Problem: Light-emitting diode:

High-power LEDs (HP-LEDs) or high-output LEDs (HO-LEDs) can be driven at currents from hundreds of mA to more than an ampere, compared with the tens of mA for other LEDs. Some can emit over a thousand lumens. LED power densities up to 300 W/cm2 have been achieved. Since overheating is destructive, the HP-LEDs must be mounted on a heat sink to allow for heat dissipation. If the heat from a HP-LED is not removed, the device will fail in seconds. One HP-LED can often replace an incandescent bulb in a flashlight, or be set in an array to form a powerful LED lamp.

Why must High-power LEDs be mounted on a heat sink?
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A: to allow for heat dissipation


Problem: Egypt:

Miṣr (IPA: [mi̠sˤr] or Egyptian Arabic pronunciation: [mesˤɾ]; Arabic: مِصر‎) is the Classical Quranic Arabic and modern official name of Egypt, while Maṣr (IPA: [mɑsˤɾ]; Egyptian Arabic: مَصر) is the local pronunciation in Egyptian Arabic. The name is of Semitic origin, directly cognate with other Semitic words for Egypt such as the Hebrew מִצְרַיִם (Mitzráyim). The oldest attestation of this name for Egypt is the Akkadian 𒆳 𒈪 𒄑 𒊒 KURmi-iṣ-ru miṣru, related to miṣru/miṣirru/miṣaru, meaning "border" or "frontier".

What is the Egyptian Arabic name for Egypt?
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A: Miṣr


Problem: Sanskrit:

Since the late 18th century, Sanskrit has been transliterated using the Latin alphabet. The system most commonly used today is the IAST (International Alphabet of Sanskrit Transliteration), which has been the academic standard since 1888. ASCII-based transliteration schemes have also evolved because of difficulties representing Sanskrit characters in computer systems. These include Harvard-Kyoto and ITRANS, a transliteration scheme that is used widely on the Internet, especially in Usenet and in email, for considerations of speed of entry as well as rendering issues. With the wide availability of Unicode-aware web browsers, IAST has become common online. It is also possible to type using an alphanumeric keyboard and transliterate to Devanagari using software like Mac OS X's international support.

What Greek alphabet has been transliterated since the 18th century?
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A: unanswerable


Problem: Adolescence:

There are at least two major approaches to understanding cognitive change during adolescence. One is the constructivist view of cognitive development. Based on the work of Piaget, it takes a quantitative, state-theory approach, hypothesizing that adolescents' cognitive improvement is relatively sudden and drastic. The second is the information-processing perspective, which derives from the study of artificial intelligence and attempts to explain cognitive development in terms of the growth of specific components of the thinking process.

What view towards cognitive development during adolescence did Piaget take?
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A:
constructivist