1) what about those who say Allah is settled( istiqrar) above the throne without contact or touching etc ??
Answer: To settle means to become still after moving. If this is what they understand from it, then it is kufr.
2) which category of verses do the sifat of Allah fall under i.e figurative or clear ?
Answer: It depends. When it says that Aļļaah knows everything, then this is clear, but if it says wajhu Aļļaah, then this is not literally meant, and there are several possible meanings. The reason why it is not clear, is that the literal meaning of wajh is “face,” and a face needs a creator to specify its form. Since Aļļaah is not created, He does not have a face. The meaning of wajh then, must be some other meaning than face. Some of the scholars chose to interpret the word wajh, while others preferred to remain silents about the meaning.
3) do we know the meanings of the sifat of Allah??
Answer: To a certain extent, but never the complete reality. For example, I know that Aļļaah knows everything, but I don’t know the reality of His knowledge; I cannot know more than that. I do know, however, that it does not involve a brain or another place or container or instrument. I also know that it does not change or develop, and that it is flawless and unlimited.
4) we know the meaning when we say Allah is attributed with hearing etc. but when we say Allah is attributed with yad, istawa, etc. ,do we know what they mean?
Answer: We know they are not literally meant and we know some possible meanings according to the Arabic language, but the reason why many scholars preferred to keep silent about their interpretation, is that there is more than one possible meaning and they were not sure which one is meant. They preferred therefore to stay silent in order to avoid speaking about Aļļaah’s attributes based on what they could not be certain to be correct. This is why you see, on the other hand, some interpret with confidence what others consider to be ambiguous. What is ambiguous to some, is not ambiguous to others. Moreover, some engaged in specifying an interpretation in their teaching in order to prevent people from thinking of the literal meaning. See also this article, and this one.