useless trivia: What Word Means: An Indian Tree Whose Roots Are Nitrogen Fixers?

Questions

What do we call the first visitor after midnight on New Years Eve?

What in sound reproduction is the name of a slow fluctuation in pitch?

By what nickname was George Brummell usually known?

Which driver won the British Grand Prix four years running from 1962 to 1965?

What was Paul Scotts sequel to the Raj Quartet?