Microprocessor
PUSH B instruction in 8085 microprocessor causes

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

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Microprocessor
In a vector interrupt

 none.
 the branch address is assigned to a fixed location in memory.
 the interrupting source supplies the branch information to the processor through an interrupt vector.
 the branch address is obtained from a register in the processor.

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