Forbes' and the author of "The Apple Experience: Secrets to Building Insanely Great Customer Loyalty," reports that the first question is: "Do they display grit?"

In other words, does the candidate demonstrate courage and confidence, but without arrogance? "A person displays grit when they acknowledge that they don't know but are determined to learn," says Gallo.

The second of the three questions is: "Can the candidate offer a Ritz-Carlton level of customer service?"

To answer this, an Apple hiring manager might ask: "Has there ever been a time when a customer asked for something you could not provide at that moment? How did you handle it?" says Gallo's report. In order to be successful, the candidate should reply with an example in which they use some of Gallo's 'Five Steps of Service'. These are: approach customers; probe politely; present a solution; listen for and resolve issues or concerns; end with a fond farewell and an invitation to return, he claims.

The third and final question is "Could the candidate have gone toe-to-toe with Steve Jobs?"