Non-Communicable Diseases — MCQs

Non-Communicable Diseases Indian Medical PG Practice Questions and MCQs

Question 311: Which of the following is NOT true regarding malaria?

A. Infant parasite rate is a poor indicator of malaria occurrence in a community. (Correct Answer)
B. Aberration (ABER) is used as an operational approach.
C. Spleen rate is an important indicator of the endemisity of malaria.
D. Malaria is usually caused by Plasmodium vivax.

Explanation: **Explanation:** **1. Why Option A is the Correct Answer (The "NOT True" Statement):** The **Infant Parasite Rate (IPR)** is actually considered the **most sensitive and best indicator** of malaria transmission in a community. Since infants (under 1 year) are generally less exposed and have no prior immunity, the presence of malaria parasites in their blood signifies **recent and ongoing transmission** within the locality. A zero IPR for three consecutive years is one of the criteria for declaring an area malaria-free. Therefore, stating it is a "poor indicator" is factually incorrect. **2. Analysis of Other Options:** * **Option B (ABER):** The **Annual Blood Examination Rate (ABER)** is indeed an operational indicator used to monitor the efficiency of the surveillance system. It measures the percentage of the population screened for malaria annually (a minimum of 10% is recommended). * **Option C (Spleen Rate):** Historically, the spleen rate (measured in children aged 2–9 years) has been a classic indicator used to determine the **endemicity** of malaria in a region before the widespread use of parasitological methods. * **Option D (Plasmodium vivax):** In the Indian context, *P. vivax* remains the most common cause of malaria, although the proportion of *P. falciparum* has been rising in certain regions. **High-Yield NEET-PG Pearls:** * **API (Annual Parasite Incidence):** The most important indicator for determining the **epidemiological situation** and planning control strategies. * **Formula for API:** (Total confirmed cases / Total population) × 1000. * **Slide Positivity Rate (SPR):** Total positive slides per 100 slides examined. * **Malaria Elimination Target (India):** The goal is to eliminate malaria by **2030**.

Question 312: Which of the following tests is NOT used for the diagnosis of leprosy?

A. Lepromin test (Correct Answer)
B. Slit skin smear
C. Fine needle aspiration cytology
D. Skin biopsy

Explanation: In leprosy management, it is crucial to distinguish between **diagnosis** and **prognosis**. **Why Option A (Lepromin Test) is the correct answer:** The Lepromin test is **not** a diagnostic test. It cannot confirm if a patient has leprosy because it is often negative in the most severe form (lepromatous leprosy) and can be positive in healthy individuals due to cross-reactivity with BCG or environmental mycobacteria. Instead, it is used for: 1. **Classification:** To categorize leprosy into Tuberculoid (Positive) or Lepromatous (Negative). 2. **Prognosis:** To assess the patient’s cell-mediated immunity (CMI) against *M. leprae*. 3. **Assessment of Resistance:** To check the immune status of an individual. **Why the other options are incorrect (Diagnostic Methods):** * **Slit Skin Smear (B):** The gold standard for identifying Acid-Fast Bacilli (AFB) using Ziehl-Neelsen staining. It is essential for calculating the Bacteriological Index (BI). * **Fine Needle Aspiration Cytology (C):** A reliable tool for sampling cells from enlarged nerves or skin nodules to identify granulomas and bacilli. * **Skin Biopsy (D):** The definitive method for histopathological confirmation, showing characteristic nerve involvement and granuloma patterns. **High-Yield Clinical Pearls for NEET-PG:** * **Cardinal Signs:** Diagnosis is primarily clinical based on: (1) Hypopigmented patches with sensory loss, (2) Thickened peripheral nerves, and (3) Positive skin smears. * **Fernandez Reaction:** Early reading of Lepromin test (at 48 hours); indicates delayed hypersensitivity. * **Mitsuda Reaction:** Late reading (at 21 days); indicates cell-mediated immunity. * **Ridley-Jopling Scale:** The standard 5-group classification system based on clinical, immunological, and histopathological features.

Question 313: What is the maximum time after exposure within which measles vaccine can be given?

A. 3 months
B. 5 months
C. 7 months
D. 6 months (Correct Answer)

Explanation: **Explanation:** The correct answer is **6 months (Option D)**. This question pertains to the **post-exposure prophylaxis (PEP)** and the window of opportunity for measles vaccination in individuals who have been exposed to the virus. **1. Why 6 months is correct:** According to the World Health Organization (WHO) and the National Immunization Schedule guidelines, the measles vaccine can be administered as post-exposure prophylaxis to susceptible individuals (those unvaccinated or without prior immunity). While the vaccine is most effective if given within **72 hours** of exposure to prevent or modify the disease course, it remains beneficial to vaccinate children as early as **6 months of age** during outbreaks or after known exposure. In standard practice, if a child is exposed before the scheduled 9-month dose, the "earliest" they can receive the vaccine is 6 months. This is known as the **"zero dose,"** which must be followed by the two scheduled doses at 9 and 15 months. **2. Why other options are incorrect:** * **A, B, and C (3, 5, and 7 months):** At 3 or 5 months, the presence of high levels of **maternally derived antibodies** (transplacental IgG) significantly interferes with the immune response to the live-attenuated measles vaccine, making it ineffective. While 7 months is technically possible, 6 months is the established clinical threshold for the earliest safe and effective administration during high-risk exposure scenarios. **3. High-Yield Clinical Pearls for NEET-PG:** * **Standard Schedule:** 1st dose at 9 completed months; 2nd dose at 16–24 months. * **Post-Exposure Window:** Vaccine within **72 hours**; Immunoglobulin (Ig) within **6 days**. * **Vitamin A:** Always co-administer with measles treatment (2 doses, 24 hours apart) to reduce mortality and ocular complications. * **Type of Vaccine:** Live attenuated (Edmonston-Zagreb strain is commonly used in India). * **Contraindication:** Pregnancy and severe immunosuppression (e.g., advanced AIDS).

Question 314: Which act is related to cigarette smoking?

A. Child abuse
B. Cigarette smoking (Correct Answer)
C. Consumer related
D. Cocaine

Explanation: **Explanation:** The question refers to the **COTPA (Cigarettes and Other Tobacco Products Act), 2003**. This is the primary legislation in India governing the trade, commerce, production, supply, and distribution of tobacco products. **1. Why the Correct Answer is Right:** The act specifically targets the regulation of **Cigarette smoking** and other tobacco products. Key provisions under COTPA include: * **Section 4:** Prohibition of smoking in public places. * **Section 5:** Prohibition of direct and indirect advertisement of tobacco products. * **Section 6:** Prohibition of sale to minors (under 18) and within 100 yards of educational institutions. * **Section 7:** Mandatory pictorial health warnings on all tobacco packs. **2. Why Incorrect Options are Wrong:** * **Child Abuse:** Governed primarily by the **POCSO Act** (Protection of Children from Sexual Offences Act, 2012) and the Juvenile Justice Act. * **Consumer Related:** Governed by the **Consumer Protection Act, 2019**, which protects consumers against unfair trade practices. * **Cocaine:** Regulated under the **NDPS Act** (Narcotic Drugs and Psychotropic Substances Act, 1985), which deals with the control and regulation of narcotic drugs. **High-Yield Facts for NEET-PG:** * **MPOWER Strategy:** Launched by WHO to monitor tobacco use and prevention policies. * **World No Tobacco Day:** Observed on **May 31st**. * **NTCP:** The National Tobacco Control Programme was launched in 2007-08 to facilitate the implementation of COTPA. * **GATS (Global Adult Tobacco Survey):** The key survey used to monitor tobacco prevalence in India.

Question 315: What is true about the Mantoux test?

A. A reaction less than 5 cm is always positive.
B. The test is usually negative after treatment.
C. A positive reaction in children less than 2 years old is less important than in adults.
D. The test is usually read after 48-72 hours. (Correct Answer)

Explanation: **Explanation:** The Mantoux test (Tuberculin Skin Test) is a classic example of a **Type IV (Delayed-type) Hypersensitivity reaction**. When Purified Protein Derivative (PPD) is injected intradermally, it triggers a T-cell mediated response. This reaction takes time to develop, peaking between **48 to 72 hours**, which is why the induration must be measured during this specific window. **Analysis of Options:** * **Option A is incorrect:** A reaction is measured in **millimeters (mm)**, not centimeters. Furthermore, a reaction <5 mm is generally considered negative. * **Option B is incorrect:** Once a person is sensitized to *M. tuberculosis*, the Mantoux test usually remains positive for life, even after successful treatment. It cannot be used to monitor treatment efficacy. * **Option C is incorrect:** A positive reaction in children under 5 years (especially <2 years) is of **greater clinical significance**. It indicates recent infection and a high risk of progression to severe forms like tubercular meningitis or miliary TB. * **Option D is correct:** This is the standard protocol for reading the induration (not erythema). **High-Yield NEET-PG Pearls:** * **Dose:** 0.1 ml of PPD containing 5 TU (Tuberculin Units) is injected intradermally on the volar aspect of the forearm. * **False Negatives (Anergy):** Can occur in HIV/AIDS (low CD4 count), miliary TB, malnutrition, or recent viral infections (e.g., Measles). * **False Positives:** Can occur due to prior BCG vaccination or infection with Non-Tuberculous Mycobacteria (NTM). * **Booster Phenomenon:** A second test done shortly after an initial negative test may be positive due to "re-awakening" of the immune memory.

Question 316: Which of the following statements is true about the epidemiology of leprosy?

A. A high prevalence of cases in childhood indicates that the disease is under control.
B. Lepra bacilli cannot survive outside the human body.
C. The bacterial load is high in the tuberculoid variety of leprosy.
D. Insects can transmit leprosy. (Correct Answer)

Explanation: ### **Explanation: Epidemiology of Leprosy** **Correct Answer: D. Insects can transmit leprosy.** **1. Why Option D is Correct:** While the primary mode of transmission for *Mycobacterium leprae* is through **droplet infection** (nasal discharge), mechanical transmission via insects has been documented. Studies have shown that **flies (*Musca domestica*)** and **bedbugs (*Cimex lectularius*)** can ingest the bacilli from skin ulcers or nasal secretions and potentially transmit them to others. Although not the major route, it remains a recognized epidemiological factor. **2. Why Other Options are Incorrect:** * **Option A:** A high prevalence of leprosy in **childhood** is actually a sensitive indicator of **active transmission** in the community. It suggests that the disease is *not* under control and that there are many undiagnosed infectious cases (open cases) in the environment. * **Option B:** *M. leprae* can survive outside the human body for varying periods. Research indicates the bacilli can remain viable in **moist soil** for up to 46 days and in **dried nasal secretions** for up to 7–9 days. * **Option C:** The bacterial load is high in **Lepromatous leprosy** (Multibacillary), which is characterized by low cell-mediated immunity (CMI). In **Tuberculoid leprosy** (Paucibacillary), the CMI is high, leading to very few or no detectable bacilli in skin smears. **3. High-Yield Clinical Pearls for NEET-PG:** * **Incubation Period:** Average 3–5 years (longest for any bacterial disease). * **Classification:** Ridley-Jopling is the most widely used clinical-pathological classification. * **Indicator of Control:** The "Case Detection Rate" is a better indicator of the current trend than "Prevalence Rate." * **Elimination Goal:** Defined by WHO as a prevalence of **<1 case per 10,000 population**. * **Reservoirs:** Humans are the main reservoir; however, **nine-banded armadillos** are known natural hosts in the Americas.

Question 317: Which of the following is the serogroup of Neisseria meningitidis that is primarily responsible for epidemic meningitis?

A. Serogroup W135 (Correct Answer)
B. Serogroup B
C. Serogroup C
D. Serogroup Y

Explanation: **Explanation:** The correct answer is **Serogroup W135**. While *Neisseria meningitidis* has several serogroups based on capsular polysaccharides, **Serogroup A** has historically been the most common cause of large-scale epidemics, particularly in the "Meningitis Belt" of Sub-Saharan Africa. However, in recent decades, **Serogroup W135** has emerged as a significant cause of major international outbreaks and epidemics, notably associated with Hajj pilgrimage travelers and subsequent global spread. **Analysis of Options:** * **Serogroup W135 (Correct):** It gained prominence after the 2000/2001 Hajj outbreaks. It is now recognized as a primary epidemic strain alongside Serogroup A and X. * **Serogroup B:** This is a major cause of **endemic** disease and sporadic cases in developed countries (Europe and North America). It is less likely to cause explosive epidemics because its polysaccharide capsule is poorly immunogenic. * **Serogroup C:** Often causes localized outbreaks in schools or military camps but is less frequently associated with large-scale continental epidemics compared to A or W135. * **Serogroup Y:** Primarily associated with sporadic cases of meningococcal pneumonia and is rarely the driver of major epidemics. **High-Yield Clinical Pearls for NEET-PG:** * **The Meningitis Belt:** Extends across Sub-Saharan Africa from Senegal to Ethiopia. * **Vaccination:** The Quadrivalent vaccine (**ACYW135**) is mandatory for Hajj pilgrims. * **Drug of Choice:** **Ceftriaxone** is the treatment of choice; **Rifampicin** (or Ciprofloxacin/Ceftriaxone) is used for chemoprophylaxis of close contacts. * **Most common serogroup in India:** Historically Serogroup A, though patterns are shifting.

Question 318: In a population, changing harmful lifestyles through education to prevent Coronary Artery Disease is referred to as which type of prevention?

A. High risk strategy
B. Primary prevention (Correct Answer)
C. Secondary prevention
D. Tertiary prevention

Explanation: **Explanation:** The core of this question lies in identifying the timing of the intervention. **Primary prevention** aims to prevent the onset of a disease by controlling its causes and risk factors. In the context of Coronary Artery Disease (CAD), changing harmful lifestyles (such as smoking cessation, physical activity, and healthy diet) through education is a classic example of **Specific Protection** and **Health Promotion**, both of which are modes of intervention under Primary Prevention. It is applied in the "Pre-pathogenesis" phase, where the goal is to reduce the incidence of disease. **Analysis of Incorrect Options:** * **A. High-risk strategy:** While this is a *sub-type* of primary prevention, it focuses only on individuals at the highest risk (e.g., those with existing hypertension). The question describes a general educational approach to change lifestyles, which aligns more broadly with the "Population Strategy" of Primary Prevention. * **C. Secondary prevention:** This involves early diagnosis and prompt treatment (e.g., screening for asymptomatic CAD or using Aspirin after a diagnosis) to arrest the disease process and prevent complications. * **D. Tertiary prevention:** This occurs in the late pathogenesis phase, focusing on disability limitation and rehabilitation (e.g., cardiac rehabilitation after a myocardial infarction). **NEET-PG High-Yield Pearls:** * **Primordial Prevention:** Prevention of the *emergence* of risk factors (e.g., discouraging children from starting smoking). If the risk factor is already present (as implied by "harmful lifestyles"), the intervention is Primary Prevention. * **Primary Prevention** = Reducing **Incidence**. * **Secondary Prevention** = Reducing **Prevalence** (by shortening disease duration through early treatment). * **Modes of Intervention for Primary Prevention:** Health Promotion and Specific Protection (e.g., Immunization).

Question 319: The last case of smallpox was reported in the world in which year?

A. 1977 (Correct Answer)
B. 1978
C. 1979
D. 1982

Explanation: **Explanation:** Smallpox (caused by the *Variola* virus) holds a significant place in public health history as the first disease to be eradicated globally. **Why Option A is Correct:** The last **naturally occurring** case of smallpox (*Variola minor*) was reported in **Ali Maow Maalin** in Merca, **Somalia**, on **October 26, 1977**. This date marks the definitive end of natural transmission of the virus in the human population. **Analysis of Incorrect Options:** * **Option B (1978):** This year is significant because the **last fatal case** of smallpox occurred due to a **laboratory accident** in Birmingham, UK (Janet Parker). It was not a naturally occurring case. * **Option C (1979):** On December 9, 1979, the Global Commission for the Certification of Smallpox Eradication signed the document certifying that smallpox had been eradicated worldwide. * **Option D (1982):** This date is irrelevant to smallpox milestones. The official declaration of eradication by the World Health Assembly (WHA) occurred earlier, in **May 1980**. **High-Yield Clinical Pearls for NEET-PG:** * **Last case in India:** Reported on May 24, 1975 (Bhanumati Bhattacharya in Bihar). * **India declared Smallpox free:** April 1977. * **Global Eradication Declaration:** May 8, 1980 (33rd WHA). * **Vaccine:** Smallpox vaccine was the first vaccine (Edward Jenner, 1796) and utilized the **Bifurcated needle**. * **Eradication Strategy:** Shifted from mass vaccination to **"Surveillance and Containment."**

Question 320: Waist-hip ratio below what value is associated with low cardiovascular morbidity in females?

A. 0.9
B. 1
C. 0.8 (Correct Answer)
D. 0.5

Explanation: **Explanation:** The **Waist-Hip Ratio (WHR)** is a critical anthropometric index used to measure abdominal (android) obesity, which is a significant risk factor for non-communicable diseases (NCDs) like Type 2 Diabetes and Cardiovascular Disease (CVD). **1. Why 0.8 is the Correct Answer:** According to the World Health Organization (WHO), a waist-hip ratio of **≤ 0.80 in females** and **≤ 0.90 in males** is considered the cutoff for low cardiovascular morbidity. Values above these thresholds indicate "central obesity," where fat is deposited around the intra-abdominal organs. This visceral fat is metabolically active and releases pro-inflammatory cytokines, leading to insulin resistance and atherosclerosis. **2. Analysis of Incorrect Options:** * **0.9 (Option A):** This is the cutoff value for **males**. In females, 0.9 already indicates a high risk for metabolic complications. * **1.0 (Option B):** A ratio of 1.0 or higher signifies a "bell-shaped" or "apple-shaped" body, representing a very high risk for myocardial infarction and stroke. * **0.5 (Option D):** This value is more relevant to the **Waist-to-Height Ratio (WHtR)**, where the general recommendation is to "keep your waist to less than half your height." **3. High-Yield Clinical Pearls for NEET-PG:** * **Apple vs. Pear:** Android (Apple) obesity carries a much higher CV risk than Gynoid (Pear) obesity. * **Waist Circumference Cutoffs (Asian Indians):** Due to higher visceral fat at lower BMIs, the cutoffs are stricter: **>90 cm for men** and **>80 cm for women**. * **Metabolic Syndrome:** WHR is a key component in various diagnostic criteria for Metabolic Syndrome (e.g., WHO criteria). * **Gold Standard:** While WHR is excellent for field surveys, **CT/MRI** remains the gold standard for measuring visceral fat.

Practice by Chapter

Epidemiology of NCDs

Practice Questions

Cardiovascular Disease Prevention

Practice Questions

Diabetes Control Program

Practice Questions

Cancer Screening and Control

Practice Questions

Chronic Respiratory Diseases

Practice Questions

Mental Health Program

Practice Questions

Blindness Control Program

Practice Questions

Accident and Injury Prevention

Practice Questions

NCD Risk Factor Surveillance

Practice Questions

National Program for Prevention and Control of Cancer, Diabetes, CVD, and Stroke

Practice Questions

Oral Health Program

Practice Questions

Geriatric Health Issues

Practice Questions

Want unlimited practice?

Get full access to all questions, explanations, and performance tracking.

Start For Free