useless trivia: What Word Means: Group Nomenclature?

Questions

To make a daguerreotype, an early photograph, required a 15-minute average _______ time?

What cities expressways, built on a radial pattern dating from the eighteenth century, are so overloaded that traffic often grinds to a halt for 30 to 40 miles outside the city?

A device invented as a primitive steam engine by the Greek engineer Hero, about the time of the birth of Christ, is used today as a?

During the U.S. Civil War, telegraph wires were strung to follow and report on the action on the battlefield. But there was no telegraph office in the White House, so President Lincoln trekked across the street to the ___________ to get the news?

In ___, Namco released Pac-Man, the most popular arcade game of all time?