input question: I want to test the ability of students to read a passage and answer questions about it. Could you please come up with a good question for the passage "In recent years light emitting diodes (LEDs) are becoming increasingly efficient leading to an extraordinary increase in the use of solid state lighting. In many situations, controlling the light emission of LEDs may be done most effectively by using the principles of nonimaging optics."????
output answer: Two terminals components that produces a current in one direction are called?

input question: I want to test the ability of students to read a passage and answer questions about it. Could you please come up with a good question for the passage "In 1185 John made his first visit to Ireland, accompanied by 300 knights and a team of administrators. Henry had tried to have John officially proclaimed King of Ireland, but Pope Lucius III would not agree. John's first period of rule in Ireland was not a success. Ireland had only recently been conquered by Anglo-Norman forces, and tensions were still rife between Henry II, the new settlers and the existing inhabitants. John infamously offended the local Irish rulers by making fun of their unfashionable long beards, failed to make allies amongst the Anglo-Norman settlers, began to lose ground militarily against the Irish and finally returned to England later in the year, blaming the viceroy, Hugh de Lacy, for the fiasco."????
output answer: When did John do badly during his reign in Ireland?

input question: I want to test the ability of students to read a passage and answer questions about it. Could you please come up with a good question for the passage "Mikhail Gorbachev was elected General Secretary by the Politburo on March 11, 1985, three hours after predecessor Konstantin Chernenko's death at age 73. Gorbachev, aged 54, was the youngest member of the Politburo. His initial goal as general secretary was to revive the Soviet economy, and he realized that doing so would require reforming underlying political and social structures. The reforms began with personnel changes of senior Brezhnev-era officials who would impede political and economic change. On April 23, 1985, Gorbachev brought two proteges, Yegor Ligachev and Nikolai Ryzhkov, into the Politburo as full members. He kept the "power" ministries happy by promoting KGB Head Viktor Chebrikov from candidate to full member and appointing Minister of Defence Marshal Sergei Sokolov as a Politburo candidate."????
output answer: How many 365 day periods did Chernenko reach?

input question: I want to test the ability of students to read a passage and answer questions about it. Could you please come up with a good question for the passage "Many minerals provide pigments which have been used in green paints and dyes over the centuries. Pigments, in this case, are minerals which reflect the color green, rather that emitting it through luminescent or phosphorescent qualities. The large number of green pigments makes it impossible to mention them all. Among the more notable green minerals, however is the emerald, which is colored green by trace amounts of chromium and sometimes vanadium. Chromium(III) oxide (Cr2O3), is called chrome green, also called viridian or institutional green when used as a pigment. For many years, the source of amazonite's color was a mystery. Widely thought to have been due to copper because copper compounds often have blue and green colors, the blue-green color is likely to be derived from small quantities of lead and water in the feldspar. Copper is the source of the green color in malachite pigments, chemically known as basic copper(II) carbonate."????
output answer:
What mineral involves cooper having though to be the cause of its color?