Non-Communicable Diseases Practice Questions

Q: All of the following is true regarding blindness except?

20% of blindness cases in India are due to cataract.. **Explanation:** The correct answer is **B** because the statement is factually incorrect. In India, **cataract** is not a minor contributor but the **leading cause of blindness**, accounting for approximately **66.2%** of cases (according to the National Blindness and Visual Impairment Survey 2015-2019), far exceeding the 20% mentioned in the option. **Analysis of other options:** * **Option A:** According to WHO estimates and the Global Burden of Disease, there are approximately **45 million** people living with blindness globally, making this a true statement. * **Option C:** As per the latest NPCB (National Programme for Control of Blindness) data, **Cataract (66.2%)** remains the most common cause of blindness in India, followed by refractive errors and glaucoma. * **Option D:** Under the NPCBVI (National Programme for Control of Blindness and Visual Impairment) and WHO criteria, blindness is defined as **visual acuity <3/60** (or Snellen equivalent) in the better eye with best possible correction. **High-Yield NEET-PG Pearls:** 1. **Definition Change:** India recently aligned its definition of blindness with the WHO: Visual acuity **<3/60** in the better eye (previously it was <6/60). 2. **Causes of Blindness in India (Ranked):** * Cataract (~66%) * Refractive Error (~18%) * Glaucoma (~5%) * Posterior Segment Disorders/Retinal diseases. 3. **Target:** The WHO "Vision 2020: The Right to Sight" initiative aimed to eliminate avoidable blindness. The current global target is to reduce the prevalence of vision impairment by 25% by 2019 (Integrated people-centered eye care).

Q: What is the ideal storage temperature for DPT vaccine?

2-8 °C. **Explanation:** The **DPT (Diphtheria, Pertussis, and Tetanus)** vaccine is a liquid-formulated, adsorbed vaccine. According to the Universal Immunization Programme (UIP) guidelines, it must be stored in the **Cold Chain** at a temperature of **+2°C to +8°C**. **Why 2-8 °C is the Correct Answer:** The DPT vaccine contains an aluminum adjuvant used to enhance the immune response. This formulation is highly **heat-sensitive** but, more importantly, **freeze-sensitive**. Maintaining the temperature between 2-8 °C ensures the potency of the toxoids and the pertussis component while preventing the vaccine from freezing. **Analysis of Incorrect Options:** * **Option A (Room Temperature):** DPT is heat-sensitive. Prolonged exposure to room temperature leads to the degradation of the pertussis component, significantly reducing its efficacy. * **Option C (0 to 20 °C):** This range is too broad and dangerous. If the temperature drops below 0°C, the vaccine freezes. Freezing causes the aluminum adjuvant to precipitate into crystals, which can cause sterile abscesses at the injection site and permanent loss of potency. **High-Yield Clinical Pearls for NEET-PG:** * **The Shake Test:** If you suspect a DPT (or TT/Hepatitis B) vial has been frozen, perform the "Shake Test." If the vaccine is damaged, it will show rapid sedimentation and large flakes compared to a non-frozen control vial. * **Storage Location:** In an ILR (Ice-Lined Refrigerator), DPT should be kept in the **top/middle basket**, never at the bottom (to avoid freezing). * **Sensitivity Hierarchy:** DPT is the **most freeze-sensitive** vaccine, while OPV is the **most heat-sensitive** vaccine. * **Open Vial Policy:** DPT can be used for up to 28 days after opening, provided it has been stored at 2-8 °C and the expiry date has not passed.

Q: What is the generation time for Mycobacterium leprae?

12-15 days. **Explanation:** The correct answer is **C. 12-15 days.** *Mycobacterium leprae*, the causative agent of Leprosy (Hansen’s disease), is characterized by being one of the slowest-growing bacteria known to infect humans. The **generation time** (the time required for a bacterial cell to divide into two) is exceptionally long, averaging **12 to 15 days**. This slow replication rate directly correlates with the long incubation period of the disease (average 3–5 years). **Analysis of Options:** * **A & B (8–12 days):** These durations are too short for *M. leprae*. While some mycobacteria like *M. tuberculosis* have a generation time of about 18–24 hours, *M. leprae* is significantly slower. * **D (15–20 days):** While *M. leprae* is slow, 15–20 days exceeds the standard physiological range cited in major textbooks (Park’s PSM) and microbiology references for its optimal doubling time. **High-Yield Clinical Pearls for NEET-PG:** * **Cultivability:** *M. leprae* cannot be grown on artificial culture media (it is an obligate intracellular parasite). It is traditionally grown in the **footpads of mice** or in the **nine-banded armadillo**. * **Temperature Preference:** It grows best at cooler temperatures (**30°C**), which explains its predilection for peripheral nerves, skin, and the anterior chamber of the eye. * **Staining:** It is an **acid-fast bacillus (AFB)**, but it is less acid-fast than *M. tuberculosis*. A **5% Sulfuric acid** (modified Ziehl-Neelsen) is used for staining instead of the standard 20% used for TB. * **Incubation Period:** Ranges from 6 months to 20 years (Average: 3–5 years). This is a frequent "match the following" topic in exams.

Q: Low birth weight (LBW) is associated with an increased risk of which of the following in adult life?

All of the above. This question tests your knowledge of the **Barker Hypothesis** (also known as the Fetal Origins of Adult Disease). ### Explanation The correct answer is **D (All of the above)**. According to the Barker Hypothesis, intrauterine growth restriction (IUGR) and low birth weight (LBW) lead to permanent physiological and metabolic changes in the fetus. This "fetal programming" occurs as an adaptation to a nutrient-poor environment, where the fetus prioritizes the development of vital organs (like the brain) at the expense of others (like the pancreas, kidneys, and skeletal muscle). * **Hypertension:** LBW is associated with a reduced number of nephrons in the kidneys. This leads to compensatory glomerular hypertrophy and increased systemic blood pressure in adulthood. * **Type 2 Diabetes Mellitus:** Poor fetal nutrition impairs the development of pancreatic beta cells and reduces insulin sensitivity in skeletal muscles, predisposing the individual to insulin resistance and T2DM later in life. * **Stroke and CAD:** The metabolic alterations (dyslipidemia and endothelial dysfunction) associated with LBW significantly increase the risk of atherosclerotic cardiovascular diseases, including stroke and coronary artery disease. ### High-Yield Clinical Pearls for NEET-PG * **Barker Hypothesis:** Proposes that the period of gestation is a critical window where environmental insults program the risk for chronic diseases in adulthood. * **Metabolic Syndrome:** LBW infants who experience "rapid catch-up growth" in early childhood are at the highest risk for obesity and metabolic syndrome. * **Thrifty Phenotype:** This is the specific term used to describe the fetus's ability to adapt to malnutrition by becoming "metabolically thrifty," which becomes maladaptive when nutrition becomes abundant postnatally. * **Other associated risks:** LBW is also linked to Chronic Obstructive Pulmonary Disease (COPD) and certain neurodevelopmental delays.

Q: What is the pH at which the initiation of dental caries begins?

5.2 - 5.5. ### Explanation **1. The Core Concept: Critical pH** Dental caries is a dynamic process of demineralization and remineralization. The "Critical pH" is the specific threshold below which the environment becomes acidic enough to cause the dissolution of tooth enamel (hydroxyapatite crystals). For dental enamel, this critical threshold is widely accepted as **5.2 to 5.5**. When oral bacteria (like *Streptococcus mutans*) ferment dietary carbohydrates, they produce organic acids. Once the plaque pH drops into this 5.2–5.5 range, the saliva and plaque fluid become undersaturated with calcium and phosphate ions, leading to the initiation of enamel demineralization. **2. Analysis of Options** * **Option B (5.2 - 5.5): Correct.** This is the physiological threshold where the rate of mineral loss exceeds the rate of mineral gain in enamel. * **Options A, C, and D:** These values represent significantly more acidic environments. While demineralization occurs much faster at a pH of 4.5 or 3.5, these are not the *initiation* points. By the time the pH reaches 4.5, significant damage is already underway. Note: For **root dentin**, the critical pH is higher (~6.2 to 6.7), making roots more susceptible to decay than enamel. **3. High-Yield Clinical Pearls for NEET-PG** * **Stephan Curve:** The graph depicting the rapid drop and gradual recovery of plaque pH after glucose exposure. * **Vipeholm Study:** Established the link between the *frequency* of sugar intake and caries risk (more important than the total amount). * **Fluoride’s Role:** Fluoride lowers the critical pH to approximately **4.5** by forming fluorapatite, which is more resistant to acid dissolution. * **Saliva:** Acts as a natural buffer (bicarbonate system) to raise the pH back above the 5.5 threshold.

Q: What is the type of Diphtheria associated with the highest mortality?

Laryngeal. ### Explanation **Correct Answer: C. Laryngeal** **Why Laryngeal Diphtheria has the highest mortality:** Laryngeal diphtheria is considered the most dangerous form because it carries a high risk of **acute airway obstruction**. The characteristic "pseudomembrane" (composed of fibrin, WBCs, and dead epithelial cells) can detach or cause significant edema in the narrow subglottic region. This leads to "croupy" cough, inspiratory stridor, and ultimately, asphyxiation. Unlike other forms, the primary cause of death here is often mechanical respiratory failure rather than just systemic toxemia. **Analysis of Incorrect Options:** * **A. Pharyngeal:** This is the **most common** clinical form. While it causes significant systemic toxemia (leading to myocarditis), the risk of immediate mechanical airway death is lower than in the laryngeal type. * **B. Nasal:** This is generally the **mildest** form. It presents with serosanguinous discharge and has low systemic toxin absorption, leading to a very low mortality rate. * **D. Conjunctival:** This is a rare localized form. While it can cause local tissue destruction and corneal scarring, it is rarely fatal. **High-Yield Clinical Pearls for NEET-PG:** * **Causative Agent:** *Corynebacterium diphtheriae* (Gram-positive, club-shaped, Chinese-letter pattern). * **Most Common Site:** Faucial/Pharyngeal. * **Most Fatal Site:** Laryngeal (due to asphyxia). * **The Membrane:** It is a **true pseudomembrane**; attempting to scrape it off results in profuse bleeding. * **Complications:** The most common cause of late death in diphtheria is **Myocarditis** (due to exotoxin). * **Schick Test:** Used to demonstrate the immune status of an individual (susceptibility). * **Drug of Choice:** Erythromycin (to stop toxin production) + Diphtheria Antitoxin (to neutralize circulating toxin).

Question 1

All of the following is true regarding blindness except?

Accepted Answer

20% of blindness cases in India are due to cataract.

Answer

There are an estimated 45 million people blind worldwide.

Answer

The most common cause of blindness in India is cataract.

Answer

Visual acuity less than 3/60 is considered blindness.

Question 2

Which one of the following is not associated with an increased risk of cancer?

Accepted Answer

Excess fibre

Answer

Smoking

Answer

Alcohol

Answer

Chewing betel

Question 3

According to the Integrated Management of Childhood Illness (IMNCI) guidelines, how is pneumonia classified?

Accepted Answer

Chest indrawing

Answer

Fast breathing

Answer

Wheezing

Answer

Fever

Question 4

What is the ideal storage temperature for DPT vaccine?

Accepted Answer

2-8 °C

Answer

Room temperature

Answer

0 to 20 °C

Answer

None of the above

Question 5

What is the generation time for Mycobacterium leprae?

Accepted Answer

12-15 days

Answer

8-10 days

Answer

10-12 days

Answer

15-20 days

Question 6

Low birth weight (LBW) is associated with an increased risk of which of the following in adult life?

Accepted Answer

All of the above

Answer

Hypertension

Answer

Stroke

Answer

Type 2 Diabetes Mellitus

Question 7

What is the pH at which the initiation of dental caries begins?

Accepted Answer

5.2 - 5.5

Answer

4.3 - 4.5

Answer

4.9 - 5.1

Answer

3.5 - 4.5

Question 8

A 61-year-old woman, who is 5 feet, 3 inches tall and weighs 125 pounds (57 kg), reports consuming a glass of wine two to three times a week. She works as a postal worker and has a 5-mile mail-delivery route. This is her first contact with the healthcare system in 20 years. Which of the following topics should the nurse plan to include in patient teaching about cancer prevention?

Accepted Answer

Alcohol use, physical activity, body weight, and colorectal screening

Answer

Alcohol use, physical activity, body weight, and tobacco use

Answer

Alcohol use, tobacco use, body weight, and colorectal screening

Answer

Physical activity, tobacco use, body weight, and colorectal screening

Question 9

What is the type of Diphtheria associated with the highest mortality?

Accepted Answer

Laryngeal

Answer

Pharyngeal

Answer

Nasal

Answer

Conjunctival

Question 10

What is the desired parameter for the control of hypertension?

Accepted Answer

Cholesterol/HDL ratio < 3.5

Answer

HDL/Cholesterol ratio < 3.5

Answer

LDL/Cholesterol ratio > 10 mg%

Answer

HDL < 30 mg%

Non-Communicable Diseases — MCQs

Non-Communicable Diseases — MCQs

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