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 47% low temperatureslow temperatures1206lack of oxygenlack of oxygen3378poor gravitypoor gravity974cosmic rayscosmic rays5031planets 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 47% 6625577903883771212357units 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 50% It is a measure of the disorder in a closed system.It is a measure of the disorder in a closed system.1542It is a measure of system's sizeIt is a measure of system's size342Both answers are correctBoth answers are correct585None of above answersNone of above answers560space 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 35% Bose-Einstien CondensateBose-Einstien Condensate170PlasmaPlasma211Fermion CondensateFermion Condensate76GasGas28 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% glacierglacier366solidified CO2solidified CO29949legendary alchemical substancelegendary alchemical substance249meringue dessertmeringue dessert169ice 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% skyscrapersskyscrapers256the future the future 832dinosaursdinosaurs3719early Earth with no life yetearly Earth with no life yet1925astronomy 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 59% oneone1003twotwo1566threethree4494fourfour509elements 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 41% 1Ω (ohm)1Ω (ohm)6461S (siemens)1S (siemens)13581H (henry)1H (henry)4391T (tesla)1T (tesla)832electricity 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 35% Galileo GalileiGalileo Galilei666Anders CelsiusAnders Celsius954Gabriel Daniel FahrenheitGabriel Daniel Fahrenheit1125William KelvinWilliam Kelvin436inventors 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 low2001very highvery high599in every temperaturein every temperature229it depends on the material usedit depends on the material used1393technology riddles » Play physics quiz and see all the questions.