Storing and retrieving process control block

Question

When a process is in execution, the contents of the PCB (which is in kernel memory space?) are loaded onto the CPU registers, and status registers, kernel

Answer 1

It's the job of schedular to look for the processor availability, then only context switch happens. As soon as core is available the Program Counter Value of stored PCBs in kernal is taken and given to CPU registers. I would like to tell the PCBs are stored in stack fashion by the kernal.