Structural Engineering
0Loading crowd target
0Loading crowd target
6correct to beat the crowd
50 free Structural Engineering trivia questions with answers — science & nature quiz, new questions added Oct 2026.
Every building, bridge and stadium is an argument with gravity, wind and time, and structural engineering is the craft of winning it. The subject mixes simple ideas that anyone can picture, such as pushing, pulling and bending, with stories of daring builders and of the failures that taught the profession its hardest lessons. This quiz covers the forces and terms engineers use every day, the materials that made tall and long structures possible, landmark spans and skyscrapers, and the people behind them. You will also meet the collapses and near-misses that rewrote the rulebooks. It suits engineering students who want a quick test of the basics, professionals after a refresher, and anyone who has looked up at a tower and wondered what holds it there.
30 of 50 questions with answers and explanations. Play the quiz
Q 01Which Washington state span, nicknamed Galloping Gertie, twisted itself apart in a gale four months after opening?
Tacoma Narrows Bridge
The Tacoma Narrows Bridge failed through aeroelastic flutter rather than simple resonance, and the only life lost was a cocker spaniel named Tubby, left in a car on the deck.
Q 02P. T. Barnum marched 21 elephants across which New York crossing in 1884 to show doubters that it was safe?
Brooklyn Bridge
The Brooklyn Bridge was seen through to completion by Emily Warren Roebling, who relayed her bedridden husband's instructions to the engineers on site.
Q 03Which shape is the basic unit of a truss because it cannot be deformed without changing a side's length?
Triangle
The triangle is the simplest figure that will not change shape while its side lengths stay fixed, which is why a bare rectangular frame needs a diagonal brace.
Q 04Which Babylonian king's law code put a builder to death if his house collapsed and killed its owner?
Hammurabi
Hammurabi's code went further still: under the next law, if the collapse killed the owner's son, the builder's own son was to die.
Q 05Ming-dynasty builders strengthened the lime mortar of the Great Wall of China by mixing in which food?
Sticky rice
Sticky rice, boiled to a thick soup, adds a starch called amylopectin that makes lime mortar stronger and more water-resistant.
Q 06Which American monument has an iron skeleton built by Gustave Eiffel, years before his Paris tower?
Statue of Liberty
The Statue of Liberty is an early curtain wall: its thin copper skin carries no load and hangs from the inner frame, as glass does on a modern office block.
Q 07Which external arched support, used at Notre-Dame de Paris, let Gothic cathedral walls be thin and filled with glass?
Flying buttress
The flying buttress carries the sideways thrust of a stone vault out to a separate pier, so the wall itself no longer has to be massive.
Q 08Which California span's roadway sagged flat in 1987 when 300,000 walkers packed it for a 50th anniversary?
Golden Gate Bridge
The Golden Gate Bridge was so jammed by poor crowd control that the weight pulled its normally arched centre span level; up to a million people had turned out.
Q 09After marching soldiers brought down Broughton Suspension Bridge in 1831, the British Army ordered troops to do what?
Break step
Break step, meaning walk out of rhythm: the 74 men had felt the deck bounce in time with their feet and stepped harder for fun until a bolt gave way.
Q 10What struck the Empire State Building in thick fog in July 1945, yet left its steel frame structurally sound?
A military bomber
A military bomber, a B-25 Mitchell diverting in fog, hit the north face; the frame was not compromised and many floors were open for business less than 48 hours later.
Q 11What is the wedge-shaped stone at the very top of a masonry arch, set in place last, called?
Keystone
The keystone locks an arch so that it can stand unaided, yet it carries the least stress of any stone in the ring.
Q 12What is a beam called when it is fixed at one end and free at the other, like the balconies of Fallingwater?
Cantilever
A cantilever sends all its load back to the one fixed support, and bridges are often built from pairs of them reaching out to hold up a central section.
Q 13Which Italian landmark was stabilised by 2001 after engineers dug soil from beneath its raised side?
Leaning Tower of Pisa
Q 21Which kind of stress acts parallel to a cross-section, making internal layers of a material slide past one another?
Shear
Shear arises when forces push one part of a body one way and the neighbouring part the other, which is exactly what a pair of scissor blades does to paper.
Q 22Which term do engineers use for the permanent weight of a structure itself, as opposed to its occupants and furniture?
Dead load
Dead load usually gets a smaller multiplier in design than the changing kind: a staircase might be checked for 1.2 times its own weight but 1.6 times the crowd on it.
Q 23Engineers measure stress in pascals, a unit that expresses force divided by which quantity?
Area
Area is the divisor: one pascal is a single newton spread over a square metre, so small that structural stresses are normally quoted in millions of pascals.
The Leaning Tower of Pisa moved back 45 centimetres, to where it stood in 1838, once 38 cubic metres of earth had been drawn out, and was declared stable for 300 years.
Q 14Which skyscraper lets visitors view its 660-tonne steel ball, a pendulum that swings to steady the tower in high winds?
Taipei 101
Taipei 101's ball is a tuned mass damper: made of 41 welded steel plates, it swings against the building's sway and can be seen from the 88th to the 92nd floor.
Q 15Which American inventor popularised the geodesic dome, patenting it in 1954 and building one for Montreal's Expo 67?
Buckminster Fuller
Buckminster Fuller did not invent the form: a German dome on the roof of the Zeiss works in Jena came some twenty years before he coined the word geodesic.
Q 16Which London footbridge shut days after opening because pedestrians' footsteps made it sway from side to side?
Millennium Bridge
The Millennium Bridge taught engineers something new: people on a swaying deck unconsciously fall into time with it, and 37 fluid dampers had to be fitted to calm it.
Q 17Which Italian city's buildings stand on closely packed tree trunks driven through lagoon mud to a layer of hard clay?
Venice
Venice's builders chose alder, a wood noted for resisting water, and laid slabs of Istrian limestone over the pile heads to carry the walls.
Q 18Sydney Harbour Bridge is held together by about six million of which fasteners, each driven in red-hot by hand?
Rivets
Rivets were the proven choice in 1932 because structural welding was not yet trusted for a job of that size; the largest one weighed 3.5 kg.
Q 19Steel, the backbone of modern structures, is an alloy of iron and a small amount of which element?
Carbon
Carbon makes up no more than about 2% of steel by weight; add more than that and the metal becomes brittle cast iron instead.
Q 20Joseph Paxton's design for the 1851 Crystal Palace grew out of a glasshouse he built for which plant?
A giant water lily
A giant water lily, Victoria amazonica, has leaves so strongly ribbed that Paxton floated his daughter Annie on one to test their strength.
Q 24Which Italian scientist's last book, Two New Sciences, set out an early theory of why beams snap under load?
Galileo Galilei
Galileo Galilei showed in 1638 that a stick across the knee gives way most easily at its middle, and that the ideal beam held at one end tapers in a parabola.
Q 25Roman builders mixed lime with which material from Pozzuoli, near Naples, to make concrete that sets even under water?
Volcanic ash
Volcanic ash, called pozzolana, was shipped in enormous quantities to build the harbour at Caesarea, and it resists salt water better than modern concrete does.
Q 26Joseph Aspdin patented which building material in 1824, naming it after a pale limestone quarried in Dorset?
Portland cement
Portland cement, the binder in almost all modern concrete, got its name because once hardened it resembled the prized stone used for St Paul's Cathedral.
Q 27Which 1850s steelmaking method, blowing air through molten iron, first made steel cheap enough to build with?
Bessemer process
The Bessemer process burned the impurities out of molten pig iron in a blast lasting about 20 minutes, the first inexpensive way to make steel in bulk.
Q 28Which goldsmith won the contest to build Florence Cathedral's dome, then raised it without a timber frame to hold it up?
Filippo Brunelleschi
Filippo Brunelleschi laid the bricks in a herringbone pattern that tied each fresh course to the ribs, since Tuscany did not have enough timber for conventional supports.
Q 29Greek temples and Stonehenge both use which ancient building system of horizontal beams resting on upright supports?
Post and lintel
Post and lintel suits stone badly over wide gaps, because a beam sags in the middle and its underside is pulled apart, the one thing stone resists poorly.
Q 30Which Chicago skyscraper, the world's tallest when it opened in 1973, is built as nine square tubes bundled together?
Willis Tower
Willis Tower, known as the Sears Tower until 2009, is said to have been worked out with nine cigarettes held in a cluster at staggered heights.