City of Omaha Class C Building
Contractor Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationale 2026 Q&A| Instant
Download Pdf
1. Which of the following is the primary purpose of the International
Residential Code (IRC)?
A. To regulate industrial manufacturing facilities
B. To establish minimum requirements for the safety, health, and welfare
of occupants in one- and two-family dwellings and townhouses
C. To regulate commercial high-rise construction only
D. To establish environmental protection standards for all buildings
Rationale: The IRC provides minimum regulations for one- and two-family
dwellings and townhouses to safeguard public health, safety, and welfare
through structural strength, fire safety, sanitation, energy conservation,
and other essential provisions.
2. Under the IRC, a building permit is generally required before:
A. Painting interior walls
B. Replacing furniture
C. Constructing, enlarging, altering, repairing, moving, or demolishing a
structure when required by the code
D. Cleaning gutters
,Rationale: Most construction activities affecting a building's structure or
systems require a permit before work begins to ensure compliance with
applicable code requirements.
3. The minimum required ceiling height for habitable rooms in new
dwellings is:
A. 6 feet 6 inches
B. 6 feet 8 inches
C. 7 feet
D. 8 feet
Rationale: The IRC generally requires habitable rooms, hallways,
bathrooms, toilet rooms, and portions of basements containing these
spaces to have a minimum ceiling height of 7 feet, with limited exceptions.
4. What is the minimum clear width required for an emergency escape
and rescue window opening?
A. 18 inches
B. 20 inches
C. 24 inches
D. 30 inches
Rationale: Emergency escape and rescue openings must have a minimum
clear width of 20 inches while also meeting minimum height and net clear
opening requirements.
5. What is the minimum net clear opening area for an emergency escape
and rescue window above grade?
A. 4.0 square feet
B. 5.7 square feet
C. 6.5 square feet
D. 7.5 square feet
, Rationale: Most emergency escape windows must provide at least 5.7
square feet of net clear opening. Grade-floor openings may be permitted
to have a smaller minimum opening.
6. Smoke alarms are required:
A. Only in kitchens
B. Only outside the home
C. In each sleeping room, outside each sleeping area, and on every story of
the dwelling
D. Only in unfinished basements
Rationale: Proper smoke alarm placement ensures occupants receive early
warning regardless of where a fire originates within the dwelling.
7. Carbon monoxide alarms are required when:
A. Every home has a fireplace
B. The dwelling contains fuel-fired appliances or has an attached garage
C. The home exceeds 2,000 square feet
D. The building has a basement
Rationale: Carbon monoxide alarms protect occupants from dangerous gas
produced by fuel-burning equipment or vehicles operating in attached
garages.
8. The minimum width of a stairway serving a dwelling is generally:
A. 30 inches
B. 32 inches
C. 36 inches
D. 42 inches
Rationale: The IRC requires a minimum stair width of 36 inches above the
handrail to allow safe occupant movement.
9. The maximum riser height permitted for residential stairs is:
Contractor Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationale 2026 Q&A| Instant
Download Pdf
1. Which of the following is the primary purpose of the International
Residential Code (IRC)?
A. To regulate industrial manufacturing facilities
B. To establish minimum requirements for the safety, health, and welfare
of occupants in one- and two-family dwellings and townhouses
C. To regulate commercial high-rise construction only
D. To establish environmental protection standards for all buildings
Rationale: The IRC provides minimum regulations for one- and two-family
dwellings and townhouses to safeguard public health, safety, and welfare
through structural strength, fire safety, sanitation, energy conservation,
and other essential provisions.
2. Under the IRC, a building permit is generally required before:
A. Painting interior walls
B. Replacing furniture
C. Constructing, enlarging, altering, repairing, moving, or demolishing a
structure when required by the code
D. Cleaning gutters
,Rationale: Most construction activities affecting a building's structure or
systems require a permit before work begins to ensure compliance with
applicable code requirements.
3. The minimum required ceiling height for habitable rooms in new
dwellings is:
A. 6 feet 6 inches
B. 6 feet 8 inches
C. 7 feet
D. 8 feet
Rationale: The IRC generally requires habitable rooms, hallways,
bathrooms, toilet rooms, and portions of basements containing these
spaces to have a minimum ceiling height of 7 feet, with limited exceptions.
4. What is the minimum clear width required for an emergency escape
and rescue window opening?
A. 18 inches
B. 20 inches
C. 24 inches
D. 30 inches
Rationale: Emergency escape and rescue openings must have a minimum
clear width of 20 inches while also meeting minimum height and net clear
opening requirements.
5. What is the minimum net clear opening area for an emergency escape
and rescue window above grade?
A. 4.0 square feet
B. 5.7 square feet
C. 6.5 square feet
D. 7.5 square feet
, Rationale: Most emergency escape windows must provide at least 5.7
square feet of net clear opening. Grade-floor openings may be permitted
to have a smaller minimum opening.
6. Smoke alarms are required:
A. Only in kitchens
B. Only outside the home
C. In each sleeping room, outside each sleeping area, and on every story of
the dwelling
D. Only in unfinished basements
Rationale: Proper smoke alarm placement ensures occupants receive early
warning regardless of where a fire originates within the dwelling.
7. Carbon monoxide alarms are required when:
A. Every home has a fireplace
B. The dwelling contains fuel-fired appliances or has an attached garage
C. The home exceeds 2,000 square feet
D. The building has a basement
Rationale: Carbon monoxide alarms protect occupants from dangerous gas
produced by fuel-burning equipment or vehicles operating in attached
garages.
8. The minimum width of a stairway serving a dwelling is generally:
A. 30 inches
B. 32 inches
C. 36 inches
D. 42 inches
Rationale: The IRC requires a minimum stair width of 36 inches above the
handrail to allow safe occupant movement.
9. The maximum riser height permitted for residential stairs is:
