GeorgEGNT,
I received the link for the questions in the same email as the acknowledgement.
"Dear Applicant
We are pleased to confirm that your application has progressed to the next phase of the 2016 Aer Lingus Cadet Pilot Training Programme.
Please, click on the link below to answer the questions and return them to us within the next three days.
Your username and password to access the questions are the following:"