Structural Materials for Farm Structures is one of 9 topics in the Grade 12 Agricultural 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 an alloy?
A metal formed by combining two or more elements, at least one of which is a metal
A purely synthetic material with no metal content
A type of plastic used in irrigation piping
A coating applied only to wood
Answer: A metal formed by combining two or more elements, at least one of which is a metal — An alloy is a metal formed by combining two or more elements, at least one of which is a metal, to produce properties superior to the pure metals alone.
Easy
2. Which alloy is coated with zinc to provide sacrificial corrosion protection to the steel underneath?
Galvanised steel
Stainless steel
High-carbon steel
Mild steel
Answer: Galvanised steel — Galvanised steel is ordinary steel coated with zinc, which corrodes preferentially to protect the underlying steel through sacrificial protection.
Medium
3. Name the alloy of iron with a significant percentage of chromium that forms a self-repairing oxide layer resisting corrosion.
Answer: stainless steel — Stainless steel is an alloy of iron with at least 10,5% chromium, forming a thin, self-repairing oxide layer that resists corrosion.
