M.Sc Scope

The scope is less, but still if you're an above average student then you can go for government job preparation.

Yes, you may be eligible to apply for M.Tech.
After completing M.Sc. In Physics, you may be eligible to apply for M.Tech after clearing an entrance exam, i.e. GATE.

After completing your B.Sc Course in Physics, there are many career opportunities open for you, such as research analyst, a teacher, lab assistant etc. But, if you go with a further study such as M.Sc. Degree, M.Sc Ph.D dual degree, Joint M.Sc. Ph.D. courses then you can become a scientist and apply for CSIR NET Exam also.

Courses in B.Ed colleges in India are from two years to one year. The duration of B.Ed course was extended from 1 year to two years in 2014.

It depends upon your cv, while the course is very good, but if your college reputation is not good or your academic performance is poor then you should not expect a good placement.

Yes, you can apply for the exam.