CDDN — Certified Developmental Disabilities
Nurse,, WITH CORRECT ACTUAL QUESTIONS AND
CORRECTLY WELL DEFINED ANSWERS LATEST
ALREADY GRADED A+ (2025/2026)
Section 1: Foundations of Developmental Disabilities (Questions 1-15)
1. The federal definition of a developmental disability requires that the
condition:
A) Is diagnosed after age 22 and limits one major life activity
B) Is a chronic condition that originates before age 22 and results in
functional limitations in three or more major life activities
C) Is an acute illness with temporary cognitive effects
D) Is a mental health condition diagnosed in adulthood
Correct ,,,,answer,,,: B
Rationale: The federal definition of developmental disability (DD Act)
requires onset before age 22, a chronic and lifelong nature, and
significant functional limitations in at least three major life activities (e.g.,
self-care, learning, mobility, communication, independent living).
2. Approximately what percentage of children in the United States have
one or more developmental disabilities?
A) 1 in 100 (1%)
B) 1 in 20 (5%)
C) 1 in 10 (10%)
D) 1 in 6 (17%)
Correct ,,,,answer,,,: D
Rationale: According to the CDC, recent estimates indicate that about 1
,in 6 children (approximately 17%) aged 3–17 years have one or more
developmental disabilities.
3. A nurse explains the difference between "impairment" and "disability"
to a student. The nurse should state that:
A) Impairment is a cognitive dysfunction, while disability is a physical
dysfunction
B) Impairment is a functional restriction, while disability is a restriction
within an expected range and environment
C) Impairment can be cured, while disability cannot
D) Impairment does not change over time, while disability may progress
Correct ,,,,answer,,,: B
Rationale: Impairment refers to the functional restriction of ability (e.g.,
inability to walk). Disability refers to the restriction of ability within an
expected range and in a specific environment (e.g., inability to access a
building due to being unable to walk).
4. Which legislative act originally mandated free appropriate public
education (FAPE) and individualized education plans (IEPs) for children
with disabilities?
A) Americans with Disabilities Act (ADA) of 1990
B) Education for All Handicapped Children Act of 1975 (now IDEA)
C) Rehabilitation Act of 1973 (Section 504)
D) Individuals with Disabilities Education Act (IDEA) of 2004
Correct ,,,,answer,,,: B
Rationale: The Education for All Handicapped Children Act of 1975 was
the original law mandating free appropriate public education and IEPs. It
was later renamed the Individuals with Disabilities Education Act (IDEA).
5. The Americans with Disabilities Act (ADA) of 1990 prohibits
discrimination based on disability in which areas?
,A) Employment and housing only
B) Education and employment only
C) Employment, public services, public accommodations, and
telecommunications
D) Healthcare and social services only
Correct ,,,,answer,,,: C
Rationale: The ADA prohibits discrimination in five key areas:
employment (Title I), public services/transportation (Title II), public
accommodations (Title III), telecommunications (Title IV), and
miscellaneous provisions (Title V).
6. Which of the following is the most common known cause of intellectual
disability?
A) Traumatic brain injury in early childhood
B) Premature birth
C) Maternal infections during pregnancy
D) Genetic syndromes
Correct ,,,,answer,,,: D
Rationale: Genetic syndromes, such as Down syndrome and Fragile X
syndrome, are among the leading causes of developmental disabilities.
While prenatal infections and premature birth contribute, genetic causes
are most common among known etiologies.
7. A nurse working with a patient with a developmental disability applies
the "biopsychosocial model." This model considers:
A) Only the medical diagnosis
B) Only the social environment
C) The biological cause, psychological functioning, and social context
D) Only the functional limitations
, Correct ,,,,answer,,,: C
Rationale: The biopsychosocial model considers the interplay of
biological (e.g., genetic, medical), psychological (e.g., cognitive,
emotional), and social (e.g., environment, relationships) factors in
understanding and treating disability.
8. The nurse understands that a "dual diagnosis" in the context of
developmental disabilities refers to:
A) Two separate physical health conditions
B) Co-occurring intellectual disability and mental health disorder
C) Two different genetic syndromes
D) Intellectual disability and a medical condition
Correct ,,,,answer,,,: B
Rationale: In the field of developmental disabilities, "dual diagnosis"
typically refers to the co-occurrence of an intellectual or developmental
disability and a mental health (psychiatric) disorder. This population often
has complex care needs.
9. Which model of disability focuses on eliminating barriers in the
physical and social environment to promote full participation?
A) Medical model
B) Rehabilitation model
C) Social model
D) Biopsychosocial model
Correct ,,,,answer,,,: C
Rationale: The social model of disability views disability as caused by
societal barriers (attitudinal, physical, systemic) rather than by the
individual's impairment. It focuses on removing these barriers to enable
participation.
Nurse,, WITH CORRECT ACTUAL QUESTIONS AND
CORRECTLY WELL DEFINED ANSWERS LATEST
ALREADY GRADED A+ (2025/2026)
Section 1: Foundations of Developmental Disabilities (Questions 1-15)
1. The federal definition of a developmental disability requires that the
condition:
A) Is diagnosed after age 22 and limits one major life activity
B) Is a chronic condition that originates before age 22 and results in
functional limitations in three or more major life activities
C) Is an acute illness with temporary cognitive effects
D) Is a mental health condition diagnosed in adulthood
Correct ,,,,answer,,,: B
Rationale: The federal definition of developmental disability (DD Act)
requires onset before age 22, a chronic and lifelong nature, and
significant functional limitations in at least three major life activities (e.g.,
self-care, learning, mobility, communication, independent living).
2. Approximately what percentage of children in the United States have
one or more developmental disabilities?
A) 1 in 100 (1%)
B) 1 in 20 (5%)
C) 1 in 10 (10%)
D) 1 in 6 (17%)
Correct ,,,,answer,,,: D
Rationale: According to the CDC, recent estimates indicate that about 1
,in 6 children (approximately 17%) aged 3–17 years have one or more
developmental disabilities.
3. A nurse explains the difference between "impairment" and "disability"
to a student. The nurse should state that:
A) Impairment is a cognitive dysfunction, while disability is a physical
dysfunction
B) Impairment is a functional restriction, while disability is a restriction
within an expected range and environment
C) Impairment can be cured, while disability cannot
D) Impairment does not change over time, while disability may progress
Correct ,,,,answer,,,: B
Rationale: Impairment refers to the functional restriction of ability (e.g.,
inability to walk). Disability refers to the restriction of ability within an
expected range and in a specific environment (e.g., inability to access a
building due to being unable to walk).
4. Which legislative act originally mandated free appropriate public
education (FAPE) and individualized education plans (IEPs) for children
with disabilities?
A) Americans with Disabilities Act (ADA) of 1990
B) Education for All Handicapped Children Act of 1975 (now IDEA)
C) Rehabilitation Act of 1973 (Section 504)
D) Individuals with Disabilities Education Act (IDEA) of 2004
Correct ,,,,answer,,,: B
Rationale: The Education for All Handicapped Children Act of 1975 was
the original law mandating free appropriate public education and IEPs. It
was later renamed the Individuals with Disabilities Education Act (IDEA).
5. The Americans with Disabilities Act (ADA) of 1990 prohibits
discrimination based on disability in which areas?
,A) Employment and housing only
B) Education and employment only
C) Employment, public services, public accommodations, and
telecommunications
D) Healthcare and social services only
Correct ,,,,answer,,,: C
Rationale: The ADA prohibits discrimination in five key areas:
employment (Title I), public services/transportation (Title II), public
accommodations (Title III), telecommunications (Title IV), and
miscellaneous provisions (Title V).
6. Which of the following is the most common known cause of intellectual
disability?
A) Traumatic brain injury in early childhood
B) Premature birth
C) Maternal infections during pregnancy
D) Genetic syndromes
Correct ,,,,answer,,,: D
Rationale: Genetic syndromes, such as Down syndrome and Fragile X
syndrome, are among the leading causes of developmental disabilities.
While prenatal infections and premature birth contribute, genetic causes
are most common among known etiologies.
7. A nurse working with a patient with a developmental disability applies
the "biopsychosocial model." This model considers:
A) Only the medical diagnosis
B) Only the social environment
C) The biological cause, psychological functioning, and social context
D) Only the functional limitations
, Correct ,,,,answer,,,: C
Rationale: The biopsychosocial model considers the interplay of
biological (e.g., genetic, medical), psychological (e.g., cognitive,
emotional), and social (e.g., environment, relationships) factors in
understanding and treating disability.
8. The nurse understands that a "dual diagnosis" in the context of
developmental disabilities refers to:
A) Two separate physical health conditions
B) Co-occurring intellectual disability and mental health disorder
C) Two different genetic syndromes
D) Intellectual disability and a medical condition
Correct ,,,,answer,,,: B
Rationale: In the field of developmental disabilities, "dual diagnosis"
typically refers to the co-occurrence of an intellectual or developmental
disability and a mental health (psychiatric) disorder. This population often
has complex care needs.
9. Which model of disability focuses on eliminating barriers in the
physical and social environment to promote full participation?
A) Medical model
B) Rehabilitation model
C) Social model
D) Biopsychosocial model
Correct ,,,,answer,,,: C
Rationale: The social model of disability views disability as caused by
societal barriers (attitudinal, physical, systemic) rather than by the
individual's impairment. It focuses on removing these barriers to enable
participation.
