Can French Defence initial move defend against four move checkmate?
Rationale first then the answer.
The French Defence involves moving pawn in front of the queen forward two spaces. The four move checkmate involves moving the queen and bishop to crowd the king. The four move checkmate cannot be defended by pawn in front of queen.. The answer is: no.

Is Europa linked to Viennese waltzes?
Rationale first then the answer.
Europa is a moon of Jupiter. Europa played an important role in Stanley Kubrick's film 2001: A Space Odyssey. The soundtrack to 2001: A Space Odyssey prominently featured The Blue Danube. The Blue Danube is a famous Viennese waltz composed by Johan Strauss II.. The answer is: yes.

Is it okay to lie after taking an oath in a court of law?
Rationale first then the answer.
In a court of law, lying under oath is considered perjury. Perjury is considered a crime.. The answer is: no.