B.Tech

Diploma Students are eligible to take admission through lateral entry into B.Tech in the related field.

None. There are no colleges with distance B.Tech and Online Exams. If that was the case everyone would have been an engineer by now.

DU-IICT is a better choice. The placement is good in DU-IICT and the scope is higher too. CU is also a good college but in comparison with DU's faculty it doesn't have as good.

Distance Education in B.Tech is not possible but you can pursue B.Sc. Easily through distance. You can also pursue Part Time or Evening Class B.Tech courses near your workplace. But since you have done Diploma in Chemical I would recommend getting admission in B.Sc. Chemistry. You can also get lateral entry in some colleges.

You need to have Diploma in related field to be eligible for Lateral Entry into B.Tech in any college. The admission again is dependent on the number of seats available.

Foreign students can take admission in this college but the course is not available online. B.Tech CSE is a full time regular course and you will need to attend college.

Your fee for M.Tech in power electronics will be around 80k per year.

Yes, you can get admission in IIST if you clear Mains.

The best government engineering colleges in India apart from IITs and NITs to pursue B.Tech are-
1. IIIT
2. DTU
3. GGSIPU
4. NSIT.

First of all, I want to say that you have to clear your cutoff for getting any government college. But still a chance to got admission, which depends upon your catagory and your 12th scores. In last few years, there are many seat goes vacant in many NITs and GFTI. So, if you are going till spot round, then there is little bit chance to got NIT.