Abrasives: sandpaper grits and materials

What this quiz covers

From rough stock removal to final finishing, abrasives are all about choosing the correct grit and material for the surface in front of you. You’ll see questions on grit numbers, abrasive minerals, backing types, and when to switch grits for efficient, clean results.

Each question uses 4 options and there’s no timer, so you can think through use-cases like wood vs. metal, hand sanding vs. power sanding, and dry vs. wet sanding.

Skills you’ll practice

You’ll practice translating grit ranges into real outcomes (flattening, shaping, smoothing, polishing) and selecting the right abrasive for the tool and substrate. You can also choose your question count and difficulty before starting, so it’s easy to do a quick refresher or a deeper mixed run.

• Picking grit progressions that remove scratches efficiently
• Matching abrasive minerals (e.g., aluminum oxide, silicon carbide) to materials
• Choosing backing types (paper/cloth/film/mesh) for durability and finish quality
• Knowing when wet sanding helps and when it causes problems
• Identifying when “finer” isn’t better (loading, burnishing, slow cutting)

Common pitfalls and how difficulty is balanced

A frequent mistake is jumping too many grits, which leaves deep scratches that show up after finish or paint. Another is using the wrong abrasive/backing for the tool, leading to premature wear, clogged paper, heat buildup, or swirl marks.

Difficulty is mixed on purpose: easier questions reinforce grit basics and typical progressions, while harder ones test edge cases like specialty abrasives, backing choices, and surface-specific best practices. If you want a smoother ramp, lower the difficulty; if you want a challenge, raise it and increase the question count.