Science Quiz
From the human body to outer space, challenge your scientific knowledge with 50 questions spanning biology, chemistry, physics, and earth science.
Why Science Quizzes Matter
Science is the foundation of how we understand the world — from the atoms that make up everything around us to the galaxies billions of light-years away. A well-crafted science quiz does more than test memorisation; it builds scientific literacy, sparks curiosity, and reinforces concepts that students encounter in school and beyond.
QuizOxa's Science category is one of our most challenging and rewarding. We cover four major branches — biology, chemistry, physics, and space science — with questions that range from fundamental concepts to fascinating details that even experienced science enthusiasts find surprising.
What This Quiz Covers
- Human Biology & Anatomy — The skeletal system (206 bones), major organs, blood types, the nervous system, and how the body works at a cellular level.
- Chemistry — Elements and their symbols (Au for Gold, Fe for Iron), chemical formulas (H₂O, NaCl), the periodic table, and key chemical reactions.
- Physics — Laws of motion, gravity, the speed of light, electromagnetic waves, states of matter, and energy types.
- Space & Astronomy — The solar system, planet facts (Jupiter is largest, Mars is the Red Planet), the Sun, and space exploration milestones.
- Earth Science — The ozone layer, Earth's layers (crust, mantle, core), seismology, meteorology, and climate basics.
- Famous Scientists — Discoveries and contributions by Newton, Einstein, Darwin, Marie Curie, and other pioneers of science.
Difficulty Levels
- 😊 Easy (30 seconds, 100 pts) — Core facts: what H₂O is, the closest star to Earth (the Sun), what organ pumps blood (the heart), and basic photosynthesis.
- 🔥 Medium (20 seconds, 150 pts) — Deeper concepts: DNA full form, chromosome count (46), chemical symbols for gold and iron, and the freezing point of water.
- 💀 Hard (15 seconds, 200 pts) — Expert: organ-specific functions (which organ produces insulin?), the chemical formula for table salt, electromagnetic wave types, and metamorphosis processes.
Sample Questions
Here are 5 sample questions from our Science quiz:
Q1. What is the powerhouse of the cell?
✅ Answer: Mitochondria
Mitochondria produce ATP (adenosine triphosphate) through cellular respiration — the energy currency of the cell.
Q2. Which gas makes up approximately 78% of Earth's atmosphere?
✅ Answer: Nitrogen
Nitrogen is the most abundant gas in our atmosphere, followed by oxygen at about 21%.
Q3. What is the speed of light approximately?
✅ Answer: 300,000 km/s
Light travels at approximately 299,792 km/s in a vacuum — the fastest speed possible in the universe.
Q4. How many bones does the adult human body have?
✅ Answer: 206
Adults have 206 bones. Babies are born with around 270, but many fuse together as they grow.
Q5. What is the hardest natural material on Earth?
✅ Answer: Diamond
Diamond rates 10 on the Mohs hardness scale — the highest possible rating for any natural material.
Who Is This Quiz For?
- Students studying biology, chemistry, or physics at school or university level
- Teachers looking for a quick, engaging classroom activity or revision tool
- Quiz competition participants preparing for science rounds
- Science enthusiasts who enjoy learning new facts about how the world works
- Parents who want an educational screen-time activity for their children
Ready to Test Your Knowledge?
50 questions, 5 unique quizzes, 3 difficulty levels — all completely free.
Related Resources
Every science question is verified against peer-reviewed sources and established scientific literature.