Flags and Status Registers MCQs

By: Prof. Dr. Fazal Rehman | Last updated: June 19, 2025

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1. : What is the primary purpose of the status register in a microprocessor?





2. : Which flag is set when the result of an arithmetic operation is zero?





3. : The Carry Flag (CF) is set when a(n) ______ occurs during an arithmetic operation.





4. : What is the function of the Parity Flag (PF)?





5. : Which flag is used to indicate whether a subtraction resulted in a borrow?





6. : What does the Overflow Flag (OF) indicate?





7. : When the result of an operation is negative, which flag is set?





8. : The Auxiliary Carry Flag (AF) is mainly used for which type of arithmetic operation?





9. : The Zero Flag (ZF) is cleared when the result of an arithmetic operation is:





10. : What is the size of the flags register in most x86 processors?





11. : Which of the following flags is NOT a part of the condition code register (CCR)?





12. : In a microcontroller, which flag is commonly set when a subtraction results in a borrow?





13. : The Sign Flag is set if the result of an operation is:





14. : In which scenario is the Carry Flag set to 1?





15. : The purpose of the Direction Flag (DF) in x86 processors is to:





16. : What does the Interrupt Flag (IF) control in a processor?





17. : Which flag is cleared to prevent interrupts in a microprocessor?





18. : The Overflow Flag (OF) is set during which of the following conditions?





19. : When a processor encounters an even number of 1’s in a result, the Parity Flag is:





20. : What does the Auxiliary Carry Flag (AF) indicate?





21. : Which flag is used to detect errors in transmission systems?





22. : The Direction Flag (DF) is cleared to make string operations process:





23. : Which register contains flags like Zero, Carry, and Overflow in most processors?





24. : When the result of an addition overflows a signed integer’s range, which flag is set?





25. : Which flag can indicate that no more instructions should be executed in a pipeline?





26. : In a microprocessor, which flag is checked to determine if a loop operation should continue?





27. : When the result of an arithmetic operation is even, which flag will be set?





28. : Which of the following flags will be cleared if the result of an operation is positive?





29. : The Zero Flag is primarily used to:





30. : Which flag is used to signal when an arithmetic result is too large for the destination operand?





31. : The Direction Flag (DF) is typically used in which type of instruction?





32. : Which flag is often checked before branching in conditional jump instructions?





33. : In x86 architecture, which flag is set if the result is less than zero in a subtraction operation?





34. : What is the main function of the Status Register in most CPUs?





35. : Which of the following flags is used in decimal arithmetic operations?





36. : The Carry Flag (CF) is typically checked in which of the following operations?





37. : When the Zero Flag (ZF) is set, it usually indicates:





38. : What happens to the Overflow Flag if an addition operation exceeds the signed integer limit?





39. : The Parity Flag is used to check:





40. : Which flag indicates that a string operation will proceed from lower to higher memory addresses?





41. : When a microprocessor executes a logical AND operation, which flag is NOT affected?





42. : Which flag is typically affected by an arithmetic right shift operation?





43. : In an x86 processor, the condition of which flag is used to control the IN/OUT instructions?





44. : Which flag can help identify if the system has encountered an integer overflow error?





45. : In a string comparison, which flag is crucial in determining if the strings are equal?





46. : What does it mean when the Carry Flag is set to 1 after a subtraction?





47. : The Auxiliary Carry Flag is set during operations that involve:





48. : The direction of string operations in assembly language is controlled by the:





49. : Which flag is used in signed number arithmetic to indicate a change in sign?





50. : If the result of a computation is zero, which flag will be set to 1?





 

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