TASK DEFINITION: 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.
PROBLEM: An anharmonic oscillator exploiting this effect as a microelectromechanical system component was proposed by Serry, Walliser, and Maclay. Julian Schwinger has postulated that sonoluminescence arises due to this effect, and this effect requires that bag radius and mass are independent under a combination of the Skyrmion and MIT models, the chiral bag model of the nucleon. One setup for measuring it attached a polystyrene sphere to an atomic force microscope, and Lamoreaux used a torsional pendulum to achieve the first precise measurements of this effect. This force may produce pressures as large as an atmosphere at a separation of ten nanometers. For 10 points, name this effect arising from zero-point energy, described by the attraction or repulsion due to virtual photons between two close uncharged metallic sheets in a vacuum.

SOLUTION: Science

PROBLEM: Wolfgang Kapp's coup was stopped in this city after a general strike. A meeting at this location gave Cyprus to the British, while another meeting here concluded with a General Act that established the Congo as private property. The Glienicke Bridge just outside this city was used to conduct several spy exchanges. Three corridors were used to access this city during one event here, where Operation Little Vittles was conducted. Checkpoint Charlie in this city was a famous part of a structure built here under orders from Walter Ulbricht. For 10 points, identify this capital of the Hohenzollern family of Prussia, split into 4 occupation zones following World War II.

SOLUTION: History

PROBLEM: This region of the atmosphere contains nacreous [NAY-kree-us] clouds, which are typically near the poles during cold seasons. Some scientists believe they can control climate change by injecting sulfate aerosols into this layer. Convection does not occur because of temperature inversion in this layer, whose coldest part is at its bottom, near the tropopause. The upper part of this region, which absorbs most of the ultraviolet light from the sun, is the ozone layer. Name this region between the troposphere and the mesosphere where most airplane flight takes place.

SOLUTION:
Social Science