Problem: Transistor:

FETs are further divided into depletion-mode and enhancement-mode types, depending on whether the channel is turned on or off with zero gate-to-source voltage. For enhancement mode, the channel is off at zero bias, and a gate potential can "enhance" the conduction. For the depletion mode, the channel is on at zero bias, and a gate potential (of the opposite polarity) can "deplete" the channel, reducing conduction. For either mode, a more positive gate voltage corresponds to a higher current for n-channel devices and a lower current for p-channel devices. Nearly all JFETs are depletion-mode because the diode junctions would forward bias and conduct if they were enhancement-mode devices; most IGFETs are enhancement-mode types.

What type of FET is more common?
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A: unanswerable


Problem: The older 78 format continued to be mass-produced alongside the newer formats using new materials until about 1960 in the U.S., and in a few countries, such as India (where some Beatles recordings were issued on 78), into the 1960s. For example, Columbia Records' last reissue of Frank Sinatra songs on 78 rpm records was an album called Young at Heart, issued November 1, 1954. As late as the 1970s, some children's records were released at the 78 rpm speed. In the United Kingdom, the 78 rpm single lasted longer than in the United States and the 45 rpm took longer to become popular. The 78 rpm was overtaken in popularity by the 45 rpm in the late 1950s, as teenagers became increasingly affluent.
What was the last country to phase out the 78 rpm?
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Answer: United Kingdom


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
A kickback is an official's share of misappropriated funds allocated from his or her organization to an organization involved in corrupt bidding. For example, suppose that a politician is in charge of choosing how to spend some public funds. He can give a contract to a company that is not the best bidder, or allocate more than they deserve. In this case, the company benefits, and in exchange for betraying the public, the official receives a kickback payment, which is a portion of the sum the company received. This sum itself may be all or a portion of the difference between the actual (inflated) payment to the company and the (lower) market-based price that would have been paid had the bidding been competitive.
What is the public official's share called when involved in corrupt bidding?
A: kickback


Context and question: Meanwhile, Le Verrier by letter urged Berlin Observatory astronomer Johann Gottfried Galle to search with the observatory's refractor. Heinrich d'Arrest, a student at the observatory, suggested to Galle that they could compare a recently drawn chart of the sky in the region of Le Verrier's predicted location with the current sky to seek the displacement characteristic of a planet, as opposed to a fixed star. On the evening of 23 September 1846, the day Galle received the letter, he discovered Neptune within 1° of where Le Verrier had predicted it to be, about 12° from Adams' prediction. Challis later realised that he had observed the planet twice, on 4 and 12 August, but did not recognise it as a planet because he lacked an up-to-date star map and was distracted by his concurrent work on comet observations.
What did Henrich d'Arrest seek to find? 
Answer: the displacement characteristic of a planet


Question: Paper made from wood pulp is not necessarily less durable than a rag paper. The ageing behavior of a paper is determined by its manufacture, not the original source of the fibres. Furthermore, tests sponsored by the Library of Congress prove that all paper is at risk of acid decay, because cellulose itself produces formic, acetic, lactic and oxalic acids.
Is there an answer to this question: Besides formic, acetic, and lactic acid, what type of acid does cellulose produce?

Answer: oxalic


Problem: Comics:

Gag and editorial cartoons usually consist of a single panel, often incorporating a caption or speech balloon. Definitions of comics which emphasize sequence usually exclude gag, editorial, and other single-panel cartoons; they can be included in definitions that emphasize the combination of word and image. Gag cartoons first began to proliferate in broadsheets published in Europe in the 18th and 19th centuries, and the term "cartoon"[h] was first used to describe them in 1843 in the British humour magazine Punch.

When did gag single-panel illustrations become known as cartoons?
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A:
1843