1011 past contests
Topic 4 · Riddle: newton's first law of motion (law of inertia)
Topic 41 · Electromagnetic force: long-range, and depends on charge not mass (true/false)
Topic 5 · Electrostatic force between two protons vastly exceeds their gravitational attraction (true/false)
Topic 2 · Gravity as a long-range force, and gravitational force proportional to mass (true/false)
Topic 28 · Incandescence colour progression with rising temperature (red, yellow, blue)
Topic 26 · Photon frequency from a laser's power and photon emission rate
Topic 26 · Laser power from photon frequency and photon emission rate
Topic 6 · Light-coloured clothing reflects more heat, keeping the wearer cooler
Topic 26 · Number of photons per second from a laser's power and photon frequency
Topic 10 · Pressure cooker raising boiling point at high altitude
Topic 12 · Relative error from a miscalibrated metre rule
Topic 64 · Riddle: interference of waves (constructive/destructive)
Topic 12 · Type of error from an incorrectly calibrated instrument
Topic 12 · Actual distance from a miscalibrated metre rule (0.99 cm graduations)
Topic 41 · Charged particle speed, cyclotron radius and cyclotron frequency in a magnetic field (true/false)
Topic 5 · Electrostatic potential is uniform over a charged conductor's surface (true/false)
Topic 5 · Potential inside a conductor equals its surface potential, not lower (true/false)
Topic 5 · Potential inside a hollow conductor equals the surface potential, not necessarily zero (true/false)
Topic 29 · Kinetic theory: gas volume is mostly empty space between molecules (true/false)
Topic 5 · Problem of the day: null point between two equal point charges