A question that is free of any grammatical or logcal errors, should be labeled 'yes', otherwise it should be indicated as 'no'. A question is grammatically correct if all its entities i.e. nouns, verbs, adjectives, prepositions, pronouns, adverbs are at appropriate position. A question is logically correct if the semantic makes sense.
One example is below.
Q: Sentence: Jack played basketball after school, after which he was very tired. 
Question: How long did Jack play basketball?
A: Yes.
Rationale: All entities are in appropriate position and the question makes sense, so its grammatically and logically correct.
Q: Sentence: You can clearly see the same rock layers on opposite sides of the canyon. 
Question: When did they canyon split?
A:
No.