QUES: Q: Who discovered Hydrogen gas?
A: In 1766, Henry Cavendish was the first to recognize hydrogen gas as a discrete substance, by naming the gas from a metal-acid reaction "flammable air".
Does the answer answer the question?

ANS: no

QUES: Q: When was the metric system officially introduced?
A: Napoleon ultimately took a retrograde step in 1812 when he passed legislation to introduce the mesures usuelles (traditional units of measurement) for retail tradea system of measure that resembled the pre-revolutionary units but were based on the kilogram and the metre; for example the livre metrique (metric pound) was 500 g instead of 489.5 gthe value of the livre du roi (the king's pound).
Does the answer answer the question?

ANS: no

QUES: Q: Who holds the record for the most goals in the Premier League?
A: Former Blackburn Rovers and Newcastle United striker Alan Shearer holds the record for most Premier League goals with 260.
Does the answer answer the question?

ANS: yes

QUES: Q: When will income tax be introduced on Norfolk Island?
A: The introduction of income taxation will now come into effect on July 1, 2016, with a variation of opinion on the island about these changes but with many understanding that for the island's governance to continue there is a need to pay into the commonwealth revenue pool so that the island can have assistance in supporting its delivery of State government responsibilities such as health, education, medicare, and infrastructure.
Does the answer answer the question?

ANS:
yes