How does the addition of のか to the end of a sentence affect the meaning?


I've always had trouble understanding か (question particle) in casual speech.
I read that in casual situations, か can be used to give the sentence an
exasperated or sarcastic tone. Like in:

負けっかよ！ As if I'd lose!

I think that I understand that usage reasonably well. What confuses me however
is when か is used with a sentence that clearly should be a question (i.e. it
has a question mark or a question word). For example:

やってみるか？ Want to give it a try?

I believe I've read that か is unnecessary (and not used) in casual speech to
ask a question and questions are simply conveyed through a rising intonation
or the addition of の（だ）. Could someone explain how is the above sentence
different in terms of tone or nuance from the same sentence omitting か
「やってみる？」?

Furthermore, on a similar note I believe, the sentence final particle
combination のか？！ seems to occur frequently. I'm not really sure what to make
of this one. I thought の might be the explanatory の but how can one both
explain and ask a question? For example:

そんな嘘にオレがだまされっと思ってんのか！？ Do you think I'd be taken in by a lie like that?! (I'm
not confident of this translation)

How would that sentence's meaning be affected if it were instead:
そんな嘘にオレがだまされっと思ってんの！？ or そんな嘘にオレがだまされっと思ってんか！？

Thank you very much for reading my post to the end : ). I know this question
isn't that specific but any and all help is appreciated. Thanks again!




Your translation was correct in meaning.

> そんな嘘にオレがだまされっと思ってんのか！？

I think the latter is the more colloquial version of the following:

> そんな嘘にオレがだまされっと思ってんですか！？(or思ってるんですか)

So this:

> そんな嘘にオレがだまされっと思ってんの！？

has the same meaning with perhaps less inquisitive emphasis, while this:

> そんな嘘にオレがだまされっと思ってんか！？

sounds less natural to me. I think one could say the sentence in the last way,
but it becomes very slangy, almost to a rarefied extent. (perhaps it would
sound immature or "country" to a native listener, but I lack the expertise to
say)

So in conclusion, yes, you can make a sentence a question simply by altering
the tone of the words, but obviously adding か makes it a more "complete
expression."

ex.:

> これ食べる？ You eat this?
>
> これを食べますか？ Do you eat this?




Your translation was correct in meaning.

> そんな嘘にオレがだまされっと思ってんのか！？

I think the latter is the more colloquial version of the following:

> そんな嘘にオレがだまされっと思ってんですか！？(or思ってるんですか)

So this:

> そんな嘘にオレがだまされっと思ってんの！？

has the same meaning with perhaps less inquisitive emphasis, while this:

> そんな嘘にオレがだまされっと思ってんか！？

sounds less natural to me. I think one could say the sentence in the last way,
but it becomes very slangy, almost to a rarefied extent. (perhaps it would
sound immature or "country" to a native listener, but I lack the expertise to
say)

So in conclusion, yes, you can make a sentence a question simply by altering
the tone of the words, but obviously adding か makes it a more "complete
expression."

ex.:

> これ食べる？ You eat this?
>
> これを食べますか？ Do you eat this?

