There is no such thing as 'middle level language'.
Yes. C and C++ are both considered medium level languages because they both allow low and high level programming. However, both are regarded as being high-level languages because, strictly speaking, there is no such thing as an intermediate level language.
Yes, it is a High-Level Language
Yes, the level of difficulty in runescape is medium.
Yes, C++ is a high-level language.
yes, java is high level language because to run it we requires jvm interpreter. In case of c language there is no need to interpret it...
yes
Yes.
yes
Yes, SQL is a high level language, since it allow us to get result without much going into Assembly level instructions, by using interpreter to change our statements/queries into machine level instructions!.
yes
Yes. Any language that does not closely resemble the machine code is a high-level language. The more abstract the language, the more high-level it is and the more complex it is to translate into machine code. Logo is highly abstract; it bears no resemblance whatsoever to machine code, therefore it is high level.
It varies from language to language, but usually yes.