Questions with ~か or without: how to choose?

Question

Studying Japanese on my own, I've learned that in order to make a question, you usually add the particle "~か", like this: > 今何時ですか。 It's also true that a question can be asked without it, using the rising tone of voice. But then I found out that in certain contexts, the use of "~か" can be seen as sarcastic. My questions are: 1. Is this actually true? 2. And how do we decide when to choose which alternative? Reference sites are appreciated.

Answer 1

For proper Japanese writing, all questions has to add “か” at the end of sentences. But for on conversations, we use causal sentences and put the end higher tone without “か”.

For the sarcastic case, could you describe an example sentence for me?

Answer 2

It would have to depend on the tone of voice or context, but it could. Watch Japanese media to kind of get the gist of the actual tone.

KA is also dropped frequently in casual speech. Raising the pitch of your voice (like in and English question) or other sentence-ending particles (NO, KAI) could also be used to in its place. Sometimes just a question word (who, what, where, etc.) can be enough (Nani sore?) to make a question.