10 most difficult physics riddles A list of ten (out of 37) physics related questions that are the most often answered incorrectly Physics quiz This is an iron buoy. Where were its atoms formed?In a high-mass star preceding Sun. Radioactive nickel-56 (which decays to the most common isotope of iron) is the last element to be produced before the collapse of a supernova. That is why the iron was abundantly scattered into space after the supernova explosion.very hard 34% in a high-mass star preceding Sunin a high-mass star preceding Sun34%in the Sunin the Sun8%in the Earth's corein the Earth's core29%in the Earth's crustin the Earth's crust27%Created by: life-o-holic. Statistics based on 9487 answers in 2 languages »elements riddles » Who invented the mercury-in-glass thermometer?Gabriel Daniel Fahrenheit. Daniel Gabriel Fahrenheit was a German physicist, engineer, and glass blower who is best known for inventing the mercury-in-glass thermometer (1714), and for developing a temperature scale now named after him very hard 34% Galileo GalileiGalileo Galilei21%Anders CelsiusAnders Celsius30%Gabriel Daniel FahrenheitGabriel Daniel Fahrenheit34%William KelvinWilliam Kelvin13%Created by: Paweł Kołodziejczyk. Statistics based on 2602 answers in 4 languages »inventors riddles » If a gun bullet was made of gold, what properties would it have?Armor-piercing. The density of gold is 19,320 kg/m3, which is higher than of uranium (18,800) and much higher than of lead (11,340). The armor-piercing ammo is made of uranium for its high density - golden bullets would work for this purpose even better.very hard 37% it would be uselessit would be useless28%explosiveexplosive5%armor-piercingarmor-piercing37%similar in its properties to a lead bulletsimilar in its properties to a lead bullet27%Created by: Cleo. Statistics based on 5874 answers in 2 languages »guns riddles » What is the unit of the conductance?1S (siemens). Conductance (conductivity) is the reverse of the resistance. So it is a measure of the susceptibility of the element to the flow of the electric current. Siemens is the unit of electric conductance named after German inventor and industrialist Werner von Siemens, founder of the well known Siemens company.hard 40% 1Ω (ohm)1Ω (ohm)20%1S (siemens)1S (siemens)40%1H (henry)1H (henry)13%1T (tesla)1T (tesla)25%Created by: Paweł Kołodziejczyk. Statistics based on 2783 answers in 2 languages »electricity riddles » This is the aurora of Jupiter. What are the visible bright spots caused by?Jupiter moons. Jupiter's moons, especially Io (spot on the left), are powerful sources of auroras on Jupiter. These arise from electric currents along field lines, generated by a dynamo mechanism due to the relative motion between the rotating planet and the moving moon.hard 42% volcanic peaksvolcanic peaks4%atmospheric stormsatmospheric storms23%Jupiter moonsJupiter moons42%multiple magnetic poles of Jupitermultiple magnetic poles of Jupiter29%Created by: globalquiz.org. Statistics based on 10070 answers in 2 languages »planets riddles » How many basic units are in the SI system?7. The SI system have seven basic units, it's a meter, kilogram, second, amper, kelvin and molhard 44% 6614%7744%8820%121219%Created by: Kuba5371. Statistics based on 1333 answers in 2 languages »units riddles » In what temperatures is the superconductivity observed?Very low. Superconductivity is a phenomenon of exactly zero electrical resistance and expulsion of magnetic fields, which occur in certain materials when cooled below a characteristic critical temperature. This quantum phenomenon is impossible to be explained by the classical physics. hard 46% very lowvery low46%very highvery high14%in every temperaturein every temperature5%it depends on the material usedit depends on the material used33%Created by: Paweł Kołodziejczyk. Statistics based on 3669 answers in 2 languages »technology riddles » What does "FM" found on radio receivers stand for?Frequency Modulation. In telecommunications and signal processing, frequency modulation (FM) is the encoding of information in a carrier wave by varying the instantaneous frequency of the wave. hard 47% Amplitude ModulationAmplitude Modulation3%Frequency ModulationFrequency Modulation47%Fast ModulationFast Modulation18%Microwaves Microwaves 29%Created by: Paweł Kołodziejczyk. Statistics based on 5476 answers in 2 languages »music riddles » Which water phase is the most dense?Liquid water. Ice frozen at atmospheric pressure is approximately 8.3% less dense than liquid water. Thus, ice floats on liquid water.hard 48% liquid waterliquid water48%water icewater ice35%water vaporwater vapor5%all have the same densityall have the same density11%Created by: Kasia. Statistics based on 14468 answers in 2 languages »ice riddles » What is entropy?It is a measure of the disorder in a closed system. It is a measure of the disorder or randomness in a closed system. The second law of thermodynamics states that if isolated thermodynamic system spontaneously evolves into another state of equilibrium, its entropy will always increase. The term was invented by Rudolf Clausius.hard 48% It is a measure of the disorder in a closed system.It is a measure of the disorder in a closed system.48%It is a measure of system's sizeIt is a measure of system's size11%Both answers are correctBoth answers are correct20%None of above answersNone of above answers19%Created by: Władysław Pękala. Statistics based on 2149 answers in 2 languages »space riddles » Play physics quiz and see all the questions.