Is it possible to create new machines after completing B.Sc?

The number of questions in each subjects are generally not same, but the total number of questions mostly ranges from 17 to 18 across all three subjects in both Paper 1 and 2. The number of questions will also be different for each type (MCQ, Matching, Single/Multi correct) within the subjects in paper.

No, same questions never get repeated in IIT JEE exam. However, questions with similar concepts can find places in the exam. The question paper of JEE Advanced is prepared considering the syllabus and exam pattern.

You will not be eligible for admission as preparatory ranks are not considered under round 1. Since you have already qualified to appear for JEE (Advanced), all you need to do is meet the second criterion and apply for round 2, which will be only conducted if seats from round 1 remain vacant.

Yes, you can still get admission in Round 2 if you meet eligibility criteria to appear in JEE (Advanced) and have a valid JEE (Mains) rank. Also, you must have scored 60% or above in class 12th. For SC/ST/PwD category students, 55% or above is required.

No, candidates need not pay any fees to participate in JEE Adv counselling. However, once the seat is allotted, candidates will need to pay approximately INR 35,000 (less for reserved category) as a seat acceptance fee and around INR 20,000 as partial admission fees. Both these payments are adjusted in the final fee payment of college.