Non-Communicable Diseases Practice Questions

Q: As per the Revised National Tuberculosis Control Programme (RNTCP) Category-1 guidelines, what is the drug regimen?

Four drugs for two months and two drugs for four months. **Explanation:** Under the **Revised National Tuberculosis Control Programme (RNTCP)**, now integrated into the **National TB Elimination Programme (NTEP)**, Category-1 is indicated for new cases of tuberculosis (both pulmonary and extra-pulmonary). **1. Why Option A is correct:** The standard regimen for Category-1 consists of two phases: * **Intensive Phase (IP):** 2 months of four drugs—**HRZE** (Isoniazid, Rifampicin, Pyrazinamide, and Ethambutol). * **Continuation Phase (CP):** 4 months of two drugs—**HR** (Isoniazid and Rifampicin). The goal of the IP is to rapidly kill the bacterial load, while the CP eliminates semi-dormant bacilli to prevent relapse. **2. Why other options are incorrect:** * **Option B:** Three drugs are insufficient for the Intensive Phase in new cases; Ethambutol is essential to prevent resistance. * **Option C:** Category-1 is strictly for **New Cases**. Retreatment cases (Relapse, Treatment after default, Failure) were previously classified under Category-2 (which has since been phased out in favor of Universal Drug Susceptibility Testing). * **Option D:** While the program has transitioned to a **Daily Regimen**, the question specifically asks for the "drug regimen" (composition and duration). In the context of traditional RNTCP MCQ patterns, Option A defines the core pharmacological structure of Category-1. **High-Yield Clinical Pearls for NEET-PG:** * **Dosage:** Fixed-Dose Combinations (FDCs) are used based on weight bands. * **Pyridoxine (Vitamin B6):** Always co-administered (10–25 mg/day) to prevent Isoniazid-induced peripheral neuropathy. * **Extension:** There is no longer an extension of the Intensive Phase if the sputum is positive at 2 months; instead, the patient proceeds to CP and undergoes DST. * **CP Duration:** In cases of TB Meningitis or Bone/Joint TB, the CP may be extended to 7–10 months.

Q: Which of the following statements is NOT true regarding the Ponderal Index?

It is height and weight independent.. ### Explanation The **Ponderal Index (PI)**, also known as the Rohrer's Index, is a measure used to assess body composition and nutritional status. It is calculated using the formula: **PI = Weight (kg) / Height³ (m³)** #### Why Option B is the Correct Answer (The "Not True" Statement) The Ponderal Index is **mathematically derived from height and weight**. Therefore, stating that it is "height and weight independent" is factually incorrect. Unlike the Body Mass Index (BMI = kg/m²), which is often used for adults, the PI is particularly useful in pediatrics and neonatology because it accounts for the fact that body proportions change as a person grows taller. #### Analysis of Other Options * **Option A (Measure of obesity):** This is true. Like BMI, PI is used to categorize individuals as underweight, normal, or obese. In neonates, it helps distinguish between symmetric and asymmetric Intrauterine Growth Restriction (IUGR). * **Option C (Height and weight dependent):** This is true. The formula itself requires both parameters to calculate the index. * **Option D (Age independent):** This is true. One of the primary advantages of the Ponderal Index over other anthropometric measures is that it remains relatively stable across different age groups, making it a reliable tool for longitudinal growth assessment. #### High-Yield Clinical Pearls for NEET-PG * **Neonatal Significance:** A low Ponderal Index in a newborn suggests **asymmetric IUGR** (wasting), where the weight is affected more than the length (e.g., due to placental insufficiency). * **PI vs. BMI:** While BMI is the gold standard for adult obesity screening, the Ponderal Index is considered more accurate for very short or very tall individuals because it follows the geometric scaling of a 3D object (mass vs. volume). * **Quetelet’s Index:** This is another name for BMI (Weight/Height²). Do not confuse it with the Ponderal Index.

Q: Which form of plague is the most contagious?

Pneumonic plague. **Explanation:** **Pneumonic plague** is the most contagious and lethal form of the disease. Unlike other forms, it is the only one that can be transmitted directly from **person-to-person via respiratory droplets** (aerosol transmission). It has a very short incubation period (1–3 days) and, if untreated, a case fatality rate approaching 100%. Its ability to spread rapidly through coughing makes it a significant public health threat and a potential bioterrorism agent. **Analysis of Incorrect Options:** * **Bubonic Plague:** The most common clinical form, characterized by painful lymph node swelling (buboes). It is transmitted via the **bite of an infected rat flea** (*Xenopsylla cheopis*). It is not directly contagious between humans unless there is contact with suppurating buboes. * **Septicemic Plague:** Occurs when the bacteria (*Yersinia pestis*) multiply in the bloodstream. It can be a primary infection or a complication of bubonic plague. While highly fatal, it is not contagious through respiratory routes. * **Wild Plague:** Also known as Sylvatic plague, this refers to the infection circulating in wild rodent populations (e.g., marmots, ground squirrels) rather than a specific clinical manifestation in humans. **High-Yield Clinical Pearls for NEET-PG:** * **Causative Agent:** *Yersinia pestis* (a Gram-negative coccobacillus showing characteristic **bipolar "safety-pin" staining**). * **Vector:** The Oriental rat flea (*Xenopsylla cheopis*) is the most efficient vector. * **Drug of Choice:** **Streptomycin** is the traditional DOC; Gentamicin and Doxycycline are effective alternatives. * **Chemoprophylaxis:** Doxycycline or Tetracycline is recommended for close contacts of pneumonic plague patients. * **Indicator:** A "Rat Fall" (sudden death of rats) is a precursor to a human bubonic plague outbreak.

Q: In an area not covered by measles immunization, what is the expected attack rate of measles?

90%. **Explanation:** The correct answer is **90%**. This question tests your knowledge of the **Secondary Attack Rate (SAR)** and the high infectivity of the Measles virus. **1. Why 90% is Correct:** Measles is one of the most highly contagious infectious diseases known to medicine. In a **virgin population** (an area where there is no natural immunity and no vaccination coverage), the virus spreads rapidly. The Secondary Attack Rate—defined as the probability that infection occurs among susceptible persons within a specific group (like a household or a community) following exposure to a primary case—is approximately **>90%**. This high percentage reflects the virus's efficient respiratory droplet transmission and its high $R_0$ (Basic Reproduction Number), which ranges between 12 and 18. **2. Why other options are incorrect:** * **70% and 80%:** These figures underestimate the extreme contagiousness of Measles. While these might be relevant for other childhood exanthematous illnesses (like Mumps or Rubella), they do not reflect the near-universal susceptibility of an unimmunized population to Measles. * **100%:** While the attack rate is exceptionally high, it is rarely 100% due to factors like subclinical infections, variations in host genetics, or the "luck of exposure" where a small fraction of the population may not receive an infectious dose. **3. NEET-PG High-Yield Pearls:** * **Secondary Attack Rate (SAR):** Measles (>90%) > Pertussis (80%) > Chickenpox (75%) > Mumps (30-40%). * **Herd Immunity Threshold:** For Measles, because it is so contagious, the herd immunity threshold is very high, requiring **94-95%** vaccination coverage to stop community transmission. * **Infectivity Period:** A patient is infectious from **4 days before to 4 days after** the appearance of the rash. * **Koplik’s Spots:** These are the pathognomonic enanthem appearing 1-2 days before the rash.

Q: Which of the following statements is NOT true regarding the Tuberculin test?

It is a specific test.. ### Explanation The Tuberculin Skin Test (TST), or Mantoux test, is a classic screening tool for latent TB infection. The correct answer is **Option C** because the Tuberculin test is **not a specific test**. **1. Why Option C is the correct answer (Why it is NOT true):** The TST lacks specificity due to cross-reactivity. A false-positive result can occur in individuals previously vaccinated with **BCG** or those infected with **Non-Tuberculous Mycobacteria (NTM)**. Because the Purified Protein Derivative (PPD) contains antigens shared by various mycobacterial species, it cannot distinguish between *M. tuberculosis* infection and other exposures. **2. Analysis of other options:** * **Option A:** In epidemiological surveys, the TST remains the standard tool for estimating the **Annual Risk of Tuberculous Infection (ARTI)** and the overall prevalence of infection in a community. * **Option B:** In the Indian context and for most general populations, an induration of **≥10 mm** is the standard cut-off for a positive result. (Note: ≥5 mm is used for HIV-positive or immunocompromised patients). * **Option D:** Tuberculin "reactors" (those with a positive test) represent the pool of latent infection. Statistically, the majority of new clinical cases of TB emerge from this pre-existing pool of reactors through endogenous reactivation. **High-Yield Clinical Pearls for NEET-PG:** * **Type of Hypersensitivity:** TST is a **Type IV (Delayed-type)** hypersensitivity reaction. * **Reading the Test:** Read results between **48–72 hours**. Measure only the **induration** (palpable hardening), not the erythema. * **False Negatives:** Can occur in miliary TB, malnutrition, HIV/AIDS (anergy), or recent viral infections like Measles. * **Alternative:** The **IGRA (Interferon-Gamma Release Assay)** is more specific than TST as it does not cross-react with the BCG vaccine.

Question 1

A patient with tubercular pleural effusion falls under which category of WHO grading of TB?

Accepted Answer

I

Answer

II

Answer

III

Answer

IV

Question 2

As per the Revised National Tuberculosis Control Programme (RNTCP) Category-1 guidelines, what is the drug regimen?

Accepted Answer

Four drugs for two months and two drugs for four months

Answer

Three drugs for two months and two drugs for four months

Answer

Includes retreatment cases

Answer

The regimen is given daily

Question 3

Which of the following statements is NOT true regarding the Ponderal Index?

Accepted Answer

It is height and weight independent.

Answer

It is a measure of obesity.

Answer

It is height and weight dependent.

Answer

It is age independent.

Question 4

Which form of plague is the most contagious?

Accepted Answer

Pneumonic plague

Answer

Bubonic plague

Answer

Septicemic plague

Answer

Wild plague

Question 5

In an area not covered by measles immunization, what is the expected attack rate of measles?

Accepted Answer

90%

Answer

70%

Answer

80%

Answer

100%

Question 6

According to the Revised National Tuberculosis Control Programme (RNTCP), a case of tubercular pericarditis should be treated under which category of anti-tubercular regimen?

Accepted Answer

Category I

Answer

Category II

Answer

Category III

Answer

Category IV

Question 7

All of the following are true regarding the acute attack of Polio, except?

Accepted Answer

Three consecutive stool samples are positive.

Answer

Fecal sample is carried in a cold box.

Answer

Investigation done within 48 hours.

Answer

Throat swab is taken for diagnosis.

Question 8

Which of the following statements is NOT true regarding the Tuberculin test?

Accepted Answer

It is a specific test.

Answer

It is the only tool available for estimating the prevalence of TB in a community.

Answer

An induration of 10 mm indicates a positive test.

Answer

New cases occur more commonly in patients who are tuberculin reactors.

Question 9

Diabetes mellitus is best diagnosed by which of the following criteria?

Accepted Answer

Fasting blood sugar > 126 mg/dL and postprandial blood sugar > 199 mg/dL

Answer

Fasting blood sugar > 100 mg/dL and postprandial blood sugar > 140 mg/dL

Answer

HbA1C = 5.5%

Answer

Fasting blood sugar > 70 mg/dL

Question 10

Isolation is strictly recommended for which of the following conditions?

Accepted Answer

Pneumonic plague

Answer

HIV

Answer

Measles

Answer

Brucellosis

Non-Communicable Diseases — MCQs

Non-Communicable Diseases — MCQs

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