Hello Shreelekha,

In my opinion, M.Sc in Life Science at NIT Rourkela would be a better option than the other because-

• If you study life science then you will have a wider scope in future, more kind of jobs that you can get.
• If you study virology then you will get restricted to that subject alone and you won't have a wide subject range of jobs available.
• NIT obviously has an established reputation and attracts companies to offer jobs to the students.
• If you pick NIT then you will have the degree of a highly prestigious institute. 

I would suggest you to go for M.Sc in Life Science in NIT rather that M.Sc Virology in National Institute of Virology Pune. However, if you are really passionate about the subject then you can go for Virology as well.

It completely depends on your interest.

Hope this helps.