The phrase "question on topic" is grammatically correct and can be used in written English.
It is typically used as a way to describe a specific question related to a particular topic or subject. Here is an example sentence: "During the Q&A session, the speaker only answered questions on topic and did not stray into unrelated subjects."
You can also send out comments or questions on topics to encourage a dialogue with people in your network.
Mr. Matthews and the students asked questions on topics as diverse as Elian Gonzalez, police brutality and AIDS.
Meeting with employees, she answered questions on topics ranging from transportation in the Southern Tier region of the state to federal spending on research and development.
The Interior Ministry has published a catalog of 300 multiple-choice questions on topics like life in a democracy, history and responsibility, and human beings and society.
Send us your questions on topics from mental health and wellbeing to employment rights and we'll get answers from our expert panel.
He fielded dozens of questions, on topics like a continuing national debate over adopting daylight saving time, taxes, pensions and Russia's position on the war in Syria.
Answering questions live from Twitter's offices in New York City, Mr Trump instead faced questions on topics ranging from his hair to the alternative meaning of his surname in Britain.
They were also asked a series of survey-style questions, on topics ranging from their thoughts on the riots to their attitudes towards police – each of which was taken from a larger social survey for the purposes of comparison.
He also means dialogue literally: he spends most of his ArtWalk time fielding questions on topics like what cameras he prefers and what his studio used to be (a storage area for hot-dog carts, among other incarnations).
He fielded questions, on topics ranging from Pokémon Go (it seemed harmless, he said) to Black Lives Matter (he urged the pastors to think harder about perspectives that were "invisible" to them).
