DT November 2017 Exam Paper

Alright if thats the case i got that point wrong but all the other points were right and i gave all explanations with proper presentation. Will they strike off the entire sum ?

Our Perspective & our thinking is something which makes us feel that paper is tough, but please all think from the perspective of our institute..what it want wants from us.? Especialy for DT/IDT apart from hardwork and practice,what you need is "PRESENCE OF MIND", how we apply it in our all papers would decide the rest.