hi,

see the requirements and the qualification or branch of m.tech will be decided whether you will be eligible for btech related job or not. see after completing msc in physics one may do mtech on control system, but no companies like general electric or siemens or power grid never hires such candidates who does not have b.tech in electrical or electronics engineering. now coming to mtech in computer science engineering again you have decent chances to join in IT companies , because companies like tcs, infosys recruits candidates who are not from btech background but have done m.tech on computer science. so its depends on your stream on which you are doing you m.tech, however now a days not only your degree can land you a job, also you need to have good understanding of the profile for which you are applying for a job.