Physics questions This is a list of recently added questions about physics. Play physics quiz and see all the questions. 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: Kuba5371units riddles »hard 44% 6619977601882811212262 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 Pękalaspace riddles »hard 48% It is a measure of the disorder in a closed system.It is a measure of the disorder in a closed system.1060It is a measure of system's sizeIt is a measure of system's size245Both answers are correctBoth answers are correct452None of above answersNone of above answers414 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 Ghosh<10 answersBose-Einstien CondensateBose-Einstien Condensate1PlasmaPlasma2Fermion CondensateFermion Condensate0GasGas0 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: Niezgodnaice riddles »very easy 92% glacierglacier329solidified CO2solidified CO29051legendary alchemical substancelegendary alchemical substance232meringue dessertmeringue dessert156 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 Moskalastronomy riddles »hard 54% skyscrapersskyscrapers228the future the future 735dinosaursdinosaurs3176early Earth with no life yetearly Earth with no life yet1704 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 Kołodziejczykelements riddles »hard 58% oneone874twotwo1360threethree3773fourfour439 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 Kołodziejczykelectricity riddles »hard 40% 1Ω (ohm)1Ω (ohm)5631S (siemens)1S (siemens)11321H (henry)1H (henry)3761T (tesla)1T (tesla)714 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 Kołodziejczykinventors riddles »very hard 34% Galileo GalileiGalileo Galilei574Anders CelsiusAnders Celsius791Gabriel Daniel FahrenheitGabriel Daniel Fahrenheit900William KelvinWilliam Kelvin341 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 Kołodziejczyktechnology riddles »hard 46% very lowvery low1710very highvery high531in every temperaturein every temperature202it depends on the material usedit depends on the material used1237 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. Created by: Paweł Kołodziejczykmusic riddles »hard 47% Amplitude ModulationAmplitude Modulation216Frequency ModulationFrequency Modulation2598Fast ModulationFast Modulation1037Microwaves Microwaves 1638 Play physics quiz and see all the questions.