Problem: Lighting:

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).

What is the amount of useful light emitted from a luminous flux measured in? 
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A: lumen (lm)


Problem: Middle Ages:

A three-year civil war followed his death. By the Treaty of Verdun (843), a kingdom between the Rhine and Rhone rivers was created for Lothair to go with his lands in Italy, and his imperial title was recognised. Louis the German was in control of Bavaria and the eastern lands in modern-day Germany. Charles the Bald received the western Frankish lands, comprising most of modern-day France. Charlemagne's grandsons and great-grandsons divided their kingdoms between their descendants, eventually causing all internal cohesion to be lost.[N] In 987 the Carolingian dynasty was replaced in the western lands, with the crowning of Hugh Capet (r. 987–996) as king.[O][P] In the eastern lands the dynasty had died out earlier, in 911, with the death of Louis the Child, and the selection of the unrelated Conrad I (r. 911–918) as king.

In what modern country were Louis the German's lands?
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A: Germany


Problem: Sony Music Entertainment:

In May 2012, Sony Music filed charges against the website IsoHunt. The plaintifs claims in the court document filed at the supreme court of British Columbia: "The IsoHunt Websites have been designed and are operated by the defendants with the sole purpose of profiting from rampant copyright infringement which defendants actively encourage, promote, authorize, induce, aid, abet, materially contribute to and commercially profit from."

The website IsoHunt filed charges against Sony Music in what year?
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A: unanswerable


Problem: Northwestern University:

Undergraduate tuition for the 2012/13 school year was $61,240; this includes the basic tuition of $43,380, fees (health $200, etc.), room and board of $13,329 (less if commuting), books and supplies $1,842, personal expenses $1,890, transportation cost of $400. Northwestern awards financial aid solely on the basis of need through loans, work-study, grants, and scholarships. The University processed in excess of $472 million in financial aid for the 2009–2010 academic year. This included $265 million in institutional funds, with the remainder coming from federal and state governments and private organizations and individuals. Northwestern scholarship programs for undergraduate students support needy students from a variety of income and backgrounds. Approximately 44 percent of the June 2010 graduates had received federal and/or private loans for their undergraduate education, graduating with an average debt of $17,200.

What was the total undergrad tuition for the 2012/2013 school year?
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A:
$61,240