Postage stamp separation: Quiz

Question 1: The finest gauge ever used is 18 on stamps of the Malay States in the early 1950s, and the coarsest is 2, seen on the 1891 stamps of ________.
MumbaiBhopalDelhiLucknow

Question 2: In the 1990s, ________ began adding large elliptical holes to the perforations on each side, as an anti-counterfeiting measure.
United KingdomGreat BritainScotlandEngland

Question 3: For ________, separation is the means by which individual stamps are made easily detachable from each other.
Stamp collectingAirmail stampMailPostage stamp

Question 4: A few types of stamps have combined rouletting and perforation, for instance ________ in 1942.
South AfricaMauritiusCanadaSierra Leone

Source: The Full Wiki (http://quiz.thefullwiki.org/Postage_stamp_separation)