CUET PG 2026 — operating system os PYQ

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Question

CUET PG 2026 — operating system os PYQ

CUET PG | operating system os | 2026

Assertion (A): Programmed I/O (PIO) is highly optimized for transferring very large volumes of data across fast high-speed network interfaces.

Reason (R): In Programmed I/O, the CPU must continuously poll the device status register in a busy-waiting loop, consuming valuable processor execution cycles.

Choose the correct answer:

Explanation

Analysis of Assertion (A): Programmed I/O requires the CPU to manage every single byte of data transfer, creating high overhead and CPU utilization. Therefore, stating that it is highly optimized for very large volumes of data transfer is false (mechanisms like DMA are used for large volumes).
Analysis of Reason (R): In PIO, the CPU indeed remains trapped in a busy-waiting loop polling the device status register, which wastes valuable processor cycles. This statement is true.

Correct Option: (d) Assertion (A) is false, but Reason (R) is true.