UnScramble this Word: o r s s e b u?

Questions

In Imperial measurement, how many square yards are in a square chain?

Which Czech village seas destroyed by the Germans in retaliation, following the assassination of Reinhard Heydrich in World War Two?

Who wrote the 1958 play Five Finger Exercise?

In which large bay would you find the Belcher Islands?

In 1877, Edison demonstrated his first gramophone with a recording of himself reciting which nursery rhyme?