is it necessary to opt highly reputable colleges for B.sc in physics?

Reputation of the college always helps in the longer run both in getting admission for the higher course and for getting a job. It is not necessary that you do B.Sc. physics in a highly reputed college, but it would be helpful if you do so. If not, then at least do M.Sc. from a better known institut

University recognised, UGC approved colleges and courses must be pursued. Of course the name and reputation of a college will help you stand ahead