Ten questions on the principles engineers actually rely on, each explained by the force it manages.
Engineering is a small set of ideas about force applied over and over at every scale, from a door handle to a suspension bridge. This quiz covers the simple machines, the geometry that makes structures rigid, the properties that decide which material goes where, and the standardisation that made mass manufacturing possible. It leaves the famous inventors to Inventions That Changed Everything and concentrates on the principles instead. The explanations name the force being managed in each case.
Every question in this quiz is listed below with its correct answer and the reasoning behind it. Play first if you would rather not see the answers — or read through as a study sheet.
Play it insteadAnswer: D. Steel
Why: Concrete is strong under compression but weak under tension, and steel is the reverse. Embedding steel bars gives a material that handles both.
Answer: C. Compression
Why: The curve redirects downward load outward and into the supports as compression. This is why stone, strong in compression, works so well for arches.
Answer: C. Cables hanging from towers
Why: Main cables run over the towers and down to anchorages, with vertical hangers carrying the deck. The arrangement allows very long spans with little underneath.
Answer: C. Trading distance for force
Why: Moving the effort further from the pivot multiplies force while requiring a longer movement. No energy is created; it is simply applied differently.
Answer: B. The triangle
Why: A triangle cannot deform without changing the length of a side, so it holds its shape. A square frame can collapse into a parallelogram unless braced.
Answer: C. Nearly incompressible
Why: Pressure applied to a confined liquid transmits almost undiminished throughout it. This lets a small force on a small piston lift a large load on a bigger one.
Answer: C. Being pulled apart
Why: Tensile strength describes resistance to stretching forces. Compressive strength, the opposite measure, describes resistance to being squashed.
Answer: C. Spreading the effort over a longer distance
Why: The same work is done, but less force is needed at any moment because the distance is greater. Screws and wedges are inclined planes in another form.
Answer: B. The balance between speed and turning force
Why: Pairing gears of different sizes trades rotational speed against torque. A small gear driving a large one reduces speed and increases force.
Answer: D. Interchangeable parts
Why: Common thread standards meant parts made in different workshops would fit together. Interchangeability underpins mass production and repair.
How Things Are Built has 10 questions and takes about 7 minutes to finish. It is rated Medium and sits in our Inventions & Engineering category.
Each of the 10 correct answers adds 10 XP, up to 100 XP for a clean run. Wrong answers cost you nothing, and your full question-by-question review is shown at the end.
Yes. All 10 questions carry a written explanation of why the correct answer is right, so the quiz works as a study sheet as well as a test.
Yes, as often as you like. The questions and the answer options are reshuffled on each run, and you can use Practice Mistakes afterwards to retry only the ones you missed. No account is needed to play.
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