Misc: The longest tunnel connects delaware and ______?

Questions

Which famous radio and television family appeared in the show 'Take It From Here'?

Who did the barons Fitzurse, De Tracy, De Morville and Le Breton conspire to murder?

What is the lowest level of the Earth's atmosphere called?

In India, and also the British forces, what job does a Dhobi Wallah do?

What is the correct chemical name for iron pyrites, sometimes known as 'Fool's gold'?