As you asking for the Interview of the Indian Institute of Science for Admission into the M.tech ECE let me tell you that the Interview panel Asked Some Personal and Techncia questions During the Interview the Presonal question includes About yourself your Areas of Interest Why you want to Join IISC Etc Some of the Technical question asked in the Interview are given below :

Technical Question are Asked :
Material used in heat sink: Aluminium
Design a digital circuit such that if number is divisible by 2 set a bit (Extra bit for indication) and reset if not.
Isometric projection of solid of which top view is given.
Here I am Also Sharing the Interview Expercines of the Slected Candidates During the Interview

Interview Experience of the Selected Candidates :
They will first ask about your area of interest. People generally go with Digital design hoping for easy questions. Don't make that mistake. Its not about correctness of your answers, they look at your approach. So go with the subject in which you are really good.

- Some panels dig deep into your final year project; be prepared for that.
- Expect some questions on system design. For example, one of my batch mate was asked for his approach on designing a smart washing machine.
I gave Analog electronics as my interest and Prof. M K Gunasekran was there on my panel who is one of the most respected proffesor in that field. He started with a game in which he would keep on drawing circuits until I find a mistake and correct it. When you are correcting circuits, he observes your approach very closely.
I was latter asked few questions on micro-controllers. I showed them a PCB I designed and they asked a few questions on that too.