Orthographic Projection: Civil Drawing is one of 9 topics in the Grade 11 Engineering Graphics and Design 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 floor plan, in terms of orthographic projection?
A horizontal sectional view of a building, as if a cutting plane sliced through the walls and the portion above were lifted away
A vertical external view of one side of a building
A pictorial 3D view of the entire building
A diagram showing only the building's roof
Answer: A horizontal sectional view of a building, as if a cutting plane sliced through the walls and the portion above were lifted away — A floor plan is a horizontal sectional view, produced as if a horizontal cutting plane sliced through the walls and the portion above the cut were lifted away, looking down onto the rooms below.
Easy
2. Which projection system is Grade 11 civil drawing set in?
First-angle
Third-angle
Both equally
Neither; civil drawing uses no formal projection system
Answer: First-angle — Grade 11 civil drawing content is set in first-angle orthographic projection, matching South African civil/building drawing convention.
Medium
3. Name the drawing scale commonly used for a Grade 11 floor plan (give ONE valid example ratio).
Answer: 1:100 — Floor plans commonly use a reduction scale such as 1:100 or 1:50, since a building is far too large to draw at full size.
