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): The LOOK disk scheduling algorithm spends heavy CPU processing time traveling to the absolute physical edge tracks of the hard drive platters.

Reason (R): Unlike standard SCAN, LOOK checks for pending requests ahead and immediately reverses its track traversal if no further requests exist in the current vector.

Choose the correct answer:

Explanation

Assertion (A) is False: The LOOK algorithm does not travel all the way to the absolute physical edge tracks unless a request specifically requires it; instead, it reverses direction as soon as the last request in that direction is serviced.
Reason (R) is True: Unlike standard SCAN (which always goes to the disk's physical edge), LOOK inspects pending requests ahead and immediately reverses direction once no further requests exist in the current vector.

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