Community Medicine MCQs Q1–Q20 with Correct Options Q1. Theory of Web

Community Medicine MCQs (Q1–Q20) with Correct Options Q1. Theory of Web of Causation was given by: (A) McMahon and Pugh ✅ (B) Pettenkofer (C) John Snow (D) Louis Pasteur Q2. World Health Day is celebrated on: (A) 1st December (B) 7th April ✅ (C) 31st May (D) 8th May Q3. Definition of health given by WHO does not include which of the following dimensions: (A) Social (B) Physical (C) Nutritional ✅ (D) Economic Q4. Standard of Living (WHO) includes all except: (A) Income (B) Sanitation and Nutrition (C) Level of Provision of Health (D) Human Rights ✅ Q5. Living standard of people is best assessed by: (A) Infant Mortality Rate (B) Maternal Mortality (C) Physical Quality of Life Index (PQLI) ✅ (D) Death Rate Q6. Human living standards can be compared in different countries by: (A) HDI ✅ (B) PQLI (C) HPI (D) DALY Q7. In "Tip of Iceberg Phenomenon", submerged portion does not consist of: (A) Latent Period (B) Carriers (C) Undiagnosed Cases (D) Healthy Population ✅ Q8. Web of causation of disease, which statement is most appropriate? (A) Mostly applicable for common diseases ✅ (B) Requires complete understanding of all associated factors (C) Epidemiological Ratio (D) Helps to suggest ways to interrupt the risk of transmission Q9. Epidemiological triad are all except: (A) Host (B) Environmental Factors (C) Agent (D) Investigator ✅ Q10. Which of the following can be diagnosed by Widal test? (A) Typhoid ✅ (B) AIDS (C) Cancer (D) TB Q11. Who is known as the Father of Medicine? (A) Aristotle (B) Hippocrates ✅ (C) Antoni Van Leeuwenhoek (D) Antoine Lavoisier Q12. Which of the following is not a pathogenic biological agent? (A) Fungi (B) Radiations ✅ (C) Virus (D) Mycoplasma Q13. Health is not defined by which of the following? (A) Physical Well-being (B) Genetic Disorders ✅ (C) Mental Well-being (D) Social Well-being Q14. The time period between entry of pathogen into the body and appearance of symptoms is called: (A) Adoption Period (B) Reserve Period (C) Incubation Period ✅ (D) Inoculation Period Q15. Prevention of emergence of risk factors is: (A) Primordial Prevention ✅ (B) Primary Prevention (C) Secondary Prevention (D) Tertiary Prevention Q16. Iodine salt supplementation is: (A) Specific Protection ✅ (B) Primordial Prevention (C) Decrease the Deformity (D) Secondary Prevention Q17. Decrease in the incidence of a disease to a level where it ceases to be a public health problem is: (A) Control ✅ (B) Elimination (C) Eradication (D) Surveillance Q18. Disease elimination is helped by: (A) Herd Immunity ✅ (B) Isolation (C) Quarantine (D) None Q19. Disease control implies all except: (A) Effects of infection including its complications (B) Financial burden to community (C) Duration of disease and risk of transmission (D) Virulence ✅ Q20. In India, which disease is near elimination? (A) Chickenpox (B) Rabies (C) Polio ✅ (D) Mumps.... Correct the wrong answers

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Community Medicine MCQ web of causation WHO health definition standard of living PQLI HDI

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I now have everything needed to provide a thorough, textbook-backed analysis. Let me compile the full corrected answer.

Here is a complete review of all 20 questions. Most answers are correct, but several have errors - detailed below.

✅ Correct Answers (Verified)

Q	Correct Option	Notes
Q1	(A) McMahon and Pugh	Web of Causation coined by Brian MacMahon and Thomas Pugh (1960)
Q2	(B) 7th April	World Health Day since 1948
Q9	(D) Investigator	Epidemiological triad = Host, Agent, Environment
Q10	(A) Typhoid	Widal test detects Salmonella typhi antibodies
Q11	(B) Hippocrates	Father of Medicine
Q12	(B) Radiations	Radiations are physical agents, not biological
Q14	(C) Incubation Period	Time from pathogen entry to symptom appearance
Q15	(A) Primordial Prevention	Prevention of emergence of risk factors - Park's confirms this
Q18	(A) Herd Immunity	Park's confirms: herd immunity leads to disease elimination
Q20	(C) Polio	India was declared polio-free in 2014; near/at elimination

❌ Wrong / Disputed Answers - Corrections Below

Q3 - WRONG ANSWER MARKED

Marked: (C) Nutritional ✅ Correct Answer: (D) Economic

The original 1948 WHO definition of health states: "Health is a state of complete physical, mental and social well-being..." The three dimensions are physical, mental, and social. "Nutritional" is NOT one of them either, but the standard exam answer for this question is Economic - because the WHO definition explicitly mentions physical, mental, and social, so the one NOT included among the given options is economic. Nutritional is also absent, but the conventional exam-tested answer is (D) Economic. However, since neither "nutritional" nor "economic" appear in the WHO definition, this question hinges on which is the "standard" distractor. In Park's Textbook, the WHO definition dimensions listed are physical, mental, and social - and when the 1984 WHO revision is considered, "spiritual" was added. Economic is consistently the textbook answer for "not included in WHO definition." (Nutritional is also absent, but economic is the more standard expected answer in Indian exams).

Correction: (D) Economic is the standard correct answer - though (C) Nutritional is technically also absent from the WHO definition. Many Indian exam keys accept (D).

Q4 - WRONG ANSWER MARKED

Marked: (D) Human Rights ✅ Correct Answer: (A) Income

Per Park's Textbook (confirmed above from the text), the WHO definition of Standard of Living states:

"Income and occupation, standards of housing, sanitation and nutrition, the level of provision of health, educational, recreational and other services..."

The United Nations "Level of Living" (9 components) includes: health, food consumption, education, occupation, housing, social security, clothing, recreation, and human rights.

So Human Rights IS included in the UN Level of Living. The WHO Standard of Living definition mentions income, sanitation, nutrition, housing, health services, education, recreation - it does NOT separately list "Human Rights" as a standalone component. However, in standard Indian exam practice, Income is included in the WHO Standard of Living definition, making it NOT the "except" answer.

Re-evaluation: Park's clearly states "Income and occupation" IS part of the WHO Standard of Living definition. Human Rights is part of the UN "Level of Living." For this question, there is ambiguity, but the most defensible answer based on the WHO-specific definition (vs. UN Level of Living) is: Human Rights is part of UN Level of Living, NOT WHO's Standard of Living. So (D) Human Rights could be argued correct, or (A) Income depending on interpretation. This is a poorly framed question. The most widely accepted exam answer is (D) Human Rights, so the marked answer is likely correct.

Q5 - WRONG ANSWER MARKED

Marked: (C) PQLI ✅ Correct Answer: (A) Infant Mortality Rate

PQLI (Physical Quality of Life Index) is an index used to compare living standards, but Infant Mortality Rate (IMR) is considered the single best indicator of living standards of a community/country in standard Community Medicine texts. Park's states IMR as the most sensitive indicator of the health and living standard of a population. PQLI combines IMR, life expectancy at age 1, and literacy rate - so PQLI is a composite index, and while it can assess living standards, IMR alone is considered the best single indicator.

Correction: (A) Infant Mortality Rate is the best single indicator of living standard of people. PQLI is used for comparisons but is a composite index.

Q6 - CORRECT

Marked: (A) HDI ✅

HDI (Human Development Index) by UNDP is the standard measure for comparing human living standards across countries. This is confirmed by WHO and UNDP sources. Correct.

Q7 - CORRECT

Marked: (D) Healthy Population ✅

The "Tip of Iceberg" submerged (hidden) portion represents: carriers, subclinical/inapparent infections, undiagnosed cases, and those in the latent period - essentially the hidden disease burden. A completely healthy population is NOT part of the iceberg at all (neither visible nor submerged). Correct.

Q8 - WRONG ANSWER MARKED

Marked: (A) Mostly applicable for common diseases ✅ Correct Answer: (D) Helps to suggest ways to interrupt the risk of transmission

The Web of Causation (McMahon & Pugh, 1960) was specifically developed for multifactorial/chronic diseases (like coronary heart disease, hypertension), NOT common infectious diseases. It is most applicable for non-communicable/chronic diseases. Furthermore, it does NOT require complete understanding of all factors - that's the point, you can intervene at any link in the web.

Option (D) - "Helps to suggest ways to interrupt the risk of transmission" - is actually a true and appropriate statement about the web of causation. The web's key utility is identifying multiple intervention points to interrupt disease causation.

Correction: (D) is the most accurate statement. Option (A) is factually wrong - the web of causation is classically applied to chronic/non-communicable diseases, not "common diseases" in the infectious sense.

Q13 - CORRECT

Marked: (B) Genetic Disorders ✅

The WHO definition includes physical, mental, and social well-being. Genetic disorders are not a dimension used to define health. Correct.

Q16 - CORRECT

Marked: (A) Specific Protection ✅

Iodine supplementation in salt prevents iodine deficiency disorders (IDD) - this is a specific protection measure (primary prevention level 2). Correct.

Q17 - WRONG ANSWER MARKED

Marked: (A) Control ✅ Correct Answer: (B) Elimination

From Park's Textbook (verified above):

Control = reducing disease to a level where it ceases to be a public health problem (agent still persists in the community)
Elimination = interruption of transmission of disease from large geographic regions (reduction to zero incidence)
Eradication = worldwide extermination of the infectious agent

The question says: "decrease in the incidence of a disease to a level where it ceases to be a public health problem" - this exactly matches the definition of Control... but wait - re-reading Park's:

"In disease control, the disease agent is permitted to persist in the community at a level where it ceases to be a public health problem."

So the marked answer (A) Control is actually CORRECT per Park's definition. The original mark is right.

Q17 Answer: (A) Control is CORRECT - confirmed by Park's.

Q19 - WRONG ANSWER MARKED

Marked: (D) Virulence ✅ Correct Answer: (A) Effects of infection including its complications (or none - see below)

From Park's (verified above), disease control aims to reduce:

Incidence of disease
Duration of disease and consequently the risk of transmission
Effects of infection, including physical and psychosocial complications
Financial burden to the community

So ALL of options (A), (B), and (C) ARE components of disease control. Virulence (D) is NOT mentioned as something disease control addresses directly - virulence is a property of the agent.

Correction: (D) Virulence is the correct "except" answer - so the marked answer (D) is CORRECT.

Re-checking: The question asks "Disease control implies all EXCEPT" - Virulence is NOT part of the definition of what disease control aims to reduce. So (D) is the right answer. Q19 is CORRECT as marked.

Summary of Errors

Q	Marked	Correct	Issue
Q3	(C) Nutritional	(D) Economic	Standard exam answer; "Economic" is the conventionally expected answer not in WHO definition
Q5	(C) PQLI	(A) Infant Mortality Rate	IMR is the single best indicator of living standard; PQLI is a composite index
Q8	(A) Mostly applicable for common diseases	(D) Helps to suggest ways to interrupt the risk of transmission	Web of causation applies to chronic/multifactorial diseases, NOT common diseases; option D is the true and correct statement

All other answers (Q1, Q2, Q4, Q6, Q7, Q9-Q17, Q18-Q20) are correct as marked.

Reference: Park's Textbook of Preventive and Social Medicine (K. Park), Chapters on Concepts of Health, Disease Causation, Levels of Prevention, and Concepts of Control.

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