Vulcanisation improves rubber by doing what?

Linking its long molecules so it stays elastic across a range of temperatures

Aluminium was once more valuable than gold because of what?

It was extremely difficult to separate from its ore

Almost none of it exists in the Earth's crust

It could be mined in only one country

It decayed quickly once exposed to air

Adding a small proportion of carbon to iron produces what?

Steel, which is harder and stronger

Cast iron, which is soft and easily bent

Wrought iron, which cannot be welded

Float glass, developed in the 1950s, produces flat sheets by doing what?

Floating molten glass across a bath of molten tin

Rolling glass between chilled steel drums

Blowing a cylinder and cutting it open flat

Casting glass into polished stone moulds

Silicon underpins the semiconductor industry mainly because of what?

Its conductivity can be tuned precisely by adding trace impurities

It is the hardest element available

It conducts electricity better than copper

It cannot be melted at practical temperatures

Portland cement hardens by which process?

Evaporation of the water in the mix

Absorption of carbon dioxide from the air

Carbon fibre is valued in engineering for which property?

A very high strength-to-weight ratio

Being unable to melt at any temperature

Conducting heat poorly in every direction

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Inventions & Engineering Medium ⚡ 10 Questions ⏱️ ~7 Mins +100 XP

Materials That Made the Modern World

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Engineering advances are often really materials advances. These ten changed what was possible to build, and when.

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About this topic

Design is constrained by what is available, and for most of history very little was. A bridge could only be as long as the strongest available material allowed; a building could only be as tall as its walls could carry. The great shifts in engineering usually trace back to a process that made some substance cheap, or reliable, or workable for the first time. This quiz covers ten of them, from bronze to semiconductor-grade silicon. Several involve no new element at all, only a better way of removing an impurity or arranging a molecule. The explanations note what each material replaced, which is usually the clearest measure of how much it mattered.

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Materials That Made the Modern World: all 10 questions and answers

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1The Bessemer process, introduced in the 1850s, made which material cheap for the first time?
- A Aluminium
- B Window glass
- C Portland cement
- D Steel Correct
Answer: D. Steel

Why: Blowing air through molten iron burned off the excess carbon in minutes rather than days. Rails, ships and framed buildings all followed from the collapse in price.
2Vulcanisation improves rubber by doing what?
- A Making it soluble in water
- B Halving its weight
- C Linking its long molecules so it stays elastic across a range of temperatures Correct
- D Bleaching it to an even colour
Answer: C. Linking its long molecules so it stays elastic across a range of temperatures

Why: Charles Goodyear found the effect of heating rubber with sulphur in the 1830s. Untreated rubber goes sticky in summer heat and brittle in frost.
3Aluminium was once more valuable than gold because of what?
- A It decayed quickly once exposed to air
- B It was extremely difficult to separate from its ore Correct
- C Almost none of it exists in the Earth's crust
- D It could be mined in only one country
Answer: B. It was extremely difficult to separate from its ore

Why: It is one of the most abundant metals in the crust, but always tightly bound to oxygen. Cheap electricity and the Hall-Heroult process made it ordinary from the 1880s.
4Adding a small proportion of carbon to iron produces what?
- A Steel, which is harder and stronger Correct
- B Cast iron, which is soft and easily bent
- C Wrought iron, which cannot be welded
- D Pig iron, which resists rust
Answer: A. Steel, which is harder and stronger

Why: Around one percent by weight is enough to transform how the metal behaves. Rather more carbon than that gives cast iron, strong in compression but brittle under a blow.
5Float glass, developed in the 1950s, produces flat sheets by doing what?
- A Rolling glass between chilled steel drums
- B Blowing a cylinder and cutting it open flat
- C Casting glass into polished stone moulds
- D Floating molten glass across a bath of molten tin Correct
Answer: D. Floating molten glass across a bath of molten tin

Why: Gravity and surface tension give both faces a flat finish with no grinding at all. Before it, plate glass had to be ground and polished at considerable expense.
6Silicon underpins the semiconductor industry mainly because of what?
- A It conducts electricity better than copper
- B It cannot be melted at practical temperatures
- C Its conductivity can be tuned precisely by adding trace impurities Correct
- D It is the hardest element available
Answer: C. Its conductivity can be tuned precisely by adding trace impurities

Why: Adding those trace elements deliberately is called doping, and it sets how easily current flows. Silicon also grows a stable oxide, which makes insulating layers easy to build on the same chip.
7Portland cement hardens by which process?
- A Cooling from a molten state
- B A chemical reaction with water Correct
- C Evaporation of the water in the mix
- D Absorption of carbon dioxide from the air
Answer: B. A chemical reaction with water

Why: Because it is a reaction rather than drying, concrete sets perfectly well underwater. Joseph Aspdin patented the name in 1824, after a building stone the hardened material was said to resemble.
8Nylon's first commercial product, in 1938, was what?
- A Toothbrush bristles Correct
- B Stockings
- C Climbing rope
- D Fishing line
Answer: A. Toothbrush bristles

Why: Stockings followed in 1940 and sold in millions within days of release. Wartime demand then diverted almost the entire supply into parachutes and tyre cord.
9Carbon fibre is valued in engineering for which property?
- A Being unable to melt at any temperature
- B Costing less than steel
- C Conducting heat poorly in every direction
- D A very high strength-to-weight ratio Correct
Answer: D. A very high strength-to-weight ratio

Why: The fibres are set in resin, so the finished part is a composite rather than a pure material. Its stiffness depends on which way the fibres run, which is why the layup pattern is a design decision.
10Bronze is an alloy of copper with which metal?
- A Lead
- B Nickel
- C Tin Correct
- D Zinc
Answer: C. Tin

Why: Brass is the copper and zinc alloy instead. Tin is scarce and unevenly distributed, so Bronze Age societies depended on long-distance trade to get it.

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