Physics questions This is a list of recently added questions about physics. Play physics quiz and see all the questions. 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. Created by: smyruhard 46% low temperatureslow temperatures1171lack of oxygenlack of oxygen3280poor gravitypoor gravity922cosmic rayscosmic rays4754planets 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 molCreated by: Kuba5371hard 46% 6623377779883351212318units 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.Created by: Władysław Pękalahard 49% It is a measure of the disorder in a closed system.It is a measure of the disorder in a closed system.1332It is a measure of system's sizeIt is a measure of system's size306Both answers are correctBoth answers are correct528None of above answersNone of above answers508space 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.Created by: Nabarup Ghoshvery hard 30% Bose-Einstien CondensateBose-Einstien Condensate79PlasmaPlasma120Fermion CondensateFermion Condensate45GasGas12 What is dry ice?Solidified CO2. Dry ice is used in refrigeration. It has an interesting property: it maintains a constant temperature of -78.5C in a warmer environment. This is because dry ice does not melt and sublimes directly into the gaseous form.Created by: Niezgodnavery easy 92% glacierglacier353solidified CO2solidified CO29531legendary alchemical substancelegendary alchemical substance235meringue dessertmeringue dessert164ice riddles » Imagine that a distant civilization watches the Earth from 100 million light years away. What can they see right now?Dinosaurs. If a distant civilization watches the Earth right now, it sees its image from the past.Created by: Krzysztof Moskalhard 55% skyscrapersskyscrapers240the future the future 788dinosaursdinosaurs3507early Earth with no life yetearly Earth with no life yet1839astronomy riddles » How many hydrogen isotopes occur naturally on the Earth?Three isotopes of hydrogen occur naturally on the Earth: the most frequent protium (1H), deuterium (2H) and tritium (3H). Other isotopes of hydrogen (4H-7H) were created in laboratories and are highly unstable.Created by: Paweł Kołodziejczykhard 58% oneone942twotwo1477threethree4139fourfour478elements 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.Created by: Paweł Kołodziejczykhard 40% 1Ω (ohm)1Ω (ohm)6061S (siemens)1S (siemens)12451H (henry)1H (henry)4101T (tesla)1T (tesla)781electricity 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 Created by: Paweł Kołodziejczykvery hard 34% Galileo GalileiGalileo Galilei626Anders CelsiusAnders Celsius890Gabriel Daniel FahrenheitGabriel Daniel Fahrenheit1019William KelvinWilliam Kelvin394inventors 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. Created by: Paweł Kołodziejczykhard 47% very lowvery low1882very highvery high563in every temperaturein every temperature215it depends on the material usedit depends on the material used1324technology riddles » Play physics quiz and see all the questions.