Woof, I am sure what I said is correct. Have a look at the legislation.
www.legislation.qld.gov.au/LEGISLTN/CURRENT/E/EvidceA77.pdf scroll to section 10
PS Hope his link works, it is my first attempt at a link! Just in case it doesn't I have cut and pasted the relevant section below
Evidence Act
10
Privilege against self-incrimination
(1) Nothing in this Act shall render any person compellable to answer any question tending to criminate the person.
There are further provisions dealing with the accused person giving evidence and rules about what they have to answer that are different from a witness.
EDIT, any question that would not tend to criminate the person must be answered (or face contempt of court). The judge would send the jury out of the room while a discussion went on about whether the answer would tend to criminate or not.