How long have you been in these fields?
Whenever you ask a question, be as specific as you can. So, ask by name: for example, in the field of material science.
Now, material science is a very broad area; if you have some other specific area in mind, put it here.
I can say that I have not worked or held a job in this specific area but I have some interest in this area for a long time. I have taught and studied in this area.
So it helps being specific here again: ask about work experience, studies or course work, trainings, research etc.
being an engineer offers a lot of job opportunities; what made you choose this field?
I have always been interested in materials!! (this is a personal question because whatever may be the answer, you have to accept that)
You should rather ask: material science is a vast area to master; what exactly you can contribute to our organization?
By the way, I consider that job opportunities are poor in ALL areas equally (more or less) because the system adjusts proportionately.
Would you recommend the field of materials science to future electronics engineer
I shall stress on the fundamentals. Like:
1. Is the candidate willing to learn new tools and techniques?Would you recommend the field of materials science to future electronics engineer
2. Is the candidate has a good grasp of the basics?
3. Can the applicant read a circuit diagram and explain it quickly (without referring to books)?
4. Has he broad interest in the area?
5. Can the candidate explain a low pass filter? Norton's theorem? Operation of a transistor?
Yes, it is not difficult to be an electronics engineer. You only need to study well.