CB4 Software Engineer, Backend interview questions

Referred by agency. First interview is a phone session with a Senior Engineer involving some Java questions. Then a technical onsite interview, wasn't given the option to ask questions at all, they put me in a room straight away with PC and a code challenge. After solving the challenge, the interviewer has present a paper with some questions he asked me answer using java or pseudo code to solve. questions aren't too tough nor was the coding task. Interviewer hasn't given me the opportunity to ask questions n express my interest in CB4 in any matter. Also not sure what they seek for as I successfully solved the task and the questions presented to me on the paper but rejected.