online B.Tech

It will be notified on official website itself regarding the open counselling
Keep checking.

Hello Piyush, it's very heartening to know that you still have the spark to study even after 25 years of work experience. But I am afraid that these days no professional course including engineering can be offered online buy any university in India and as a result you cannot think of doing graduation in chemical engineering by distance education mode. However you can do AMIE which is equivalent to graduation in engineering for all practical purposes. Best wishes to you.

AICTE has banned the online or distance B.Tech courses, Hence never be pursue. Because online or distance B.Tech courses are not valid for employment and higher education purpose.

Hello Seenu S.
If you have the following eligliblity you can go head.
The Qualification For B.Tech is to Pass in 10+2, or equivalent with Physics, Mathematics, and English as compulsory subjects along with Chemistry or Biotechnology or Biology or any technical vocational subjects as optional with a minimum of 50% marks taken together in Physics, Mathematics and any one of the optional
Click on the link for more details:-https://www.shiksha.com/college/wsmtn-wisdom-school-of-management-tamil-nadu-tamil-nadu-other-37022.
Thank you.

You can pursue your B.Tech in civil engineering via distance education program.
https://www.shiksha.com/b-tech/colleges/distance-correspondence-b-tech-colleges-chennai

Dear friend, as per my experience and knowledge, B.Tech in 4 Year programme and MBA is of 2 Year programme, whether you do online or offline. It depends on you, but as per my views there is no online facility for these courses, you have to go in universities and get admission into it.

The exam pattern of NATA 2018 also states the type of questions that will be asked in the entrance exam, which will be conducted in online (Part A) and offline (Part B) modes.

The exact dates for entrance exam forms availability is still not out. For more details, check out the link below:
https://www.shiksha.com/science/course/m-sc-in-food-science-and-technology-shivaji-university-maharashtra-other-285998

Yes, you can take admission but after admission, you have to show your certificates to the institute (when you receive them) for further verification on the day of joining the institute.