General Knowledge
Everyday Science Quiz
Why is the sky blue? Why do onions make you cry? Test your knowledge of the science behind everyday phenomena in this illuminating 50-question quiz.
Why is the sky blue? Why do onions make you cry? Test your knowledge of the science behind everyday phenomena in this illuminating 50-question quiz.
We encounter science every single day without thinking about it. Why does the sky change color at sunset? Why does ice float instead of sink? Why does helium make your voice sound funny? This quiz tackles 50 of those questions we have all wondered about at some point, and the answers are genuinely fascinating.
From Rayleigh scattering painting the sky blue to surfactant molecules in soap lifting grease off your hands, the phenomena tested here span physics, chemistry, and biology. Every answer includes a clear explanation so you walk away understanding the "why" — not just memorizing a fact.
You will discover why cats always land on their feet, why we get brain freeze, why hair turns gray, and dozens more. Each question is designed to be easy enough for anyone to attempt, but the explanations reveal surprising depth behind everyday occurrences.
The sky appears blue because of Rayleigh scattering. Sunlight contains all colors, but shorter blue wavelengths scatter more when they hit nitrogen and oxygen molecules in the atmosphere, spreading blue light across the sky.
When you cut an onion, it releases syn-propanethial-S-oxide, a volatile sulfur compound that irritates the nerve endings in your eyes. Your tear glands then produce tears to flush out the irritant.
Water is one of the few substances that expands when it freezes. Hydrogen bonds in ice form a crystalline lattice structure that spaces molecules farther apart than in liquid water, making ice less dense — so it floats.
Last updated: March 2026