How do I know what architecture My computer is Linux?

The command is uname -m . Open a terminal try using uname -m command. This should show you the OS architecture. If it gives any output like ix86 , where x is 3,4,5 or 6, Your OS is 32bit.

Which kernel architecture is used in Linux operating systems?

Linux can also be considered monolithic because it lumps all of the basic services into the kernel. This differs from a microkernel architecture where the kernel provides basic services such as communication, I/O, and memory and process management, and more specific services are plugged in to the microkernel layer.