QUES: Mechanical pulping yields almost a tonne of pulp per tonne of dry wood used, which is why mechanical pulps are sometimes referred to as "high yield" pulps. With almost twice the yield as chemical pulping, mechanical pulps is often cheaper. Mass-market paperback books and newspapers tend to use mechanical papers. Book publishers tend to use acid-free paper, made from fully bleached chemical pulps for hardback and trade paperback books.

What level of acid is usually found in the paper used by book publishers?
What is the answer?
ANS: acid-free
QUES: Research focusing on sexual orientation uses scales of assessment to identify who belongs in which sexual population group. It is assumed that these scales will be able to reliably identify and categorize people by their sexual orientation. However, it is difficult to determine an individual's sexual orientation through scales of assessment, due to ambiguity regarding the definition of sexual orientation. Generally, there are three components of sexual orientation used in assessment. Their definitions and examples of how they may be assessed are as follows:

How does research identify sexual population groups?
What is the answer?
ANS: scales of assessment
QUES: German beacons operated on the medium-frequency band and the signals involved a two-letter Morse identifier followed by a lengthy time-lapse which enabled the Luftwaffe crews to determine the signal's bearing. The Meacon system involved separate locations for a receiver with a directional aerial and a transmitter. The receipt of the German signal by the receiver was duly passed to the transmitter, the signal to be repeated. The action did not guarantee automatic success. If the German bomber flew closer to its own beam than the Meacon then the former signal would come through the stronger on the direction finder. The reverse would apply only if the meacon were closer.

The German beacons used what frequency band?
What is the answer?
ANS:
medium