Hello Ranjita,
You are eligible to apply to appear for the GATE 2019 exam. Since, you have completed your B.Sc. in Physics, if you wish to pursue your career in M.Tech Physics, you are free to apply for the exam.
The eligibility criteria of appearing in the GATE 2019 exam be read from this article. You are advised to kindly check the following link once: https://engineering.careers360.com/articles/gate-eligibility-criteria
Please feel free to comment below for further assistance.
All the best!
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