There's certainly nothing objectionable about choosing a common language for a toy quiz like this. It did feel jarring to have the early questions be language-s

There's certainly nothing objectionable about choosing a common language for a toy quiz like this. It did feel jarring to have the early questions be language-specific, and the UTF question was sort of unknowable, but I got it by guessing what the most likely meaning of the syntax was. I was frustrated that language features felt trickier than actual coding knowledge in the early questions, but given that it's nothing with actual stakes there's obviously no harm in it.