NSCT – Output Systems MCQs 20 min Score: 0 Attempted: 0/20 Subscribe 1. . The main purpose of an I/O system is: (A) Manage CPU scheduling (B) Enable communication between CPU and I/O devices (C) Manage memory (D) Store files permanentlyShow All Answers 2. . A device controller is: (A) Hardware that controls an I/O device (B) Part of CPU (C) File system module (D) Memory unit 3. . Programmed I/O requires: (A) DMA for transfer (B) CPU to continue other tasks (C) CPU to wait until I/O is complete (D) Interrupts for signaling 4. . Interrupt-driven I/O allows: (A) CPU to execute other instructions while waiting (B) CPU to wait idle (C) Only sequential access (D) DMA transfer only 5. . Direct Memory Access (DMA) is used to: (A) Increase CPU speed (B) Transfer data without CPU intervention (C) Store files (D) Manage memory 6. . Spooling is used to: (A) Increase CPU speed (B) Allocate registers (C) Manage RAM (D) Store output of one device to use later by another device 7. . Which I/O technique is fastest for large data transfers? (A) Programmed I/O (B) DMA (C) Interrupt-driven I/O (D) Sequential I/O 8. . A device driver is: (A) Hardware component (B) Memory manager (C) CPU scheduler (D) Software that controls a specific device 9. . Block devices transfer data in: (A) Single characters (B) CPU instructions (C) Files only (D) Fixed-size blocks 10. . Character devices transfer data: (A) One character at a time (B) In blocks (C) Using DMA only (D) Using files only 11. . Synchronous I/O requires: (A) Only interrupts (B) DMA for transfer (C) CPU waits until I/O operation completes (D) Memory management 12. . Asynchronous I/O allows: (A) CPU to wait idle (B) CPU to continue execution while I/O is in progress (C) Files to be deleted (D) Sequential access only 13. . Memory-mapped I/O means: (A) CPU waits idle (B) I/O device is mapped to memory address space (C) Files are stored in memory (D) DMA only 14. . Polling is a method where: (A) DMA transfers data automatically (B) CPU waits for interrupt (C) CPU repeatedly checks device status (D) Files are stored sequentially 15. . Which of the following is an advantage of interrupt-driven I/O over programmed I/O? (A) Simpler implementation (B) CPU utilization is higher (C) CPU always waits idle (D) Less control over devices 16. . I/O buffers are used to: (A) Store files permanently (B) Increase CPU registers (C) Temporarily hold data between CPU and device (D) Schedule CPU 17. . Double buffering improves: (A) CPU speed only (B) Device utilization and system performance (C) Memory capacity (D) File storage 18. . Direct I/O means: (A) CPU reads/writes directly to/from I/O device (B) Data is transferred via buffer (C) CPU uses DMA (D) CPU waits idle 19. . Channel I/O is used in: (A) Large mainframe systems (B) Personal computers (C) Laptops only (D) Microcontrollers 20. . The main goal of I/O systems is to: (A) Increase CPU speed only (B) Ensure efficient and reliable communication between CPU and devices (C) Manage memory (D) Delete files automatically
