# Science Trivia Updated October 9, 2026 Twenty original science questions from the planets to the human body. Test yourself in quiz mode with answers, explanations, and score tracking. From gravity to the chemical symbols, this set covers the science everyone meets in school and in the news. Perfect for students and curious minds alike. **Question 1.** What force pulls objects toward Earth? **Reveal answer Answer:** Gravity Gravity is what gives physical objects their weight. **I got it right I got it wrong Question 2.** What is H2O commonly known as? **Reveal answer Answer:** Water Each water molecule has two hydrogen atoms and one oxygen atom. **I got it right I got it wrong Question 3.** Which planet is closest to the Sun? **Reveal answer Answer:** Mercury Mercury completes an orbit of the Sun in just 88 days. **I got it right I got it wrong Question 4.** What part of the cell contains DNA? **Reveal answer Answer:** The nucleus The nucleus acts as the cell's control center. **I got it right I got it wrong Question 5.** What do we call a scientist who studies stars and planets? **Reveal answer Answer:** An astronomer Astronomy is one of the oldest sciences in human history. **I got it right I got it wrong Question 6.** About how long does sunlight take to reach Earth? **Reveal answer Answer:** About 8 minutes Light travels 150 million kilometers at 300,000 km per second. **I got it right I got it wrong Question 7.** What is the center of an atom called? **Reveal answer Answer:** The nucleus Protons and neutrons are packed into the tiny nucleus. **I got it right I got it wrong Question 8.** Which gas makes up most of Earth's atmosphere? **Reveal answer Answer:** Nitrogen About 78 percent of the air is nitrogen; oxygen is about 21 percent. **I got it right I got it wrong Question 9.** What is the boiling point of water at sea level? **Reveal answer Answer:** 100 degrees Celsius That is 212 Fahrenheit; the boiling point drops at higher altitudes. **I got it right I got it wrong Question 10.** What do we call animals that eat only plants? **Reveal answer Answer:** Herbivores Cows, deer, and rabbits are all herbivores. **I got it right I got it wrong Question 11.** Which blood cells carry oxygen around the body? **Reveal answer Answer:** Red blood cells The protein hemoglobin inside them binds to oxygen. **I got it right I got it wrong Question 12.** What is the largest organ of the human body? **Reveal answer Answer:** The skin An adult's skin covers about 2 square meters. **I got it right I got it wrong Question 13.** How many bones are in the adult human body? **Reveal answer Answer:** 206 Babies are born with about 300 bones, which fuse as they grow. **I got it right I got it wrong Question 14.** What mainly causes ocean tides? **Reveal answer Answer:** The Moon's gravity The Sun's gravity plays a smaller supporting role. **I got it right I got it wrong Question 15.** What is the chemical symbol for gold? **Reveal answer Answer:** Au It comes from aurum, the Latin word for gold. **I got it right I got it wrong Question 16.** Which planet has the most known moons? **Reveal answer Answer:** Saturn Saturn has more than 140 confirmed moons. **I got it right I got it wrong Question 17.** What do we call water falling from clouds? **Reveal answer Answer:** Precipitation Precipitation includes rain, snow, sleet, and hail. **I got it right I got it wrong Question 18.** What unit measures electrical resistance? **Reveal answer Answer:** The ohm It is named after German physicist Georg Ohm. **I got it right I got it wrong Question 19.** Which vitamin does sunlight help your body produce? **Reveal answer Answer:** Vitamin D Skin produces vitamin D when exposed to ultraviolet light. **I got it right I got it wrong Question 20.** What is the study of earthquakes called? **Reveal answer Answer:** Seismology Seismologists measure quakes with instruments called seismographs. I got it right I got it wrong ## Frequently asked questions ### How do I play the quiz? Read each question, say your answer out loud, then press Reveal answer. Mark whether you got it right and move to the next question. Your score is tracked to the end. ### Are these questions suitable for students? Yes. They cover standard school science topics and each answer includes a one-line explanation that reinforces the concept. ### How many questions are in this quiz? 20, each with an answer and a one-line explanation. ### Can I reuse these questions? Yes. All questions are original and free to use for quizzes, classrooms, and trivia nights.