General Knowledge True/False QuizOnline version Test your science and world facts. by ABDELGHANI IKKENE 1 Gold is lighter than water. Sí No 2 Humans only use 10% of their brain. Sí No 3 The Great Wall of China is visible from the Moon. Sí No 4 Paris is the capital of France. Sí No 5 There are 25 hours in a day. Sí No 6 Water boils at 100°C at sea level. Sí No 7 The Earth orbits the Sun once a year. Sí No 8 Humans have 206 bones in an adult. Sí No 9 Bats are completely blind. Sí No 10 Light travels about 299,792 kilometers per second in vacuum. Sí No