Hey everyone. First of all congratulations to everyone who qualified for the next phase. Don't forget it was the easiest phase so be prepared for the next stage.
I'm sharing the pattern of descriptive test from past paper of AD MoD. I think pattern will same for all the posts (difficulty level may vary for lower posts but pattern will be pretty much same).
Total time 3 hrs
Total marks 100
2 portions
Paper A will constitute of Mcqs. Mostly general knowledge based, for example:
UN Hq is in?
UNO was established in?
Name of US secretary is?
Total seats in NA?
Total area of Pakistan? Etc
These are all from past paper. I think no of mcqs will be around 20 (not sure though)
2nd portion has around 6 questions out of which you'll have to attempt 5. All of these questione are based on current affairs (national & international). For example:

During the last two decaded Indo-Israel ties have developed into stragetic alliance. Evaluate Indo-Israel relations and its effects on Pakistan. (From the same paper)

Hope it helped.