Non-Communicable Diseases Practice Questions

Q: Cholera is transmitted by which of the following?

Contaminated food or water. **Explanation:** **Cholera** is an acute diarrheal infection caused by the ingestion of the bacterium *Vibrio cholerae*. **1. Why Option A is Correct:** The primary mode of transmission for Cholera is the **fecal-oral route**. This occurs most commonly through the consumption of **contaminated water** or **contaminated food** (especially raw or undercooked shellfish and vegetables grown with sewage water). In endemic areas, water is the most frequent vehicle, while food-borne outbreaks are common in non-endemic regions. **2. Why Other Options are Incorrect:** * **Option B:** Current oral cholera vaccines (OCVs) like Shanchol or Euvichol provide approximately **60–80% protection**, not 90%. Protection also diminishes significantly after 2–3 years. * **Option C:** In Cholera, **"Healthy carriers" are rare**. The transmission is primarily driven by "Incubatory" or "Convalescent" carriers, and more importantly, by subclinical cases (cases that are mild but still shed the bacteria). * **Option D:** **Chlorination is highly effective** against *Vibrio cholerae*. It is one of the standard public health interventions to ensure safe drinking water during outbreaks. **High-Yield Clinical Pearls for NEET-PG:** * **Rice Water Stools:** The hallmark clinical sign (non-sticky, colorless with flakes of mucus). * **Haldane’s Rule:** "Cholera is a disease of the poor; it begins where the law of hygiene ends." * **Incubation Period:** Very short, ranging from a few hours to 5 days (usually 1–2 days). * **Treatment of Choice:** Prompt **Rehydration** (ORS/IV fluids). Doxycycline is the drug of choice for reducing the duration of shedding in adults. * **Epidemiology:** Serogroups **O1** (Classical and El Tor biotypes) and **O139** are the main causes of epidemics. Currently, the 7th pandemic (El Tor) is ongoing.

Q: What is the duration that defines a permanent carrier for Hepatitis B Virus (HBV)?

More than 6 months. **Explanation:** The definition of a **chronic or permanent carrier** of Hepatitis B is based on the persistence of the **Hepatitis B surface Antigen (HBsAg)** in the blood for a specific duration. **1. Why Option A is Correct:** According to the World Health Organization (WHO) and standard epidemiological guidelines, a person is classified as a chronic carrier if HBsAg persists in the serum for **more than 6 months**. This duration is clinically significant because most acute HBV infections in adults resolve within 6 months. Persistence beyond this window indicates that the immune system has failed to clear the virus, leading to a chronic infection state. **2. Why Other Options are Incorrect:** * **Option B (1 month):** This represents the acute phase of infection. Many patients are HBsAg positive during the incubation and early symptomatic period but go on to clear the virus spontaneously. * **Options C & D (1 year / 2 years):** While a carrier will remain positive for these durations, the formal medical definition for "chronic" status is established much earlier (at the 6-month mark) to initiate monitoring for complications like cirrhosis or hepatocellular carcinoma. **3. High-Yield Clinical Pearls for NEET-PG:** * **Age Factor:** The risk of becoming a carrier is inversely proportional to age. Approximately **90% of infected newborns** become chronic carriers, compared to only **5–10% of infected adults**. * **Infectivity Marker:** While HBsAg defines the carrier state, **HBeAg** (Envelope Antigen) is the marker of high infectivity and active viral replication. * **Super-carrier:** A "super-carrier" is a person who is both HBsAg positive and HBeAg positive, possessing a very high viral load. * **Healthy Carrier:** Defined as HBsAg positive for >6 months but with normal ALT levels and low/undetectable HBV DNA.

Q: Which of the following is a second-generation Intrauterine Device (IUD)?

CuT-200. **Explanation:** Intrauterine Devices (IUDs) are classified into three generations based on their composition and mechanism of action. Understanding this classification is high-yield for NEET-PG. **Why CuT-200 is correct:** **CuT-200** belongs to the **Second Generation IUDs**, which are characterized by the addition of **copper** to a plastic (polyethylene) frame. Copper acts as a spermicide by causing a local inflammatory response in the endometrium and altering cervical mucus. The "200" represents the surface area of copper in square millimeters. Other examples include CuT-380A, Multiload (MLCu-250/375), and Nova T. **Analysis of Incorrect Options:** * **Lippes Loop (Option D):** This is a **First Generation IUD**. These are non-medicated, inert devices usually made of polyethylene or stainless steel. They are rarely used today due to higher expulsion and failure rates. * **Progestasert and Mirena (Options A & B):** These are **Third Generation IUDs** (Hormone-releasing IUDs). * **Progestasert** releases Progesterone (first-generation hormonal IUD). * **Mirena** (LNG-20) releases Levonorgestrel and is the most commonly used hormonal IUD today. **Clinical Pearls for NEET-PG:** * **Ideal Candidate:** Multiparous women in a stable monogamous relationship. * **Mechanism of Action:** Primarily prevents fertilization by being gametotoxic (especially copper IUDs). * **Most Common Side Effect:** Excessive menstrual bleeding (menorrhagia) is the #1 reason for removal. * **Most Common Complication:** Pain. * **CuT-380A:** Currently the most effective copper IUD with a lifespan of **10 years**.

Q: Which of the following is NOT an epidemiological feature of Japanese encephalitis?

Pigs can show clinical manifestations.. **Explanation:** Japanese Encephalitis (JE) is a zoonotic viral infection caused by a Group B Arbovirus (Flavivirus) and transmitted primarily by *Culex tritaeniorhynchus* mosquitoes. **Why Option C is the correct answer:** In the transmission cycle of JE, **pigs act as the "Amplifier Host."** While the virus multiplies rapidly in pigs, leading to high-titre viremia (which infects mosquitoes), the infection in pigs is **asymptomatic**. They do not show clinical manifestations of encephalitis. This makes them the perfect reservoir for maintaining the virus in the environment without dying off. **Analysis of other options:** * **Option A (Extra-human hosts):** JE is a zoonotic disease. The natural cycle involves extra-human hosts, primarily **Ardeid birds** (herons, egrets) as the natural reservoir and **pigs** as the amplifier host. * **Option B (Man is an incidental host):** Humans are "dead-end" hosts. Because the level of viremia in humans is low and transient, a mosquito biting an infected human cannot pick up enough virus to infect another person. * **Option D (Epidemics in Karnataka):** JE is endemic in several parts of India. Major outbreaks have been historically reported in states like Uttar Pradesh, Bihar, West Bengal, Assam, and South Indian states including **Karnataka** (especially the Bellary and Kolar districts) and Andhra Pradesh. **High-Yield NEET-PG Pearls:** * **Vector:** *Culex tritaeniorhynchus* (breeds in stagnant water/paddy fields). * **Reservoir/Maintenance Host:** Ardeid birds. * **Amplifier Host:** Pigs (Ratio of 1:1000—one infected pig can infect a thousand mosquitoes). * **Dead-end Hosts:** Humans and Horses. * **Vaccine:** Live attenuated **SA-14-14-2** (most common in India) or killed mouse brain-derived (Nakayama strain).

Q: Which virus is documented to cause fetal damage?

Varicella. **Explanation:** The correct answer is **Varicella (B)**. **Why Varicella is correct:** Varicella-Zoster Virus (VZV) is a well-documented teratogen. When a pregnant woman contracts primary varicella (chickenpox) during the first 20 weeks of gestation, the virus can cross the placenta and cause **Congenital Varicella Syndrome**. This syndrome is characterized by skin scarring (cicatricial lesions in a dermatomal distribution), limb hypoplasia, microcephaly, chorioretinitis, and cataracts. **Why the other options are incorrect:** * **Hepatitis A (A):** This is an enterically transmitted virus (fecal-oral). While it can cause acute hepatitis in the mother, it is not associated with congenital malformations or direct fetal damage. * **Measles (C):** While measles infection during pregnancy is associated with adverse outcomes like spontaneous abortion, premature labor, and low birth weight, it is **not** documented to be teratogenic (it does not cause structural fetal malformations). * **Arbovirus (D):** Most arboviruses (like Dengue or West Nile) do not typically cause fetal damage. *Note:* While Zika virus (an arbovirus) is a known teratogen, it is not the standard answer in this classic MCQ context compared to the established risk of Varicella. **NEET-PG High-Yield Pearls:** * **Congenital Rubella Syndrome (CRS):** The most common viral cause of fetal damage (Classic triad: Cataract, Deafness, Cardiac defects like PDA). * **Cytomegalovirus (CMV):** The most common *infectious* cause of sensorineural hearing loss and mental retardation in neonates. * **Varicella Prophylaxis:** If a susceptible pregnant woman is exposed to VZV, **Varicella-Zoster Immunoglobulin (VZIG)** should be administered within 96 hours to prevent maternal and fetal complications.

Q: The calendar method for contraception was described by whom?

Ogino. **Explanation:** The **Calendar Method** (also known as the Rhythm Method) is a natural family planning technique based on the physiological timing of ovulation. It was independently described by **Kyusaku Ogino** (Japan) and **Hermann Knaus** (Austria) in the 1920s. Therefore, it is often referred to as the **Ogino-Knaus Method**. **Why the correct answer is right:** * **Ogino (B):** Dr. Kyusaku Ogino discovered that ovulation occurs approximately 14 days before the next menstrual period. By calculating the shortest and longest cycles over 6–12 months, a woman can estimate her "fertile window" (abstaining from intercourse during this time to prevent pregnancy). **Why the incorrect options are wrong:** * **Bitings (A):** This is a distractor; there is no significant contributor to contraception by this name. (Note: "Billings" refers to the Cervical Mucus Method, which is a different natural method). * **Wallace (C):** Most commonly associated with the "Rule of Nines" used in assessing the percentage of Body Surface Area (BSA) in burn patients. * **Ogive (D):** This is a statistical term referring to a cumulative frequency polygon, used in epidemiology and biostatistics, not contraception. **High-Yield Clinical Pearls for NEET-PG:** * **Calculation Formula:** To find the fertile period, subtract 18 days from the shortest cycle (start of fertile period) and 11 days from the longest cycle (end of fertile period). * **Pearl Index:** The failure rate of the calendar method is relatively high (approx. 9–25 per 100 woman-years), making it less reliable than hormonal or barrier methods. * **Prerequisite:** It is only suitable for women with regular menstrual cycles. * **Standard Days Method (SDM):** A simplified version of the calendar method for women with cycles between 26–32 days, where days 8–19 are considered fertile.

Q: Which of the following is NOT a demographic process?

Morbidity. **Explanation:** Demography is the scientific study of human populations, primarily focusing on their size, structure, and development. The dynamics of a population are governed by five key **demographic processes** that lead to changes in population size and distribution. **Why Morbidity is the correct answer:** **Morbidity** refers to the state of being ill or the occurrence of disease within a population. While morbidity is a crucial indicator in public health and epidemiology, it is **not** considered a demographic process because the mere occurrence of illness does not, by itself, change the size or structure of a population. Only when a disease leads to death (Mortality) does it affect demographic dynamics. **Analysis of Incorrect Options:** * **Fertility (A):** This is the actual reproductive performance of a population. It is a primary demographic process as it adds new members to the population. * **Mortality (C):** This refers to the occurrence of deaths. It is a vital demographic process as it removes members from the population. * **Social Mobility (D):** This refers to the movement of individuals or groups between different social strata (e.g., change in socio-economic status). Along with **Migration** (spatial movement) and **Marriage**, it is classified as a demographic process because it alters the composition and structure of the population. **High-Yield Pearls for NEET-PG:** * **The 5 Demographic Processes:** Fertility, Mortality, Marriage, Migration, and Social Mobility. * **Demographic Cycle:** Remember the stages (High stationary to Declining). India is currently in **Late Expanding (Stage 3)**. * **Vital Statistics:** These are derived from the registration of "Vital Events" (Births, Deaths, Marriages, Divorces). * **Morbidity Indicators:** Measured by Incidence and Prevalence; these are tools of Epidemiology, not the primary drivers of Demography.

Question 1

Which of the following statements regarding dengue fever is false?

Accepted Answer

Affected by ambient temperature in the last 30 years in India.

Answer

It is both endemic and epidemic.

Answer

It is a mosquito-borne arboviral disease.

Answer

It is self-limiting.

Question 2

Cholera is transmitted by which of the following?

Accepted Answer

Contaminated food or water

Answer

Vaccination provides 90% efficiency

Answer

Healthy carriers

Answer

Chlorination is not effective

Question 3

What is the duration that defines a permanent carrier for Hepatitis B Virus (HBV)?

Accepted Answer

More than 6 months

Answer

More than 1 month

Answer

More than 1 year

Answer

More than 2 years

Question 4

Which of the following is a method of natural family planning?

Accepted Answer

Basal Body Temperature (BBT) charting

Answer

Abstinence

Answer

Coitus interruptus

Answer

Rhythm method (safe period)

Question 5

Which of the following is a second-generation Intrauterine Device (IUD)?

Accepted Answer

CuT-200

Answer

Progestasert

Answer

Mirena

Answer

Lippes Loop

Question 6

Which of the following is NOT an epidemiological feature of Japanese encephalitis?

Accepted Answer

Pigs can show clinical manifestations.

Answer

The virus infects extra-human hosts.

Answer

Man is an incidental host.

Answer

Epidemics have been reported in Karnataka.

Question 7

Which virus is documented to cause fetal damage?

Accepted Answer

Varicella

Answer

Hepatitis A

Answer

Measles

Answer

Arbovirus

Question 8

The calendar method for contraception was described by whom?

Accepted Answer

Ogino

Answer

Bitings

Answer

Wallace

Answer

Ogive

Question 9

Which of the following is NOT a demographic process?

Accepted Answer

Morbidity

Answer

Fertility

Answer

Mortality

Answer

Social mobility

Question 10

Which of the following is NOT a risk factor for the development of Diabetes Mellitus?

Accepted Answer

High intake of vitamin A

Answer

Obesity

Answer

Sedentary lifestyle

Answer

Excess fat intake

Non-Communicable Diseases — MCQs

Non-Communicable Diseases — MCQs

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