Hi Neeraj,
If you wanted to work in Indian Space Research Organisation(ISRO) with B.Tech, then you can go for Mechanical, Electrical, Computer Science ,Electronics or Automobile Engineering.
The vacancies of Electronics and Computer Science are very large in number. One having these branches will have slightly more chances to get into ISRO.
You may refer to this article for more detailed information about ISRO recruitment.
I hope this information helps you.
Good Luck!
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