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No motherboard has one slot of RAM
Yes, workstations and servers have 2 slot motherboards.
A CPU is a small square chip that is secured to the motherboard.
Not possible. Every motherboard only has one CPU slot and can only hold one CPU (even though the i7's a quad-core, they're built into one piece which fits into the one slot).
The microprocessor is installed into the CPU socket on the motherboard. A CPU socket can only fit a certain range of microprocessors.
yes motherboard is a part of CPU
A 462Chipset indicates that the CPU will fit into socket 462. So if you have a motherboard with a 462 Chipset and you want to upgrade or change your CPU you have to ensure it will fit into socket 462.
IRQ
No, A Pentium 1 is a type of CPU chip. They don't make them anymore. It is a single core and would have to be used on an old motherboard with the proper pin slot.
Your motherboard may need to be changed when your CPU is upgraded.
They are basically formats for which CPU format will fit into what board. For example, any core 2 duo processor from Intel is probably an LGA 775 and will fit into LGA 775 socket motherboard. Any Core i7 processor will fit into any LGA 1366 socket motherboard. The list goes on.
No motherboard has one slot of RAM