GATE CSE 2024 Session 1 Q15: False statement about DMA, programmed I/O and interrupts

Which one of the following statements is FALSE?

Try it: multiple choice: exactly one correct option

Wrong answer costs 1/3 mark in GATE.

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Answer: C (official GATE 2024 final answer key)

Concept used: I/O transfer modes and how much CPU time each one wastes.

First step: In programmed I/O the CPU busy-waits polling the device; compare that with being interrupted only when the device is ready.

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Source: official GATE 2024 Session 1 CS question paper and final answer key, organised by IISc Bangalore. Question paper · Answer key