The most difficult nuclear power riddles A list of nuclear power related questions that are most often answered incorrectly Technology quiz What is the main reason to use nuclear reactor on a submarine?It needs no oxygen. Nuclear reactor requires no oxygen for combustion and emits no exhaust gas. It gives the submarine the ability to operate submerged at high speeds, for unlimited periods, dependent only on the endurance of its crew. Nuclear power revolutionized the submarine, finally making it a true "underwater" vessel, rather than a "submersible" craft.very hard 29% it needs no oxygenit needs no oxygen29%it needs no frequent refuellingit needs no frequent refuelling38%it is silentit is silent28%it is smallit is small2%Created by: Riho Ishii. Statistics based on 5809 answers in 2 languages »submarines riddles » The USS Enterprise is a ship with the largest number of nuclear reactors. How many does she have?8. Most American aircraft carriers are powered by two reactors. The only exception was the early-constructed USS Enterprise, having an eight-reactor propulsion design, with each A2W reactor taking the place of one of the conventional boilers in earlier constructions. Enterprise was meant to be the first of a class of six, but construction costs ballooned and the remaining vessels were never laid down. The design was replaced by two-reactor Nimitz class.very hard 33% 113%2218%4444%8833%Created by: globalquiz.org. Statistics based on 6663 answers in 3 languages »army riddles » Which of the G8 countries is the smallest emitter of carbon dioxide?France. Low carbon dioxide emission in France is a result of large investments in nuclear technology. Most electricity produced by France is generated by 59 nuclear power plants. As a side-effect renewable energies are having difficulty taking off.very hard 34% FranceFrance34%CanadaCanada35%JapanJapan20%RussiaRussia9%Created by: globalquiz.org. Statistics based on 6314 answers in 3 languages »ecology riddles » Apart from power plants, who is the main user of nuclear reactors worldwide?The army. By 1990 there were more nuclear reactors powering ships (mostly military) than there were generating electric power in commercial power plants worldwide (however, marine reactors are much smaller). Many of these submarines and other vessels were decommissioned in the 1990s.very hard 36% hospitalshospitals11%icebreakers fleeticebreakers fleet22%the armythe army36%tokamakstokamaks28%Created by: globalquiz.org. Statistics based on 3847 answers in 3 languages »nuclear energy riddles » Which major European country has no nuclear power plants?Italy is the only G8 country without its own nuclear power plants, having closed its last reactors in 1990. Italy relies heavily on imports and is the world's largest net importer of electricity, mostly from French nuclear power stations. The next nuclear-free economy on the European GDP list is Poland.very hard 39% SpainSpain10%SwedenSweden24%ItalyItaly39%The NetherlandsThe Netherlands25%Created by: Pritam Meitei. Statistics based on 9722 answers in 2 languages »economy riddles » What makes depleted uranium a good material for making ammunition?High density. Depleted uranium is 1.67 times as dense as lead, 84% as dense as osmium or iridium, which are the densest known substances under standard (i.e., Earth-surface) pressures. Consequently a depleted uranium projectile of given mass has a smaller diameter than an equivalent lead projectile, with less aerodynamic drag and deeper (armor-piercing) penetration due to a higher pressure at point of impact.hard 45% radioactivityradioactivity9%high densityhigh density45%explosivenessexplosiveness19%extreme hardnessextreme hardness26%Created by: globalquiz.org. Statistics based on 20607 answers in 2 languages »elements riddles » What is the only continent (except Antarctic) without nuclear power plants?Australia is practically the only developed country not using electricity (indigenous or imported) from nuclear energy. Australia's abundance of cheap coal, conveniently located to population centers, has ruled nuclear energy out of contention on economic grounds. There are nuclear power plants on all other continents, including South America (Brazil, Argentina) and Africa (South Africa).average 65% AsiaAsia2%AfricaAfrica22%South AmericaSouth America10%AustraliaAustralia65%Created by: globalquiz.org. Statistics based on 9564 answers in 3 languages »industry riddles » What is the only physical difference between heavy water and pure water?Heavy water has greater density. Heavy water contains deuterium instead of common hydrogen-1. In its pure form it has a density about 11% greater than water, but otherwise, it is physically and chemically similar. It is not radioactive. Because of greater density and stronger hydrogen-oxygen bonds, its behavior is slightly different in some biochemical reactions. It may be toxic, but only when a large fraction of water (> 50%) in higher organisms is replaced by heavy water.average 66% heavy water has greater densityheavy water has greater density66%heavy water is radioactiveheavy water is radioactive11%heavy water is not translucentheavy water is not translucent9%heavy water conducts electricityheavy water conducts electricity12%Created by: globalquiz.org. Statistics based on 34326 answers in 2 languages »water riddles » United States is the global leader in nuclear power production. Which country takes the second place?France. The present situation is due to the French government deciding in 1974, just after the first oil shock, to expand rapidly the country's nuclear power capacity. This decision was taken in the context of France having substantial heavy engineering expertise but few indigenous energy resources.easy 77% ChinaChina6%JapanJapan8%FranceFrance77%RussiaRussia7%Created by: globalquiz.org. Statistics based on 5590 answers in 3 languages »energy riddles » Play technology quiz and see all the questions.