QUES: Vacuum is useful in a variety of processes and devices. Its first widespread use was in the incandescent light bulb to protect the filament from chemical degradation. The chemical inertness produced by a vacuum is also useful for electron beam welding, cold welding, vacuum packing and vacuum frying. Ultra-high vacuum is used in the study of atomically clean substrates, as only a very good vacuum preserves atomic-scale clean surfaces for a reasonably long time (on the order of minutes to days). High to ultra-high vacuum removes the obstruction of air, allowing particle beams to deposit or remove materials without contamination. This is the principle behind chemical vapor deposition, physical vapor deposition, and dry etching which are essential to the fabrication of semiconductors and optical coatings, and to surface science. The reduction of convection provides the thermal insulation of thermos bottles. Deep vacuum lowers the boiling point of liquids and promotes low temperature outgassing which is used in freeze drying, adhesive preparation, distillation, metallurgy, and process purging. The electrical properties of vacuum make electron microscopes and vacuum tubes possible, including cathode ray tubes. The elimination of air friction is useful for flywheel energy storage and ultracentrifuges.

What do lightbulbs allow particle beams to do without contamination?
What is the answer?
ANS: unanswerable
QUES: Calvary as an English name for the place is derived from the Latin word for skull (calvaria), which is used in the Vulgate translation of "place of a skull", the explanation given in all four Gospels of the Aramaic word Gulgalta which was the name of the place where Jesus was crucified. The text does not indicate why it was so designated, but several theories have been put forward. One is that as a place of public execution, Calvary may have been strewn with the skulls of abandoned victims (which would be contrary to Jewish burial traditions, but not Roman). Another is that Calvary is named after a nearby cemetery (which is consistent with both of the proposed modern sites). A third is that the name was derived from the physical contour, which would be more consistent with the singular use of the word, i.e., the place of "a skull". While often referred to as "Mount Calvary", it was more likely a small hill or rocky knoll.

Where was the location of the Crucifixion detailed?
What is the answer?
ANS: all four Gospels
QUES: There is a tendency to abandon traditionally gender-invariable adjectives in favour of marked ones, something prevalent in Occitan and French. Thus, one can find bullent/bullenta ("boiling") in contrast with traditional bullent/bullent.

What is ab example of a gender marked adjective?
What is the answer?
ANS:
bullent/bullenta