useless trivia: What Word Means: Knocks Against?

Questions

What was the name of the scandal that resulted in the resignation of President Nixon?

What was the name of the secret empire?

What was the name of the space shuttle that exploded in mid air shortly after takeoff?

What was the name of the synagogue ruler whose daughter Jesus raised?

What was the name of the union jack that was used to capture Blackbeard off Ocracoke Island in 1718?