Microprocessor
Program counter in a digital computer

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

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Microprocessor
Which one of the following is not correct?

 An instruction is a set of bits that defines a computer operation
 Bootstrap is a technique or device for loading first instruction
 Bus is a group of wires
 An interrupt signal is required at the start of every program

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Microprocessor
PUSH B instruction in 8085 microprocessor causes

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

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