The trick with this question is to translate it into the relevant parts immediately. The examiner has written a story to increase confusion and test the candidate's ability to pick out important information, which also happens in lots of other ATPL questions.

This question can be translated into "what are the two main tasks of the airborne weather radar?". The two main tasks of the airborne weather radar (AWR) (see learning objective above) are detecting significant weather in order to avoid it and to use for ground mapping (which used to be very common use of the AWR but is less used these days).

The question also mentions the tilt control knob but does not actually ask a question related to it, it is just part of the story.