Linux MCQ: Linux Multiple Choice Questions and Answers

Linux MCQ with answers and explanations for placement tests and job interviews. These solved Linux MCQs are useful for the campus placement for all freshers including Engineering Students, MCA students, Computer and IT Engineers, etc.

Our Linux MCQ (Linux multiple Choice Questions ) focuses on various Linux commands and their command-line options & parameters. It will be useful for anyone learning Linux Basics, Essentials, and/or Fundamentals. We will regularly update the quiz and most interesting thing is that questions come in a random sequence. So every time you will feel new questions.

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Guideline of Linux MCQ:

This Linux MCQ is intended for checking your Linux knowledge. It takes 1 hour to pass the Linux MCQ. If you don’t finish the Linux MCQ within the mentioned time, all the unanswered questions will count as wrong. You can miss the questions by clicking the “Next” button and return to the previous questions by the “Previous” button. Every unanswered question will count as wrong. MCQ on Linux has features of randomization which feel you a new question set at every attempt.

In this Linux Quiz, we have also implemented a feature that not allowed the user to see the next question or finish the quiz without attempting the current Linux MCQ.

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Linux MCQ

Linux MCQ: Linux Multiple Choice Questions and Answers

1 / 60

What does the /etc/nsswitch.conf file manage?

priority of one DNS server over another

per network interface DNS server configuration

alternative DNS services

sources for name service information

2 / 60

You are managing an Apache web server on a system using SELinux. By default, it cannot read personal webpages in users' home directories. What SELinux boolean would you set to allow this?

apache_enable_homedirs

httpd_enable_userdirs

httpd_enable_homedirs

httpd_enable_userhome_dirs

3 / 60

What is the /etc/hosts file used for?

resolving the local name

blocking sites using iptables

setting the hostname

configuring DNS name servers

4 / 60

How could one search for the file foo.txt under the directory /home?

Search /home -file foo.txt

Search /home foo.txt

Find /home -file foo.txt

Find /home -name foo.txt

Find /home foo.txt

5 / 60

When would this system cron job run its task?

0 1 * * *

every minute of the hour

every hour of every day

every day at 1:00 AM

only on Mondays

6 / 60

A backup drive was created using dd to make a bit-for-bit copy. When the drive is inserted into an iSCSI target before it is booted up, the data appears to be missing. What happened?

The backup drive is corrupted and needs to be re-created.

When the backup drive was duplicated, the label was as well. When booted, the system mounted the old duplicated drive by its identical label.

There is a conflict between the physical location of the backup drive and the original drive.

The backup process went wrong, and the old drive was duplicated over the original drive.

7 / 60

Linux file access control lists (ACLs) are _.

discretionary access control system permissions layered over standard Linux permissions

mandatory access control system permissions layered over standard Linux permissions

a type of firewall for Linux

the same as standard Linux permissions

8 / 60

How can the current directory and its subdirectories be searched for the file name MyFile.xml?

Find -name MyFile.xml

Grep MyFile.xml | find

Grep -r MyFile.xml

Less MyFile.xml

Search MyFile.xml ./

9 / 60

What is not inherited by the child process?

shell aliases

userid

environmental variables

scheduling priority

10 / 60

In a systemd-based OS, you can change the system hostname by editing /etc/hostname manually and then doing what?

Restart dhcpd.

Run /etc/hostname.

Nothing, the system notices automatically.

Notify systemd to update it by restarting the systemd-hostnamed service.

11 / 60

Which command is used to make a shell variable known to subsequently executed programs?

Export

Announce

Env

Transfer

12 / 60

What is the preferred source for the installation of new applications?

The vendor's version management system

A CD-ROM disk

The distribution's package repository

The vendor's website

A retail store

13 / 60

Why doesn't passwd -l keep a user from logging in via other methods?

The passwd command is not used for locking passwords.

There is no password -l option.

It locks only the password, not the account, so users can still authenticate with keys or other methods.

It does lock the account, keeping users from logging in even if they are using other authentication methods.

14 / 60

Packages can be downloaded but not installed with yum or dnf by specifying which option?

None of these answers. yum does not support downloading packages without installing them.

--downloaddir

-d

--downloadonly

15 / 60

To configure the Kerberos client, which command should you use to import the keytab file?

krb5-workstation

ktutil

pam_krb5

kdb5_util

16 / 60

Which command allows you to do packet analysis from the command line?

wireshark

ethtool

netstat

tcpdump

17 / 60

When using iproute2, how do you show routing information for an IPv6 network?

route -ipv6

route

ip -6 route show

ip route show

18 / 60

Which of the following commands can be used to extract files from an archive?

Tar -vf

Tar -xvf

Tar -evf

Tar -e

Tar -v

19 / 60

ifconfig has been deprecated. What command is now recommended for changing IP addresses in the live config?

netconf

ipconfig

ipman

20 / 60

In an extended regular expression, you would use (pattern){3} to match three instances of the pattern. How would you match the same thing with an extended glob?

3(pattern)

{0,3}(pattern}

Occurrence quantifiers are not supported in Bash's version of extended globs, so this is not possible.

{3}(pattern})

21 / 60

What is a major advantage of using Logical Volume Management (LVM)?

Access to a drive is faster than with standard partitions.

Volumes can be resized smaller without unmounting them.

Repairing filesystem errors is easier than with standard partitions.

Volumes can be resized even if the free space is not contiguous.

22 / 60

To mount a drive-by its ID, what command would you use first to retrieve it?

df -h

listid

ls -l

blkid

23 / 60

What is the job of the NetworkManager daemon?

It is a graphical tool that manages network connections, including bonding and wireless networks.

It is a security service that manages user access control of local network-aware services.

It attempts to keep an active network connection available at all times.

It is a command-line tool that manages network connections.

24 / 60

To search from the current cursor position up to the beginning of the file using VIM, type __ and then the search criteria.

/search

25 / 60

Which command will tell you how long a system has been running?

log

uptime

runtime

access

26 / 60

How would you describe PCP (Performance Co-Pilot)?

It is an application testing suite used to profile programming code.

It is a local command used for monitoring local system resources in real time.

It is a set of tools, services, and libraries for gathering and analyzing performance measures.

It is a tool designed to change system configuration for purposes of optimization.

27 / 60

When configuring a Samba share, how would the engineering group be specified in the smb.conf?

Samba uses Linux operating system groups from the /etc/group file; just specify the group name.

It would be preceded by a percent sign (%), such as %engineers.

Use the group name by itself; Samba checks for its existence.

It would be preceded by an @ symbol, such as @engineering.

28 / 60

What does this command string do?

find / -size +10M -exec ls -l {} ;

It finds all files using ls -l and hands them off to the find command to display.

It finds all files older than 10 minutes and long lists them using the ls command

It finds all files larger than 10 MB and long lists them using the ls command.

It uses the ls command to find all files in the filesystem matching the {} wildcard.

29 / 60

What is the key difference between a redirect (>) and piping to the tee command?

The tee command sends output only to STDOUT and STDERR.

A redirect sends output to STDOUT and a file, whereas a tee sends output only to STDOUT.

Nothing, they are the same.

The tee command sends output to STDOUT and a file, whereas a redirect sends output only to a file.

30 / 60

Which of the following will change the group that is associated with a file?

Chmod

Chmod -w

Chown

Ls -g

31 / 60

When archiving files, which command will preserve all file attributes including ACLs and SELinux security context?

zip

tar

What character class is equal to this set?

[0-9]

[[:alnum:]]

[[:digit:]]

[[:alpha:]]

[[:num:]]

35 / 60

Which command would you use to get comprehensive documentation about any command in Linux?

Help command

Echo command

Locate command

Man command

Get command

36 / 60

Why is the passwd command able to modify the /etc/passwd file?

The kernel identifies it as one of the names of extended commands.

It has the same name as the file it modifies.

It has the SUID permission mode and is owned by root.

It is a system administration command.

37 / 60

Which of the following is a combined audio/video interface for the transmission of digital data?

ATI

DVD

HDMI

VGA

DVI

38 / 60

What command is used to determine the amount of disk usage for a directory?

find

fdisk

39 / 60

When a user deletes a file using the rm command, Linux will _.

always ask for confirmation

back up the file before it deletes the file

ask for confirmation if configured to do so

never ask for confirmation

40 / 60

You want to resolve a long list of DNS names using dig. What should you do?

Create a text file including all names and use the -f option of dig.

Type in each query manually.

Write a shell script to send multiple dig queries to the DNS server.

Save the DNS names in an SQL database and process it with dig.

41 / 60

Which is a suitable command to find the next appearance of the word hidden in a man page being viewed from the command line?

Find hidden

/? hidden

CTRL-F hidden

/hidden

42 / 60

Which command will display the last line of the file foo.txt?

Head -n foo.txt

Tail foo.txt

Last -n 1 foo.txt

Tail -n 1 foo.txt

43 / 60

Which command in Bash executes the last line in the shell history that starts with ls?

!ls

44 / 60

To remove all ACLs from a directory, use setfacl with which options?

-d

-k

-b

-x

45 / 60

Which of the following commands can be used to create a file?

Touch

Build

Nico

Create

Mkfile

46 / 60

You send an email to a remote client using the following syntax. What will be in the body of the email?

date | mail -s "This is a remote test" user1@rhhost1.localnet.com

"This is a remote test"

the date, the time, and the words "This is a remote test"

The email subject shows "This is a remote test" but the body of the email will be empty.

the current date and time

47 / 60

Assume the variable myNumber holds a string consisting of 10 digits. What will this command output?

echo \$myNumber | sed -e 's/^[[:digit:]][[:digit:]][[:digit:]]/(&)/g'

It will only match digits—and since the string has only digits, the command will output the same number without changes.

It will output the same 10-digit number, but every digit will be inside parentheses.

It will output the entire 10-digit number inside parentheses.

It will output the same 10-digit number, but the first 3 digits will be inside parentheses.

48 / 60

Why might would you use the usermod command ?

to log out a user

to lock a user's account

to change global user account settings

to set a user's password

49 / 60

What NFS option allows the root user to access NFS shares as the root user?

no_admin_squash

no_root_squash

allow_root_access

all_squash

50 / 60

What would this command output?

ps -e --format uid,pid,ppid,%cpu,cmd

the user ID, process ID, parent process ID, CPU usage, and command name of a process

the user ID, group ID, parent process ID, CPU usage, and command name of a process

the UUID, process ID, parent process ID, CPU usage, and command name of a process

All of the above.

51 / 60

What are the three sets of permission for a file?

Administrator, group, others

User, group, others

User, standard user, others

Administrator, standard user, others

52 / 60

Which option will cause the echo command NOT to output a trailing newline?

-e

-p

-n

-s

53 / 60

Which command displays the list of groups to which a user belongs?

Whoami

Isgroup

Who

54 / 60

In the Bash shell, what is the difference between piping into | and piping into |&?

Piping into | pipes both stdout and stderr. Piping into |& pipes only stderr.

Piping into | pipes stdout. Piping into |& pipes stdout and stderr.

Piping into | pipes both stdout and stderr. Piping into |& pipes only stdout.

Piping into | pipes stdout. Piping into |& pipes all open file descriptors.

55 / 60

Which of the following can be used to access the command line?

BIOS

Terminal

XWindow

Firefox

Xargs

56 / 60

Which network interface always exists in a Linux system?

Sit0

Wlan0

Vlan0

Eth0

57 / 60

What command would you use to resize an LVM volume group to include an additional physical volume?

vgadd

vgresize

vgappend

vgextend

58 / 60

Which of the following directories is often used to store log files?

/home

/var

/temp

/dev

/usr

59 / 60

What would this locate command show?

locate --regexp '^/usr.*pixmaps.*jpg$'

all files in a directory named pixmaps

all files ending in ".jpg"

all file paths that start with "/usr", include the word "pixmaps", and end with ".jpg"

all file paths that include "/usr/pixmaps" and end with ".jpg"

60 / 60

Which of the following commands can be used to determine the time of the last login of a given user?

Showlog

Recent

Last

History

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Linux MCQ: Linux Multiple Choice Questions and Answers

Guideline of Linux MCQ:

You have 1 hours to take the Linux MCQs

Your time has been Over.

What character class is equal to this set?

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