Nano Technology and Robotics

Biotechnology is a rapidly developing field. Many private businesses are exploring this field and heavily investing in it. It is safe to say that there are ample job opportunities for BE/B.Tech in biotechnology graduates in private sector. And, government sector too offers them job opportunities, but not in the scale in which private sector does. Average starting salary is generally between 2.4 to 5 Lacs per year.
Some prominent industries where biotechnology professionals may find jobs are- Pharmaceuticals Industry, Healthcare sector, Chemical Industry, Agriculture sector, Food Processing, and Technology as well as Research sector. Graduates may also take up teaching job (as a lecturer) after completing ME/M.Tech programme.

Scope of Nanotechnology in India is still in the development stage for Nanotechnology and it will take quite a few years for this field to become established in India. Research labs and institutions such as IISc, TIFR, NCBS, IITs etc are performing excellent research in India. However, when compared with countries such as Germany and USA, output of high quality research pales significantly. This is due to several reasons such as lack of integration between different departments for R&D in Nanotechnology. If you are interested in working in the Nanotechnology industry you may have limited options.
India doesn't offer any special, or unique advantage for the major firms to do R&D there, and if they do R&D in India it won't be the primary kind (for example, there is no way Samsung is going to have a heavy duty R&D center in India, why should they? Samsung, Philips, Siemens, Intel, etc.all do core research in US or their home nations).
Lastly, smaller companies just can't develop the infrastructure needed for nanoelectronics, and this is probably more true in India, resources are even more scare.
Although we have a craze for building smaller and more efficient machines. Thus the need or nanotechnology in various fields, defence, medicine, security, agriculture related etc. It is an emerging area which will in all probability (99.99%) will be a booming sector like cybersecurity, electronic warfare etc.
Nanotechnology is doing very well abroad in nations such as USA, UK, Singapore, Germany, China etc in terms of R&D. There has been significant development towards the usage of Nanotechnology in cosmetics, food and textiles. Nanomedicine is still in the R&D stage and widespread growth is yet to be expected and intensive research is being conducted in breakneck speed.
If you are interested in the engineering part of Nanotechnology, choose either chemical engineering, mechanical engineering, electrical engineering or biotechnology and then M.Tech and PhD in Nanotech to make a suitable career in nanotechnology.
If you are interested in the sciences part of Nanotechnology, then a B.Sc degree in either physics or chemistry will suit you perfectly. BBSc students can follow up their degree with M.Sc degree in Physics/Chemistry/Electronics etc and then a PhD in Nanotechnology.