1) Parity operator:
What is the form of this operator and what are the intrinsic parities
of fundamental particles? Which interactions conserve parity.

2) The parity is violated in beta decay.
Explain how it was observed experimentally. 

2) Weak interactions:
Explain the V-A structure of this interaction.
What is the evidence for it. What is the strength of weak interactions.
Write down few master formulas and illustrate with Feynman diagrams.