B.Sc

You can work as either of the following after doing B.Sc in physics:
Lab Supervisor
Researcher
Technician
Teacher
Manager
Scientist
Consulting Physicist
Research Associate
Senior Physicist
Assistant Scientist
Radiation Oncologist
Radiologist
Professor

The eligibility depends on the type of course that you wish to pursue, the details of some courses is stated below:
Diploma Class 10th pass from a recognised board with minimum 40% marks.
Bachelors Degree: Class 10+2 examination with at least 50% marks.
Post-graduation degree: Bachelors degree from a recognised university with at least 45% marks.
Graduate & PG programs may also require you to appear in entrance exams such as NCHMCT, AIMA UGAT, E-CHAT etc.

Without pursuing pilot training course, you can't become a pilot.
You have to do both in order to become a good pilot. If you are planning to take Commercial Pilot as a career option then B.Sc Aviation may not directly benefit you except that you will have graduation degree and in long run based on your graduation degree, you can do MBA or any other PG degree.

You are advised to do B.Ed on completion of B.Sc to become a teacher. Once on the job, you may plan higher studies by joining PG degree or Diploma courses by distance learning for career growth and increased employability.

The entrance test for AIN Guwahati is held as a Combined Written Admission Test (C-What) conducted by ACDS, Secunderabad. The admission is strictly on merit ranking, based on marks obtained in C-What. Refer following link for further details: http://www.ainguwahati.org/