Graphic Communication & Orthographic Projection is one of 9 topics in the Grade 9 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. Which line type is used to show hidden detail, such as a step hidden behind a handrail?
A dashed line
A dark, thick line
A chain line
A wavy line
Answer: A dashed line — A dashed line represents hidden detail -- an edge or surface that exists but cannot be seen from that particular view.
Easy
2. Which line type is used for the actual visible outlines and edges of an object?
A dark, thick continuous line
A feint, thin line
A chain line
A wavy line
Answer: A dark, thick continuous line — A dark (thick, continuous) line is used for outlines and visible edges -- the edges you would actually see looking at the real object.
Medium
3. Name the line type -- alternating long and short dashes -- used to show the centre of a symmetrical object or a circle.
Answer: chain line — A chain line (alternating long and short dashes) marks a centre line, showing the centre of a symmetrical object, a circle, or a line of symmetry.
