Physics

Hi,
Nanotechnology is the branch of technology. It has a huge scope in the upcoming generations. It is the third the highest booming field when compared with IT and Internet. In India, Bangalore and Chennai are the manufacturing hub for IT and Medicine. The Indian government has already started Nanoscience and Nanotechnology initiatives and various funding agencies like the Department of Science and Technology.
Best of luck.

It may be noted that the syllabus for most M.Sc. Entrance exams incude candidates B.Sc. (Bachelor of Science) course material. Therefore, if candidates are thorough with their B.Sc. Syllabus and have a clear understanding of the concepts studied during graduation, there are high chances of clearing an M.Sc. Entrance exam with a good score.

Hi, since you are from a different university you are not eligible for admission through merit basis and you'd only get admission through an entrance exam. The forms for registering for DU is available in it's official website, do check them soon.

Afaik,
I believe the following institutions across India are the best for pursuing careers in physical sciences-
IISC, Bangalore (through boards, JEE, KVPY)
IISER (same as above)
NISER (through NEST)
St. Xavier's, Calcutta & Presidency University (boards & entrance, respectively)
University of Delhi (board marks based).