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Sample BPC/VBA Domestic Builder (Unlimited) Exam Practice Questions
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1Under the National Construction Code (NCC), which building class typically covers a detached single dwelling used as a residence?
A.Class 1a
B.Class 2
C.Class 5
D.Class 9b
Explanation: NCC Class 1a covers a single dwelling being a detached house, or one or more attached dwellings separated by a fire-resisting wall (such as a townhouse). Class 2 covers apartments; Class 5 offices; Class 9b assembly buildings. Domestic Builder (Unlimited) work centres on Class 1 and related Class 10 buildings.
2Which NCC building class covers a non-habitable building such as a private garage, carport or shed associated with a dwelling?
A.Class 1b
B.Class 10a
C.Class 7a
D.Class 3
Explanation: Class 10a covers a non-habitable building being a private garage, carport, shed or the like. (Fences, masts and similar structures are Class 10b, not 10a.) Class 10 structures commonly accompany Class 1 dwellings and are within Domestic Builder (Unlimited) scope when associated with residential work.
3NCC Volume Two primarily sets Performance Requirements and Deemed-to-Satisfy pathways for which buildings?
A.Class 2 to 9 commercial buildings only
B.Plumbing and drainage systems only
C.Class 1 and Class 10 buildings (Housing Provisions)
D.High-rise Class 2 apartments only
Explanation: NCC Volume Two addresses Class 1 and Class 10 buildings and works with the ABCB Housing Provisions Standard for Deemed-to-Satisfy detail. Volume One covers Class 2–9; Volume Three covers plumbing. Victorian domestic builders must be fluent in Volume Two for houses and associated Class 10 structures.
4For stairs other than spiral stairs in Class 1 and 10 buildings, what is the maximum riser (R) height permitted under the ABCB Housing Provisions (NCC 2022)?
A.115 mm
B.240 mm
C.355 mm
D.190 mm
Explanation: Table 11.2.2a of the Housing Provisions sets riser (R) for stairs other than spiral between a minimum of 115 mm and a maximum of 190 mm. Exceeding 190 mm creates a trip hazard on ascent and is a common compliance failure on domestic stairs.
5For stairs other than spiral stairs serving Class 1 and 10 buildings, what is the minimum going (G) required by the Housing Provisions?
A.240 mm
B.190 mm
C.115 mm
D.550 mm
Explanation: The minimum going for non-spiral stairs is 240 mm, with a maximum of 355 mm. Adequate going reduces the risk of overstepping when descending. The slope relationship 2R+G must also stay between 550 mm and 700 mm.
6How many risers may a single flight of stairs contain under Housing Provisions clause 11.2.2 for Class 1 and 10 buildings?
A.Not more than 12 and not less than 3
B.Not more than 18 and not less than 2
C.Not more than 24 with no minimum
D.Any number if a handrail is fitted
Explanation: A stairway must have not more than 18 and not less than 2 risers in each flight. Eighteen is treated as the maximum reasonable number before a rest landing; fewer than two risers is not treated as a stairway for NCC purposes.
7Open risers are permitted on Class 1/10 stairs provided the opening between treads does not exceed which dimension?
A.100 mm
B.150 mm
C.125 mm
D.200 mm
Explanation: Housing Provisions limit openings in open risers to 125 mm to reduce the chance of a young child falling through or becoming trapped. Builders must check fabricated metal and timber open-riser stairs against this limit.
8Which Performance Requirement theme in NCC Volume Two addresses weatherproofing, rising damp and rainwater management for Class 1 and 10 buildings?
A.Safe movement and access
B.Energy efficiency
C.Fire safety of exits only
D.Damp and weatherproofing
Explanation: Damp and waterproofing / weatherproofing Performance Requirements cover rainwater management, weatherproofing of external envelopes, rising damp and related moisture control. Domestic builders must deliver roofs, walls, flashings and damp-proof courses that meet these outcomes.
9Smoke alarms in a new Class 1a dwelling must generally be interconnected and located so that they provide early warning to sleeping occupants. Which document provides the primary Deemed-to-Satisfy pathway for residential smoke alarms in Volume Two?
A.The ABCB Housing Provisions fire-safety provisions referenced by NCC Volume Two
B.AS/NZS 3000 Wiring Rules alone without NCC
C.AS 2870 Residential slabs and footings
D.The Domestic Building Contracts Act 1995
Explanation: NCC Volume Two and the Housing Provisions set smoke-alarm Deemed-to-Satisfy requirements for Class 1 buildings (locations, interconnection and power supply). AS/NZS 3000 covers electrical installation of the alarms but does not replace the NCC placement rules; AS 2870 and the Contracts Act are unrelated to smoke-alarm layout.
10A room height in a Class 1 habitable room must satisfy Housing Provisions Part 10.3. Which statement best reflects the Deemed-to-Satisfy approach?
A.Any ceiling height is acceptable if the owner agrees in writing
B.Habitable rooms must achieve the minimum ceiling heights set in the Housing Provisions (generally measured to the finished ceiling)
C.Ceiling height is controlled only by AS 1684 span tables
D.Only bathrooms have minimum ceiling heights; living rooms do not
Explanation: Housing Provisions Part 10.3 sets minimum ceiling heights for habitable rooms, kitchens and other spaces. Owner agreement cannot waive NCC Performance Requirements. AS 1684 sizes timber members; it does not set habitable room heights.
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