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ICC 75 practice questions

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Question 1Codes and Standards

Under the International Building Code, which occupancy group is intended for the gathering of persons for civic, social, or religious functions?

  1. Group A Correct answer.
  2. Group M
  3. Group B
  4. Group E

Explanation

Group A covers assembly occupancies, where people congregate for civic, social, religious, or recreational purposes. The other groups named apply to business, educational, and mercantile uses respectively.

Question 2Codes and Standards

Type V construction is best described as a type in which:

  1. noncombustible members are required
  2. unlimited height and area are allowed
  3. heavy timber members are required
  4. combustible members are permitted Correct answer.

Explanation

Type V permits structural elements of combustible materials, subject to the height and area limits in the code tables. Types I and II are the noncombustible types, and Type IV is heavy timber.

Question 3Codes and Standards

Under ICC A117.1, the minimum clear width of an accessible route is:

  1. 48 inches
  2. 32 inches
  3. 44 inches
  4. 36 inches Correct answer.

Explanation

An accessible route must provide at least 36 inches of clear width, except where the standard expressly permits a narrower condition for a limited distance. The width is measured between the finished surfaces of the route.

Question 4Codes and Standards

The International Residential Code applies primarily to:

  1. high-rise office buildings
  2. industrial process plants
  3. all commercial buildings
  4. dwellings and townhouses Correct answer.

Explanation

The IRC governs detached one- and two-family dwellings and townhouses. Other building types fall under the International Building Code or other code volumes.

Question 5Codes and Standards

In the ICC family of codes, a provision stated with the word "shall" is:

  1. optional
  2. a recommended practice
  3. mandatory Correct answer.
  4. advisory guidance

Explanation

Code text uses "shall" for mandatory requirements. Permissive provisions use "may," while nonmandatory guidance appears in commentary rather than in enforceable code language.

Question 6Codes and Standards

The height of a handrail above stair tread nosings must fall within:

  1. 28 to 32 inches
  2. 30 to 34 inches
  3. 36 to 42 inches
  4. 34 to 38 inches Correct answer.

Explanation

Handrails are measured vertically from the tread nosing to the top of the rail and must be between 34 and 38 inches. The dimension is taken consistently along the stair.

Question 7Codes and Standards

The minimum height of a guard at the open side of a floor opening is:

  1. 48 inches
  2. 30 inches
  3. 42 inches Correct answer.
  4. 36 inches

Explanation

Guards must be at least 42 inches high, measured vertically above the floor or walking surface. The guard must also resist the prescribed concentrated load.

Question 8Codes and Standards

A city adopts the International Building Code with a set of local amendments. Those amendments:

  1. have no legal effect
  2. become part of the locally enforceable code Correct answer.
  3. must be identical to the model code
  4. apply only to state-owned buildings

Explanation

A jurisdiction adopts the model code by reference through ordinance and may amend it. The adopted ordinance, including the amendments, is the legally enforceable text within that jurisdiction.

Question 9Codes and Standards

A building is a high-rise under the IBC when an occupied floor is more than how far above the lowest level of fire department vehicle access?

  1. 100 feet
  2. 50 feet
  3. 75 feet Correct answer.
  4. 120 feet

Explanation

Section 202 defines a high-rise building by an occupied floor more than 75 feet above the lowest level of fire department vehicle access. The definition triggers additional requirements such as standpipes and fire command features.

Question 10Codes and Standards

Which document contains the installation requirements for automatic sprinkler systems referenced by the International Building Code?

  1. NFPA 72
  2. NFPA 13 Correct answer.
  3. NFPA 101
  4. NFPA 25

Explanation

NFPA 13 is the standard for the installation of sprinkler systems and is the reference used for system design, spacing, and acceptance.

Question 11Codes and Standards

Installation of fire alarm and detection systems is governed by which referenced standard?

  1. NFPA 13
  2. NFPA 20
  3. NFPA 72 Correct answer.
  4. NFPA 80

Explanation

NFPA 72, the National Fire Alarm and Signaling Code, sets the installation, performance, and testing requirements for detection and alarm systems.

Question 12Codes and Standards

The minimum clear width of a stairway serving an occupant load of 50 or more is:

  1. 44 inches Correct answer.
  2. 48 inches
  3. 36 inches
  4. 42 inches

Explanation

Stairways must be at least 44 inches wide, measured clear of projections. A reduced width is permitted only where the occupant load served is below the threshold that triggers the full width.

Question 13Codes and Standards

Occupant load for a space is computed by:

  1. dividing the occupant load factor by the floor area
  2. multiplying the floor area by the occupant load factor
  3. adding the floor area to the required exit width
  4. dividing the floor area by the occupant load factor Correct answer.

Explanation

Occupant load equals the floor area divided by the occupant load factor assigned to the use, using net or gross area as the table specifies. The result drives egress width, exits, and plumbing fixture counts.

Question 14Codes and Standards

Which international code establishes minimum energy efficiency requirements for building envelopes, systems, and lighting?

  1. IPC
  2. IFC
  3. IECC Correct answer.
  4. IMC

Explanation

The International Energy Conservation Code sets minimum efficiency requirements for the building envelope, mechanical systems, service water heating, and lighting. It is adopted alongside the other international codes.

Question 15Codes and Standards

Minimum ventilation rates for occupied spaces are specified in which code?

  1. IMC Correct answer.
  2. IFC
  3. IPC
  4. IBC

Explanation

The International Mechanical Code specifies minimum outdoor ventilation rates and the requirements for mechanical exhaust and supply systems.

Question 16Codes and Standards

The liquid seal of a plumbing fixture trap must be at least:

  1. 4 inches
  2. 2 inches Correct answer.
  3. 1 inch
  4. 3 inches

Explanation

A fixture trap must maintain a liquid seal of at least 2 inches and no more than 4 inches in depth. The seal prevents sewer gas from entering the building.

Question 17Codes and Standards

Under the International Fire Code, a liquid with a flash point below which value is classified as a flammable liquid?

  1. 200 degrees F (93.3 degrees C)
  2. 140 degrees F (60 degrees C)
  3. 73 degrees F (22.8 degrees C)
  4. 100 degrees F (37.8 degrees C) Correct answer.

Explanation

The IFC treats liquids with a flash point below 100 degrees F (37.8 degrees C) as flammable liquids. Liquids at or above that point are classified as combustible liquids.

Question 18Codes and Standards

A corridor leading from a tenant space to an enclosed stairway is classified as:

  1. an area of refuge
  2. exit access Correct answer.
  3. exit discharge
  4. an exit

Explanation

The means of egress has three components: exit access is the path from the occupied space to an exit, the exit is the protected element itself, and exit discharge leads from the exit to the public way.

Question 19Codes and Standards

Primary structural frame members in a Type I-B building must have a fire-resistance rating of:

  1. 2 hours Correct answer.
  2. 3 hours
  3. 1 hour
  4. 4 hours

Explanation

Table 601 assigns a 3-hour rating to primary structural frame members in Type I-A and a 2-hour rating in Type I-B. The reduction reflects the difference between the two subcategories.

Question 20Codes and Standards

Which test standard is used to establish the hourly fire-resistance rating of an assembly?

  1. ASTM E90
  2. ASTM C518
  3. ASTM E119 Correct answer.
  4. ASTM E84

Explanation

ASTM E119 is the standard fire test that exposes an assembly to a controlled fire and establishes its hourly fire-resistance rating.

Question 21Codes and Standards

Two occupancies of different groups are separated by a fire barrier in accordance with IBC Table 508.4. The required separation time depends on:

  1. the occupant load of the larger space only
  2. the occupancy groups involved and whether the building is sprinklered Correct answer.
  3. the construction type of the roof only
  4. the building height alone

Explanation

Table 508.4 bases the required separation on the pairing of occupancy groups, and the values are reduced where the building is equipped throughout with an automatic sprinkler system. Occupant load and roof type are not the drivers.

Question 22Codes and Standards

A designer proposes a material not recognized by the code. Under IBC Section 104.11, the building official may approve the alternative when:

  1. the material is used only in accessory structures
  2. the material costs less than listed alternatives
  3. the material carries a manufacturer's approval
  4. the proposal is shown to be equivalent in performance and safety Correct answer.

Explanation

Section 104.11 lets the building official approve alternative materials, designs, or methods where the proponent demonstrates equivalence in performance, quality, strength, effectiveness, fire resistance, durability, and safety.

Question 23Codes and Standards

Repair, alteration, and change of occupancy in an existing building are typically regulated by the:

  1. International Residential Code
  2. International Energy Conservation Code
  3. International Existing Building Code Correct answer.
  4. International Fire Code

Explanation

The IEBC provides the requirements for repair, alteration, addition, and change of occupancy in existing buildings, permitting work that would not satisfy new-construction provisions in every respect.

Question 24Codes and Standards

An incidental use space, such as a furnace room, exceeds the threshold listed in IBC Table 509. The space must be:

  1. separated by fire barriers or protected by an automatic sprinkler system Correct answer.
  2. enclosed with 4-hour fire walls
  3. reclassified as Group H
  4. relocated outside the building footprint

Explanation

Table 509 permits an incidental use to be either separated from the remainder of the building by the listed fire barrier or protected by an automatic fire-extinguishing system. The space keeps its primary occupancy classification.

Question 25Codes and Standards

When the quantity of a hazardous material in a space exceeds the maximum allowable quantity in IBC Table 307.1(1), the space is classified as:

  1. Group F-1
  2. Group H Correct answer.
  3. Group S-1
  4. Group U

Explanation

Table 307.1(1) sets maximum allowable quantities per control area; exceeding them for the material involved requires classification in Group H, with the specific subcategory depending on the material.

Question 26Codes and Standards

Which of the following best describes the scope of the International Building Code?

  1. Only fire prevention and life safety operations performed by the local fire department
  2. Only the installation of plumbing, mechanical and electrical systems in one- and two-family dwellings
  3. Only the structural design and lateral analysis of high-rise buildings and their foundations
  4. Construction, alteration, repair and use of buildings and structures Correct answer.

Explanation

IBC Section 101.2 makes the code applicable to the construction, alteration, movement, enlargement, replacement, repair, equipment, use and occupancy, location, maintenance, removal and demolition of buildings and structures. It is a comprehensive model building code rather than a trade-specific or height-specific document.

Question 27Codes and Standards

A certificate of occupancy issued by the building official signifies that:

  1. The contractor has completed all punch-list items and has been paid in full
  2. The owner has recorded the deed and paid all development impact fees
  3. The registered design professional has sealed the record drawings for the project
  4. The structure complies with the code and may be lawfully occupied Correct answer.

Explanation

IBC Section 111.1 requires a certificate of occupancy before a building or portion of it is occupied or a change of use occurs. It is issued after inspections confirm that the work complies with the approved construction documents and with the code.

Question 28Codes and Standards

Emergency illumination of the means of egress must be capable of operating for a duration of not less than:

  1. 90 minutes Correct answer.
  2. 30 minutes
  3. 1 hour
  4. 2 hours

Explanation

IBC Section 1008.3 requires emergency illumination of the means of egress for at least 90 minutes following failure of the normal lighting supply. The illumination must average not less than 1 footcandle along the path of egress travel.

Question 29Codes and Standards

The maximum slope permitted for a ramp used as part of an accessible route is:

  1. 1 unit vertical in 20 units horizontal
  2. 1 unit vertical in 12 units horizontal Correct answer.
  3. 1 unit vertical in 10 units horizontal
  4. 1 unit vertical in 8 units horizontal

Explanation

IBC Section 1012.2 limits ramp slope to 1 unit vertical in 12 units horizontal, or 8.33 percent. Surfaces with a slope no steeper than 1 unit vertical in 20 units horizontal are treated as walking surfaces rather than ramps.

Question 30Codes and Standards

Which document contains the technical accessibility criteria that the International Building Code references?

  1. NFPA 101, Life Safety Code
  2. ICC A117.1, Accessible and Usable Buildings and Facilities Correct answer.
  3. ASCE 7, Minimum Design Loads and Associated Criteria for Buildings and Other Structures
  4. ICC 500, Standard for the Design and Construction of Storm Shelters

Explanation

IBC Chapter 11 sets the scoping requirements for accessibility and references ICC A117.1 for the technical criteria. That standard establishes dimensions such as reach ranges, clear floor spaces, turning spaces and accessible route details.

Question 31Codes and Standards

In a Type V building, the structural elements are permitted to be of:

  1. Combustible materials as permitted by the code Correct answer.
  2. Heavy timber members of the minimum size specified for Type IV
  3. Noncombustible materials only, with no fire-resistance rating
  4. Noncombustible materials with a 2-hour fire-resistance rating

Explanation

IBC Section 602.5 permits the structural elements of Type V construction to be of combustible materials. Type V-A and Type V-B differ in the fire-resistance ratings applied to those combustible assemblies, not in whether combustibles are allowed.

Question 32Codes and Standards

Which of the following types of work is exempt from a building permit under the International Building Code?

  1. Painting, papering, tiling and similar finish work Correct answer.
  2. Removal of a portion of a load-bearing wall
  3. Construction of a new 600-square-foot detached garage
  4. Addition of a 200-square-foot room to a single-family dwelling

Explanation

IBC Section 105.2 exempts certain ordinary work from permits, including painting, papering, tiling, carpeting, cabinets, countertops and similar finish work. Structural work such as cutting a load-bearing wall is not exempt.

Question 33Codes and Standards

Where in the International Building Code are the referenced standards, such as ASTM and NFPA documents, listed?

  1. Chapter 27
  2. Chapter 34
  3. Chapter 35 Correct answer.
  4. Chapter 1

Explanation

IBC Chapter 35 lists each standard referenced in the code together with the edition that applies. Section 102.4 requires compliance with those referenced standards as part of the code's requirements.

Question 34Codes and Standards

In a nonsprinklered Group B occupancy, the maximum exit access travel distance is:

  1. 200 feet Correct answer.
  2. 175 feet
  3. 250 feet
  4. 150 feet

Explanation

IBC Table 1017.2 limits exit access travel distance in a nonsprinklered Group B occupancy to 200 feet. The permitted distance increases to 300 feet where the building is equipped throughout with an automatic sprinkler system.

Question 35Codes and Standards

A single story of a building has a computed occupant load of 650. The minimum number of exits required from that story is:

  1. 3 exits Correct answer.
  2. 2 exits
  3. 4 exits
  4. 1 exit

Explanation

IBC Table 1006.2.1 requires two exits or exit access doorways where the occupant load is 500 or fewer, three where it is 501 through 1,000, and four where it exceeds 1,000. At 650 occupants, three exits are required.

Question 36Codes and Standards

The required capacity of a stairway in the means of egress is computed using how much clear width per occupant?

  1. 0.2 inch (5.1 mm)
  2. 0.4 inch (10.2 mm)
  3. 0.15 inch (3.8 mm)
  4. 0.3 inch (7.6 mm) Correct answer.

Explanation

IBC Section 1005.3.2 assigns a capacity of 0.3 inch per occupant to stairways and 0.2 inch per occupant to other egress components. The required width for each component is the occupant load served multiplied by the applicable factor.

Question 37Codes and Standards

Fire separation distance is measured from the building exterior wall face to:

  1. The lot line, center line of a street or alley, or an imaginary line between buildings on the same lot Correct answer.
  2. The horizontal distance from the exterior wall to the nearest unprotected opening in that wall
  3. The distance from the building to the nearest fire hydrant or fire department connection
  4. The depth of the required front yard measured from the curb line of the adjoining public street

Explanation

IBC Chapter 2 defines fire separation distance as the distance measured from the building exterior wall to the lot line, to the center line of a street or alley, or to an imaginary line between two buildings on the same lot. The measurement is taken at right angles to the exterior wall.

Question 38Codes and Standards

An interior exit stairway connecting four stories or more must be enclosed with a fire barrier having a fire-resistance rating of not less than:

  1. 2 hours Correct answer.
  2. 1 hour
  3. 1-1/2 hours
  4. 3 hours

Explanation

IBC Section 1023.2 requires interior exit stairway enclosures to be rated not less than 2 hours where the stairway connects four stories or more. Where the stairway connects fewer than four stories, a 1-hour rating is permitted.

Question 39Codes and Standards

An interior finish classified as Class A has a flame spread index in the range of:

  1. 26 to 75
  2. 76 to 200
  3. 0 to 25 Correct answer.
  4. 201 to 500

Explanation

IBC Section 803.1.1 classifies interior finishes by flame spread index as determined by ASTM E84 or UL 723. Class A is 0 to 25, Class B is 26 to 75, and Class C is 76 to 200.

Question 40Codes and Standards

A door serving a room must swing in the direction of egress travel where the occupant load served is:

  1. 100 or more
  2. 50 or more Correct answer.
  3. 300 or more
  4. 30 or more

Explanation

IBC Section 1010.1.2.2 requires egress doors to swing in the direction of egress travel where the door serves an occupant load of 50 or more. Doors serving smaller occupant loads are permitted to swing against the direction of travel.

Question 41Codes and Standards

The minimum clear width of an accessible route, except at certain turning and passing spaces, is:

  1. 32 inches
  2. 30 inches
  3. 34 inches
  4. 36 inches Correct answer.

Explanation

ICC A117.1 requires an accessible route to provide a clear width of not less than 36 inches. A reduced width of 32 inches is permitted only for limited lengths, such as at doorways and short segments in existing buildings.

Question 42Codes and Standards

The maximum riser height permitted for a stairway in the means of egress is:

  1. 7 inches Correct answer.
  2. 7-1/2 inches
  3. 7-1/4 inches
  4. 7-3/4 inches

Explanation

IBC Section 1011.5.2 limits riser height to 7 inches and requires tread depth of not less than 11 inches. The section also limits variation between adjacent risers and treads within a flight to 3/8 inch.

Question 43Codes and Standards

The minimum uniformly distributed live load for floors in residential dwelling units is:

  1. 100 psf
  2. 50 psf
  3. 40 psf Correct answer.
  4. 30 psf

Explanation

IBC Table 1607.1 assigns a uniform live load of 40 psf to residential dwelling areas. Higher values are assigned to occupancies such as offices, assembly spaces, corridors and storage areas.

Question 44Codes and Standards

Ground snow load, roof snow load and the rain-on-snow surcharge used in design are determined in accordance with:

  1. ACI 318
  2. AISC 360
  3. NDS
  4. ASCE 7 Correct answer.

Explanation

IBC Section 1608.1 requires snow loads to be determined in accordance with ASCE 7, using the ground snow load map together with the exposure, thermal and drift factors in that standard. The standard converts ground snow load into roof snow load and addresses rain-on-snow conditions.

Question 45Codes and Standards

Standpipe systems required by the International Building Code must be designed and installed in accordance with which standard?

  1. NFPA 13
  2. NFPA 14 Correct answer.
  3. NFPA 20
  4. NFPA 24

Explanation

IBC Section 905.3 sets where standpipes are required, and Section 905.2 states that standpipe system design and installation must comply with NFPA 14. That standard addresses classes of standpipe systems, pipe sizing, hose connections and water supply requirements.

Question 46Codes and Standards

The frontage increase permitted by IBC Section 506.3 for a building with open frontage on a public way is limited to a maximum of what percentage of the tabular allowable area?

  1. 25 percent
  2. 50 percent
  3. 100 percent
  4. 75 percent Correct answer.

Explanation

IBC Section 506.3 computes the frontage increase using If = (F/P - 0.25) x W/30, where F/P is the open frontage fraction and W is the width factor. Because F/P cannot exceed 1 and W is capped at 30 feet, the increase cannot exceed 75 percent of the tabular allowable area.

Question 47Codes and Standards

The seismic design category of a building is determined from:

  1. Risk category, site class and mapped spectral accelerations Correct answer.
  2. The wind speed and exposure category at the building site
  3. The type of construction and the required fire-resistance rating
  4. The building's occupancy group and the number of stories above grade plane

Explanation

IBC Section 1613.2 adopts ASCE 7 procedures, under which the seismic design category follows from the risk category, the site class and the mapped spectral response accelerations Ss and S1. The category then governs the analysis procedure, detailing and bracing requirements.

Question 48Codes and Standards

A mezzanine may be treated as part of the floor below for purposes of occupant load and building area where its aggregate area does not exceed what portion of the floor area of the room or space in which it is located?

  1. One-third Correct answer.
  2. Two-thirds
  3. One-quarter
  4. One-half

Explanation

IBC Section 505.2 permits mezzanines to be treated as part of the story below where the aggregate mezzanine area does not exceed one-third of the floor area of the room or space, the mezzanine is open to that space, and egress requirements are satisfied.

Question 49Codes and Standards

An accessory occupancy may be classified as part of the primary occupancy where its area does not exceed what percentage of the floor area of the story?

  1. 10 percent Correct answer.
  2. 5 percent
  3. 15 percent
  4. 25 percent

Explanation

IBC Section 508.2 permits accessory occupancies to be classified as part of the primary occupancy where the accessory space does not exceed 10 percent of the floor area of the story and does not contain a Group H occupancy. The space must also be ancillary to the primary use.

Question 50Codes and Standards

Smoke control systems required by the International Building Code must be designed and installed in accordance with which standard?

  1. NFPA 13
  2. NFPA 72
  3. NFPA 92 Correct answer.
  4. NFPA 90A

Explanation

IBC Section 909 governs smoke control systems, and Section 909.3 requires their design, installation, testing and maintenance in accordance with NFPA 92. The standard addresses both zoned smoke control and stairwell pressurization methods.