In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.
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Question: In solid-state physics, a dimensionally-equivalent "sheet" version of this quantity is often reported as its value "per square". Its quantum is equal to h over e squared, and the Drude model gives this extensive quantity as inversely proportional to the product of carrier number density and mobility. A complex version of this quantity includes a term equal to frequency times inductance. The power dissipated in a circuit equals (*) current squared times this value. Voltmeters work by applying a very large value for this quantity in parallel. Devices that provide this quantity are marked with a series of colored bands and symbolized with a zig-zag line. For 10 points, name this quantity set equal to voltage over current in a law named for Ohm, who also names its SI unit.

Answer: Science


Question: During this dynasty, the minister Qin Gui committed an infamous act of treachery against the general Yue Fei, and the author of the Comprehensive Mirror for Aid in Government, Sima Guang, opposed the New Laws of Wang Anshi. Zhao Kuangyin formed it, and gunpowder, the magnetic compass, and moveable type were invented during this era, before the death of emperor Qinzong led to the decline of its Northern period, but its southern incarnation survived until the Mongol conquest. For 10 points, name this dynasty is credited with unifying China after the Ten Kingdoms and Five Dynasties periods.

Answer: History


Question: He ascended to the throne by defeating a usurper who pretended to be this man's murdered uncle. In one of his notable administrative acts, he reorganized his empire into 20 sections. Near the end of his life, he ordered a large limestone rock to be inscribed with his genealogy in three languages; that inscription was translated into English in 1849. He also led an expedition against the tribes of the Danube River in 516 BC, put down a rebellion of Ionians in 499 BC, and attempted to subjugate Greece with his son-in-law Mardonius, but his forces were defeated at Mt. Athos and Marathon. FTP, name this Persian emperor who was succeeded by his son Xerxes I.

Answer:
History