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Step it up! 63 medium-difficulty general knowledge questions across science, history, geography and more. A satisfying challenge for curious minds.
1. How many bones does an adult human body have?
💡 An adult human has 206 bones. Babies start with around 270-300, which fuse as they grow.
2. Who invented the telephone?
💡 Alexander Graham Bell is credited with inventing the telephone in 1876.
3. What is the capital of Australia?
💡 Canberra is the capital city of Australia, chosen as a compromise between Sydney and Melbourne.
4. What is the hardest natural substance on Earth?
💡 Diamond scores 10 on the Mohs hardness scale — the highest of any natural mineral.
5. Which is the longest river in the world?
💡 The Nile River is approximately 6,650 km long and flows through northeastern Africa.
6. Which country has the largest population?
💡 China has a population of over 1.4 billion people, the largest of any country.
7. What is the speed of light approximately?
💡 Light travels at approximately 299,792 km/s in a vacuum.
8. What is the chemical symbol for water?
💡 Water consists of 2 hydrogen atoms and 1 oxygen atom — hence H₂O.
9. What gas do humans exhale when breathing out?
💡 Humans exhale carbon dioxide (CO₂) as a waste product of cellular respiration.
10. What is the most spoken language in the world by native speakers?
💡 Mandarin Chinese has approximately 920 million native speakers — the most of any language.
11. What gas do plants absorb from the air?
💡 Plants absorb CO₂ during photosynthesis and release oxygen as a byproduct.
12. How many planets are in our solar system?
💡 There are 8 planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.
13. Which is the smallest ocean in the world?
💡 The Arctic Ocean is the smallest and shallowest of the five world oceans.
14. How many strings does a standard guitar have?
💡 A standard guitar has 6 strings, tuned E-A-D-G-B-E from low to high.
15. How many colors are in a rainbow?
💡 A rainbow displays 7 colors: red, orange, yellow, green, blue, indigo, and violet.