Flash questions
Short drills on core skills, drawn at random each time you open one. A wall of cards to project, print or run as a timed slideshow — answers stay hidden until you ask for them.
PhysicsHigh school
SI units
Matching each physical quantity to its SI unit and to the symbol that denotes it.
Open the wall
PhysicsHigh school
Physics and chemistry formulas
The formulas from the syllabus, to be recalled as they stand before knowing how to use them.
Open the wall
What are flash questions for?
A flash question is answered in seconds, in your head. Strung into a short series, they keep sharp the basics — times tables, fractions, conversions, formulas — that longer exercises already assume. Every wall is drawn afresh: the same series never comes back identical, unless you keep its address.