EPIB301 EXAM 1 2026 COMPREHENSIVE QUESTIONS AND VERIFIED
ANSWERS/SOLUTIONS | MULTIPLE CHOICE | SOLVED!!
SECTION A: INTRODUCTION TO EPIDEMIOLOGY AND CORE CONCEPTS
1. Which of the following best defines epidemiology?
(A) The study of the distribution and determinants of health-related states in specified
populations and the application of this study to control health problems
(B) The study of the causes of disease in individual patients
(C) The clinical diagnosis and treatment of infectious diseases
(D) The statistical analysis of hospital administrative data
Answer: (A) ✓
Rationale: Epidemiology focuses on populations, not individuals, and encompasses
distribution, determinants, and application to control.
2. The term "distribution" in epidemiology refers to:
(A) The determinants of disease
(B) The frequency and pattern of health events in a population
(C) The treatment protocols for disease
(D) The genetic makeup of individuals
Answer: (B) ✓
Rationale: Distribution describes how disease occurs in terms of time, place, and person.
3. "Determinants" in epidemiology refer to:
(A) The frequency of disease occurrence
(B) The geographic spread of disease
(C) Factors that cause or influence the occurrence of disease
(D) The number of deaths from disease
Answer: (C) ✓
Rationale: Determinants are risk factors or exposures associated with health outcomes.
,4. Which of the following is NOT a primary function of epidemiology?
(A) Identifying risk factors for disease
(B) Evaluating interventions
(C) Providing clinical treatment to individual patients
(D) Describing the health status of populations
Answer: (C) ✓
Rationale: Clinical treatment is the domain of clinical medicine; epidemiology focuses on
populations.
5. John Snow is credited with which major epidemiological contribution?
(A) Development of the smallpox vaccine
(B) Identifying the waterborne transmission of cholera
(C) Discovery of penicillin
(D) Development of the germ theory
Answer: (B) ✓
Rationale: Snow's investigation of the Broad Street pump established waterborne cholera
transmission.
6. The epidemiological triad consists of:
(A) Host, agent, and environment
(B) Incidence, prevalence, and mortality
(C) Sensitivity, specificity, and predictive value
(D) Person, place, and time
Answer: (A) ✓
Rationale: The triad models disease causation through interaction of host, agent, and
environment.
7. Which of the following is an example of a vector?
(A) A contaminated water supply
(B) A mosquito transmitting malaria
(C) A virus causing influenza
(D) A genetic mutation
Answer: (B) ✓
Rationale: Vectors are living organisms that transmit disease between hosts.
8. The "web of causation" model is most useful for:
(A) Acute infectious diseases with a single cause
(B) Chronic diseases with multiple interacting factors
(C) Genetic disorders only
(D) Occupational injuries only
,Answer: (B) ✓
Rationale: The web of causation addresses multifactorial chronic disease etiology.
9. Which of the following best describes "population health"?
(A) The health outcomes of a group of individuals including distribution within the group
(B) The health of each individual in a clinic
(C) The financial cost of healthcare
(D) The number of hospitals in a region
Answer: (A) ✓
Rationale: Population health emphasizes group-level outcomes and their distribution.
10. A "determinant" that is necessary but not sufficient for disease is:
(A) A sufficient cause
(B) A necessary cause
(C) A component cause
(D) A confounding factor
Answer: (B) ✓
Rationale: A necessary cause must be present for disease but alone does not guarantee it.
SECTION B: MEASURES OF DISEASE FREQUENCY
11. Incidence measures:
(A) Existing cases at a point in time
(B) New cases occurring in a population over a specified period
(C) Total deaths in a population
(D) Hospital admissions
Answer: (B) ✓
Rationale: Incidence quantifies new disease occurrence over time.
12. Prevalence measures:
(A) New cases only
(B) All existing cases at a given time
(C) Deaths from disease
(D) Years of potential life lost
Answer: (B) ✓
Rationale: Prevalence includes both new and pre-existing cases.
13. Which measure is most appropriate for assessing the risk of developing a disease?
(A) Point prevalence
(B) Period prevalence
(C) Incidence rate
, (D) Attack rate
Answer: (C) ✓
Rationale: Incidence rate measures the risk of new disease development.
14. The formula for point prevalence is:
(A) New cases / population at risk
(B) All cases at a point in time / total population
(C) Deaths / total population
(D) New cases / person-time
Answer: (B) ✓
Rationale: Point prevalence = all existing cases at a specific time divided by total
population.
15. Incidence density is expressed as:
(A) Cases per 1,000 population
(B) Cases per person-time of observation
(C) Cases per 100,000 population
(D) Cases per hospital admission
Answer: (B) ✓
Rationale: Incidence density uses person-time denominators.
16. If a disease has a long duration and low mortality, prevalence will be:
(A) Low relative to incidence
(B) High relative to incidence
(C) Equal to incidence
(D) Unrelated to incidence
Answer: (B) ✓
Rationale: Longer duration increases prevalence because cases accumulate.
17. Which of the following will increase prevalence without changing incidence?
(A) Improved cure rates
(B) Increased mortality
(C) Improved survival without cure
(D) Decreased disease duration
Answer: (C) ✓
Rationale: Prolonged survival increases the pool of existing cases.
18. The relationship between prevalence (P), incidence (I), and duration (D) is:
(A) P = I / D
(B) P = I × D
ANSWERS/SOLUTIONS | MULTIPLE CHOICE | SOLVED!!
SECTION A: INTRODUCTION TO EPIDEMIOLOGY AND CORE CONCEPTS
1. Which of the following best defines epidemiology?
(A) The study of the distribution and determinants of health-related states in specified
populations and the application of this study to control health problems
(B) The study of the causes of disease in individual patients
(C) The clinical diagnosis and treatment of infectious diseases
(D) The statistical analysis of hospital administrative data
Answer: (A) ✓
Rationale: Epidemiology focuses on populations, not individuals, and encompasses
distribution, determinants, and application to control.
2. The term "distribution" in epidemiology refers to:
(A) The determinants of disease
(B) The frequency and pattern of health events in a population
(C) The treatment protocols for disease
(D) The genetic makeup of individuals
Answer: (B) ✓
Rationale: Distribution describes how disease occurs in terms of time, place, and person.
3. "Determinants" in epidemiology refer to:
(A) The frequency of disease occurrence
(B) The geographic spread of disease
(C) Factors that cause or influence the occurrence of disease
(D) The number of deaths from disease
Answer: (C) ✓
Rationale: Determinants are risk factors or exposures associated with health outcomes.
,4. Which of the following is NOT a primary function of epidemiology?
(A) Identifying risk factors for disease
(B) Evaluating interventions
(C) Providing clinical treatment to individual patients
(D) Describing the health status of populations
Answer: (C) ✓
Rationale: Clinical treatment is the domain of clinical medicine; epidemiology focuses on
populations.
5. John Snow is credited with which major epidemiological contribution?
(A) Development of the smallpox vaccine
(B) Identifying the waterborne transmission of cholera
(C) Discovery of penicillin
(D) Development of the germ theory
Answer: (B) ✓
Rationale: Snow's investigation of the Broad Street pump established waterborne cholera
transmission.
6. The epidemiological triad consists of:
(A) Host, agent, and environment
(B) Incidence, prevalence, and mortality
(C) Sensitivity, specificity, and predictive value
(D) Person, place, and time
Answer: (A) ✓
Rationale: The triad models disease causation through interaction of host, agent, and
environment.
7. Which of the following is an example of a vector?
(A) A contaminated water supply
(B) A mosquito transmitting malaria
(C) A virus causing influenza
(D) A genetic mutation
Answer: (B) ✓
Rationale: Vectors are living organisms that transmit disease between hosts.
8. The "web of causation" model is most useful for:
(A) Acute infectious diseases with a single cause
(B) Chronic diseases with multiple interacting factors
(C) Genetic disorders only
(D) Occupational injuries only
,Answer: (B) ✓
Rationale: The web of causation addresses multifactorial chronic disease etiology.
9. Which of the following best describes "population health"?
(A) The health outcomes of a group of individuals including distribution within the group
(B) The health of each individual in a clinic
(C) The financial cost of healthcare
(D) The number of hospitals in a region
Answer: (A) ✓
Rationale: Population health emphasizes group-level outcomes and their distribution.
10. A "determinant" that is necessary but not sufficient for disease is:
(A) A sufficient cause
(B) A necessary cause
(C) A component cause
(D) A confounding factor
Answer: (B) ✓
Rationale: A necessary cause must be present for disease but alone does not guarantee it.
SECTION B: MEASURES OF DISEASE FREQUENCY
11. Incidence measures:
(A) Existing cases at a point in time
(B) New cases occurring in a population over a specified period
(C) Total deaths in a population
(D) Hospital admissions
Answer: (B) ✓
Rationale: Incidence quantifies new disease occurrence over time.
12. Prevalence measures:
(A) New cases only
(B) All existing cases at a given time
(C) Deaths from disease
(D) Years of potential life lost
Answer: (B) ✓
Rationale: Prevalence includes both new and pre-existing cases.
13. Which measure is most appropriate for assessing the risk of developing a disease?
(A) Point prevalence
(B) Period prevalence
(C) Incidence rate
, (D) Attack rate
Answer: (C) ✓
Rationale: Incidence rate measures the risk of new disease development.
14. The formula for point prevalence is:
(A) New cases / population at risk
(B) All cases at a point in time / total population
(C) Deaths / total population
(D) New cases / person-time
Answer: (B) ✓
Rationale: Point prevalence = all existing cases at a specific time divided by total
population.
15. Incidence density is expressed as:
(A) Cases per 1,000 population
(B) Cases per person-time of observation
(C) Cases per 100,000 population
(D) Cases per hospital admission
Answer: (B) ✓
Rationale: Incidence density uses person-time denominators.
16. If a disease has a long duration and low mortality, prevalence will be:
(A) Low relative to incidence
(B) High relative to incidence
(C) Equal to incidence
(D) Unrelated to incidence
Answer: (B) ✓
Rationale: Longer duration increases prevalence because cases accumulate.
17. Which of the following will increase prevalence without changing incidence?
(A) Improved cure rates
(B) Increased mortality
(C) Improved survival without cure
(D) Decreased disease duration
Answer: (C) ✓
Rationale: Prolonged survival increases the pool of existing cases.
18. The relationship between prevalence (P), incidence (I), and duration (D) is:
(A) P = I / D
(B) P = I × D
