Operating System &amp; Unix Online Test

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Operating System & Unix

Description: MCQs based on fundamentals of Operating System & Unix
Number of Questions: 25
Created by: Prabha Kade
Tags: UNIX OS Basic Fundamentals Hardware and Software Computer Basics Odd One Out Classification

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The only state transition initiated by the user process itself is

wakeup
block
dispatch
sleep

Page fault occurs when

the page is not in main memory
the page is in main memory
the page is corrupted by application software
we try to divide a number by zero

From which state will a process waiting for some I/O service in BLOCKED state start?

Running state
Ready state
Terminated state
Suspended state

Mutual exclusion problem occurs between

two disjoint processes
processes that share resources
processes that don't use the same resources
two processes in critical region

Which of the following is a real-time system?

Payroll processing
Aircraft control
Library
Automobile system

Overlay is

a part of an operating system
a single contiguous memory used for running long program by swapping
overloading the system with many user files
a single memory location

Which of the following is a single user OS?

MS DOS
UNIX
OS/2
LISP

The main function of shared memory is

to use primary memory efficiently
to do inter-process communication
to do intra-process communication
to control disk scheduling

The size of virtual memory depends on

size of address bus
size of main memory
size of data bus
none of the above

Necessary conditions for deadlock are

non-preemption and circular wait
mutual exclusion and partial allocation
both 1 and 2
none of above

Which of the following page replacement algorithms suffer(s) from Belady's Anomaly?

LRU
FIFO
Optimal replacement
Both 1 and 3

An attempt of reading a locked file is

a deadlock
premature termination
system standby
none of the above

Aging is

increasing the priority of jobs to ensure termination in finite time
keeping track of cache contents
keeping track of page references
keeping track of pages in main memory at a time

Shell command

can be used to jump from infinite looping
can be used to indicate comment
provides a communication channel
manages set of primitive functions

When a system makes system call, its mode changes from

user to kernel
kernel to user
scheduled to unrestricted
none of the above

The smallest addressable portion of a disk is called

sector
track
record
bit

Unix shell is

a GUI interface
a set of commands
a command line interpreter
a web browser

DMA stands for

Direct Memory Access
Direct Memory Accelerator
Directional Memory Access
Deemed Memory Accelerator

Semaphores are used to solve

process synchronization
race condition
parallel execution
none of the above

Dirty bit is used to show

page with corrupted data
wrong page in memory
page modified after being loaded in cache memory
page that is less frequently accessed

File pointer is

a long integer
a pointer data type
a pointer to BOF
a pointer to EOF

Which of the following calls never returns an error?

Fork
Getpid
Open
Ready

Concurrent processes are

processes that don't overlap in time
processes that overlap in time
processes that are executed by CPU at the same time
none of above

Disk scheduling decides

which disk should be accessed next
the order in which disk access requests must be served
physical location of files on disk
none of the above

Which scheduling algorithm gives minimum average waiting time?

FCFS
SJF
Round Robin
Priority

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