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): Context switching overhead increases when the number of active processes running concurrently on a single CPU increases significantly.

Reason (R): The CPU spends zero time during a context switch because saving state registers is handled entirely by hardware without memory access delays.

Choose the correct answer:

Explanation

Assertion (A) is True: As the number of active processes running concurrently increases, the CPU has to switch between them more frequently. This frequent switching consumes precious CPU cycles just for saving and loading process states, leading to an increase in overall context switching overhead.
Reason (R) is False: A context switch does not take zero time. Saving and restoring state registers (Program Counter, CPU registers, etc.) involves actual CPU instructions and memory accesses (or saving to the Process Control Block), which takes a non-zero amount of time and introduces overhead.
Correct Answer: C. A is true but R is false.