Following are some of the popular job portals:

General job portals:

http://www.employmentnews.gov.in (Employment News website)

http://www.naukri.com/

http://www.monsterindia.com/

http://www.careerbuilder.co.in/

http://www.yuvajobs.com/

http://www.timesjobs.com/

http://in.jobstreet.com/

Science & Technology job portals:

http://www.sciencejobs.org/

http://www.newscientistjobs.com/

http://www.go4engineeringjobs.com/

http://careers.the-scientist.com/