I think you mean 'Did you tell him the truth'? and 'You told him the truth?' and they're basically the same question, except that the first one poses it as an normal question, so it implies that this person doesn't know at all whether the person they're talking to told him the truth or not, and the answer could be either yes or no. Whereas the second one is just a statement said with the tone of a question, which implies more that the person speaking is fairly sure that they told him the truth, and just wants to clarify. I'm sorry if that was a bit of a complicated explanation :) And there is no difference really between how people speak on TV and in movies and in real life, both phrases can be used in either.

True means not false, or real. Truth means the actual state of something; a fact. Trueness is not the truth,

Both of them are correct, but i think the second one is non-standard ( when we ask about something in simple past tense we are supposed to use 'did' or 'was/were' . The meaning of them is the same.