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I can't pick one but I can give you details. What you'll get if you take ECE. First year of electronics and communication engineering course is dedicated to teach students about basic engineering techniques such as engineering mathematics, physics, chemistry and engineering drawing to name few. From second year of studies student start to learn about core Electronics and communication engineering subjects like digital electronics and logic design, fundamentals of communication engineering, electronic circuits, signals and systems, power electronics, applied electromagnetic theory, integrated circuits, VLSI, control systems and computer architecture are just few to mention. Electronics and communication engineering course give enormous job opportunities in electronics and software companies. All electronic devices need software interface to run and come with one other or other device controlling programs architected and developed by electronics and communication engineering. It also gives great opportunities for research and development, as everyday consumer need new devices to support them in daily life. Core companies offering jobs to Electronics and Communication Engineers:
Bharat Electronics Limited (BEL), Electronics Corporation of India Limited (ECIL), Intel, Samsung Electronics, Sony, Toshiba, Philips Semiconductors, Texas Instruments, LG Electronics, Nokia, AMD, CISCO, Nvdia, HP and IBM are just few to mention. Becoming electrical engineer
An electrical engineer is someone who designs and develops new electrical equipment, solves problems and tests equipment. They work with all kinds of electronic devices, from the smallest pocket devices to large supercomputers. Electrical engineering deals with electricity, electro-magnetism and electronics. It also covers power, control systems, a bit of telecommunications and signal processing. These engineers are usually concerned with large-scale electrical systems such as motor control and power transmission, as well as utilizing electricity to transmit energy. Electrical engineers may work on a diverse range of technologies, from the design of household appliances, lighting and wiring of buildings, telecommunication systems, electrical power stations and satellite communications. They may plan their designs using computer-aided software or they may also sketch ideas by hand. Some Companies for EE
Agilent Technologies Pvt. Ltd. Reliance Communication Pvt. Ltd. AbsolutData Res. & Analytics Pvt. Ltd. AC.

Kannan don't go with which stream is better. Go with what you want do after studying B.Tech. You may take following considerations. If you like computer, want to build crazy application or something related to software go with Computer Science engineering. If you like playing with machines/motors or electricity go ahead with Mechanical engineering. Or Electrical engineering. If you are India, after studying Electronics and communication engineering most of the students gets job/work in IT companies. Only few percent gets chance in electronics companies. So I would suggest, better to study Computer Science engineering. If you want to sail through vast sea go with Marine engineering. If you have not decided what you want to do after B.Tech, sit for one or two days and decided what you want to do. If still confused, select any of the engineering mentioned in point # 1, 2 and 3 (Computer Science, Electrical, Mechanical, or Electronics). Best of luck.

Biotechnology has wide scope and has its own importance and need. You ll find many opportunities. Job depends how you did any biotechnology course and how much expertise you have in your subjects. Your mastery and your expertise in the field decide your growth. If you have good command over your subjects, you have sufficient Practical knowledge, you are good at soft skills then, nobody can stops you from getting a good job. Go for the college which are good in terms of education and placements. Biotechnology provides a firm basis for pursuing a career in any aspect of Science involving food, pharmaceutical or environmental sectors, molecular biology, genetics, biochemistry, nanobiotechnology, use of microbes, DNA vaccines, production of new materials using new ideas, new drug-delivery systems, organ transplantation, rational drug design, nutraceuticals, plant-based drugs, enzyme engineering and technology, stem cell techniques, and tissue culture. Biotechnologists can find employment in a wide range of industries like food processing, breweries and pharmaceuticals. Also, the M.Sc. Degree is an acceptable qualification for applying for a Ph.D. Companies, Institutions and labs: Following is a list of companies, universities and research institutions that are renowned in India and worldwide for their work in Biotechnology and allied fields. Pharmaceuticals: Biocon, IFGL Bioceramics Limited, Orbees medical, Invitrogen, Glaxosmithkline, Reliance life sciences, CTS life sciences, Dr. Reddys labs, Cipla, Jubilant life sciences, Wockhardt, Torrent pharma, Cadila healthcare and Ranbaxy. Universities and research institutions: IISc, TIFR, JNU, LPU, DU, IITs and IISERs. Research institution: Center for Cell and Molecular Biology (CCMB), Council for Scientific and Industrial Research (CSIR), Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), National Centre for Biological Sciences (NCBS), CSIR - Institute of Genomics and Integrative Biology (CSIR-IGIB), National Institute of Plant Genome Research (NIPGR), National Institute of Oceanography (NIO), National Brain Research Centre (NBRC), National Environmental Engineering Research Institute (NEERI), National Chemical Laboratories (NCL), National Centre for Cell Science (NCCS), Rajiv Gandhi Centre for Biotechnology ( RGCB), Institute of Microbial Technology (CSIR-IMTech), MS Swaminathan Research Foundation (MSSRF), National Institute of Immunology (NII), AU-KBC research centre.

The scope of metallurgical engineering :
Anybody with an interest in Science, Technology, and Engineering can take up metallurgical engineering as it brings together all these branches. Metallurgical engineers are required in every industry and enterprise that produces, buys, sells refines or manufactures metals or metallic products. In India, young metallurgical graduates can expect some exciting career opportunities in government undertakings as well as in private companies. Apart from opting for industrial jobs, one can also join as a research fellow or an associate or a scientist or professor in various labs and universities located in India and abroad.