (US RDA/NIH) to maintain bone health and prevent osteoporosis. - This is the **standard recommendation** used in most medical textbooks and international nutritional guidelines. - Adequate calcium intake supports various bodily functions, including **nerve transmission**, **muscle contraction**, and **hormone secretion**. *1200 mg* - While 1200 mg is the recommended intake for **older women (above 50-70 years)** or during **pregnancy/lactation** per some guidelines, it is generally higher than necessary for non-pregnant adult females aged 19-50. - While not harmful, this higher dose is not specifically indicated for the general non-pregnant adult female population. *600 mg* - This amount of calcium is **lower than the internationally recommended daily allowance** for adult women (though it aligns with some regional guidelines like ICMR for sedentary women). - For optimal bone health and prevention of osteoporosis, **1000 mg is the widely accepted standard** in medical education. *800 mg* - This value is **below the internationally recommended daily intake** for adult non-pregnant females, which could lead to long-term calcium deficiency. - Insufficient calcium intake can increase the risk of conditions like **osteopenia** and **osteoporosis**.

Q: Which graphical representation is best suited for depicting continuous quantitative data?

Histogram. **Histogram** - A **histogram** is specifically designed for depicting the distribution of **continuous quantitative data** by dividing the data into bins and showing the frequency of data points within each bin. - The bars in a histogram are adjacent, indicating the continuous nature of the data and representing ranges of values. *Bar diagram* - A **bar diagram** (or bar chart) is typically used for comparing **discrete categories** or displaying changes over time for categorical data. - The bars in a bar diagram are usually separated, emphasizing distinct categories rather than continuous ranges. *Pie chart* - A **pie chart** is used to show the **proportions of a whole**, representing parts of a composition for categorical data. - It is not suitable for continuous data as it provides no information about the distribution or frequency across a range of values. *Pictogram* - A **pictogram** uses images or icons to represent data, making it visually engaging, but it is generally used for **simple comparisons of discrete or categorical data**. - It lacks the precision and detail required to accurately depict the distribution or frequency of continuous quantitative data.

Q: Which disease is associated with a propagative cycle?

Filaria. ***Filaria*** - The **filarial worm** undergoes a **biological transmission cycle** in the mosquito vector where microfilariae develop through larval stages (L1 → L2 → L3) with multiplication. - This represents a **cyclopropagative cycle** (both development and multiplication occur in the vector). - In the context of this question and classical teaching, filaria is considered the standard example of biological transmission with vector multiplication. - The infective L3 larvae multiply from a single microfilaria, and multiple larvae can develop within one mosquito. *Plague* - **Plague** (*Yersinia pestis*) is transmitted by fleas through **mechanical transmission**. - Bacteria multiply in the flea's gut causing blockage (blocking transmission), but this is not considered a true biological cycle. - The pathogen does not undergo developmental stages in the vector. *Malaria* - **Malaria** (*Plasmodium* spp.) undergoes the **sporogonic cycle** in the mosquito, which is also a **cyclopropagative cycle**. - Gametocytes → ookinete → oocyst → sporozoites (development with multiplication). - While biologically similar to filaria, in classical epidemiology teaching, filaria is more commonly cited as the example for propagative transmission. *None of the options* - This option is incorrect as filaria demonstrates biological transmission with multiplication in the vector. - Both filaria and malaria technically undergo cyclopropagative cycles, but filaria is the conventional answer in medical education contexts.

Q: School health checkup is primarily managed by which entity?

PHC. ***PHC (Primary Health Centre)*** - The **PHC is the primary entity responsible for managing school health checkups** in India as per the National Health Programs - The Medical Officer and health staff from the PHC conduct **periodic health examinations, immunizations, and screening programs** in schools within their jurisdiction - School health services are an integral component of the **MCH (Maternal and Child Health) services** provided by PHCs - The PHC maintains **health records of school children** and provides referral services for identified health problems *School health committee* - The School Health Committee plays a **coordinating and facilitating role** rather than primary management - It typically comprises school staff, parents, and local health representatives who help in **organizing logistics and follow-up** - While important for implementation, the committee does not conduct the actual medical examinations or manage the clinical aspects of health checkups *CHC* - The **Community Health Centre** serves as a referral center for PHCs and provides specialized services - Its role in school health is **secondary**, mainly providing referral services for cases requiring specialist consultation - CHCs do not directly conduct routine school health checkups *District hospital* - The **District Hospital** provides tertiary care and specialized medical services - Its involvement in school health is limited to **referral cases requiring advanced diagnostics or treatment** - It does not participate in routine primary management of school health checkup programs

Q: In which of the following diseases is mass vaccination considered ineffective?

Tetanus. ***Correct: Tetanus*** - Mass vaccination is considered **ineffective** for tetanus because it is **not a communicable disease** transmitted person-to-person - Tetanus is caused by **Clostridium tetani** spores present in soil and environment - Since there is **no herd immunity** benefit, vaccinating large populations simultaneously does not break any chain of transmission - **Individual immunization** with tetanus toxoid is highly effective for personal protection, but this is different from mass vaccination strategies used for communicable diseases - The focus for tetanus prevention is on **universal immunization** and **wound management**, not mass campaigns *Incorrect: Measles* - Mass vaccination for measles is **highly effective** due to its person-to-person transmission - Achieving high vaccination coverage (>95%) provides **herd immunity** and can lead to **elimination** - The **MMR vaccine** is a cornerstone of mass immunization programs worldwide *Incorrect: Polio* - Mass vaccination campaigns (Pulse Polio) have been **extremely effective** in nearly eradicating polio globally - The disease spreads through the fecal-oral route, making mass vaccination crucial for breaking transmission chains - Both **OPV** and **IPV** provide individual and community protection through herd immunity *Incorrect: None of the options* - This is incorrect because tetanus is a clear example where mass vaccination strategy is ineffective due to lack of person-to-person transmission

Q: What is the common adulterant found in black pepper?

Dried papaya seeds. ***Dried papaya seeds*** - **Dried papaya seeds** are a common adulterant in black pepper due to their similar size, shape, and color, making them difficult to distinguish visually. - Adulteration with papaya seeds is often done to increase the bulk and weight of the black pepper product, thereby reducing production costs. *Khesari dal* - **Khesari dal (Lathyrus sativus)** is a type of lentil known for causing **lathyrism**, a neurotoxic disorder, but it is not typically used to adulterate black pepper. - Its appearance and texture are distinctly different from black pepper, making it an unsuitable adulterant. *Fine sand* - **Fine sand** can be an adulterant in spices, but it is more commonly found in powdered spices like chilli powder or turmeric due to its fine particle size. - While it adds weight, its presence in whole black pepper would be easily detectable due to its abrasive texture and grittiness. *None of the options* - This option is incorrect because **dried papaya seeds** are a well-documented and common adulterant in black pepper. - The similarities in appearance make it a frequent choice for unscrupulous suppliers.

Q: Binding of gp120 causes:

Facilitation of co-receptor binding. ***Facilitation of co-receptor*** - **gp120** binding to the **CD4 receptor** on target cells induces a conformational change in gp120, which then exposes or creates a binding site for a **chemokine co-receptor** (CCR5 or CXCR4). - This interaction is crucial for the subsequent steps of viral entry, as it allows the virus to make further contact with the cell surface. *Infection of target cell* - While binding of gp120 is the *first step* in infection, it does not directly cause the infection itself. - Infection occurs after a series of events including co-receptor binding, membrane fusion, and reverse transcription. *Fusing of virus and target cell* - **Fusion** of the viral and cellular membranes is primarily mediated by **gp41**, which is part of the gp160 envelope glycoprotein complex alongside gp120. - This fusion event *follows* the binding of gp120 to CD4 and the co-receptor, as gp120 binding initiates the conformational changes that expose and activate gp41. *None of the options* - One of the provided options accurately describes a direct consequence of gp120 binding, making this option incorrect.

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 is the most common side effect of Cimetidine?

CNS effects (confusion, dizziness). ***CNS effects (confusion, dizziness)*** - **Cimetidine** is a **H2-receptor antagonist** that can cross the **blood-brain barrier**, leading to **central nervous system (CNS) side effects**. - These effects, including **confusion, dizziness**, and **headache**, are more common in elderly patients or those with renal impairment due to reduced drug clearance. *Impotence* - While **cimetidine** can cause **endocrine effects** due to its anti-androgenic activity, **impotence** is a less common side effect compared to CNS disturbances. - It results from the drug's interference with **testosterone metabolism** and binding to **androgen receptors**. *Gynaecomastia* - **Gynaecomastia** is a known **endocrine side effect** of **cimetidine** due to its **anti-androgenic activity** and promotion of **prolactin release**. - However, CNS side effects are generally encountered more frequently in clinical practice. *Diarrhea* - **Gastrointestinal side effects** like **diarrhea** are possible with various medications, but they are not the most common or characteristic side effect of **cimetidine**. - Nausea and constipation are also reported, but generally less frequently than CNS effects.

Q: Which of the following statements about dopamine is false?

Causes increase in GI Ischemia. ***Causes increase in GI Ischemia*** (FALSE Statement) - This statement is **incorrect and misleading** as dopamine does not primarily "cause increase in GI ischemia" - While dopamine at **higher doses** can cause **splanchnic vasoconstriction** via alpha-1 receptors, this is not characterized as "causing GI ischemia" in standard pharmacology - GI ischemia is a potential adverse effect in susceptible patients, but not a primary pharmacological effect or standard clinical description of dopamine *Positive inotropic* (TRUE Statement) - Dopamine is a **catecholamine** with dose-dependent effects; at **moderate doses (5-10 mcg/kg/min)**, it stimulates **beta-1 adrenergic receptors** in the heart - This beta-1 stimulation leads to increased **myocardial contractility** and **heart rate**, thus exerting a **positive inotropic effect** - This is a well-established therapeutic effect of dopamine *Improves renal perfusion* (TRUE Statement) - At **low doses (0.5-3 mcg/kg/min)**, dopamine selectively activates **dopamine-1 (D1) receptors** in the renal vasculature - This activation causes **renal vasodilation**, leading to increased **renal blood flow**, improved **glomerular filtration rate**, and enhanced **sodium excretion** - This "renal dose" effect is a classic pharmacological property of dopamine *Causes Vasoconstriction* (TRUE Statement) - At **high doses (>10 mcg/kg/min)**, dopamine primarily stimulates **alpha-1 adrenergic receptors** - This leads to generalized **vasoconstriction**, increasing **systemic vascular resistance** and **blood pressure** - This dose-dependent alpha effect is well-documented

Question 1

What is the recommended daily calcium intake for adult non-pregnant females?

Accepted Answer

1000 mg

Answer

1200 mg

Answer

600 mg

Answer

800 mg

Question 2

Which graphical representation is best suited for depicting continuous quantitative data?

Accepted Answer

Histogram

Answer

Bar diagram

Answer

Pie chart

Answer

Pictogram

Question 3

Which disease is associated with a propagative cycle?

Accepted Answer

Filaria

Answer

None of the options

Answer

Plague

Answer

Malaria

Question 4

School health checkup is primarily managed by which entity?

Accepted Answer

PHC

Answer

CHC

Answer

District hospital

Answer

School health committee

Question 5

In which of the following diseases is mass vaccination considered ineffective?

Accepted Answer

Tetanus

Answer

None of the options

Answer

Measles

Answer

Polio

Question 6

What is the common adulterant found in black pepper?

Accepted Answer

Dried papaya seeds

Answer

Khesari dal

Answer

Fine sand

Answer

None of the options

Question 7

Binding of gp120 causes:

Accepted Answer

Facilitation of co-receptor binding

Answer

Infection of target cell

Answer

Fusing of virus and target cell

Answer

None of the options

Question 8

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 9

Which of the following is the most common side effect of Cimetidine?

Accepted Answer

CNS effects (confusion, dizziness)

Answer

Diarrhea

Answer

Impotence

Answer

Gynaecomastia

Question 10

Which of the following statements about dopamine is false?

Accepted Answer

Causes increase in GI Ischemia

Answer

Improves renal perfusion

Answer

Causes Vasoconstriction

Answer

Positive ionotropic

NEET-PG 2012

Biochemistry

Community Medicine

Microbiology

Pharmacology