NEET-PG 2015 Practice Questions

Q: Which anatomical structure lies between the bulla ethmoidalis and the uncinate process of the ethmoid?

Ethmoidal infundibulum. ***Ethmoidal infundibulum*** - The **ethmoidal infundibulum** is a curved, three-dimensional space located within the **lateral wall of the nasal cavity**. - It forms a critical drainage pathway, often leading to the opening of the **maxillary sinus** and serving as the primary outflow tract for the anterior ethmoidal air cells. *Bulla ethmoidalis* - The **bulla ethmoidalis** is the largest and most constant anterior ethmoid air cell, bulging into the middle meatus. - It lies *superior and posterior* to the ethmoidal infundibulum, forming one of its boundaries, not the space itself. *Uncinate process of ethmoid* - The **uncinate process** is a sickle-shaped bony lamella that forms the *anterior and inferior boundary* of the ethmoidal infundibulum. - It helps define the pathway for drainage but is a bony structure, not the intervening space. *Maxillary sinus* - The **maxillary sinus** is a paranasal sinus located within the maxilla, which drains into the posterior part of the ethmoidal infundibulum or hiatus semilunaris. - It is a separate air-filled cavity, not the anatomical space between the bulla ethmoidalis and uncinate process.

Q: What is the type of epithelium of the adenoid?

Pseudostratified ciliated columnar epithelium. ***Pseudostratified ciliated columnar epithelium*** - The adenoid (pharyngeal tonsil) is located in the nasopharynx, which is part of the upper respiratory tract and is lined with **pseudostratified ciliated columnar epithelium** with goblet cells [1]. - This type of epithelium is also known as **respiratory epithelium**, and its cilia and mucus-producing goblet cells help to trap and clear inhaled particles and pathogens [1]. *Non-keratinized squamous epithelium* - This type of epithelium is found in areas subject to friction and abrasion, such as the oral cavity, oro- and laryngopharynx, and esophagus, not typically in the nasopharynx. - It provides protection but lacks the ciliated and mucus-producing cells necessary for clearing respiratory passages. *Cuboidal epithelium* - This epithelium is typically found in glands and ducts, secretory and absorptive surfaces, such as renal tubules and thyroid follicles. - It does not have the specialized functions (cilia, mucus production) required for the respiratory system's protective lining. *Columnar epithelium with goblet cells* - While the adenoid epithelium does contain **goblet cells** for mucus production, specifically stating "columnar epithelium" is not as precise as "pseudostratified ciliated columnar epithelium." - The key feature of being **pseudostratified** and **ciliated** is crucial for its function in the nasopharynx [1].

Q: In a community of 1,000,000 population, 105 children were born in a year, out of which 5 were stillbirths and 4 died within the first year of life. What is the Infant Mortality Rate (IMR)?

40. ***40*** - **Infant Mortality Rate (IMR)** = (Deaths in first year of life / Live births) × 1,000 - Live births = Total births - Stillbirths = 105 - 5 = **100** - IMR = (4 / 100) × 1,000 = **40 per 1,000 live births** - Stillbirths are excluded from both numerator and denominator as IMR only counts deaths after live birth *90* - This would result from incorrectly using total births (105) instead of live births (100) in the denominator - Wrong calculation: (4 / 105) × 1,000 ≈ 38, not 90 - This option represents a common error but with incorrect arithmetic *120* - This could result from including stillbirths in the numerator: (5+4) / 100 × 1,000 = 90, not 120 - Or from other miscalculations mixing up the numerator and denominator - Does not follow the standard IMR formula *150* - This represents a significant calculation error - May result from using wrong base (per 100 instead of per 1,000) or including stillbirths incorrectly - Such high IMR does not match the given data of 4 infant deaths per 100 live births

Q: Bladder cancer can occur in those who are working in dye industry for 25 years. Which study design is most appropriate for establishing a causal relationship between dye industry work and bladder cancer?

Cohort study. ***Cohort study*** - A **cohort study** tracks a group of individuals exposed to a risk factor (dye industry work) and a group not exposed over time to see who develops the outcome (bladder cancer). - This design allows for the calculation of **incidence rates** and relative risk, which are crucial for establishing a causal link, especially when the exposure is rare or specific. - Cohort studies establish **temporal relationship** (exposure precedes disease) and can demonstrate a **dose-response relationship**, both essential for proving causality. *Cross-sectional study* - A **cross-sectional study** assesses exposure and outcome simultaneously at a single point in time, making it difficult to determine the temporal sequence of events. - While it can identify associations, it cannot definitively establish a **cause-and-effect relationship** because it doesn't observe outcomes developing over time. *Case-control study* - A **case-control study** compares individuals with the outcome (cases) to individuals without the outcome (controls) and retrospectively looks for differences in past exposures. - While useful for studying **rare diseases** and can suggest associations, it is prone to **recall bias** regarding exposure history and cannot establish causality as definitively as cohort studies. *Randomized control trial* - A **randomized controlled trial (RCT)** involves randomly assigning participants to an intervention group or a control group and following them prospectively. - While RCTs provide the strongest evidence for causality, it would be **unethical** to intentionally expose people to a known carcinogen like dye industry chemicals for research purposes.

Q: The absorption elution technique is used for?

Detection of blood groups. ***Detection of blood groups*** - The **absorption-elution technique** is a sensitive method used to detect **ABO blood group antigens** in dried bloodstains, a common application in forensic serology. - It involves absorbing antibodies specific to blood group antigens onto the dried stain and then eluting these absorbed antibodies to react with known red blood cells. *Examination of seminal stains* - **Seminal stains** are typically examined for the presence of **spermatozoa** or markers like **prostate-specific antigen (PSA)** or **acid phosphatase**. - The absorption-elution technique is not the primary method for identifying seminal fluid or its origin. *Detection of species* - **Species identification** in forensic samples usually involves techniques such as **DNA analysis** (e.g., mitochondrial DNA sequencing) or **precipitin tests**. - The absorption-elution method is specific to blood group antigens and not generally used for broad species differentiation. *None of the options* - This option is incorrect because the **absorption-elution technique** is indeed directly applicable and commonly used for the **detection of blood groups**.

Q: Which type of DNase produced by Streptococcus is known to be the most antigenic in humans?

DNase B. ***DNase B*** - **DNase B** is the most **antigenic** of the four DNases (A, B, C, D) produced by *Streptococcus pyogenes*. - Antibodies against DNase B are commonly measured as anti-DNase B titers in the diagnosis of **streptococcal infections** and their sequelae, like **acute rheumatic fever** and **post-streptococcal glomerulonephritis**, especially when ASO titers are negative. *DNase A* - While *Streptococcus pyogenes* produces **DNase A**, it is not considered the most antigenically potent or clinically relevant for antibody testing in humans. - Its antigenicity is generally **lower** than that of DNase B in response to streptococcal infection. *DNase C* - **DNase C** is another deoxyribonuclease produced by *Streptococcus pyogenes*. - Similar to DNase A, it does not elicit as strong or as consistent an **antibody response** in human infections compared to DNase B. *DNase D* - **DNase D** is the fourth type of deoxyribonuclease produced by *Streptococcus pyogenes*. - Its **antigenicity** in humans is less pronounced and less diagnostically significant than that of **DNase B**.

Q: In the context of diagnosing syphilis, which of the following is an example of a precipitation test?

Kahn test. ***Kahn test*** - The Kahn test is a **flocculation** or **precipitation** test used for diagnosing syphilis. - It detects **reagin antibodies** in the patient's serum that react with a non-treponemal antigen (cardiolipin antigen). *Rose waaler test* - The Rose Waaler test is an **agglutination test** used to detect **rheumatoid factor** in patients with rheumatoid arthritis, not syphilis. - It involves sheep red blood cells sensitized with rabbit anti-sheep erythrocyte antibody. *Widal test* - The Widal test is an **agglutination test** used for the diagnosis of **typhoid fever**, detecting antibodies against *Salmonella* O and H antigens. - It is not used for the diagnosis of syphilis. *Latex agglutination* - Latex agglutination is a general type of **agglutination test** where antigen or antibody is coated onto latex particles. - While used in various diagnoses, it is not a specific precipitation test for syphilis in the context of classic methods like the Kahn test.

Q: ABO non- secretors are more prone to ?

Increased risk of infections. Increased risk of infections - Non-secretors of ABO antigens exhibit an increased susceptibility to a variety of infections, particularly bacterial and viral pathogens. - This is thought to be due to the absence of ABO antigens in secretions, which typically act as decoy receptors to prevent pathogen adhesion to host cells. Autoimmune diseases - While some associations between ABO blood groups and autoimmune diseases exist, non-secretor status is not consistently linked to a higher overall risk of autoimmune conditions. Cardiovascular diseases - ABO blood groups have been associated with cardiovascular risk, with non-O blood types generally having a slightly higher risk of certain cardiovascular events. - However, secretor status (the ability to secrete ABO antigens into bodily fluids) itself is not a prominent independent risk factor for cardiovascular diseases. Cancer - There are some documented associations between specific ABO blood types and certain types of cancer (e.g., non-O blood types with pancreatic cancer), but this is distinct from secretor status. - Being an ABO non-secretor is not a primary, broadly recognized risk factor for developing cancer.

Question 1

Which anatomical structure lies between the bulla ethmoidalis and the uncinate process of the ethmoid?

Accepted Answer

Ethmoidal infundibulum

Answer

Bulla ethmoidalis

Answer

Uncinate process of ethmoid

Answer

Maxillary sinus

Question 2

What is the type of epithelium of the adenoid?

Accepted Answer

Pseudostratified ciliated columnar epithelium

Answer

Non-keratinized squamous epithelium

Answer

Cuboidal epithelium

Answer

Columnar epithelium with goblet cells

Question 3

In a community of 1,000,000 population, 105 children were born in a year, out of which 5 were stillbirths and 4 died within the first year of life. What is the Infant Mortality Rate (IMR)?

Accepted Answer

40

Answer

90

Answer

120

Answer

150

Question 4

Bladder cancer can occur in those who are working in dye industry for 25 years. Which study design is most appropriate for establishing a causal relationship between dye industry work and bladder cancer?

Accepted Answer

Cohort study

Answer

Cross-sectional study

Answer

Case-control study

Answer

Randomized control trial

Question 5

Multiphasic screening means-

Accepted Answer

Application of two or more screening tests in combination at one time

Answer

Application of two or more screening tests in combination at different geographical areas

Answer

Application of separate screening tests for different diseases

Answer

Application of two or more screening tests in combination at different times

Question 6

The absorption elution technique is used for?

Accepted Answer

Detection of blood groups

Answer

Examination of seminal stains

Answer

Detection of species

Answer

None of the options

Question 7

Which type of DNase produced by Streptococcus is known to be the most antigenic in humans?

Accepted Answer

DNase B

Answer

DNase C

Answer

DNase D

Answer

DNase A

Question 8

In the context of diagnosing syphilis, which of the following is an example of a precipitation test?

Accepted Answer

Kahn test

Answer

Rose waaler test

Answer

Widal test

Answer

Latex agglutination

Question 9

Rigid gas permeable (RGP) lenses are made from which of the following combinations of materials?

Accepted Answer

Copolymer of PMMA, Silicon containing monomer & cellulose acetyl butyrate

Answer

Hydroxymethylmethacrylate

Answer

Cellulose acetate Butyrate

Answer

Polymethylmethacrylate

Question 10

ABO non- secretors are more prone to ?

Accepted Answer

Increased risk of infections

Answer

Autoimmune diseases

Answer

Cardiovascular diseases

Answer

Cancer

NEET-PG 2015

Anatomy

Community Medicine

Forensic Medicine

Microbiology

Ophthalmology

Pathology