ISRO CENTRALISED RECRUITMENT BOARD opens vacancy options for the MSc graduates in the Subject of Electronics, Physics and very rarely Mathematics. So yeah! You can give the examination for that you have to keep an eye on the official website of ICRB to get the updates.

Apart from this if you are from Mathematics, Physics, Chemistry then you can also apply for the BARC, DRDO examinations as well. BARC recruits a lot of Physics Post graduates.

For the ICRB official website, visit:

https://www.isro.gov.in/careers

I hope this answer helps. All the very best for your future endeavors!