Misc: What holiday is the Indianapolis 500 traditionally run on?

Questions

What was the name of the submarine which sank the General Belgrano during the Falklands conflict?

After which creature is the Californian island of Alcatraz named?

Who was the losing Democratic candidate when Dwight D Eisenhower was re-elected as US President in 1956?

Which famous battle was fought this day In 490 BC?

Which composer was given the soubriquet' IL PRETE ROSSO I?