WGU D402 COMMUNITY AND PUBLIC HEALTH OBJECTIVE ASSESSMENT EXAM
– QUESTIONS AND ANSWERS | VERIFIED AND WELL DETAILED ANSWERS |
PLUS RATIONALES | DOWNLOAD AND PASS | LATEST EXAM UPDATE
2026/2027
Core Domains
Epidemiology and Disease Prevention
Community Health Assessment and Planning
Social Determinants of Health and Health Equity
Public Health Policy, Law, and Ethics
Environmental Health and Occupational Safety
Health Education and Behavioral Science
Global Health and Infectious Disease Control
Program Evaluation and Quality Improvement
Emergency Preparedness and Response
Healthcare Systems, Financing, and Delivery
Introduction
This comprehensive assessment is designed to rigorously evaluate your mastery of
the foundational and applied principles of community and public health, aligning
with the core competencies required for the WGU D402 exam. The exam covers a
broad spectrum of topics, from epidemiological methodologies and biostatistics to
the intricate social, behavioral, and environmental factors that shape population
health outcomes. You will be challenged with both direct knowledge-based
questions and complex, scenario-based problems that test your critical thinking and
decision-making skills in real-world public health contexts. The questions are
structured to assess your ability to apply theoretical concepts to practical situations,
requiring you to analyze data, evaluate interventions, and navigate ethical and
,legal frameworks. This examination emphasizes the practical application of
knowledge, ensuring you are prepared to effectively assess community needs, plan
and implement evidence-based interventions, and advocate for health equity. By
successfully completing this assessment, you will demonstrate your readiness to
contribute meaningfully to the improvement of community and population health
as a competent public health professional.
SECTION ONE: QUESTIONS 1–50
1. A public health nurse is investigating a sudden increase in reported cases of a
particular gastrointestinal illness. Which epidemiological measure is MOST
useful for identifying the source of the outbreak?
A. The case fatality rate
B. The point prevalence of the illness
C. The attack rate among people who attended a specific event
D. The crude mortality rate for the region
🟢 Correct Answer: C. The attack rate among people who attended a specific
event
🔴 Explanation: The attack rate is a measure of the proportion of people who
become ill after a specific exposure or event, such as a gathering. It is the most
useful measure in an outbreak investigation to identify the source, as comparing
the attack rates among different groups (e.g., those who ate a particular food
versus those who didn't) can pinpoint the potential source of infection.
2. Which of the following is a PRIMARY prevention activity?
A. Mammography screening for breast cancer
B. Contact tracing for a patient with active tuberculosis
,C. Administration of the MMR vaccine to a 12-month-old child
D. Provision of insulin for a patient with type 1 diabetes
🟢 Correct Answer: C. Administration of the MMR vaccine to a 12-month-old
child
🔴 Explanation: Primary prevention aims to prevent disease or injury before it
occurs. Vaccination prevents the initial occurrence of the disease. Mammography
is a secondary prevention activity (early detection), contact tracing is a tertiary
prevention strategy to prevent further spread, and insulin management is a
tertiary prevention activity to manage an existing condition.
3. A city is experiencing an epidemic of obesity. A public health official is
proposing a tax on sugary beverages. This approach is an example of which of
the following?
A. Health education initiative
B. Policy-level intervention
C. Clinical preventive service
D. Behavioral therapy
🟢 Correct Answer: B. Policy-level intervention
🔴 Explanation: A policy-level intervention uses laws, regulations, or rules to
influence behavior and improve health outcomes. A tax on sugary beverages is a
fiscal policy designed to discourage consumption. It is not a one-on-one
education, clinical service, or therapy.
4. An epidemiologist is studying a rare disease in a small population. Which
study design is MOST appropriate to investigate the potential causes of this
disease?
A. Prospective cohort study
B. Randomized controlled trial
, C. Case-control study
D. Retrospective cohort study
🟢 Correct Answer: C. Case-control study
🔴 Explanation: Case-control studies are ideal for rare diseases because they are
efficient and cost-effective. They begin by identifying people with the disease
(cases) and comparing their past exposures to those of people without the
disease (controls). This design does not require a large cohort to be followed for a
long time to observe the rare outcome.
5. The 'Social Determinants of Health' are best described as:
A. Genetic predispositions to certain diseases
B. The conditions in which people are born, grow, live, work, and age
C. Individual lifestyle choices like diet and exercise
D. The availability of healthcare services
🟢 Correct Answer: B. The conditions in which people are born, grow, live, work,
and age
🔴 Explanation: Social Determinants of Health (SDOH) are the non-medical
factors that influence health outcomes. These are the conditions in which people
are born, grow, work, live, and age, and the wider set of forces and systems
shaping the conditions of daily life (e.g., economic policies, social norms, and
political systems). While choices and healthcare access are related, they are
downstream effects of these root conditions.
6. A community health assessment identifies that a significant portion of a
population lacks access to fresh produce. Which public health principle is
MOST directly violated?
A. Beneficence
B. Social Justice
– QUESTIONS AND ANSWERS | VERIFIED AND WELL DETAILED ANSWERS |
PLUS RATIONALES | DOWNLOAD AND PASS | LATEST EXAM UPDATE
2026/2027
Core Domains
Epidemiology and Disease Prevention
Community Health Assessment and Planning
Social Determinants of Health and Health Equity
Public Health Policy, Law, and Ethics
Environmental Health and Occupational Safety
Health Education and Behavioral Science
Global Health and Infectious Disease Control
Program Evaluation and Quality Improvement
Emergency Preparedness and Response
Healthcare Systems, Financing, and Delivery
Introduction
This comprehensive assessment is designed to rigorously evaluate your mastery of
the foundational and applied principles of community and public health, aligning
with the core competencies required for the WGU D402 exam. The exam covers a
broad spectrum of topics, from epidemiological methodologies and biostatistics to
the intricate social, behavioral, and environmental factors that shape population
health outcomes. You will be challenged with both direct knowledge-based
questions and complex, scenario-based problems that test your critical thinking and
decision-making skills in real-world public health contexts. The questions are
structured to assess your ability to apply theoretical concepts to practical situations,
requiring you to analyze data, evaluate interventions, and navigate ethical and
,legal frameworks. This examination emphasizes the practical application of
knowledge, ensuring you are prepared to effectively assess community needs, plan
and implement evidence-based interventions, and advocate for health equity. By
successfully completing this assessment, you will demonstrate your readiness to
contribute meaningfully to the improvement of community and population health
as a competent public health professional.
SECTION ONE: QUESTIONS 1–50
1. A public health nurse is investigating a sudden increase in reported cases of a
particular gastrointestinal illness. Which epidemiological measure is MOST
useful for identifying the source of the outbreak?
A. The case fatality rate
B. The point prevalence of the illness
C. The attack rate among people who attended a specific event
D. The crude mortality rate for the region
🟢 Correct Answer: C. The attack rate among people who attended a specific
event
🔴 Explanation: The attack rate is a measure of the proportion of people who
become ill after a specific exposure or event, such as a gathering. It is the most
useful measure in an outbreak investigation to identify the source, as comparing
the attack rates among different groups (e.g., those who ate a particular food
versus those who didn't) can pinpoint the potential source of infection.
2. Which of the following is a PRIMARY prevention activity?
A. Mammography screening for breast cancer
B. Contact tracing for a patient with active tuberculosis
,C. Administration of the MMR vaccine to a 12-month-old child
D. Provision of insulin for a patient with type 1 diabetes
🟢 Correct Answer: C. Administration of the MMR vaccine to a 12-month-old
child
🔴 Explanation: Primary prevention aims to prevent disease or injury before it
occurs. Vaccination prevents the initial occurrence of the disease. Mammography
is a secondary prevention activity (early detection), contact tracing is a tertiary
prevention strategy to prevent further spread, and insulin management is a
tertiary prevention activity to manage an existing condition.
3. A city is experiencing an epidemic of obesity. A public health official is
proposing a tax on sugary beverages. This approach is an example of which of
the following?
A. Health education initiative
B. Policy-level intervention
C. Clinical preventive service
D. Behavioral therapy
🟢 Correct Answer: B. Policy-level intervention
🔴 Explanation: A policy-level intervention uses laws, regulations, or rules to
influence behavior and improve health outcomes. A tax on sugary beverages is a
fiscal policy designed to discourage consumption. It is not a one-on-one
education, clinical service, or therapy.
4. An epidemiologist is studying a rare disease in a small population. Which
study design is MOST appropriate to investigate the potential causes of this
disease?
A. Prospective cohort study
B. Randomized controlled trial
, C. Case-control study
D. Retrospective cohort study
🟢 Correct Answer: C. Case-control study
🔴 Explanation: Case-control studies are ideal for rare diseases because they are
efficient and cost-effective. They begin by identifying people with the disease
(cases) and comparing their past exposures to those of people without the
disease (controls). This design does not require a large cohort to be followed for a
long time to observe the rare outcome.
5. The 'Social Determinants of Health' are best described as:
A. Genetic predispositions to certain diseases
B. The conditions in which people are born, grow, live, work, and age
C. Individual lifestyle choices like diet and exercise
D. The availability of healthcare services
🟢 Correct Answer: B. The conditions in which people are born, grow, live, work,
and age
🔴 Explanation: Social Determinants of Health (SDOH) are the non-medical
factors that influence health outcomes. These are the conditions in which people
are born, grow, work, live, and age, and the wider set of forces and systems
shaping the conditions of daily life (e.g., economic policies, social norms, and
political systems). While choices and healthcare access are related, they are
downstream effects of these root conditions.
6. A community health assessment identifies that a significant portion of a
population lacks access to fresh produce. Which public health principle is
MOST directly violated?
A. Beneficence
B. Social Justice
