if u r very confident with math & physics, can solve difficult calculus & trigonometric stuff without a hitch and can score good in exams in those, then u should sure go for B.Sc -> M.Sc and maybe even higher.
just remember, doing a B.Sc only wont take u much further, and M.Sc or higher degrees in physics are for good studious academics only. if u have that confidence, jump for it, if possible, with integrated M.Sc with some reputed university. our country really needs good academics and researchers.
B.Tech on the other hand, is career centric, if u want to go academic / research lines, then again u must find a way to a reputable university via M.Tech. electronics/electrical B.Tech course offers a lot of physics & maths, as well as computer papers, but again u will end up being somewhere in IT or small core industry or may even become the hammer wielding network guy (engineer
) at some cellfone or network company, unless u are a math wizard with strong determination to go explore new horizons and capable of proving urself eligible in all competitive exams (a bit of good financial support is always better).
best of luck, choose wise.
p.s.
I like physics, and electronics in general. I love experimentation, tearing things down & checking how they work. I enjoy reading Physics related topics, so I was considering Electrical+Electronic Engineering; but the field seems to be saturated and will be difficult to work in unless I pass out from a very good college. The alternative is now a BSc in Physics, and many say there is a lot of scope for research; which is why I was asking about it.
If I do engineering it's not because someone told me to, I like related stuff, and am also drawn to Physics, so both of the options are based on my own choice.
having only "interest" is not good enough. unless u re very good at math, u wont be scoring good and not good scores don't provide opportunities. a lot of people dont have good scores, but have interest in physics & maths, it is fine as hobby, but there is a career u will need to support ur life first.
B.Tech in electronics / electrical graduates get
almost all the opportunities a B.Sc physics guy does get except a few. i think u can even do M.Sc physics at some universities, if u have B.Tech in electronics / electrical, not sure though, u must check urself.