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8085 Instructions MCQs

Practice 8085 Instructions MCQs with four options, answers and explanations for focused Electronics & Telecommunication Engineering revision.

Question 1
Microprocessors & Microcontrollers8085 Instructions

The 8085 CALL instruction is primarily used to?

  • AInvoke a subroutine while saving the return address
  • BClear all registers
  • CDisable the clock
  • DPerform multiplication directly
Report an error
Correct Answer: A. Invoke a subroutine while saving the return address
Explanation: CALL transfers control to a subroutine and saves the return address on the stack so execution can later resume after a RET.
Reference: Standard microprocessors and microcontrollers: 8085 instructions
Question 2
Microprocessors & Microcontrollers8085 Instructions

The instruction MOV B,C in the 8085 performs what operation?

  • ACopies contents of C into B
  • BCopies B into C
  • CAdds B and C
  • DClears both B and C
Report an error
Correct Answer: A. Copies contents of C into B
Explanation: The 8085 MOV destination,source format copies the source operand into the destination, so B receives C.
Reference: Standard microprocessors and microcontrollers: 8085 instructions
Question 5
Microprocessors & Microcontrollers8085 Instructions

The 8085 JMP instruction is used for?

  • AUnconditional transfer of program control to a specified address
  • BAddition of two registers
  • CLoading immediate data into the accumulator
  • DReturning from a subroutine
Report an error
Correct Answer: A. Unconditional transfer of program control to a specified address
Explanation: JMP address loads the program counter with the specified target address without testing a condition.
Reference: Standard microprocessors and microcontrollers: 8085 instructions
Question 8
Microprocessors & Microcontrollers8085 Instructions

The 8085 instruction INX H performs which operation?

  • AIncrements HL pair by one
  • BIncrements only H by one
  • CAdds HL to accumulator
  • DLoads HL from memory
Report an error
Correct Answer: A. Increments HL pair by one
Explanation: INX operates on a 16-bit register pair, so INX H increments HL by one.
Reference: Standard microprocessors and microcontrollers: 8085 instructions