10 most difficult physics riddles A list of ten (out of 38) 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 crust26%Created by: life-o-holic. Statistics based on 10182 answers in 2 languages »elements riddles » What is the fifth state of matter?Bose-Einstien Condensate. In 1924, Two scientist Albert Einstien and Satyendranath Bose predicted the BEC ( Bose-Einstien Condensate) which is referred as the fifth state of matter. BEC is a state of matter of dilute gas of bosons cooled to temperatures very close to absolute zero.very hard 34% Bose-Einstien CondensateBose-Einstien Condensate34%PlasmaPlasma43%Fermion CondensateFermion Condensate15%GasGas5%Created by: Nabarup Ghosh. Statistics based on 495 answers in 2 languages » 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 35% Galileo GalileiGalileo Galilei20%Anders CelsiusAnders Celsius30%Gabriel Daniel FahrenheitGabriel Daniel Fahrenheit35%William KelvinWilliam Kelvin13%Created by: Paweł Kołodziejczyk. Statistics based on 3192 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 38% it would be uselessit would be useless27%explosiveexplosive5%armor-piercingarmor-piercing38%similar in its properties to a lead bulletsimilar in its properties to a lead bullet27%Created by: Cleo. Statistics based on 6771 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 41% 1Ω (ohm)1Ω (ohm)19%1S (siemens)1S (siemens)41%1H (henry)1H (henry)13%1T (tesla)1T (tesla)25%Created by: Paweł Kołodziejczyk. Statistics based on 3294 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 11010 answers in 2 languages »planets 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 Modulation4%Frequency ModulationFrequency Modulation47%Fast ModulationFast Modulation18%Microwaves Microwaves 29%Created by: Paweł Kołodziejczyk. Statistics based on 6448 answers in 2 languages »music 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 47% very lowvery low47%very highvery high14%in every temperaturein every temperature5%it depends on the material usedit depends on the material used32%Created by: Paweł Kołodziejczyk. Statistics based on 4234 answers in 2 languages »technology 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 47% 6613%7747%8819%121218%Created by: Kuba5371. Statistics based on 1914 answers in 2 languages »units riddles » Mars colonisation is a hype topic. What is the biggest threat for those wishing to take a part in a journey to Mars?Cosmic rays. The only efficient protection against high energetic cosmic radiation, one we are granted with, is Earth magnetic field. Both during a long flight to Mars and through the stay on the planet, that did not form electromagnetic field, astronauts would be exposed to ionization. hard 47% low temperatureslow temperatures11%lack of oxygenlack of oxygen31%poor gravitypoor gravity9%cosmic rayscosmic rays47%Created by: smyru. Statistics based on 10636 answers in 2 languages »astronautics riddles » Play physics quiz and see all the questions.