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Vasvati, To answer your second question
MS by research program is usually of 3 years in length. An MS student will complete all credits (Courses) same as M.Tech student sitting in the same class. The difference comes when it comes to work after class. MS students will be assigned a professor or can select a professor of their interest to work in his lab with other research students (PhD and other MS students).
M.Tech student have one year of course work and in second year they work on a project, seminar and dissertation. Where as MS students will have to complete course work in first year, during second year they may be asked to attend some courses regarding your area research or your lab area of research and the length of dissertation would be 2 years around. During this time MS students are expected to carryout research and come up with some research papers. You can see tips for writing good conference papers and research journal papers, which will really help you during MS program.
you may check the same here
http://www.inspirenignite.com/ms-by-research-in-iits-prospects-and-future/