Problem: Political party:

In dominant-party systems, opposition parties are allowed, and there may be even a deeply established democratic tradition, but other parties are widely considered to have no real chance of gaining power. Sometimes, political, social and economic circumstances, and public opinion are the reason for others parties' failure. Sometimes, typically in countries with less of an established democratic tradition, it is possible the dominant party will remain in power by using patronage and sometimes by voting fraud. In the latter case, the definition between dominant and one-party system becomes rather blurred. Examples of dominant party systems include the People's Action Party in Singapore, the African National Congress in South Africa, the Cambodian People's Party in Cambodia, the Liberal Democratic Party in Japan, and the National Liberation Front in Algeria. One-party dominant system also existed in Mexico with the Institutional Revolutionary Party until the 1990s, in the southern United States with the Democratic Party from the late 19th century until the 1970s, in Indonesia with the Golkar from the early 1970s until 1998.

For how long did the dominant one-party system last in mexico?
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A: 1990s


Problem: Vacuum:

Hydrostatic gauges (such as the mercury column manometer) consist of a vertical column of liquid in a tube whose ends are exposed to different pressures. The column will rise or fall until its weight is in equilibrium with the pressure differential between the two ends of the tube. The simplest design is a closed-end U-shaped tube, one side of which is connected to the region of interest. Any fluid can be used, but mercury is preferred for its high density and low vapour pressure. Simple hydrostatic gauges can measure pressures ranging from 1 torr (100 Pa) to above atmospheric. An important variation is the McLeod gauge which isolates a known volume of vacuum and compresses it to multiply the height variation of the liquid column. The McLeod gauge can measure vacuums as high as 10−6 torr (0.1 mPa), which is the lowest direct measurement of pressure that is possible with current technology. Other vacuum gauges can measure lower pressures, but only indirectly by measurement of other pressure-controlled properties. These indirect measurements must be calibrated via a direct measurement, most commonly a McLeod gauge.

What is a vertical column of liquid in a tube which has different pressures at each end called?
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A: Hydrostatic gauges


Problem: American Idol:

For an unprecedented eight consecutive years, from the 2003–04 television season through the 2010–11 season, either its performance or result show had been ranked number one in U.S. television ratings. The popularity of American Idol however declined, and on May 11, 2015, Fox announced that the series would conclude its run in its fifteenth season.

For how many seasons did American Idol air? 
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A: 15


Problem: Southeast Asia:

Puppetry and shadow plays were also a favoured form of entertainment in past centuries, a famous one being Wayang from Indonesia. The arts and literature in some of Southeast Asia is quite influenced by Hinduism, which was brought to them centuries ago. Indonesia, despite conversion to Islam which opposes certain forms of art, has retained many forms of Hindu-influenced practices, culture, art and literature. An example is the Wayang Kulit (Shadow Puppet) and literature like the Ramayana. The wayang kulit show has been recognized by UNESCO on November 7, 2003, as a Masterpiece of Oral and Intangible Heritage of Humanity.

Which country despite converting to Islam has retained many forms of Hindu practices, culture, art & literature?
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A:
Indonesia