QUES: Q: What kind of lasers are crystals of zinc suflde used in?
A: Crystals of ZnS are used in lasers that operate in the mid-infrared part of the spectrum.
Does the answer answer the question?

ANS: yes

QUES: Q: In what year did the city vote to change to a strong mayor government?
A: The change was brought about by a citywide vote in 2004.
Does the answer answer the question?

ANS: yes

QUES: Q: Why did Teletype have the code for "rubout"?
A: Code 127 is officially named "delete" but the Teletype label was "rubout".
Does the answer answer the question?

ANS: no

QUES: Q: Who would engrave the master disc of a vinyl record?
A: A record cutter would engrave the grooves into the master disc.
Does the answer answer the question?

ANS:
yes