1. It all depends on their requirements.

2. Don't think you will be joining your expected position/role.

The interview will be quite good.

1. Just be confident; you will get the offer.

2. If they want to take you for their requirement, a domain person will come and take your interview. They will ask questions that you might not be able to answer. Then, they will tell you that you may not fit for this position but that you might be a fit for a similar other position. Likewise, they will convince you. I would recommend going for an interview on a working day if you want the position you like. If you just want any position, go for an interview on the weekend.

It's all related to the project domain.

One round will be programming language.