QUES: When the board has no embedded components it is more correctly called a printed wiring board (PWB) or etched wiring board. However, the term printed wiring board has fallen into disuse. A PCB populated with electronic components is called a printed circuit assembly (PCA), printed circuit board assembly or PCB assembly (PCBA). The IPC preferred term for assembled boards is circuit card assembly (CCA), and for assembled backplanes it is backplane assemblies. The term PCB is used informally both for bare and assembled boards.
A painted wiring board can also be called what?

ANS: unanswerable

QUES: Some contemporaries alleged that Bonaparte was put under house arrest at Nice for his association with the Robespierres following their fall in the Thermidorian Reaction in July 1794, but Napoleon's secretary Bourrienne disputed the allegation in his memoirs. According to Bourrienne, jealousy was responsible, between the Army of the Alps and the Army of Italy (with whom Napoleon was seconded at the time). Bonaparte dispatched an impassioned defense in a letter to the commissar Salicetti, and he was subsequently acquitted of any wrongdoing.
What historical event brought about the fall of the Robespierres?

ANS: the Thermidorian Reaction

QUES: The alkali metal ions are small and mobile; their presence in glass allows a degree of electrical conductivity, especially in molten state or at high temperature. Their mobility decreases the chemical resistance of the glass, allowing leaching by water and facilitating corrosion. Alkaline earth ions, with their two positive charges and requirement for two non-bridging oxygen ions to compensate for their charge, are much less mobile themselves and also hinder diffusion of other ions, especially the alkalis. The most common commercial glasses contain both alkali and alkaline earth ions (usually sodium and calcium), for easier processing and satisfying corrosion resistance. Corrosion resistance of glass can be achieved by dealkalization, removal of the alkali ions from the glass surface by reaction with e.g. sulfur or fluorine compounds. Presence of alkaline metal ions has also detrimental effect to the loss tangent of the glass, and to its electrical resistance; glasses for electronics (sealing, vacuum tubes, lamps...) have to take this in account.
What can alkaline ions in oxygen harm?

ANS: unanswerable

QUES: Mobbing can be an interspecies activity: it is common for birds to respond to mobbing calls of a different species. Many birds will show up at the sight of mobbing and watch and call, but not participate. It should also be noted that some species can be on both ends of a mobbing attack. Crows are frequently mobbed by smaller songbirds as they prey on eggs and young from these birds' nests, but these same crows will cooperate with smaller birds to drive away hawks or larger mammalian predators. On occasion, birds will mob animals that pose no threat.
Will birds often mob animals that do not pose a threat?

ANS:
On occasion