Microprocessor
PUSH B instruction in 8085 microprocessor causes

 the contents of register B only to be copied in the stack
 the contents of register B & C to be copied in the stack
 the contents of registers B & C to be transferred in the stack and and the registers get cleared
 registers B & C to be cleared

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Microprocessor
Program counter in a digital computer

 Counts the numbers of programs run in the machine.
 Points the memory address of the next instruction to be fetched.
 Counts the number of times a subroutine is called.
 Counts the number of times the loops are executed.

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