Marking on mcq question paper

I agree that there is no specific rule but there are clear instructions that you should not write anything in the question paper please kindly see point no. 20 in 7th page of IPC (Old Syllabus) hall ticket mam.

But I think it will not be a issue at all marking in the question paper but its better not to mark on it either on descripttive paper or on objective paper and more importantly on objective paper