UPSC-CMS 2009 - Community Medicine Practice Questions

Q: Amniocentesis in early pregnancy for genetic disorders is a kind of

primary prevention. ***primary prevention*** - **Primary prevention** aims to *prevent disease from occurring* in the first place by reducing exposure to risk factors and preventing the birth of affected individuals - Amniocentesis in early pregnancy is a **prenatal diagnostic test** that detects genetic disorders in the fetus (who is at risk but not yet diseased) - The goal is to *prevent the occurrence* of genetic disease in the population by enabling informed reproductive decisions and preventing the birth of severely affected infants - This is classified as primary prevention because it **prevents the disease from manifesting** in the community *secondary prevention* - **Secondary prevention** focuses on *early detection and treatment* of disease in individuals who are already affected but asymptomatic - Examples include cancer screening (mammography, Pap smear), hypertension screening, and diabetes screening in adults - Amniocentesis is NOT secondary prevention because the fetus is not yet "diseased" – testing occurs before disease manifestation to prevent it *tertiary prevention* - **Tertiary prevention** aims to *reduce complications* and disability from established, symptomatic disease - Focuses on rehabilitation, preventing progression, and improving quality of life after disease has occurred - Examples include physiotherapy after stroke, insulin therapy for diabetes, and cardiac rehabilitation *primordial prevention* - **Primordial prevention** addresses *underlying determinants* of disease by preventing risk factors from developing in the population - Involves broad public health policies, environmental modifications, and socioeconomic interventions - Examples include tobacco control policies, promoting healthy urban design, and reducing environmental pollution

Q: Which one of the following is a correct combination regarding Indian population?

Blood group O 40%; Rh negative 7%. ***Blood group O 40%; Rh negative 7%*** - In the Indian population, **Blood group O** is indeed the most common, accounting for approximately **30-40%** of the population. - The prevalence of **Rh-negative** individuals in India is relatively low, typically around **5-7%**, making this combination accurate. *Blood group AB 20%; Rh negative 15%* - **Blood group AB** is the least common blood group, typically less than **10%** in the Indian population, making 20% an overestimation. - **Rh negative** prevalence of 15% is significantly higher than the reported figures for India, which are usually around 5-7%. *Blood group A 40%; Rh positive 80%* - While **Blood group A** is common, 40% might be slightly higher than some estimates, which often place it closer to 20-25%. - **Rh positive** prevalence in India is much higher than 80%, typically around **93-95%**, making 80% an underestimation. *Blood group B 33%; Rh positive 99%* - **Blood group B** is also very common in India, often around 30-35%, so 33% is a reasonable estimate. - However, **Rh positive** prevalence of 99% is an overestimation; the actual prevalence is closer to **93-95%**.

Q: The law stating that "the relative frequencies of each gene allele tend to remain constant from generation to generation" is known as

Hardy-Weinberg Law. ***Hardy-Weinberg Law*** - The **Hardy-Weinberg principle** states that allele and genotype frequencies in a population will remain constant from generation to generation in the absence of other evolutionary influences. - This law provides a baseline for understanding how populations evolve by identifying the conditions under which evolution *does not* occur. *Lamarck's Law* - **Lamarck's theory of inheritance of acquired characteristics** suggested that traits acquired during an organism's lifetime could be passed on to offspring. - This concept is largely disproven and not relevant to allele frequency constancy across generations. *David-Morgan's Law* - This is not a recognized law in genetics. There was a prominent geneticist named **Thomas Hunt Morgan**, whose work focused on fruit flies and established the **chromosome theory of inheritance** and concepts like linkage and crossing over. - While significant to genetics, his work does not describe the constancy of allele frequencies in a population. *Mendel's Law* - **Mendel's Laws of Inheritance** (segregation and independent assortment) describe how traits are passed from parents to offspring through the inheritance of discrete units (genes). - While fundamental to explaining inheritance, they do not directly state that allele frequencies remain constant in a population across generations under specific conditions, as the Hardy-Weinberg law does.

Q: Other than cataract, which one among the following is the highest prevalent cause of blindness in the world ?

Glaucoma. ***Glaucoma*** - **Glaucoma** is the **second leading cause of blindness globally** after cataract, accounting for approximately 12-15% of all cases of blindness worldwide. - It is a group of eye conditions that damage the optic nerve, often due to elevated intraocular pressure, leading to **irreversible vision loss**. - Unlike cataract, glaucoma-induced blindness is **irreversible**, making it a major public health concern. - The prevalence is particularly high in older populations and varies by type (primary open-angle, angle-closure, etc.). *Corneal opacity* - **Corneal opacity** is an important cause of blindness, especially in developing countries, resulting from infections (corneal ulcers), trauma, vitamin A deficiency, and trachoma sequelae. - While significant, it accounts for approximately 4-5% of global blindness, ranking **below glaucoma** in overall prevalence. - Prevention through nutrition programs and timely treatment of infections has reduced its burden. *Trachoma* - **Trachoma**, caused by *Chlamydia trachomatis*, is a chronic keratoconjunctivitis and was historically a leading infectious cause of blindness. - Due to WHO's GET2020 (Global Elimination of Trachoma by 2020) initiative and SAFE strategy (Surgery, Antibiotics, Facial cleanliness, Environmental improvement), its prevalence has **declined significantly**. - It now accounts for less than 3% of global blindness. *Diabetic retinopathy* - **Diabetic retinopathy** is a growing cause of blindness, particularly in developed countries and among working-age adults, due to the diabetes epidemic. - It accounts for approximately 5% of global blindness. - While its prevalence is increasing, it remains **below glaucoma** as a cause of global blindness.

Q: In a programme, analysis of results in comparison to cost is known as

Cost benefit analysis. ***Cost benefit analysis*** - In **cost-benefit analysis**, the **benefits of a program** are quantified in monetary terms and then compared directly with the **monetary cost** of the program. - This method is used to determine if the **monetary gain (or benefit)** from a program outweighs its monetary expenditure. *Cost effective analysis* - **Cost-effectiveness analysis** compares the **costs of alternative programs** with their effectiveness, usually measured in natural units suitable for the health outcome (e.g., lives saved, cases cured). - It does not assign a monetary value to the health outcome but rather identifies the intervention that achieves the **desired outcome at the lowest cost** or the maximum outcome for a given cost. *Management by objectives* - **Management by objectives (MBO)** is a strategic management model that aims to improve organizational performance by clearly defining objectives that are agreed to by both management and employees. - This concept is primarily about **setting goals and tracking performance** within an organization, not about analyzing program costs versus outcomes. *Cost utility study* - A **cost-utility analysis (CUA)** is a type of cost-effectiveness analysis where the health outcome is measured in **quality-adjusted life years (QALYs)** or disability-adjusted life years (DALYs). - It accounts for both the **quantity and quality of life**, but it still does not express benefits in direct monetary terms.

Q: The degree to which a specific health care intervention achieves its objectives, when applied in a given population, is termed as its

Effectiveness. ***Effectiveness*** - **Effectiveness** measures how well an intervention performs in a **real-world setting** under usual conditions in a given population [1] - It assesses the degree to which a healthcare intervention achieves its **intended objectives** when applied in actual practice (as opposed to controlled trial conditions) [1] - Key distinction: effectiveness = real-world performance; efficacy = performance under ideal/controlled conditions [1] *Sensitivity* - **Sensitivity** is a diagnostic test parameter measuring the proportion of actual positive cases correctly identified by the test - It relates to **test accuracy**, not to the achievement of intervention objectives in a population *Impact* - **Impact** refers to the broader, longer-term consequences of an intervention on **health outcomes** or population health status - While related to effectiveness, impact is a more **comprehensive measure** that includes indirect effects and long-term changes, not just the direct achievement of specific intervention objectives [1] *Efficiency* - **Efficiency** relates to the relationship between **resources used** (cost, time, personnel) and **results achieved** - It addresses whether an intervention achieves its objectives with **optimal resource utilization**, focusing on cost-effectiveness rather than simply whether objectives are met

Q: ICDS Scheme does not include

Primary school children. ***Primary school children*** - The **Integrated Child Development Services (ICDS) Scheme** primarily targets vulnerable groups like children under **six years of age**, pregnant women, and lactating mothers for integrated health, nutrition, and early learning services. - **Primary school children** (typically aged 6 and above) fall outside the core beneficiary group of the ICDS Scheme, as they are covered by other educational and health programs. *Pregnant women* - **Pregnant women** are a key beneficiary group under ICDS, receiving nutritional supplements, health check-ups, and health and nutrition education. - These services aim to improve maternal health outcomes and the health of the unborn child. *Children in the age group of 0-6 years* - **Children aged 0-6 years** are the primary beneficiaries of the ICDS Scheme, receiving supplementary nutrition, immunization, health check-ups, and pre-school education. - This age group is critical for growth and development, making them a central focus of the program. *Lactating women* - **Lactating women** are a crucial beneficiary group under ICDS, similar to pregnant women, receiving nutritional support, health services, and counseling on infant and young child feeding practices. - Support for lactating mothers is essential for ensuring proper nutrition for both the mother and the breastfeeding infant.

Q: Which one of the following is the correct chronological sequence in which the national programs were launched in India for the given diseases ?

Malaria, Filaria, TB, Anemia. **Correct Answer: Malaria, Filaria, TB, Anemia** - The correct chronological order of program launches is **National Malaria Control Programme (1953)**, **National Filaria Control Programme (1955)**, **National Tuberculosis Programme (1962)**, and **National Anaemia Prophylaxis Programme (1970)**. - This sequence reflects the historical public health priorities and disease burden observed in India during the mid-20th century. - Malaria and Filaria were among the earliest major disease control initiatives in post-independence India. *Incorrect: Malaria, Anemia, Filaria, TB* - This option incorrectly places **Anemia** (1970) before **Filaria** (1955) and **TB** (1962). - The National Anaemia Prophylaxis Programme was launched much later than the Filaria and TB control programs. *Incorrect: Anemia, Filaria, TB, Malaria* - This sequence is incorrect as **Anemia** (1970) is placed first, while the National Malaria Control Programme (1953) was actually one of the earliest major disease control initiatives. - Malaria was a primary focus of public health efforts in the early post-independence era. *Incorrect: Anemia, TB, Malaria, Filaria* - This option is completely incorrect as **Anemia** (1970) is placed first instead of last. - The actual sequence shows Malaria (1953) and Filaria (1955) were addressed much earlier than TB (1962) and Anemia (1970).

Q: To understand the relationship between weight and height of a group of school children, the data can graphically be best depicted through

Scatter diagram. ***Scatter diagram*** - A **scatter diagram** (also called a scatter plot) is ideal for showing the relationship between **two continuous variables**, such as weight and height. - Each point on the graph represents an individual's paired values for weight and height, allowing visual identification of **patterns or correlations**. *Histogram* - A **histogram** is used to display the distribution of **a single continuous variable**, showing the frequency of data points within specific intervals or bins. - It would not effectively demonstrate the **relationship or correlation** between two variables simultaneously. *Bar diagram* - A **bar diagram** (or bar chart) is typically used for comparing **categorical data** or discrete values, showing frequencies or proportions for different categories. - It is not suitable for visualizing the relationship between **two continuous numerical variables** like weight and height. *Pictogram* - A **pictogram** uses images or symbols to represent data, often used for presenting simple statistics to a general audience. - It is generally used for **categorical data** or simple comparisons and lacks the precision needed to display the continuous relationship between weight and height.

Q: In a normal curve, the area of one standard deviation around the mean includes which of the following per cent of values in a distribution ?

68.3%. ***68.3%*** - In a **normal distribution**, approximately 68.3% of the data falls within **one standard deviation** (±1σ) of the mean. - This is a fundamental property of the **empirical rule** (68-95-99.7 rule) applied to normally distributed data. *95.4%* - This percentage represents the data within **two standard deviations** (±2σ) of the mean in a normal distribution. - It is often rounded to 95% for confidence intervals, but the precise value is 95.4%. *48.6%* - This value does not correspond to a standard interval around the mean in a **normal distribution**. - It might be a distracter derived from incorrectly calculating or misremembering the percentages of the empirical rule. *99.7%* - This percentage represents the data within **three standard deviations** (±3σ) of the mean in a normal distribution. - It indicates that almost all data points in a normal curve lie within this range.

Question 1

Amniocentesis in early pregnancy for genetic disorders is a kind of

Accepted Answer

primary prevention

Answer

secondary prevention

Answer

tertiary prevention

Answer

primordial prevention

Question 2

Which one of the following is a correct combination regarding Indian population?

Accepted Answer

Blood group O 40%; Rh negative 7%

Answer

Blood group AB 20%; Rh negative 15%

Answer

Blood group A 40%; Rh positive 80%

Answer

Blood group B 33%; Rh positive 99%

Question 3

The law stating that "the relative frequencies of each gene allele tend to remain constant from generation to generation" is known as

Accepted Answer

Hardy-Weinberg Law

Answer

Lamarck's Law

Answer

David-Morgan's Law

Answer

Mendel's Law

Question 4

Other than cataract, which one among the following is the highest prevalent cause of blindness in the world ?

Accepted Answer

Glaucoma

Answer

Trachoma

Answer

Corneal opacity

Answer

Diabetic retinopathy

Question 5

In a programme, analysis of results in comparison to cost is known as

Accepted Answer

Cost benefit analysis

Answer

Cost effective analysis

Answer

Management by objectives

Answer

Cost utility study

Question 6

The degree to which a specific health care intervention achieves its objectives, when applied in a given population, is termed as its

Accepted Answer

Effectiveness

Answer

Sensitivity

Answer

Impact

Answer

Efficiency

Question 7

ICDS Scheme does not include

Accepted Answer

Primary school children

Answer

Pregnant women

Answer

Children in the age group of 0-6 years

Answer

Lactating women

Question 8

Which one of the following is the correct chronological sequence in which the national programs were launched in India for the given diseases ?

Accepted Answer

Malaria, Filaria, TB, Anemia

Answer

Malaria, Anemia, Filaria, TB

Answer

Anemia, Filaria, TB, Malaria

Answer

Anemia, TB, Malaria, Filaria

Question 9

To understand the relationship between weight and height of a group of school children, the data can graphically be best depicted through

Accepted Answer

Scatter diagram

Answer

Histogram

Answer

Bar diagram

Answer

Pictogram

Question 10

In a normal curve, the area of one standard deviation around the mean includes which of the following per cent of values in a distribution ?

Accepted Answer

68.3%

Answer

95.4%

Answer

48.6%

Answer

99.7%

UPSC-CMS 2009 — Community Medicine