deep subject knowledge required to crack a project jrf position at csir labs in field of life sciences. if you have done any dissertation in your master's then the questions they will ask is around that area.

I applied through AcSIR. Interview was held at CSIR NPL New Delhi . There was only one round .Questions was related to Physics,Maths and basics of Energy.In panel one professor from IIT Madras was their and 3 Scientist form CSIR .Each of them asking questions from their domain.