119 tests · 11 categories
Science tests
Every test starts with a short course and ends with a quiz. Missed questions come back with the right answer and why it is right. No account and no timer.
18 tests
- Easy
The human body
Organs, systems and what each part is actually doing.
8 questions6 min - Medium
Space and astronomy
The solar system, the scale of it, and the forces holding it together.
8 questions7 min - Medium
Physics basics
Motion, forces, energy and waves, and the units that hold them together.
8 questions7 min - Medium
Engineering basics
Loads, materials, mechanisms and circuits, and the habit of designing for failure.
8 questions7 min - Medium
Scientific reasoning
How claims are tested, why controls exist, and what a result actually shows.
8 questions7 min - Medium
Chemistry basics
Atoms, bonds and reactions, and why the periodic table is arranged that way.
8 questions7 min - Medium
Biology and genetics
Cells, DNA and inheritance, from the molecule to the family tree.
8 questions7 min - Medium
Evolution
How populations change, and the misunderstandings that make it seem stranger than it is.
8 questions7 min - Medium
Electricity and circuits
Voltage, current and resistance, and reading a circuit that actually works.
8 questions7 min - Hard
Mechanics
Forces, motion and equilibrium, worked the way engineers and physicists actually use them.
8 questions7 min - Hard
Thermodynamics
Heat, work and the two laws that decide what is possible.
8 questions7 min - Easy
Earth science
Rocks, plates and the slow processes that shaped everything you can see.
8 questions7 min - Medium
Climate and weather
What makes weather happen, and how climate differs from it.
8 questions7 min - Medium
Materials science
Why steel bends, glass shatters and plastic creeps, and how to choose between them.
8 questions7 min - Medium
Robotics basics
Sensing, deciding and moving, and why the last one is the hard part.
8 questions7 min - Easy
How machines work
Levers, gears, engines and the everyday devices built from them.
8 questions7 min - Medium
Inventions and discoveries
What changed the world, and why credit is rarely simple.
8 questions8 min - Medium
Famous scientists
Who worked out what, and what they actually got wrong.
8 questions7 min