Things like 'Is [thing] a known/defined trope?' or 'Is this [item] a characteristic of [defined trope]?'
When I say trope, I mean it in the way it is commonly used on the TVTropes site (no link!) but not limited only to tropes defined on the TVTropes site itself, but literary Conventions and common story structures, character archetypes etc that may have been 'codified' in sources other than TVTropes.
As such I'm not sure if these would be
An on-topic "Contextual Question" (deals with the context in which science fiction and fantasy occurs: including ...etymology, and society. They have definitive answers about specific facts...)
An off-topic "Genre-Classification Question" (asks whether a particular work is SF or belongs to a particular subgenre, or ask about what makes up a subgenre. - are tropes subgenre-ish?)