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correctly answered questions bring you one point, for wrong answers you lose one point. The answer "Don't know" is neutral.
To which operating system is GNU+Linux compatible?
Unix was chosen, because it was the only portable operating system at that time.
What is the origin of GNU+Linux?
By 1990 the GNU system was an almost complete operating system. The only missing thing was a kernel.
You can learn more about the history of GNU under http://www.gnu.org/gnu/gnu-history.html
What has Linus Torvalds developed?
What is the mascot of Linux?
On what kind of machines is GNU+Linux running?
Does the system have a graphical user environments?
Some well known environments are GNOME, KDE, XFCE and WindowMaker...
GNU+Linux and most of the software for it is "free software". What does that mean?
Free Software means freedom, not price. That means you can charge any deliberate price for it, you just may not among other things forbid copying.
It is true, that the source code must be made available, but that alone is not enough. That is a just precondition for the freedom to read or modify the software.
Free Software is free, when the user has all the freedoms - no matter with which development model the software was developed.
Read more about this topic under http://www.gnu.org/philosophy/free-sw.html
In which programming language are the basic elements of GNU+Linux written? (the kernel, and the GNU tools like bash, tar, gzip and so on)
Which of these programming languages do not exist for GNU+Linux?
Which kernel was created in the GNU project?
The HURD was started around the same time as Linux. But the development was largely retarded due to some difficult design decisions and because Linux was already available. It took more than ten years for HURD to run and it is not stable until now (2005).