Civil Engineering
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50 free Civil Engineering trivia questions with answers — science & nature quiz, new questions added Oct 2026.
Civil engineering is the reason water comes out of the tap, the road reaches your door and the bridge is still standing after a century of traffic. It is one of the oldest professions that builds things, and its history is full of good stories: towers that tilted, tunnels that frightened governments, and whole rivers persuaded to run the other way. This quiz covers the subject by topic. There are questions on structures and how they fail, on concrete, steel and the ground beneath them, on dams, canals, sewers and clean water, on roads, railways and runways, and on surveying. Others are about the engineers themselves and the landmark projects that made their names. It is written for students preparing for a quiz contest, for working engineers who fancy testing themselves, and for anyone curious about how the built world holds together. Every answer comes with a short explanation.
30 of 50 questions with answers and explanations. Play the quiz
Q 01Civil engineering got its name in the 18th century to set it apart from which older kind of engineering?
Military
Military engineering is the only branch considered older than civil engineering. In Britain the army trained its engineers at Woolwich, while King's College London opened a civil engineering class in 1838.
Q 02Army doctor William Gorgas made the Panama Canal buildable by waging war on which disease-carrying insect?
Mosquitoes
Mosquitoes spread the yellow fever and malaria that threatened the canal's workforce. Gorgas had already used the same methods in Havana, where draining their breeding ponds cut yellow fever cases to zero within a year.
Q 03The 22-yard surveyor's chain devised by Edmund Gunter in 1620 matches the length of which sports feature?
A cricket pitch
A cricket pitch is exactly one chain long, a relic of the days when land was measured with Gunter's 100-link chain. Ten square chains made an acre, which turned farm surveys into simple arithmetic.
Q 04Which US city reversed the flow of its river in 1900 so that sewage no longer drained into its drinking water?
Chicago
Chicago dug a 28-mile canal that made its river flow out of Lake Michigan instead of into it. The diluted sewage now ran inland, down the Des Plaines and Illinois rivers towards the Mississippi.
Q 05The Leaning Tower of Pisa began to tilt during its 12th-century construction because of what?
Soft ground
Soft ground beneath a foundation just three metres deep let the tower sink on one side. Remedial work between 1993 and 2001, which included 870 tonnes of lead counterweights, finally stabilised it.
Q 06Which Egyptian temples were taken apart in blocks and rebuilt on higher ground in the 1960s to escape a new reservoir?
Abu Simbel
Abu Simbel was rebuilt 65 metres higher by 1968, clear of the lake filling behind the Aswan High Dam. Workers first injected epoxy resin into the fragile sandstone so the blocks would survive the lift.
Q 07Builders of which San Francisco landmark formed the Half Way to Hell Club after a safety net broke their falls?
Golden Gate Bridge
The Golden Gate Bridge had movable netting slung beneath its crews at the insistence of chief engineer Joseph Strauss, and it saved nineteen men. Ten others died when a falling scaffold tore through it in 1937.
Q 08Which Renaissance artist is credited with inventing the V-shaped mitre gates still used on canal locks?
Leonardo da Vinci
Leonardo da Vinci devised them in the late 15th century. The two leaves close at an angle like a shallow arch, so the pressure of the water on the upstream side holds them shut.
Q 09Percy Shaw's 1934 invention, a reflective stud set into the road surface, is known in Britain by what animal name?
Cat's eye
The cat's eye cleans itself: a passing tyre presses its reflectors down past a fixed rubber wiper. Shaw patented the design in 1934 and set up a company in Halifax the next year to make it.
Q 10Which Colorado River dam was officially called Boulder Dam from 1933 until Congress changed it back in 1947?
Hoover Dam
Hoover Dam was poured as separate blocks laced with steel pipes that carried ice-cold water from a refrigeration plant. Concrete heats up as it cures, and one solid mass would have cracked as it cooled unevenly.
Q 11An early Channel Tunnel project was abandoned in 1883 because Britain's armed forces feared it would become what?
An invasion route
An invasion route under the sea alarmed the generals enough to stop the boring machines after more than a mile of digging. The tunnel finally opened in 1994, linking Folkestone with Coquelles in northern France.
Q 12Which French engineer designed the internal framework of the Statue of Liberty and the Garabit railway viaduct?
Gustave Eiffel
Gustave Eiffel was called in by the sculptor Auguste Bartholdi in 1881 and devised a four-legged pylon to carry the statue's copper skin. His tower for the 1889 Paris exposition came later.
Q 13Which building in Rome, nearly two thousand years old, still has the world's largest unreinforced concrete dome?
Q 21William Mulholland's 1913 aqueduct carried water from the Owens Valley by gravity alone to which California city?
Los Angeles
Los Angeles took so much water that the Owens Valley ceased to be a viable farming community. The aqueduct needs no pumps and even generates electricity on its way downhill.
Q 22Which country's Zuiderzee Works dammed a shallow inlet of the North Sea and drained part of it to create a new province?
Netherlands
The Netherlands sealed off the Zuiderzee in 1932, two years ahead of forecast, and kept draining polders until the new province of Flevoland was created in 1986.
Q 23What is the name of the structure that releases surplus water from a reservoir so the dam is never overtopped?
Spillway
The Pantheon
The Pantheon's dome measures 43 metres across, exactly the height from the floor to the open oculus at its top, so a perfect sphere would fit inside the hall.
Q 14Which river is spanned by China's Three Gorges Dam, whose reservoir displaced more than a million people?
Yangtze
The Yangtze dam was first proposed by Sun Yat-sen in 1919. Planners expected its reservoir to flood all or part of 13 cities, 140 towns and 1,350 villages.
Q 15Which New York skyscraper was structurally complete just 410 days after work began and opened in 1931?
Empire State Building
The Empire State Building was finished twelve days ahead of schedule. It was the first building with more than 100 storeys and stayed the world's tallest until the World Trade Center was topped out in 1970.
Q 16Which landmark, built by a Canadian railway company, was the world's tallest free-standing structure from 1975 to 2007?
CN Tower
The CN Tower takes its name from Canadian National, the railway that built it. A Sikorsky Skycrane helicopter nicknamed Olga flew its antenna up in 36 sections, saving months of work.
Q 17What is the usual name for the ribbed steel rods cast inside concrete to help it resist stretching forces?
Rebar
Rebar works because steel and concrete expand at almost the same rate as the temperature changes, so the two never pull apart. The ribs on each bar help it grip.
Q 18Galvanized steel is protected from rust by a thin coating of which metal?
Zinc
Zinc keeps protecting the steel even where the coating is scratched through, because it corrodes in place of the exposed metal. The usual method is to dip the finished part in a molten bath.
Q 19Which chemical element has been added to drinking water since the early 1900s to kill cholera and typhoid germs?
Chlorine
Chlorine first treated a whole town's supply at Maidstone, England, in 1897. Permanent dosing began in Lincoln in 1905, after a faulty sand filter let a typhoid epidemic take hold.
Q 20Which US president, impressed by Germany's wartime autobahns, signed the 1956 act creating the Interstate highways?
Dwight D. Eisenhower
Dwight D. Eisenhower had also crossed America in a 1919 Army convoy that took 62 days to reach San Francisco, slowed by poor bridges and engines clogged with desert sand.
A spillway can be a simple chute down the face of the dam or a giant funnel standing in the reservoir. The funnel kind is nicknamed the morning glory, after the flower it resembles.
Q 24What are the long columns of timber, steel or concrete driven deep into the ground to carry a building's weight called?
Piles
Piles of timber have held up Venice since the city began, and the Royal Palace of Amsterdam still rests on 13,659 of them, preserved because they sit below the groundwater level.
Q 25Which Victorian engineer built the Great Western Railway on a 7-foot gauge and designed the Clifton Suspension Bridge?
Isambard Kingdom Brunel
Isambard Kingdom Brunel believed his broad gauge would run better at high speed, but the railway's directors found it no better than the standard one. The Clifton bridge was completed only after his death.
Q 26Which Scottish engineer gave his name to a road surface made of compacted layers of small crushed stone?
John McAdam
John McAdam, surveyor to the Bristol Turnpike Trust from 1816, raised his roads above the surrounding ground so that rain drained away. Binding the stones with tar came later and gave us the word tarmac.
Q 27Which surveying instrument uses a rotating telescope to measure angles in both the horizontal and vertical planes?
Theodolite
Theodolite first appears as a word in a 1571 surveying textbook by Leonard Digges, who applied it to an instrument that measured horizontal angles only.
Q 28Canadian engineers receive what item, worn on the little finger, in a ritual written by Rudyard Kipling?
An iron ring
An iron ring is a reminder of the profession's obligations and ethics, though many are now made of stainless steel. A persistent myth says the first batch was forged from the collapsed Quebec Bridge.
Q 29The number painted at the end of an airport runway is taken from which measurement?
Its compass heading
Its compass heading, counted in tens of degrees, gives each runway a number from 01 to 36. Runways are occasionally renumbered because the Earth's magnetic field slowly drifts.
Q 30What do engineers call the sand, gravel and crushed stone bound together by cement in concrete?
Aggregate
Aggregate is the most mined material in the world. Crushed recycled concrete is now used for it as well as natural sand, gravel and stone.