Non-Communicable Diseases Practice Questions

Q: The crude death rate is an indicator that shows the relationship between which two factors?

Population and total mortality. ### Explanation **1. Why Option A is Correct:** The **Crude Death Rate (CDR)** is the simplest and most common measure of mortality in a population. It represents the number of deaths occurring during a specific year per 1,000 mid-year population. The formula is: $$\text{CDR} = \frac{\text{Total number of deaths during the year}}{\text{Estimated mid-year population}} \times 1000$$ By definition, it relates **total mortality** (all deaths regardless of cause) to the **total population** at risk. It is termed "crude" because it does not account for the age or sex composition of the population. **2. Why Other Options are Incorrect:** * **Option B (Proportional Mortality):** This relates the number of deaths due to a *specific cause* to the *total number of deaths* (not the total population). It is used to identify the leading causes of death within a group. * **Option C (Age-specific Mortality):** This relates the number of deaths in a *specific age group* to the *total population of that same age group*. It is a more refined indicator than CDR for comparing health status across different demographics. **3. NEET-PG High-Yield Pearls:** * **Denominator:** The denominator for CDR is always the **Mid-Year Population** (as of July 1st), which serves as an estimate of the average population at risk during the year. * **Limitation:** CDR is heavily influenced by the **age structure** of a population. A developed country with an aging population may have a higher CDR than a developing country with a younger population, even if health services are better. * **Standardization:** To compare mortality between two different populations, **Age-Standardized Death Rates** must be used to eliminate the confounding effect of age. * **Current Trend:** In India, the CDR has significantly declined over the decades due to improved public health measures.

Q: What is the most common cause of epidemic infective hepatitis?

Hepatitis E Virus (HEV). **Explanation:** The correct answer is **Hepatitis E Virus (HEV)**. In the context of public health and epidemiology, "epidemic" refers to a sudden increase in cases within a population. HEV is the most common cause of large-scale, water-borne epidemics of infective hepatitis in developing countries, including India. It is primarily transmitted via the **fecal-oral route**, often through contaminated drinking water. **Analysis of Options:** * **Hepatitis E (HEV):** It is the leading cause of both sporadic and epidemic viral hepatitis in India. It typically affects young adults and is notorious for causing high mortality (up to 20%) in **pregnant women** due to fulminant hepatic failure. * **Hepatitis A (HAV):** While also transmitted via the fecal-oral route, HAV is more commonly associated with **sporadic cases** and small clusters/outbreaks among children. In endemic areas, most children develop immunity early in life, making large-scale adult epidemics less common than HEV. * **Hepatitis B (HBV) & C (HCV):** These are transmitted via parenteral, sexual, or perinatal routes. They do not cause water-borne epidemics; instead, they are major causes of **chronic** hepatitis, cirrhosis, and hepatocellular carcinoma. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of acute viral hepatitis in India:** HEV (followed by HAV). * **Incubation Period:** HEV (2–8 weeks); HAV (2–6 weeks). * **Pregnancy Warning:** HEV in the 3rd trimester carries the highest risk of fulminant hepatitis. * **Zoonotic potential:** HEV Genotype 3 and 4 are associated with consumption of undercooked pork. * **Chronicity:** HEV generally does not cause chronic infection, except in immunocompromised individuals (e.g., organ transplant recipients).

Q: Which disease is primarily associated with rats?

Leptospirosis. **Explanation:** **Leptospirosis** is the correct answer because it is a classic zoonotic disease caused by the spirochete *Leptospira interrogans*. Rats (specifically the brown rat, *Rattus norvegicus*) are the most important **reservoir hosts**. The bacteria colonize the renal tubules of the rats and are excreted in their **urine**. Humans typically contract the infection through direct contact with contaminated water or moist soil (often during floods or agricultural work) via skin abrasions or mucous membranes. **Analysis of Incorrect Options:** * **Measles:** A highly contagious viral infection caused by the Rubeola virus. It is an exclusively human disease with no animal reservoir. * **Tetanus:** Caused by *Clostridium tetani* spores found in soil and animal feces (commonly horses/cattle). It is not "associated with rats" but rather with contaminated wounds. * **Influenza:** While some strains are zoonotic (birds/pigs), the common seasonal influenza is primarily a human-to-human respiratory infection. **High-Yield Clinical Pearls for NEET-PG:** * **Weil’s Disease:** The severe triad of Leptospirosis characterized by **jaundice, renal failure, and hemorrhage**. * **Occupational Hazard:** High risk in sewage workers, farmers, and miners. * **Incubation Period:** Usually 10 days (Range: 2–30 days). * **Drug of Choice:** **Doxycycline** is used for prophylaxis; **Penicillin G** is the treatment of choice for severe cases. * **Gold Standard Test:** Microscopic Agglutination Test (MAT).

Q: A measles epidemic can be anticipated when the proportion of susceptible children in a community reaches which percentage?

40%. ### Explanation **Concept: The Threshold of Herd Immunity in Measles** Measles is one of the most highly infectious diseases known, with a Basic Reproduction Number ($R_0$) typically ranging between 12 and 18. To prevent an epidemic, a very high level of herd immunity (90–95%) is required. In epidemiological terms, an epidemic is triggered when the **"critical mass" of susceptible individuals** reaches a specific threshold. For measles, it has been traditionally observed that an outbreak or epidemic becomes imminent when the proportion of susceptible children in the community reaches **40%**. At this point, the chain of transmission can no longer be contained by the existing immune population, leading to rapid spread. **Analysis of Options:** * **40% (Correct):** This is the established epidemiological threshold for measles. When 60% of the population is immune (and 40% susceptible), the density of susceptible hosts is high enough to sustain an epidemic. * **20% (Incorrect):** At 20% susceptibility (80% immunity), small clusters may occur, but a full-scale epidemic is usually averted due to partial herd effect. * **60% & 80% (Incorrect):** These levels represent extreme vulnerability. While an epidemic would certainly occur at these percentages, the *earliest* point at which an epidemic is anticipated is the 40% mark. **High-Yield Clinical Pearls for NEET-PG:** * **Herd Immunity Threshold ($HIT$):** Calculated as $1 - 1/R_0$. For measles, since $R_0$ is ~15, the $HIT$ is approximately 94%. * **Secondary Attack Rate (SAR):** Measles has a SAR of >90% among susceptible household contacts. * **Eradication vs. Elimination:** Measles is a candidate for eradication because there is no animal reservoir and an effective vaccine exists. * **Vaccine Timing:** Under the National Immunization Schedule (NIS), the 1st dose is given at 9 months and the 2nd dose at 16–24 months.

Q: What is the most common cancer affecting both males and females globally?

Lung cancer. **Explanation:** **Correct Option: C. Lung cancer** According to the latest **GLOBOCAN** data (WHO), **Lung Cancer** remains the most common cancer globally when considering both sexes combined. It accounts for approximately 12.4% of all new cancer cases and is also the leading cause of cancer-related mortality worldwide. The high incidence is primarily attributed to the global prevalence of tobacco smoking and increasing environmental air pollution. **Analysis of Incorrect Options:** * **A. Cancer of the pancreas:** While highly lethal with a poor prognosis, it does not rank among the top five most common cancers globally. * **B. Buccal mucosa cancer:** This is a subset of Oral Cancer. While it is highly prevalent in **India** (due to tobacco and betel nut chewing), it is not the most common cancer on a global scale. * **D. Colo-rectal cancer:** This is the third most common cancer globally. While its incidence is rising due to dietary shifts and sedentary lifestyles, it still trails behind lung and breast cancer. **High-Yield Clinical Pearls for NEET-PG:** * **Global Scenario:** Most common cancer (Both sexes) = **Lung Cancer**. (Note: Breast cancer recently fluctuated with Lung for the #1 spot, but Lung remains the most common cause of *death*). * **Indian Scenario:** Most common cancer (Both sexes) = **Breast Cancer**. * **Indian Males:** Most common cancer = **Lip/Oral Cavity** (specifically Buccal Mucosa). * **Indian Females:** Most common cancer = **Breast Cancer** (followed by Cervix). * **Global Mortality:** Lung cancer is the #1 killer among all cancers.

Q: Which of the following is NOT a measurement used for the assessment of obesity?

Sullivan's index. ### Explanation The correct answer is **D. Sullivan’s Index**. #### 1. Why Sullivan’s Index is the Correct Answer Sullivan’s index is a measure of **disability-free life expectancy**. It is calculated by subtracting the duration of disability/sickness from the total life expectancy. It is a key indicator of the **quality of life** and population health status, rather than a physical measurement of body fat or obesity. #### 2. Analysis of Incorrect Options (Obesity Indices) * **A. Quetelet’s Index:** This is the most common name for the **Body Mass Index (BMI)**. It is calculated as $Weight (kg) / Height (m^2)$. * **B. Broca Index:** A simple formula used to estimate ideal body weight. * *Formula:* $Height (cm) - 100$. * Example: For a person 170 cm tall, the ideal weight is 70 kg. * **C. Corpulence Index (Ponderal Index):** Similar to BMI but uses the cube of the height. * *Formula:* $Weight (kg) / Height (m^3)$. It is often used in pediatrics to assess neonates. #### 3. High-Yield Clinical Pearls for NEET-PG * **Best indicator of abdominal obesity:** Waist-to-Hip Ratio (WHR). A ratio **>0.9 in men** and **>0.85 in women** indicates central obesity. * **Waist Circumference:** A high-yield predictor of metabolic risk. Action is needed if $>90$ cm in Indian men or $>80$ cm in Indian women. * **Skinfold Thickness:** Measured using **Harpenden Calipers** (most commonly at the triceps). * **Obesity Classification (WHO):** * Overweight: BMI 25–29.9 * Obese: BMI $\geq 30$ * *Note:* For Asians/Indians, the cutoff for overweight is lower ($\geq 23$) and obesity is $\geq 25$.

Q: What does STEPS stand for?

Noncommunicable diseases. **Explanation:** The **WHO STEPwise approach to Surveillance (STEPS)** is a standardized method for collecting, analyzing, and disseminating data on **Non-Communicable Diseases (NCDs)** and their risk factors. It was developed by the World Health Organization to help countries build and strengthen their surveillance systems to monitor the growing burden of chronic diseases. **Why Option B is Correct:** The STEPS framework is specifically designed to track the major risk factors that lead to NCDs (such as cardiovascular diseases, diabetes, and cancers). It focuses on three "steps" of data collection: * **Step 1:** Questionnaire-based (Self-reported data on tobacco/alcohol use, diet, and physical inactivity). * **Step 2:** Physical measurements (Blood pressure, height, weight, and waist circumference). * **Step 3:** Biochemical measurements (Blood glucose and cholesterol levels). **Why Other Options are Incorrect:** * **Option A:** Communicable diseases are monitored through different surveillance systems (like IDSP in India) that focus on pathogen detection, outbreak investigation, and immunization coverage, rather than lifestyle risk factors. * **Option C & D:** Since STEPS is a specialized tool exclusively for NCD risk factors, these options are incorrect. **High-Yield Clinical Pearls for NEET-PG:** * **Goal:** To provide a "stepwise" approach that is flexible enough for low- and middle-income countries to implement. * **Core Risk Factors:** STEPS monitors 8 core risk factors: Tobacco use, alcohol use, low fruit/vegetable intake, physical inactivity, obesity, raised BP, raised blood glucose, and abnormal blood lipids. * **Global Burden:** NCDs are currently the leading cause of death globally; hence, STEPS data is crucial for policy-making and the **National Programme for Prevention and Control of Cancer, Diabetes, Cardiovascular Diseases and Stroke (NPCDCS)**.

Question 1

The crude death rate is an indicator that shows the relationship between which two factors?

Accepted Answer

Population and total mortality

Answer

Population and proportional mortality

Answer

Population and age-specific mortality

Answer

None of the above

Question 2

What is the most common cause of epidemic infective hepatitis?

Accepted Answer

Hepatitis E Virus (HEV)

Answer

Hepatitis A Virus (HAV)

Answer

Hepatitis B Virus (HBV)

Answer

Hepatitis C Virus (HCV)

Question 3

Which disease is primarily associated with rats?

Accepted Answer

Leptospirosis

Answer

Measles

Answer

Tetanus

Answer

Influenza

Question 4

A measles epidemic can be anticipated when the proportion of susceptible children in a community reaches which percentage?

Accepted Answer

40%

Answer

20%

Answer

60%

Answer

80%

Question 5

According to national control programmes for non-communicable diseases, which of the following statements is FALSE?

Accepted Answer

According to the stroke control programme, the first priority is given to controlling diabetes, eliminating smoking, and preventing and managing other risk factors.

Answer

According to WHO, Coronary Heart disease is considered a modern epidemic, a disease that affects the population, and not an unavoidable attribute of aging.

Answer

Cancer is characterized by abnormal cell growth, the ability to invade adjacent tissues and distant organs, leading to the eventual death of the affected person if the tumor has progressed significantly. The DALYs lost worldwide due to cancer are 77.812.

Answer

Diabetes is an 'iceberg' disease. The increase in both prevalence and incidence of type 2 DM globally is associated with industrialization and socio-economic development.

Question 6

What is the most common cancer affecting both males and females globally?

Accepted Answer

Lung cancer

Answer

Cancer of the pancreas

Answer

Buccal mucosa cancer

Answer

Colo-rectal cancer

Question 7

Which of the following is NOT included in the syndromic approach to sexually transmitted diseases?

Accepted Answer

Dysuria in women

Answer

Genital ulcers

Answer

Urethral discharge in males

Answer

Vaginal discharge

Question 8

Which of the following is NOT a measurement used for the assessment of obesity?

Accepted Answer

Sullivan's index

Answer

Quetelet's index

Answer

Broca index

Answer

Corpulence index

Question 9

In the nineteenth century, McKeon studied the decline in the incidence of infectious diseases like tuberculosis and explained the correlation. The relation between the decline in infectious disease incidence and its causes is better understood in terms of what factors?

Accepted Answer

Social and economic factors

Answer

Increased awareness and knowledge

Answer

Behavioral interventions

Answer

Medical interventions

Question 10

What does STEPS stand for?

Accepted Answer

Noncommunicable diseases

Answer

Communicable diseases

Answer

Both

Answer

None

Non-Communicable Diseases — MCQs

Non-Communicable Diseases — MCQs

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