BARC CS 2018 Nuclear Quiz -1 (OS)

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Question 1

There are six processes waiting ready queue with the brust time are 9, 7, 4, 2, 1 and x, In what order should they run to minimize the average waiting time when the value of x is either 5 or 6.

• A1, 2, 4, x, 7, 9
• B9, 7, x, 4, 2, 1
• Cx, 7, 9, 4, 2, 1
• DOrder can not decided

Question 2

Which of the following cases are not possible?
(i) Deadlock involving one process
(ii) Deadlock involving one resource
(iii) Deadlock between two threads in a process

• Ai only
• Bi and ii
• Ci and iii
• Di, ii and iii

Question 3

Choose the correct option:
The correct sequence for file system layout is:

• ABoot block, super block, inode list, data blocks.
• BSuper block, boot block, inode list, data blocks.
• CData block, super block, boot block, inode list.
• DBoot block, super block, data block, inode list.

Question 4

Consider the following page reference string: 1, 2, 3, 4, 2, 1, 5, 6, 2, 1, 2, 3, 7, 6, 3, 2, 1, 2, 3, 6. How many page faults would occur for the optimal page replacement algorithm with 6 available free frames in physical memory?

• A6
• B5
• C8
• D7

Question 5

Consider the following program and choose the correct precedence graph for it

• A
• B
• C
• DNone.

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