It's probably asked in an airline interview to see if you have any understanding of aerodynamics. Someone who doesn't understand inverted flight probably doesn't fully appreciate the importance of angle of attack and g loading. If I were conducting an interview I'd be interested to know whether the applicant could tell me under what conditions you could be flying at 5 knots IAS and NOT have a stalled wing. It's all related, and all shows whether someone understands the stuff or just memorised some answers for an exam once upon a time. Given the topical nature of stalling in airliners at the moment, I'd like to know that the pilots I was hiring had an understanding of what the wings are doing.