Problem: Luminous efficacy of a light source may be defined in two ways. The radiant luminous efficacy (LER) is the ratio of the visible light flux emitted (the luminous flux) to the total power radiated over all wavelengths. The source luminous efficacy (LES) is the ratio of the visible light flux emitted (the luminous flux) to the total power input to the source, such as a lamp. Visible light is measured in lumens, a unit which is defined in part by the differing sensitivity of the human eye to different wavelengths of light. Not all wavelengths of visible electromagnetic energy are equally effective at stimulating the human eye; the luminous efficacy of radiant energy (LER) is a measure of how well the distribution of energy matches the perception of the eye. The units of luminous efficacy are "lumens per watt" (lpw). The maximum LER possible is 683 lm/W for monochromatic green light at 555 nanometers wavelength, the peak sensitivity of the human eye.
In how many ways can one define luminous efficacy of a light source?
The answer is the following: two ways

Problem: In the nineteenth and twentieth centuries the RIBA and its members had a leading part in the promotion of architectural education in the United Kingdom, including the establishment of the Architects' Registration Council of the United Kingdom (ARCUK) and the Board of Architectural Education under the Architects (Registration) Acts, 1931 to 1938. A member of the RIBA, Lionel Bailey Budden, then Associate Professor in the Liverpool University School of Architecture, had contributed the article on Architectural Education published in the fourteenth edition of the Encyclopdia Britannica (1929). His School, Liverpool, was one of the twenty schools named for the purpose of constituting the statutory Board of Architectural Education when the 1931 Act was passed.
What organization was the Royal Institute instrumental in establishing?
The answer is the following: the Architects' Registration Council of the United Kingdom

Problem: Schwarzenegger served in the Austrian Army in 1965 to fulfill the one year of service required at the time of all 18-year-old Austrian males. During his army service, he won the Junior Mr. Europe contest. He went AWOL during basic training so he could take part in the competition and spent a week in military prison: "Participating in the competition meant so much to me that I didn't carefully think through the consequences." He won another bodybuilding contest in Graz, at Steirer Hof Hotel (where he had placed second). He was voted best built man of Europe, which made him famous. "The Mr. Universe title was my ticket to America the land of opportunity, where I could become a star and get rich." Schwarzenegger made his first plane trip in 1966, attending the NABBA Mr. Universe competition in London. He would come in second in the Mr. Universe competition, not having the muscle definition of American winner Chester Yorton.
When did Schwarzenegger take an airplane for the first time ever?
The answer is the following: 1966

Problem: The year 1759 saw several Prussian defeats. At the Battle of Kay, or Paltzig, the Russian Count Saltykov with 47,000 Russians defeated 26,000 Prussians commanded by General Carl Heinrich von Wedel. Though the Hanoverians defeated an army of 60,000 French at Minden, Austrian general Daun forced the surrender of an entire Prussian corps of 13,000 in the Battle of Maxen. Frederick himself lost half his army in the Battle of Kunersdorf (now Kunowice Poland), the worst defeat in his military career and one that drove him to the brink of abdication and thoughts of suicide. The disaster resulted partly from his misjudgment of the Russians, who had already demonstrated their strength at Zorndorf and at Gross-Jagersdorf (now Motornoye, Russia), and partly from good cooperation between the Russian and Austrian forces.
What happened to Frederick's army at the Battle at Kunersdorf?
The answer is the following:
Frederick himself lost half his army