Roofs, Staircases, Plaster & Screed is one of 9 topics in the Grade 12 Civil Technology CAPS syllabus, covered across 3 lessons on Study Vault. Below are real practice questions from this topic with full worked answers.
Sample practice questions
Easy
1. What is a roof truss?
A prefabricated triangulated timber (or steel) structural frame that spans between supporting walls to carry the roof covering
A type of plaster finish applied to walls
A single flat sheet of roof covering material
A machine used to compact concrete floors
Answer: A prefabricated triangulated timber (or steel) structural frame that spans between supporting walls to carry the roof covering — A roof truss is a prefabricated triangulated frame that spans between supporting walls, carrying the roof covering and its loads down to the wall plate.
Easy
2. What is the main purpose of roof underlay, laid over the trusses before the roof covering is fixed?
To provide an additional barrier against wind-driven rain, dust and condensation reaching the roof space
To replace the need for a roof covering entirely
To provide the main structural support for the roof
To colour the underside of the roof covering
Answer: To provide an additional barrier against wind-driven rain, dust and condensation reaching the roof space — Roof underlay is a breathable membrane that provides an additional weatherproofing barrier beyond what the roof covering alone provides.
Medium
3. Name the truss type that uses a single central vertical post running from the ridge down to the tie beam to prevent it from sagging.
Answer: king post roof — A king post roof truss uses a single central vertical post (the king post) to support the tie beam and prevent it from sagging.
