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.

[EX Q]: Sentence: Youll buy fewer items in the long run, so youll save money as well as resources. 
Question: What day will you start saving money?
[EX A]: Yes.

[EX Q]: Sentence: Alexander II's death caused a great setback for the reform movement. 
Question: When did Alexander II die?
[EX A]: Yes.

[EX Q]: Sentence: They first traveled by plane around Europe, where they saw many different people and sights. 
Question: What happened after the planes would land.?
[EX A]:
No.

