QUES: Most elevators have a location in which the permit for the building owner to operate the elevator is displayed. While some jurisdictions require the permit to be displayed in the elevator cab, other jurisdictions allow for the operating permit to be kept on file elsewhere – such as the maintenance office – and to be made available for inspection on demand. In such cases instead of the permit being displayed in the elevator cab, often a notice is posted in its place informing riders of where the actual permits are kept.
Aside from the elevator, where else might a permit be displayed?

ANS: the maintenance office

QUES: Computers control functions at many utilities, including coordination of telecommunications, the power grid, nuclear power plants, and valve opening and closing in water and gas networks. The Internet is a potential attack vector for such machines if connected, but the Stuxnet worm demonstrated that even equipment controlled by computers not connected to the Internet can be vulnerable to physical damage caused by malicious commands sent to industrial equipment (in that case uranium enrichment centrifuges) which are infected via removable media. In 2014, the Computer Emergency Readiness Team, a division of the Department of Homeland Security, investigated 79 hacking incidents at energy companies.
What demonstrated equipment controlled by computers not connected to the internet can also be vulnerable?

ANS: the Stuxnet worm

QUES: The Valencia Metro derailment occurred on 3 July 2006 at 1 pm. CEST (1100 UTC) between Jesús and Plaça d'Espanya stations on Line 1 of the Metrovalencia mass transit system. 43 people were killed and more than ten were seriously injured. It was not immediately clear what caused the crash. Both the Valencian government spokesman Vicente Rambla and Mayor Rita Barberá called the accident a "fortuitous" event. However, the trade union CC.OO. accused the authorities of "rushing" to say anything but admit that Line 1 is in a state of "constant deterioration" with a "failure to carry out maintenance".
When did the Valencia metro derail?

ANS: 3 July 2006

QUES: By the end of the 12th century, samurai became almost entirely synonymous with bushi, and the word was closely associated with the middle and upper echelons of the warrior class. The samurai were usually associated with a clan and their lord, were trained as officers in military tactics and grand strategy, and they followed a set of rules that later came to be known as the bushidō. While the samurai numbered less than 10% of then Japan's population, their teachings can still be found today in both everyday life and in modern Japanese martial arts.
What class were samurais?

ANS:
middle and upper echelons of the warrior class