Community Medicine
7 questionsWhich is the least common cause among these of infant mortality in India?
What is the purpose of work sampling in industrial engineering?
Child protection scheme is under which ministry?
All of the following are characteristics of case control study except:
Transovarian transmission is seen in which of the following infections?
Which of the following diseases does not have a chronic carrier state?
What does a highly sensitive test imply about its false negative rate?
NEET-PG 2012 - Community Medicine NEET-PG Practice Questions and MCQs
Question 511: Which is the least common cause among these of infant mortality in India?
- A. Infections
- B. Birth injuries (Correct Answer)
- C. Congenital malformations
- D. Prematurity
Explanation: ***Birth injuries*** - While significant in some contexts, **birth injuries** are a less common cause of infant mortality in India compared to other factors like infections, prematurity, and congenital malformations. - Progress in **obstetric care** and improvements in delivery practices have helped reduce their incidence as a primary cause of death. *Infections* - **Infections**, particularly **neonatal sepsis**, pneumonia, and diarrhea, remain a leading cause of infant mortality in India. - Poor sanitation, lack of access to clean water, and inadequate vaccination coverage contribute significantly to their prevalence. *Congenital malformations* - **Congenital malformations** (birth defects) are a substantial cause of infant mortality in India, particularly those affecting the heart, brain, and neural tube. - Early detection and intervention for these conditions are often limited, increasing their impact on mortality rates. *Prematurity* - **Prematurity** (being born too early) and its associated complications, such as respiratory distress syndrome and low birth weight, are major contributors to infant mortality in India. - Many premature infants struggle with underdeveloped organs and systems, making them highly vulnerable in the first few weeks of life.
Question 512: 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.
Question 513: Child protection scheme is under which ministry?
- A. Ministry of Social Justice and Empowerment
- B. Ministry of Health and Family Welfare
- C. Ministry of Education
- D. Ministry of Women and Child Development (Correct Answer)
Explanation: ***Ministry of Women and Child Development*** - The **Ministry of Women and Child Development** is the nodal ministry in India responsible for formulating and administering laws, policies, and programs concerning women and children, including child protection schemes. - This ministry works to ensure the overall development, welfare, and protection of children, addressing issues such as child abuse, exploitation, and trafficking through various initiatives. *Ministry of Health and Family Welfare* - This ministry primarily deals with **public health**, healthcare services, and family planning, focusing on the health and nutritional aspects of children, but not their overall protection and welfare schemes. - While it contributes to child well-being through health programs, it does not oversee the comprehensive **child protection framework**. *Ministry of Social Justice and Empowerment* - This ministry focuses on the welfare, social justice, and empowerment of **marginalized and vulnerable sections** of society, including persons with disabilities, scheduled castes, and other backward classes. - While it addresses social welfare, its primary mandate is not specific to the overall **child protection scheme**, which falls under a dedicated ministry. *Ministry of Education* - The Ministry of Education is responsible for the **educational system**, including primary, secondary, and higher education. - While it promotes children's development through education, it does not have the mandate for the broader **child protection schemes** that address safety, welfare, and legal aspects beyond schooling.
Question 514: All of the following are characteristics of case control study except:
- A. Quick results are obtained
- B. Measures incidence rate (Correct Answer)
- C. Inexpensive study
- D. Proceeds from effect to cause
Explanation: ***Correct: Measures incidence rate*** - A **case-control study** proceeds from effect (disease) to cause (exposure) and thus does **NOT measure the incidence rate** of a disease. - Case-control studies calculate **odds ratios**, not incidence rates. - **Incidence rate** is typically measured in **cohort studies**, where a group of individuals is followed over time to observe the development of new cases of a disease. *Incorrect: Quick results are obtained* - Case-control studies are generally **retrospective**, meaning they look back in time from the outcome (disease) to identify past exposures. - This design allows for **quicker data collection** and analysis compared to prospective studies like cohort studies, which follow individuals over time. - This IS a characteristic of case-control studies. *Incorrect: Proceeds from effect to cause* - In a case-control study, researchers start by identifying individuals with the **disease (cases)** and a comparable group without the disease (controls). - They then investigate past exposures in both groups to determine potential **risk factors** or causes. - This IS a characteristic of case-control studies. *Incorrect: Inexpensive study* - Case-control studies are typically **less expensive** than other analytical study designs, such as cohort studies. - This is because they do not require long-term follow-up of a large population, reducing costs associated with repeated measurements and participant retention. - This IS a characteristic of case-control studies.
Question 515: Transovarian transmission is seen in which of the following infections?
- A. Plague
- B. Ebola fever
- C. Yellow fever (Correct Answer)
- D. None of the options
Explanation: ***Yellow fever*** - **Transovarian transmission** refers to the passage of a pathogen from an adult female arthropod (like a mosquito) to her offspring via the eggs. This mechanism allows the virus to persist in the **vector population** even in the absence of infected vertebrate hosts. - **Yellow fever virus** is known to undergo transovarian transmission in its mosquito vectors, particularly *Aedes aegypti* and other *Aedes* species. *Plague* - Plague is caused by the bacterium *Yersinia pestis* and is primarily transmitted by **flea bites** from infected rodents to humans. - It does not involve transovarian transmission; the fleas acquire the bacteria during a **blood meal** from an infected host. *Ebola fever* - Ebola virus is transmitted through **direct contact** with blood or bodily fluids of infected humans or animals. - It is not an **arthropod-borne disease** and therefore does not exhibit transovarian transmission. *None of the options* - This option is incorrect because **Yellow Fever** clearly demonstrates transovarian transmission within its mosquito vector.
Question 516: Which of the following diseases does not have a chronic carrier state?
- A. Malaria
- B. Tetanus (Correct Answer)
- C. Measles
- D. Poliomyelitis
Explanation: ***Tetanus*** - Tetanus is caused by the toxin produced by *Clostridium tetani*, which is an **environmental bacterium** found in soil and does not establish a persistent infection within humans. - Humans are merely **accidental hosts** for this bacterium, meaning there is **no chronic carrier state** where an infected individual continuously harbors and transmits the pathogen. - The disease occurs through wound contamination with spores, not human-to-human transmission. *Measles* - Measles is an **acute viral infection** with no chronic carrier state in the classical sense. - After acute infection, the virus is cleared from the body in immunocompetent individuals. - While **subacute sclerosing panencephalitis (SSPE)** represents a rare persistent infection, this is **not a carrier state** as the virus is not transmissible from these individuals. - SSPE occurs years after initial infection but does not involve viral shedding or transmission. *Malaria* - Individuals infected with ***Plasmodium* parasites** can develop a **chronic carrier state**, particularly with *P. vivax* and *P. ovale*, which form hypnozoites in the liver. - These parasites can remain dormant and then reactivate, causing **relapses** and allowing for continued transmission to mosquitoes over extended periods. - Chronic asymptomatic carriers can serve as reservoirs for transmission in endemic areas. *Poliomyelitis* - Individuals infected with poliovirus can shed the virus in their stools for **several weeks to months** after infection. - In **immunodeficient individuals**, prolonged excretion can occur for years, creating chronic carriers. - This prolonged shedding allows for the **continued transmission** of the virus within a population.
Question 517: What does a highly sensitive test imply about its false negative rate?
- A. High false positive rate
- B. Low false negative rate (Correct Answer)
- C. High true negative rate
- D. High true positive rate
Explanation: ***Low false negative rate*** - A highly **sensitive test** is good at identifying true positives, meaning it correctly identifies most people who have the disease. - Sensitivity = TP/(TP+FN), so high sensitivity mathematically means few false negatives. - This characteristic directly translates to a **low false negative rate**, as few people with the disease will be missed. *High false positive rate* - A high **false positive rate** relates to **specificity**, not sensitivity. - False positive rate = FP/(FP+TN), which measures how many healthy people are incorrectly identified as diseased. - While some sensitive tests may have lower specificity (higher FP rate), this is not a direct implication of high sensitivity. *High true negative rate* - A high **true negative rate** is a characteristic of a highly **specific** test, which correctly identifies people who do **not** have the disease. - True negative rate = TN/(TN+FP) = Specificity. - **Sensitivity** and **specificity** are independent measures, so high sensitivity does not imply a high true negative rate. *High true positive rate* - High **true positive rate** is actually another term for high sensitivity (Sensitivity = TPR = TP/(TP+FN)). - While this is true of a sensitive test, the question specifically asks about the implication for the **false negative rate**. - The **most direct answer** regarding false negatives is "low false negative rate" rather than describing the true positive rate.
Internal Medicine
1 questionsAmong the following, most reliable test for screening of diabetes mellitus?
NEET-PG 2012 - Internal Medicine NEET-PG Practice Questions and MCQs
Question 511: Among the following, most reliable test for screening of diabetes mellitus?
- A. Urine sugar
- B. Random sugar
- C. Fasting sugar (Correct Answer)
- D. Glucose tolerance test
Explanation: ***Fasting sugar*** - A **fasting plasma glucose** (FPG) test is the most common and reliable initial test for screening for **diabetes mellitus** because it measures blood glucose after an overnight fast (typically 8-12 hours), providing a baseline level unaffected by recent food intake [1]. - A fasting glucose level of **≥ 126 mg/dL** (7.0 mmol/L) on two separate occasions is diagnostic of diabetes, making it an excellent screening tool for identifying individuals with impaired glucose metabolism [1]. *Random sugar* - A random plasma glucose test can be used to diagnose diabetes if the level is **≥ 200 mg/dL** (11.1 mmol/L) in a symptomatic individual, but it is less reliable for screening asymptomatic individuals due to its variability depending on recent food intake [1]. - Because it can be measured at any time of day without regard to the last meal, it has a **lower sensitivity** for detecting early stages of diabetes compared to fasting glucose. *Glucose tolerance test* - An **oral glucose tolerance test** (OGTT) is highly sensitive and specific for diagnosing diabetes and impaired glucose tolerance, but it is more cumbersome and time-consuming, involving multiple blood draws over two hours after consuming a sugary drink. - While it is a definitive diagnostic test, its complexity makes it **less practical for routine screening** in large populations compared to simpler tests like fasting plasma glucose. *Urine sugar* - The presence of glucose in urine (glycosuria) indicates that blood glucose levels have exceeded the **renal threshold** (typically around 180 mg/dL), meaning the kidneys are unable to reabsorb all the glucose. - This is a **less sensitive and specific** method for screening, as it only becomes positive once blood glucose is significantly elevated, and it does not detect milder forms of impaired glucose metabolism or early diabetes.
Microbiology
1 questionsWhich of the following statements about interferons is true?
NEET-PG 2012 - Microbiology NEET-PG Practice Questions and MCQs
Question 511: 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.
Obstetrics and Gynecology
1 questionsWhich contraceptive method has the lowest pregnancy failure rate (typical use)?
NEET-PG 2012 - Obstetrics and Gynecology NEET-PG Practice Questions and MCQs
Question 511: Which contraceptive method has the lowest pregnancy failure rate (typical use)?
- A. Diaphragm
- B. Condom
- C. Intrauterine Contraceptive Device (IUCD) (Correct Answer)
- D. Oral Contraceptive Pills (OCP)
Explanation: ***Intrauterine Contraceptive Device (IUCD)*** - **IUCDs** are highly effective, with a **pregnancy failure rate of less than 1%** in typical use due to their long-acting and reversible nature, requiring no daily action from the user. - They are **fit-and-forget methods**, eliminating user error inherent in other forms of contraception, leading to very low typical use failure rates. *Diaphragm* - The **diaphragm** has a significantly higher typical use failure rate (around 12-16%) because its effectiveness depends on **correct placement** and consistent use with spermicide before each intercourse. - It is a **user-dependent method**, making its efficacy susceptible to improper use or non-use during sexual activity. *Condom* - **Condoms** have a typical use failure rate of about 13-18%, largely due to **incorrect use**, breakage, or slippage. - Their effectiveness relies heavily on **consistent and proper application** with every act of intercourse. *Oral Contraceptive Pills (OCP)* - **Oral Contraceptive Pills (OCPs)** have a typical use failure rate of approximately 7-9%, primarily because effectiveness is dependent on **daily adherence** at roughly the same time. - **Missed pills** are a common reason for failure, significantly increasing the risk of pregnancy compared to methods that do not require daily action.