"classic question" is correct and usable in written English.
You can use it to refer to a question that is often asked or is otherwise particularly noteworthy. For example: "What is the meaning of life? That is the classic question that has caused much debate."
This is another classic question.
For Romney, Ronald Reagan's classic question wasn't pointed enough.
IT IS a classic question: why don't airliners carry parachutes?
The radicals seemed to be confronted with a classic question: what is to be done?
Neuberger added: "It is a classic question of the rock and the hard place.
From government dietary research, they took data on the classic question: Do you think French people eat too much?
In 2000, the P = NP problem was designated by the Clay Mathematics Institute as one of seven Millennium Problems — "important classic questions that have resisted solution for many years" — only one of which has been solved since.
In the spring term of 1960, Sontag, speaking intently while she chain-smoked, demanded that the class confront classic questions of aesthetics, and insisted that we purchase a group ticket to the French dramatist Jean Genet's highly stylized play "The Balcony," at Circle in the Square, in Manhattan.
Practise small talk, but also rehearse what you will say in the opening moments of the interview when someone asks one of the two classic questions: "tell us about yourself," or "why are you interested in this role?" Do your homework and show real interest in the organisation.
First, the Coke Classic questions: When's the Mac version?
We quickly cover the classic questions that come with an engagement - how did you all propose?
