What is the smallest country in the world by land area? A) Monaco B) Nauru C) Vatican City D) San Marino Correct Option: C) Vatican City 3. Which element has the chemical symbol 'O'? A) Gold B) Silver C) Oxygen D) Iron Correct Option: C) Oxygen 4. Who painted the famous "Mona Lisa"? A) Vincent van Gogh B) Pablo Picasso C) Leonardo da Vinci D) Michelangelo Correct Option: C) Leonardo da Vinci 5. Which is the longest river in the world? A) Amazon River B) Nile River C) Yangtze River D) Mississippi River Correct Option: B) Nile River 6. In which year did the Titanic sink? A) 1912 B) 1905 C) 1920 D) 1898 Correct Option: A) 1912 7. What is the hardest natural substance on Earth? A) Gold B) Iron C) Diamond D) Platinum Correct Option: C) Diamond 8. Which country is known as the "Land of the Rising Sun"? A) China B) Thailand C) Japan D) South Korea Correct Option: C) Japan 9. How many bones are there in an adult human body? A) 210 B) 206 C) 195 D) 201 Correct Option: B) 206 10. Which is the largest ocean on Earth? A) Atlantic Ocean B) Indian Ocean C) Arctic Ocean D) Pacific Ocean Correct Option: D) Pacific Ocean