12.

13.

14.

15.

16.

17.

Which of the following instructions should be allowed in kernel and mode and not in user
mode?

@ Disable all interrupts

(11) Read the time-of-day clock

(111) Set the time-of-day clock

(iv) Change the memory map

(A) 0), 01), Gv) യ ©, 00), Gai), Gv)
(0 Gi), Gil), Gv) 6) 0) 00), Gai)

Four jobs to be executed on a single processor system arrive at time 0 in the order
൧, P,,P,and P,and their CPU burst time requirements are 5, 2, 7 and 1 ms respectively. The

completion time of P, under round robin scheduling with time quantum of 1 ms.

The command that is used to remove executable permission from the user and assign read
permission to the group and others for the file named ‘file 17

(A) chmod u-x, go + ೫ filel (B) chmod g+x, uo+rfile 1
(C) chmod g-x, go+r file 1 (D) chmod go + x, u-x file 1

Which of the following is the function of cur] command?
(^) To search a file for a particular pattern
൯) To trace the route an IP packet follows to an Internet host
(0) To transfer data using URL syntax

0) 10 list the currently running process

If the number of bits in the virtual address of a program is 8 and the page size is 16 bytes,
the number of pages in virtual address space is

(A) 8 ൪൫ 16
(C) ॐ (D) 64

Virtualization layer that enables multiple operating systems to share a single hardware host
(A) VMA (B) VMS
(C) VMR (D) VMM

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