General Science practice test

General Science asks about the natural world: biology, chemistry, physics, earth and space science, and health. The questions are broad and factual — they test whether you know a basic fact or principle, not whether you can solve a long problem. A question might ask what a cell's nucleus does, which gas plants take in, or what causes a rainbow. The bank here covers the concepts most often tested, from the structure of matter and the basics of electricity to the human body and the water cycle. Because the range is wide, the best preparation is breadth: read across the topics rather than going deep on one. Each question here is original and written for this site, and each carries a one-line explanation of the correct answer.