Non-Communicable Diseases Practice Questions

Q: How can the rash of chickenpox be differentiated from the rash of smallpox?

Deep seated. The differentiation between Chickenpox (Varicella) and Smallpox (Variola) is a classic high-yield topic in Community Medicine. The key lies in the depth and evolution of the skin lesions. **Explanation of the Correct Answer:** * **Deep-seated (C):** Smallpox rashes are characteristically **deep-seated and firm** (often described as "shotty" to the touch) because the virus affects the deeper layers of the dermis. In contrast, Chickenpox rashes are **superficial** and thin-walled, often described as "dewdrops on a rose petal." **Analysis of Incorrect Options:** * **Pleomorphic (A):** This is a hallmark of **Chickenpox**, not Smallpox. Pleomorphism means that all stages of the rash (papules, vesicles, and crusts) are visible simultaneously in the same area. In Smallpox, the rash is "monomorphic" (all lesions in one area are at the same stage of development). * **Centripetal (B):** This describes the distribution of **Chickenpox**, where the rash is most dense on the trunk and sparse on the extremities (it "flees the center"). Smallpox is **Centrifugal**, meaning it is most dense on the face and distal limbs (palms and soles are involved). * **Unilocular (D):** Smallpox vesicles are typically **multilocular** and umbilicated (having a central depression). If pricked, they do not collapse entirely. Chickenpox vesicles are **unilocular**; if pricked, the entire fluid escapes, and the vesicle collapses. **High-Yield Clinical Pearls for NEET-PG:** * **Incubation Period:** Smallpox (12 days) vs. Chickenpox (14–16 days). * **Fever:** In Smallpox, fever subsides with the onset of rash; in Chickenpox, fever rises with each fresh crop of rash. * **Axilla:** Smallpox typically spares the axilla, whereas Chickenpox often involves it. * **Eradication:** Smallpox was declared eradicated by the WHO on **May 8, 1980**.

Q: What is the composition of WHO Oral Rehydration Solution (ORS)?

Potassium - 20 mmol/L. The correct answer is **A. Potassium - 20 mmol/L**. ### **Explanation** The current standard for ORS is the **WHO Reduced Osmolarity ORS**, introduced in 2002 to reduce the need for intravenous fluids and decrease stool output compared to the older 1975 formula. 1. **Potassium (20 mmol/L):** This is the correct concentration of Potassium Chloride in the current WHO formula. Potassium replacement is vital during diarrhea to prevent hypokalemia, as significant amounts of potassium are lost in the stool. 2. **Sodium (75 mmol/L):** Option B is incorrect because the sodium concentration in Reduced Osmolarity ORS is **75 mmol/L**, not 90 mmol/L. The 90 mmol/L concentration was used in the older 1975 formula. 3. **Citrate vs. Bicarbonate:** Option C is incorrect. Modern ORS uses **Trisodium Citrate (10 mmol/L)** instead of Bicarbonate. Citrate is preferred because it is more stable in tropical climates and has a longer shelf life. 4. **Total Osmolality (245 mOsm/L):** Option D is incorrect. The total osmolality of the current ORS is **245 mOsm/L**. An osmolality of 150 mOsm/L would be too hypotonic. --- ### **High-Yield Facts for NEET-PG** * **Composition per Liter (Grams):** * Sodium Chloride: 2.6 g * Glucose (Anhydrous): 13.5 g * Potassium Chloride: 1.5 g * Trisodium Citrate: 2.9 g * **Composition (mmol/L):** Sodium (75), Chloride (65), Glucose (75), Potassium (20), Citrate (10). * **Glucose-Sodium Ratio:** The ratio is **1:1**, which optimizes the SGLT-1 receptor-mediated co-transport of sodium and water in the small intestine. * **Zinc Supplementation:** Always remember that ORS is supplemented with Zinc (20 mg/day for 14 days; 10 mg for infants <6 months) to reduce the duration and recurrence of diarrhea.

Q: What is the most appropriate test to assess the prevalence of tuberculosis infection in a community?

Tuberculin test. **Explanation:** The **Tuberculin Skin Test (TST/Mantoux test)** is the gold standard for estimating the **prevalence of tuberculosis infection** in a community. It measures delayed-type hypersensitivity to Purified Protein Derivative (PPD). It is important to distinguish between "infection" (presence of bacilli in the body without clinical disease) and "disease" (active clinical symptoms). TST identifies individuals who have been infected at some point, making it the primary tool for calculating the **Annual Risk of Tuberculosis Infection (ARTI)**. **Analysis of Options:** * **Mass Miniature Radiography (MMR):** While useful for screening large groups for lung abnormalities, it is non-specific, expensive, and carries radiation risks. It detects structural changes (disease) but cannot confirm infection status. * **Sputum Examination:** This is the "Gold Standard" for diagnosing **active pulmonary tuberculosis (case detection)** and monitoring treatment response. However, it only identifies infectious cases (smear-positive) and misses latent infections. * **Clinical Examination:** This is highly subjective and lacks the sensitivity or specificity required to estimate prevalence, as many infected individuals remain asymptomatic (latent TB). **High-Yield Facts for NEET-PG:** * **ARTI (Annual Risk of TB Infection):** The best indicator of the TB transmission trend in a community; it is derived from TST surveys in children. * **Prevalence of Disease:** Best measured by a combination of Chest X-ray and Sputum culture. * **Incidence of Disease:** Best measured by notification data or longitudinal cohort studies. * **Cut-off:** In India, an induration of **≥10 mm** after 48–72 hours is generally considered positive.

Q: Which of the following influenza virus types is NOT currently circulating in the world?

H5N1. **Explanation:** The question focuses on the distinction between **seasonal (human) influenza** viruses and **avian/zoonotic influenza** viruses. **Why H5N1 is the correct answer:** H5N1 is a highly pathogenic avian influenza (HPAI) virus. While it causes sporadic outbreaks in poultry and occasional "spillover" infections in humans, it has **not** achieved sustained human-to-human transmission. Therefore, it is not considered a "currently circulating" seasonal human influenza virus. In the context of public health surveillance, "circulating" refers to viruses regularly spreading within the human population. **Analysis of Incorrect Options:** * **H1N1:** This is a subtype of Influenza A. The A(H1N1)pdm09 strain has been circulating globally as a seasonal virus since the 2009 pandemic. * **H3N2:** This is another subtype of Influenza A that currently circulates globally among humans and often causes more severe seasonal epidemics compared to H1N1. * **Influenza B virus:** Unlike Influenza A, these are not divided into subtypes but into **lineages** (Victoria and Yamagata). Influenza B is a standard component of the seasonal flu burden in humans. **High-Yield NEET-PG Pearls:** 1. **Antigenic Shift vs. Drift:** Seasonal circulation is maintained by *Antigenic Drift* (point mutations). A pandemic occurs due to *Antigenic Shift* (genetic reassortment), which could potentially happen if a virus like H5N1 gains the ability for human-to-human spread. 2. **Current Seasonal Vaccine:** The WHO-recommended quadrivalent vaccine typically covers four strains: Influenza A (H1N1), Influenza A (H3N2), and two Influenza B lineages. 3. **Drug of Choice:** Oseltamivir (Neuraminidase inhibitor) remains the primary treatment for both seasonal and suspected avian influenza cases.

Q: A freshly prepared oral rehydration solution should not be used after how many hours?

24 hours. ### Explanation **Correct Answer: D. 24 hours** **Underlying Medical Concept:** Oral Rehydration Solution (ORS) is a non-sterile preparation containing glucose and electrolytes. Once the ORS powder is dissolved in water, it becomes a potential medium for bacterial growth, especially in tropical climates or unhygienic conditions. The glucose in the solution acts as a substrate for microorganisms. According to **WHO and UNICEF guidelines**, a freshly prepared ORS solution must be discarded after **24 hours** to prevent the risk of secondary bacterial contamination and potential worsening of diarrhea (iatrogenic gastroenteritis). **Analysis of Incorrect Options:** * **A, B, and C (4, 6, and 12 hours):** These timeframes are too short. While the solution is safest when used immediately, discarding it within 4–12 hours would lead to unnecessary wastage of resources, especially in community settings where access to clean water and ORS packets may be limited. The 24-hour mark is the standardized safety threshold. **High-Yield Clinical Pearls for NEET-PG:** * **Standard WHO ORS Composition (Reduced Osmolarity):** Sodium (75 mmol/L), Glucose (75 mmol/L), Chloride (65 mmol/L), Potassium (20 mmol/L), and Citrate (10 mmol/L). * **Total Osmolarity:** 245 mOsm/L (This is a frequent "image-based" or "value-based" question). * **Role of Citrate:** It increases the shelf life of the powder and helps in correcting acidosis. * **Zinc Supplementation:** Always used alongside ORS in pediatric diarrhea (20 mg/day for 14 days; 10 mg/day for infants <6 months) to reduce the duration and recurrence of episodes.

Q: At what age is the Rubella vaccine typically administered?

1 to 14 years. **Explanation:** The primary objective of Rubella vaccination in public health is to prevent **Congenital Rubella Syndrome (CRS)**. While Rubella is a mild viral illness in children, infection during early pregnancy can lead to devastating fetal complications, including cataracts, deafness, and cardiac defects. **Why Option A is correct:** Under the Universal Immunization Programme (UIP) in India, the **Measles-Rubella (MR) campaign** specifically targets children aged **9 months to 15 years** (effectively the 1–14 years age group). By vaccinating this cohort, the health system aims to build "herd immunity" and eliminate the virus from the community, thereby protecting pregnant women from exposure. In the routine schedule, the MR vaccine is given in two doses: the first at 9–12 months and the second at 16–24 months. **Why other options are incorrect:** * **Option B ( 50 years):** Rubella is primarily a childhood disease. By age 50, most individuals have either acquired natural immunity or are well past reproductive age, making vaccination at this stage irrelevant for preventing CRS. **High-Yield Clinical Pearls for NEET-PG:** * **Vaccine Type:** Live attenuated (RA 27/3 strain is most commonly used). * **Contraindication:** Pregnancy. Women should be advised to avoid pregnancy for **1 month** (previously 3 months) after receiving the vaccine. * **CRS Triad (Gregg’s Triad):** Cataract, Sensorineural hearing loss, and Congenital heart disease (Patent Ductus Arteriosus). * **Diagnostic Marker:** Presence of Rubella-specific IgM antibodies in a newborn is diagnostic of CRS.

Q: Which cycle is observed in RBCs during malaria?

Endogenous cycle. **Explanation:** The life cycle of the *Plasmodium* parasite is divided into two distinct phases based on the host: the **Endogenous cycle** (in humans) and the **Exogenous cycle** (in the female Anopheles mosquito). 1. **Why the Correct Answer is Right:** The **Endogenous cycle** occurs entirely within the human host. It consists of two main stages: * **Pre-erythrocytic (Exo-erythrocytic) Schizogony:** Occurs in the liver cells (hepatocytes). * **Erythrocytic Schizogony:** Occurs within the **Red Blood Cells (RBCs)**. Since the multiplication within RBCs happens inside the human body, it is a component of the endogenous cycle. 2. **Why the Other Options are Wrong:** * **Sexual Cycle:** This occurs in the mosquito (the definitive host). It begins with gametogony (initiated in humans but completed in mosquitoes) and ends with the formation of a zygote and ookinete. * **Sporogony:** This is the phase of asexual multiplication that occurs in the **mosquito**. It leads to the production of infective sporozoites. * **Exogenous Cycle:** This refers to the development of the parasite outside the human body (within the mosquito). It encompasses both the sexual cycle and sporogony. **High-Yield Clinical Pearls for NEET-PG:** * **Definitive Host:** Female Anopheles mosquito (where the sexual cycle occurs). * **Intermediate Host:** Humans (where the asexual/endogenous cycle occurs). * **Infective Form to Humans:** Sporozoites (injected via mosquito bite). * **Infective Form to Mosquito:** Gametocytes (ingested during a blood meal). * **Relapse vs. Recrudescence:** Relapse is caused by **hypnozoites** (latent liver forms) in *P. vivax* and *P. ovale*. Recrudescence is due to the persistence of blood forms in *P. falciparum*. * **Schüffner’s dots:** Characteristically seen in RBCs infected with *P. vivax* and *P. ovale*.

Q: Isolation is not indicated for measles because which of the following is true?

Incubatory carriers are present.. **Explanation:** The primary reason isolation is ineffective for measles is the presence of **incubatory carriers**. In measles, the period of maximum infectivity occurs during the **prodromal stage** (the 3-4 days before the rash appears), characterized by coryza, cough, and fever. By the time the characteristic rash appears and a clinical diagnosis is made, the patient has already been shedding the virus for several days, infecting susceptible contacts. Therefore, isolating the patient after the rash appears is "locking the stable door after the horse has bolted." **Analysis of Options:** * **A & B (Healthy and Convalescent Carriers):** These are **incorrect** because measles does not have a chronic or healthy carrier state. The virus is eliminated from the body after the acute phase; you are either acutely ill or immune. * **C (Low Infectivity):** This is **incorrect**. Measles is one of the most highly infectious diseases known, with a Secondary Attack Rate (SAR) exceeding 90% in susceptible populations. **High-Yield Facts for NEET-PG:** * **Infectivity Period:** 4 days before to 5 days after the appearance of the rash. * **Koplik’s Spots:** Pathognomonic feature occurring in the pre-eruptive stage (opposite the lower 2nd molar). * **Secondary Attack Rate (SAR):** >90% (highest among vaccine-preventable diseases). * **Isolation:** While not effective for community control, "source reduction" (early diagnosis and notification) remains a standard public health measure.

Question 1

How can the rash of chickenpox be differentiated from the rash of smallpox?

Accepted Answer

Deep seated

Answer

Pleomorphic

Answer

Centripetal

Answer

Unilocular

Question 2

What is the composition of WHO Oral Rehydration Solution (ORS)?

Accepted Answer

Potassium - 20 mmol/L

Answer

Sodium - 90 mmol/L

Answer

Bicarbonate - 10 mmol/L

Answer

Osmolality - 150 mmol/L

Question 3

What is the most appropriate test to assess the prevalence of tuberculosis infection in a community?

Accepted Answer

Tuberculin test

Answer

Mass miniature radiography

Answer

Sputum examination

Answer

Clinical examination

Question 4

Which of the following influenza virus types is NOT currently circulating in the world?

Accepted Answer

H5N1

Answer

H1N1

Answer

H3N2

Answer

Influenza B virus

Question 5

A freshly prepared oral rehydration solution should not be used after how many hours?

Accepted Answer

24 hours

Answer

4 hours

Answer

6 hours

Answer

12 hours

Question 6

A child was immunized at 6 months of age due to an epidemic of measles. What is the next recommended step for immunization?

Accepted Answer

Administer the vaccine as soon as the child completes 9 months of age.

Answer

Administer the vaccine after 4 weeks.

Answer

Administer the vaccine along with DPT.

Answer

No further action is needed.

Question 7

What is true about the national program for prevention and control of cancer, diabetes, cardiovascular diseases, and stroke?

Accepted Answer

Community Health Centers (CHCs) have facilities for the diagnosis and treatment of cardiovascular diseases and diabetes.

Answer

Home-based care is not provided.

Answer

Implementation is in 5 states over 10 districts.

Answer

There is a separate center for stroke and diabetes mellitus.

Question 8

At what age is the Rubella vaccine typically administered?

Accepted Answer

1 to 14 years

Answer

Less than 5 years

Answer

Greater than 50 years

Answer

None of the above

Question 9

Which cycle is observed in RBCs during malaria?

Accepted Answer

Endogenous cycle

Answer

Sexual cycle

Answer

Sporogony

Answer

Exogenous cycle

Question 10

Isolation is not indicated for measles because which of the following is true?

Accepted Answer

Incubatory carriers are present.

Answer

Healthy carriers are common.

Answer

Carriers are typically convalescents.

Answer

Infectivity in diseased individuals is low.

Non-Communicable Diseases — MCQs

Non-Communicable Diseases — MCQs

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