'What are your qualifications?' x 'What is your qualification?'
Are these two sentences gramatically correct?
?
What do you think?
The English would use 'qualifications' in general speech because they would be talking about qualifications that were non-specific (that is, they could be talking about anything from a doctorate to a swimming certificate). In this case, they are talking about the qualifications - both academic and non-academic - that a person has accumulated thus far in his/her life.
If they were to say 'What is your qualification?' it would be a specific - almost aggressive - question asking a person what right they had to think that were able to do a particular job or hold a particular position within, say, an organisation.
The two sentences given above 'What are your qualifications?' x 'What is your qualification?' are perfectly good sentences.
To get an idea of their meanings, here is some sample dialogue to put them into context:
[At a job interview]
Interviewer: Well, I see from your CV, that you have some impressive qualifications.
Job seeker: It was a great experience to study for my master's degree at Charles University in Prague. I really enjoyed my time there....
[At the scene of a car accident]
Policeman (to the passenger in a crashed car): And what is your qualification as a driving instructor, sir?
Summary
| 'What are your qualifications?' | 'What is your qualification?' |
| general speech | specific (almost aggressive question) |
| non-specific qualifications | specific qualification |