GATE | GATE CS 1999 | Question 35

A multi-user, multi-processing operating system cannot be implemented on hardware that does not support:

a) Address translation

b) DMA for disk transfer



c) At least two modes of CPU execution (privileged and non-privileged).

d) Demand Paging
(A) Only A
(B) Both A, B
(C) A, B and C
(D) A, B and D


Answer: (C)

Explanation: The correct answer would be (a) and (c) as address translation is required in the multi-programming so that no process can go into any other process’s memory. And atleast 2 modes should be present in the CPU execution so that the privileged mode could control the resource allocation of the unprivileged mode users. The DMA and Demand Paging improves the performance of the OS. Hence they are not necessary conditions in a multi-programming. But since (a) and (c) is not answers mentions in the options so the next best option will be (C) containing both (a) and (c) along with (b).
So, option (C) is correct.

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