Misc: 25th anniversary is silver, what's the 6th?

Questions

Frederick Gowland Hopkins won a Nobel prize in 1929 for which medical discovery?

In which Charles Dickens' novel do the characters, Mrs Pardiggle and the Jarndyce family appear?

Karl Landsteiner won a Nobel prize in 1930 for which medical discovery?

In which modern country is the region known as Cappadocia?

What is the unit of Imperial measure equal to 1/10 of a nautical mile?