Chernobyl Trivia
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129 free Chernobyl trivia questions with answers — history quiz, new questions added Oct 2026.
Chernobyl trivia for history buffs, science readers and everyone who binge-watched the HBO miniseries and then fell down the Wikipedia rabbit hole. This quiz walks through the night of 26 April 1986: the botched turbine test at reactor 4, xenon poisoning, the AZ-5 button and the graphite-tipped control rods, and the design flaws that turned an emergency shutdown into a steam explosion. It then covers the response and the aftermath: the firefighters and the 600,000 liquidators, the helicopters dropping sand and boron, the three men who drained the bubbler pools, the miners under the reactor, Valery Legasov's report in Vienna and his death two years later, the evacuation of Pripyat and its never-opened Ferris wheel, the Red Forest, the Elephant's Foot, the sarcophagus and the arch that now covers it. It closes with the exclusion zone's wildlife and tourists, the 2022 Russian occupation and the making of the 2019 miniseries. Questions range from easy to expert, and every answer was checked against a reference page and carries its source. If you enjoy this quiz, try our Cold War, Soviet Union and nuclear science quizzes next.
30 of 129 questions with answers and explanations. Play the quiz
Q 01In 2019 scientists turned grain grown in Chernobyl's exclusion zone into which drink, branded Atomik?
Vodka
Vodka: distilling left the radioactivity behind in the waste, so the spirit came out no more radioactive than any other, and its makers meant the profits to help communities around the zone.
Q 02In 2011 Ukraine officially opened the Chernobyl exclusion zone to which group?
Tourists
Tourists: Ukraine declared the zone an official attraction in 2011 and visits peaked in 2019, but the Russian invasion of 2022 closed it to visitors again.
Q 03Besides Chernobyl, which accident is the only other rated Level 7, the top of the International Nuclear Event Scale?
Fukushima
Fukushima: Japan first gave its 2011 accident a lower rating, then raised it to the maximum a month later, once the size of the early releases became clear.
Q 04The Chernobyl explosion came during a safety test that simulated what kind of emergency?
A station blackout
A station blackout: engineers wanted to know whether the turbine, still spinning as it coasted down, could keep the coolant pumps running until the diesel generators took over.
Q 05Unlike most Western reactors, Chernobyl's reactor lacked which safety feature?
A containment building
A containment building: the core sat in a concrete-lined cavity under a 1,000-tonne lid instead of inside a sealed dome, so when the lid blew off its contents went straight into the open air.
Q 06In Chernobyl's RBMK reactor, what did steam bubbles forming in the cooling water do?
Increased core reactivity
Steam bubbles increased core reactivity: in an RBMK the water absorbed more neutrons than it moderated, so boiling removed an absorber and power rose, the flaw known as a positive void coefficient.
Q 07Which fission by-product 'poisoned' Chernobyl's reactor, keeping power far below the level the test plan required?
Xenon-135
Xenon-135, a strong neutron absorber, accumulates when power falls; after the reactor slumped to about 30 MW thermal, it held output far below the 700 MW the test plan required.
Q 08What was the name of the emergency shutdown button pressed seconds before Chernobyl's reactor exploded?
AZ-5
AZ-5 was the RBMK's emergency protection button; pressing it drove every control rod into the core at once, and within seconds power surged instead of falling.
Q 09What was on the tip of each RBMK control rod, displacing water and briefly boosting power?
A graphite extension
Each rod ended in a graphite extension, or displacer; as a rod went in, the graphite pushed water out of the channel's lower end first, briefly adding reactivity before the absorber arrived.
Q 10Chernobyl's first explosion was steam; which gas is thought to have fuelled the second, seconds later?
Hydrogen
Hydrogen: steam reacting with the red-hot zirconium cladding of the fuel is thought to have released it, though experts still dispute what the second blast was.
Q 11How soon in Russia's 2022 invasion of Ukraine was the Chernobyl plant seized?
On the first day
On the first day: troops crossing from Belarus on 24 February 2022 took the whole site by evening, and the staff on shift were kept working without a shift change.
Q 12Radiation from Chernobyl was first detected outside the USSR at a nuclear plant in which country?
Sweden
Sweden raised the alarm: on the morning of 28 April workers at a Swedish nuclear plant more than 1,000 km away set off contamination alarms, and by evening Moscow had admitted an accident.
Q 13How did Moscow first announce the Chernobyl accident?
A TV bulletin
Q 21Roughly how many people lived in Pripyat when the city was evacuated after the Chernobyl explosion?
About 49,000
About 49,000 people lived in Pripyat, the plant workers' city; more than a thousand buses emptied it in a few hours on 27 April 1986.
Q 22Pripyat's famous abandoned Ferris wheel had been due to open officially for which holiday?
May Day
May Day: the amusement park was due to open on 1 May 1986, days after the explosion; the city was evacuated first, and the idle wheel became a symbol of the disaster.
Q 23Which purpose-built city replaced Pripyat as home for the plant's workers?
Slavutych
Slavutych was started within months of the accident to rehouse the plant's staff; builders from several Soviet republics each designed a district, named at first after their own capitals.
A TV bulletin: the evening programme Vremya read a few terse sentences saying one reactor was damaged, and the country's leader did not speak publicly about it for another 16 days.
Q 14What was dropped from helicopters onto the burning reactor in the days after the explosion?
Sand, lead, clay and boron
Helicopter crews dropped some 5,000 tonnes of sand, lead, clay and boron onto the ruin in the ten days after the blast; later analysis suggested very little of it reached the core.
Q 15Three engineers waded through flooded corridors to open valves and drain what beneath Chernobyl's reactor?
The bubbler pools
The three engineers drained the bubbler pools, the pressure-suppression pools beneath the reactor; officials feared molten corium reaching that water would trigger a steam explosion, but it dripped in harmlessly.
Q 16Coal miners dug a tunnel under Chernobyl's ruined reactor to make room for what?
A cooling system
The miners dug the chamber for a cooling system meant to stop the melt reaching the groundwater; it was later judged unnecessary and the space was filled with concrete.
Q 17What name was given to the clean-up workers sent to deal with the Chernobyl disaster?
Liquidators
Liquidators were the soldiers, reservists, miners and pilots sent to contain the disaster; many worked with inadequate protective gear and took high doses of radiation.
Q 18A 2023 genetic study examined which animals at the Chernobyl plant, thought to descend from pets abandoned in 1986?
Dogs
Dogs: squads were sent to shoot the pets left behind in the evacuation, but some escaped and clean-up workers fed them; the hundreds around the plant are thought to be their descendants.
Q 19What happened to the Chernobyl commission's leading scientist the day after the disaster's second anniversary?
He took his own life
He took his own life: Valery Legasov left taped memoirs on the accident and the reactor's flaws, and extracts were published within weeks of his death.
Q 20Firefighters at Chernobyl described the intense radiation as tasting like what?
Metal
Metal: firefighters spoke of a metallic taste and pins and needles on the face, and people in nearby Pripyat noticed the same taste before anyone had told them of the accident.
Q 24The pine woodland near the Chernobyl plant whose trees died after absorbing high levels of radiation became known as what?
The Red Forest
The Red Forest takes its name from the ginger-brown colour its pines turned as they died after soaking up the heaviest fallout.
Q 25What is Chernobyl's 'Elephant's Foot'?
A mass of solidified corium under the reactor
The Elephant's Foot is a mass of solidified corium under the reactor: molten fuel that mixed with concrete and sand, flowed down and set in wrinkled folds like an elephant's skin.
Q 26Which rock star wrote the 1987 song 'Time Will Crawl' after hearing news of the Chernobyl disaster?
David Bowie
David Bowie was in Switzerland, taking a break from recording, when he heard of the accident; the song that came of it is about the planet's destruction by pollution and industry.
Q 27Which two isotopes from Chernobyl were most responsible for radiation doses to the general population?
Iodine-131 and caesium-137
Iodine-131 and caesium-137: the short-lived iodine drove the surge in childhood thyroid cancers, while the caesium, with a half-life of 30 years, is the reason the land stays contaminated.
Q 28Chernobyl fallout led to 26 years of movement restrictions on which British farm animals?
Sheep
Sheep: fallout settled on upland pastures in Wales, Cumbria and Scotland, so animals had to be tested before sale until the last farms were released in 2012.
Q 29By 2005, roughly how many thyroid cancers had been found in people exposed to Chernobyl fallout as children?
6,000
More than 6,000 thyroid cancers had been diagnosed by 2005 among people who were children or adolescents in 1986, yet the disease proved so treatable that only fifteen of them had died.
Q 30How many plant workers and firefighters died of acute radiation sickness within months of the Chernobyl accident?
28
28: of 134 workers and firefighters with confirmed acute radiation syndrome, 28 died within about three months; the far larger tolls quoted for Chernobyl are projections of later cancers.