When being sworn in as a witness... you are asked the following:?

Probably. I think the whole "tell the truth" thing is more for the juries than anything else. If someone's not going to tell the truth on the stand, either the prosecution or the defense wouldn't use them as a witness.

If you were subpoenaed you could be held in contempt.

Never saws a witness who was not subpoenaed.

actually I got a number of judges in my jurisdiction to remove "whole truth" from the swearing in since I could only answer what was asked of me and therefore could not tell the whole truth, only giving a truthful answer.

If you have religious reason not toe "swear" they have you "solemnly affirm".

The witnesses are spoken to before they are put on the stand anyway.

Before they even enter the courtroom.

If the defense or prosecution get the slightest hint , they were going to be uncooperative, They would not even make it to the stand.

Furthermore. If the person, maintains they will not tell the truth. Then they have something to hide.

In which case, they are not a witness. They are the person who needs to be prosecuted.

you would probably be held in contempt of court if you said that. if you have religious reasons to not "swear" you can say that you "affirm". if you are trying to get of talking on the stand you could plead the fifth, just give a good reason though( you have the right to not say anything incriminating about yourself, you could say that you fear for your life if you talk, etc.