Ferrous Metals & Corrosion Protection is one of 9 topics in the Grade 10 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. Why is mild steel the most commonly used structural metal in farm construction and fabrication?
It combines good strength with useful ductility, allowing it to be bent, welded and shaped without becoming brittle
It is the hardest metal available for any farm application
It never requires any corrosion protection
It cannot be welded under any circumstances
Answer: It combines good strength with useful ductility, allowing it to be bent, welded and shaped without becoming brittle — Mild steel's low carbon content gives it good strength combined with useful ductility, meaning it can be bent, welded and shaped without becoming brittle, making it the most commonly used structural farm metal.
Easy
2. Which mild steel section is L-shaped and widely used for framing and bracing because it resists bending in two directions at once?
Angle iron
Round bar
Square tubing
Purlin
Answer: Angle iron — Angle iron is an L-shaped steel section widely used for framing, bracing and general fabrication, since its shape resists bending in two directions at once.
Medium
3. Name the horizontal structural member that runs along a roof, fixed across trusses or rafters, to which roof covering is directly fastened.
Answer: purlin — A purlin is a horizontal structural member that runs along the length of a roof, fixed across the roof trusses or rafters, to which the roof covering is directly fastened.
