How can I apply for ISRO? What is the eligibility criteria of the same? I am B.Sc physical science student.

The minimum qualification required to join ISRO is B.Tech. ISRO mainly recruits post graduates like Master's degree or Ph.D holders from fields of Science, Technology, Applied Science, Computer Applications, Commerce, Administration, etc. On the graduate level, ISRO recruits only engineers i.e. BE/B