Indian Institute of Technology, Delhi

Hi Yogendra,
For admission in IIT Delhi, you must target a score more than 180 in JEE Advanced.
All the best.

Hi Yogendra,
For IIT-Delhi, you need a really good rank, which should be less than 2500. For this, you need a score more than 180 marks in JEE Advanced.
All the best.

It can not be assumed as it will depend on the number of candidates and the level of questions.

For pretty obvious reasons, only the marks you get in IIT will be given weightage when an interviewer is hiring, just like while giving admission into IIT you are not asked about your marks in primary grade.
The recruitment procedure depends mostly on the interview you give and the technical skills and knowledge you possess. However, your CGPA in IIT helps you in getting to the interview as in the per-interview selection candidates with low CGPA are mostly screened out.

IIT-Delhi admits through JEE Advance score, not JEE Mains, but you need to get through Mains to sit for Advance and to get admission in IIT-Delhi you need to be amongst top 200-300 students in JEE Advance.

No, IIT's give admission solely on the basis of JEE advanced rank.
However, you can apply to other government as well as some non-government colleges with the JEE Mains rank.

Hello Daksh,
IIT D is one the most premier IIT. Therefore, you need to score better for admission here. I feel a percentile of 75 or more should get you admission here.
Best wishes.

Hi Vikash,
Normally, IIMs will close their admissions in between 90 to 99.99 percentile. The other private business schools and IITs MBAs close their admissions in between 85 to 93 percentile.
All the best.