Community Medicine
1 questionsWhat is the purpose of work sampling in industrial engineering?
NEET-PG 2012 - Community Medicine NEET-PG Practice Questions and MCQs
Question 551: What is the purpose of work sampling in industrial engineering?
- A. None of the options
- B. Conducted over a short duration
- C. Sampling done for individual tasks
- D. Assessment of how workers spend their time on various activities (Correct Answer)
Explanation: ***Assessment of how workers spend their time on various activities*** - **Work sampling** is a statistical technique used to determine the **proportion of time** that workers spend on different activities. - This method provides insights into **utilization rates**, identifying areas of potential inefficiency or underutilization of resources. *Conducted over a short duration* - While individual observations are brief, **work sampling studies** are typically conducted over an **extended period** to ensure that all variations in work activities and conditions are captured. - A short duration may not provide a **representative sample** of the work activities, leading to inaccurate conclusions. *None of the options* - This option is incorrect because there is a valid purpose for work sampling among the given choices. - Work sampling has a specific and well-defined application in **industrial engineering** for performance analysis. *Sampling done for individual tasks* - Work sampling is not limited to individual tasks; it assesses the **overall distribution of time** spent across various tasks and non-work activities. - It provides a **macro-level view** of how time is allocated within a work environment, rather than a detailed breakdown of each individual task's duration.
Dermatology
1 questionsWhich of the following statements is true regarding donovanosis?
NEET-PG 2012 - Dermatology NEET-PG Practice Questions and MCQs
Question 551: Which of the following statements is true regarding donovanosis?
- A. Pseudolymphadenopathy is characteristic
- B. Penicillin is used for treatment
- C. Painful ulcer is characteristic
- D. Painless ulcerative lesions are characteristic of donovanosis (Correct Answer)
Explanation: ***Painless ulcerative lesions are characteristic of donovanosis*** - Donovanosis, also known as granuloma inguinale, is characterized by **painless, progressive ulcerative lesions** that can bleed easily. - The lesions typically start as papules or nodules and then erode to form **granulomatous ulcers** with a beefy red appearance. - This is a key distinguishing feature from chancroid (painful ulcers) and primary syphilis. *Pseudolymphadenopathy is characteristic* - While donovanosis can lead to swelling in the inguinal region, it's typically **pseudobuboes** (subcutaneous granulomas) rather than true lymphadenopathy. - However, this is not a defining characteristic, as pseudobuboes are less common and occur in advanced cases. - The primary feature remains the **painless ulcerative lesions**. *Penicillin is used for treatment* - **Penicillin** is not the standard treatment for donovanosis; it is ineffective against *Klebsiella granulomatis*. - The recommended treatment involves **macrolides** (e.g., azithromycin) or **tetracyclines** (e.g., doxycycline) for at least 3 weeks or until lesions heal. - Alternative regimens include **cotrimoxazole** or **fluoroquinolones**. *Painful ulcer is characteristic* - Donovanosis ulcers are typically **painless**, which distinguishes them from other genital ulcers like those seen in herpes or chancroid. - The **lack of pain** often contributes to delayed presentation and progression of the disease.
Microbiology
2 questionsHow many flagella does Helicobacter pylori typically have?
Which of the following statements about interferons is true?
NEET-PG 2012 - Microbiology NEET-PG Practice Questions and MCQs
Question 551: How many flagella does Helicobacter pylori typically have?
- A. 4-6 (Correct Answer)
- B. 3
- C. 2
- D. 1
Explanation: ***4-6*** - *Helicobacter pylori* is characterized by having **multiple flagella** (typically 4-6) at one pole, which are crucial for its motility. - These flagella allow the bacterium to move through the viscous gastric mucus layer and colonize the gastric epithelium. *1* - While some bacteria, like *Vibrio cholerae*, may possess a single polar flagellum, this is not characteristic of *Helicobacter pylori*. - A single flagellum would provide less efficient motility in the challenging environment of the stomach. *2* - Having two flagella is not the typical configuration for *Helicobacter pylori*. - Many bacteria have varied flagellar arrangements, but two is not representative of this particular bacterium. *3* - Three flagella is an insufficient number for the characteristic motility and colonization strategy of *Helicobacter pylori*. - **Lophotrichous** flagella typically refers to a tuft of multiple flagella, consistent with 4-6.
Question 552: Which of the following statements about interferons is true?
- A. Interferons inhibit viral replication in host cells. (Correct Answer)
- B. Interferons are specific for particular viruses.
- C. Interferons have no effect on viral infections.
- D. Interferons are synthetic antiviral agents.
Explanation: **Interferons inhibit viral replication in host cells.** - Interferons are a crucial part of the **innate immune response** against viral infections. - They work by inducing an **antiviral state** in neighboring uninfected cells, preventing viral replication. - Interferons are **non-specific** antiviral cytokines with broad-spectrum activity. *Interferons are specific for particular viruses.* - This is incorrect. Interferons are **virus-non-specific** in their antiviral action. - While their production is triggered by viral infection, they can inhibit replication of various different viruses. - This broad-spectrum activity is a key feature distinguishing them from antibodies (which are specific). *Interferons have no effect on viral infections.* - This is false. Interferons are potent **antiviral cytokines** essential for host defense against viruses. - They activate immune cells (NK cells, macrophages) and induce expression of genes that inhibit viral processes. *Interferons are synthetic antiviral agents.* - This is incorrect. Interferons are **naturally produced proteins** by the body's cells (leukocytes, fibroblasts, dendritic cells) in response to viral infections. - While recombinant interferons are used therapeutically, interferons are biological molecules, not synthetic drugs.
Ophthalmology
4 questionsSatellite nodules are typically associated with which of the following conditions?
Which of the following is a known complication of vernal keratoconjunctivitis?
What is the definition of the visual axis in relation to the eye?
How is dioptric power related to focal length?
NEET-PG 2012 - Ophthalmology NEET-PG Practice Questions and MCQs
Question 551: Satellite nodules are typically associated with which of the following conditions?
- A. Tuberculosis
- B. Sarcoidosis
- C. Viral ulcer
- D. Fungal corneal ulcer (Correct Answer)
Explanation: ***Fungal corneal ulcer*** - **Satellite lesions** (small, isolated infiltrates surrounding a larger central ulcer) are a characteristic feature of **fungal keratitis**, indicating the spread of fungal hyphae. - Unlike bacterial ulcers, fungal ulcers often have a feathery, indistinct margin and can be slow-growing. *Tuberculosis* - Ocular tuberculosis can present with granulomatous inflammation, often involving the uvea or retina, but **satellite nodules** around a corneal ulcer are not typical. - Corneal involvement in tuberculosis is rare and usually manifests as interstitial keratitis or phlyctenular keratitis. *Sarcoidosis* - Ocular sarcoidosis commonly causes **uveitis**, conjunctival nodules, or retinal vasculitis. - While it can cause corneal deposits or band keratopathy, it does not typically present with satellite lesions around a primary corneal ulcer. *Viral ulcer* - Viral corneal ulcers, particularly those caused by **herpes simplex virus**, often present as **dendritic ulcers** or geographic ulcers. - Although epithelial lesions can spread, the distinct **satellite infiltrates** in the stroma seen in fungal infections are not characteristic of viral keratitis.
Question 552: Which of the following is a known complication of vernal keratoconjunctivitis?
- A. Keratoconus (Correct Answer)
- B. Retinal detachment
- C. Vitreous hemorrhage
- D. Cataract
Explanation: ***Keratoconus*** - **Vernal keratoconjunctivitis (VKC)** is a chronic allergic eye condition associated with persistent eye rubbing, which can lead to thinning and bulging of the cornea, a condition known as **keratoconus**. - Long-term inflammation and mechanical stress from allergic reactions and *eye rubbing* contribute to the corneal structural changes seen in keratoconus. - This is the **most common and well-recognized complication** of VKC. *Cataract* - While cataracts can occur in VKC patients (particularly from **chronic topical steroid use** or severe disease with shield ulcers), they are **less common than keratoconus** as a direct complication. - Keratoconus remains the more characteristic and frequently encountered complication specifically associated with the mechanical trauma of eye rubbing in VKC. *Retinal detachment* - **Retinal detachment** is a condition where the retina separates from its underlying support tissues and is typically associated with trauma, high myopia, or diabetic retinopathy, not VKC. - VKC primarily affects the conjunctiva and cornea, and its inflammatory processes do not directly cause retinal detachment. *Vitreous hemorrhage* - **Vitreous hemorrhage** involves bleeding into the gel-like substance that fills the eye and is commonly caused by conditions like diabetic retinopathy or retinal tears, not VKC. - VKC does not involve the posterior segment of the eye in a way that would lead to vitreous hemorrhage.
Question 553: What is the definition of the visual axis in relation to the eye?
- A. Line from the object to the fovea (Correct Answer)
- B. Line from the center of the lens to the cornea
- C. Line from the center of the cornea to the center of the lens
- D. None of the options
Explanation: ***Line from the object to the fovea*** - The **visual axis** is the theoretical line connecting the **object of regard** in the external world to the **fovea centralis** (the area of sharpest vision) on the retina. - This axis passes through the **nodal points** of the eye, which are conceptual points within the lens system acting as optical centers. *Line from the center of the lens to the cornea* - This description does not correspond to any standard anatomical or optical axis of the eye. - The **cornea** and **lens** are parts of the eye's refracting system, but a line solely between their centers would not define visual perception. *Line from the center of the cornea to the center of the lens* - This line is generally referred to as the **optical axis**, which is an anatomical reference line. - The optical axis typically passes through the centers of curvature of the refractive surfaces, but it does not necessarily align with the actual line of sight or the path of light from an object to the fovea. *None of the options* - This option is incorrect because the first option accurately defines the visual axis.
Question 554: How is dioptric power related to focal length?
- A. Directly to square of focal length
- B. Inversely to focal length (Correct Answer)
- C. Directly to focal length
- D. Inversely to square of focal length
Explanation: ***Inversely to focal length*** - Dioptric power, measured in **diopters**, is defined as the **reciprocal of the focal length** when the focal length is expressed in meters. - This inverse relationship means that a shorter focal length corresponds to a higher dioptric power, indicating stronger light-bending ability. *Directly to square of focal length* - The relationship between dioptric power and focal length is **linear** (inverse), not squared. - There is no direct proportional relationship with the square of the focal length in optical power calculations. *Directly to focal length* - Dioptric power is **inversely proportional** to focal length, not directly proportional. - As focal length increases, the power of the lens to converge or diverge light decreases. *Inversely to square of focal length* - Dioptric power is inversely proportional to the **focal length itself**, not its square. - The square of the focal length is not typically used in defining the dioptric power of a lens.
Pharmacology
2 questionsWhich type of vaccine is used for chicken pox?
Which of the following is not a selective serotonin reuptake inhibitor?
NEET-PG 2012 - Pharmacology NEET-PG Practice Questions and MCQs
Question 551: Which type of vaccine is used for chicken pox?
- A. Live vaccine (Correct Answer)
- B. Killed vaccine
- C. Conjugated vaccine
- D. Toxoid vaccine
Explanation: ***Live vaccine*** - The chickenpox vaccine (Varicella vaccine) is a **live-attenuated vaccine**, meaning it contains a weakened form of the **Varicella-zoster virus** (Oka strain). - This weakened virus can still replicate in the body, stimulating a strong and long-lasting immune response similar to natural infection but without causing severe disease. *Killed vaccine* - **Killed (inactivated) vaccines** use viruses or bacteria that have been inactivated through heat or chemicals, making them unable to replicate. - While effective for some diseases (e.g., inactivated polio, influenza), they typically require **multiple doses** and might provide less durable immunity compared to live vaccines. *Conjugated vaccine* - **Conjugated vaccines** are designed to improve the immune response to polysaccharide antigens (e.g., bacterial capsules) by linking them to a carrier protein. - This technology is primarily used for **bacterial infections** like *Haemophilus influenzae* type b (Hib) or pneumococcal disease, not viral illnesses like chickenpox. *Toxoid vaccine* - **Toxoid vaccines** contain inactivated bacterial toxins (toxoids) rather than the whole organism. - Examples include **tetanus and diphtheria vaccines**, which protect against diseases caused by bacterial toxins, not viral infections like chickenpox.
Question 552: Which of the following is not a selective serotonin reuptake inhibitor?
- A. Buspirone (Correct Answer)
- B. Citalopram
- C. Fluoxetine
- D. Fluvoxamine
Explanation: ***Buspirone*** - **Buspirone** is an anxiolytic that primarily acts as a **serotonin 5-HT1A receptor partial agonist**, not an SSRI. - It does not significantly affect the reuptake of serotonin, distinguishing it from SSRIs. *Fluoxetine* - **Fluoxetine** is a well-known and widely used **SSRI**. - It works by selectively inhibiting the reuptake of serotonin, thereby increasing its concentration in the synaptic cleft. *Fluvoxamine* - **Fluvoxamine** is another antidepressant classified as an **SSRI**. - It is often used for the treatment of **obsessive-compulsive disorder (OCD)** due to its strong serotonin reuptake inhibition. *Citalopram* - **Citalopram** is an **SSRI** frequently prescribed for depression and anxiety disorders. - Its mechanism involves potent and selective inhibition of **serotonin reuptake**.