1011 past contests
Topic 34 · Conserved quantity in a perfectly inelastic collision
Topic 20 · Conserved quantity in a nuclear reaction
Topic 34 · Conserved quantities in an elastic collision
Topic 17 · Riddle: the moon reflects rather than produces light
Topic 20 · Atomic number is unchanged by neutron absorption (true/false)
Topic 28 · Problem of the day: black-body radiation rate from the stefan-boltzmann law
Topic 20 · Mass number increases by one on neutron absorption (true/false)
Topic 20 · Atomic number is unchanged by gamma decay (true/false)
Topic 48 · Total internal reflection: medium direction, and light behaviour below/above the critical angle (true/false)
Topic 26 · Ranking electromagnetic spectrum regions by increasing wavelength
Topic 26 · Ranking electromagnetic spectrum regions by increasing energy
Topic 6 · Ranking visible-light colours by increasing frequency
Topic 8 · Ionization as one way radiation affects matter
Topic 60 · The brighter lamp in series has the higher resistance
Topic 60 · Current is equal at every point in a series circuit regardless of brightness
Topic 23 · How a scintillation counter detects radiation via light flashes
Topic 23 · How an ionization counter detects radioactive particles
Topic 60 · The brighter lamp in series has the greater potential difference across it
Topic 16 · Surface tension enabling small insects to float on water
Topic 35 · Friction supplying centripetal force for a vehicle rounding a flat curve