Take This CompTIA A+ Essentials Quiz On IRQ Assignments!

14 Questions | Total Attempts: 1828

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A Plus Essential Quizzes & Trivia

This CompTIA A+ Essentials quiz has been made to see whether you are completely prepared for the real exam. This practice test will help you pass by familiarizing you with the material and the ensuring that you know the structure. This quiz has been made to test your knowledge about the IRQ(Interrupt Request Line) assignments in modern PCs. Read the questions carefully and answer. So, let's try out this quiz. Good Luck!


Questions and Answers
  • 1. 
    Which IRQ is assigned to the system timer?
    • A. 

      IRQ 1

    • B. 

      IRQ 7

    • C. 

      IRQ 8

    • D. 

      IRQ 0

  • 2. 
    What IRQ is used by the keyboard?
    • A. 

      IRQ 2

    • B. 

      IRQ 3

    • C. 

      IRQ 1

    • D. 

      IRQ 6

  • 3. 
    Which IRQ is used to "cascade" higher-numbered interrupt requests to the higher-priority IRQ 2?
    • A. 

      IRQ 9

    • B. 

      IRQ 8

    • C. 

      IRQ 10

    • D. 

      IRQ 7

  • 4. 
    Which IRQ is assigned to COM2/COM4?
    • A. 

      IRQ 4

    • B. 

      IRQ 3

    • C. 

      IRQ 5

    • D. 

      IRQ 1

  • 5. 
    IRQ 4 is used by what device?
    • A. 

      COM2/COM4

    • B. 

      COM1/COM3

    • C. 

      LPT1

    • D. 

      No specific device is assigned; this IRQ handles cascaded signals from IRQs 8-15.

  • 6. 
    IRQ 5 is used by what device?
    • A. 

      COM1/COM3

    • B. 

      Primary IDE controller

    • C. 

      LPT1

    • D. 

      LPT2

  • 7. 
    Which IRQ is assigned to the floppy disk controller?
    • A. 

      IRQ 8

    • B. 

      IRQ 6

    • C. 

      IRQ 4

    • D. 

      IRQ 2

  • 8. 
    Choose which IRQs are assigned to printer (LPT) ports:
    • A. 

      IRQ 1

    • B. 

      IRQ4

    • C. 

      IRQ 7

    • D. 

      IRQ 6

    • E. 

      IRQ 5

  • 9. 
    IRQ 8 is used by what device?
    • A. 

      Real-time clock

    • B. 

      Secondary IDE controller

    • C. 

      Primary IDE controller

    • D. 

      System timer

  • 10. 
    Which IRQs are system-reserved and cannot be reassigned?
    • A. 

      IRQ 2

    • B. 

      IRQ 9

    • C. 

      IRQ 0

    • D. 

      IRQ 1

    • E. 

      IRQ 8

  • 11. 
    Which IRQs are typically free, by default, assuming all other default assignments are taken?
    • A. 

      IRQ 12

    • B. 

      IRQ 11

    • C. 

      IRQ 10

    • D. 

      IRQ 13

    • E. 

      IRQ 9

  • 12. 
    Which device is typically assigned to IRQ 12?
    • A. 

      None; it is free, by default

    • B. 

      PS/2 mouse

    • C. 

      Primary IDE controller

    • D. 

      Keyboard

  • 13. 
    Which device uses IRQ 13?
    • A. 

      Video interrupt handler

    • B. 

      Keyboard

    • C. 

      Math coprocessor

    • D. 

      Primary IDE controller

  • 14. 
    Which IRQ is assigned to the secondary IDE controller?
    • A. 

      IRQ 17

    • B. 

      IRQ 16

    • C. 

      IRQ 15

    • D. 

      IRQ 14