Article: Measurement of light or photometry is generally concerned with the amount of useful light falling on a surface and the amount of light emerging from a lamp or other source, along with the colors that can be rendered by this light. The human eye responds differently to light from different parts of the visible spectrum, therefore photometric measurements must take the luminosity function into account when measuring the amount of useful light. The basic SI unit of measurement is the candela (cd), which describes the luminous intensity, all other photometric units are derived from the candela. Luminance for instance is a measure of the density of luminous intensity in a given direction. It describes the amount of light that passes through or is emitted from a particular area, and falls within a given solid angle. The SI unit for luminance is candela per square metre (cd/m2). The CGS unit of luminance is the stilb, which is equal to one candela per square centimetre or 10 kcd/m2. The amount of useful light emitted from a source or the luminous flux is measured in lumen (lm).

Question: What is the CGS unit of lumiance?
Ans: stilb


Article: The major opponent of Freemasonry was the Roman Catholic Church, so that in countries with a large Catholic element, such as France, Italy, Spain, and Mexico, much of the ferocity of the political battles involve the confrontation between what Davies calls the reactionary Church and enlightened Freemasonry. Even in France, Masons did not act as a group. American historians, while noting that Benjamin Franklin and George Washington were indeed active Masons, have downplayed the importance of Freemasonry in causing the American Revolution because the Masonic order was non-political and included both Patriots and their enemy the Loyalists.

Question: Which countries had a large Catholic element and therefore had confrontation with Freemasons?
Ans: France, Italy, Spain, and Mexico


Article: During the 1950s the rivalry was exacerbated further when there was a controversy surrounding the transfer of Alfredo di Stéfano, who finally played for Real Madrid and was key to their subsequent success. The 1960s saw the rivalry reach the European stage when they met twice in a controversial knock-out round of the European Cup, with Madrid receiving unfavourable treatment from the referee. In 2002, the European encounter between the clubs was dubbed the "Match of The Century" by Spanish media, and Madrid's win was watched by more than 500 million people.

Question: What was a match between Real Madrid and Barcelona called in 2002?
Ans: Match of The Century


Article: Her fourth studio album 4 was released on June 28, 2011 in the US. 4 sold 310,000 copies in its first week and debuted atop the Billboard 200 chart, giving Beyoncé her fourth consecutive number-one album in the US. The album was preceded by two of its singles "Run the World (Girls)" and "Best Thing I Never Had", which both attained moderate success. The fourth single "Love on Top" was a commercial success in the US. 4 also produced four other singles; "Party", "Countdown", "I Care" and "End of Time". "Eat, Play, Love", a cover story written by Beyoncé for Essence that detailed her 2010 career break, won her a writing award from the New York Association of Black Journalists. In late 2011, she took the stage at New York's Roseland Ballroom for four nights of special performances: the 4 Intimate Nights with Beyoncé concerts saw the performance of her 4 album to a standing room only.

Question: When did she perform at the Roseland ballroom?
Ans:
2011