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The toughest general knowledge quiz questions online — 20 tough questions spanning history, science and geography.
1. What term describes an organism's complete set of genetic material?
💡 A genome is the complete set of DNA, including all genes, present in an organism.
2. Which strait separates the United Kingdom from mainland Europe?
💡 The English Channel separates southern England from northern France, connecting the North Sea to the Atlantic Ocean.
3. Which battle is widely considered the turning point of the American Civil War?
💡 The Battle of Gettysburg in 1863 marked a major turning point, halting the Confederate invasion of the North.
4. What term describes a triangle with one angle greater than 90 degrees?
💡 An obtuse triangle has one interior angle that measures more than 90 degrees.
5. Which empire built the extensive road network known as the 'Royal Road'?
💡 The Persian Empire, under Darius I, constructed the Royal Road to connect its vast territories for trade and communication.
6. Who wrote 'One Hundred Years of Solitude'?
💡 Gabriel Garcia Marquez published this landmark novel of magical realism in 1967.
7. Which scientist discovered the electron?
💡 J.J. Thomson discovered the electron in 1897 through experiments with cathode ray tubes.
8. What term describes a word derived from the name of a real or fictional person?
💡 An eponym is a word formed from a person's name, such as 'sandwich' from the Earl of Sandwich.
9. What is the process by which magma cools and solidifies to form rock called?
💡 Crystallization occurs as molten magma cools, forming mineral crystals that make up igneous rock.
10. What is the boundary between the Earth's crust and mantle called?
💡 The Moho Discontinuity, or Mohorovicic Discontinuity, marks the boundary between the Earth's crust and mantle.
11. What is the theory that the universe began from a single point and has been expanding ever since called?
💡 The Big Bang Theory describes the universe's origin from an extremely hot, dense state roughly 13.8 billion years ago.
12. Which philosopher is known for the statement 'I think, therefore I am'?
💡 Rene Descartes proposed this famous statement, known as the Cogito, as a foundation for certain knowledge.
13. What is the layer of gases surrounding a planet called?
💡 The atmosphere is the layer of gases held around a planet by its gravity, essential for weather and, on Earth, for life.
14. Which ancient library, one of the largest of the ancient world, was located in Egypt?
💡 The Library of Alexandria was one of the largest and most significant libraries of the ancient world, founded in the 3rd century BC.
15. Which country is considered the birthplace of tea-drinking culture?
💡 China has one of the oldest tea-drinking traditions, dating back thousands of years.
16. Which mathematician is known for the Pythagorean theorem?
💡 Pythagoras, an ancient Greek mathematician, is credited with the theorem relating the sides of a right triangle.
17. What was the capital of the ancient Byzantine Empire?
💡 Constantinople, now Istanbul, served as the capital of the Byzantine Empire for over a thousand years.
18. Which compound gives Mars its distinctive reddish appearance?
💡 Mars appears red due to iron oxide, commonly known as rust, covering much of its surface.
19. What term describes a disease outbreak that spreads across multiple countries or continents?
💡 A pandemic is a disease outbreak that spreads across a wide geographic area, affecting multiple countries or continents.
20. Which country was the first to industrialize during the Industrial Revolution?
💡 The United Kingdom was the birthplace of the Industrial Revolution in the late 18th century.