Hi Harsh,

IISc Bangalore is a prestigious institute and the institute gives equal importance to all the streams. As for placements, IISc encourages research works and you can also go for further studies. Both Physics and Biology have equal importance in the field of research. IISc gives good placement opportunities, but pay wouldn't be very high. You can always opt for higher education. Pursuing further studies in abroad would ensure you a safe future in terms of money. 

All The Best.