Pergunta de entrevista da empresa ApniBus

Gave me assignment before interview.it was a weather application i need to make using an API. in android kotlin . in interview they asked me question on that assignment.like why did you used retrofit ,why MVVM ,whats the steps to implement mvvm in an application.why did you used serialized class here in this app . after that they asked me questions about oops .like what are interfaces.what is abstraction and whats the difference between interface and an abstract class. in the end he asked me a question on Recursion and dynamic programming .