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Essential Linux Systems Interview Questions & Answers:

1. UNIX/Linux kernel is?
a) Monolithic
b) micro
c) Exo
d) nano

a) Monolithic

2. Shared memory can be used for?
a) read only operations
b) append
c) read or read write operations
d) write only

c) read or read write operations

3. Section 2 of manpage describes:
a) Commands
b) System calls
c) Function calls
d) Drivers

b) System calls

4. The terminal used by a Daemon process is:
a) any terminal
b) no terminal
b) root terminal
d) system console

b) no terminal

5. Sysconf(_SC_PAGE_SIZE) returns?
a) size of the page
b) max size of the page
c) min size of the page
d) PAGING ALLOWED OR NOT

a) size of the page

6. ______________ timer is decremented only when the process is executing:
a) ITIMER_REAL
b) ITIMER_VIRTUAL
c) ITIMER_PROF
d) None of the above

b) ITIMER_VIRTUAL

7. Daemon process is a?
a) group leader
b) session leader
c) orphan process
d) all the above

d) all the above

8. x86 architecture uses big endian or little endian addressing mechanism?

little-endian.

9. Which of the following exec call is a system call?
a) execl
b) execlp
c) execve
d) execvp

c) execve

10. System call can be implemented using which assembly instruction(s) on x86 processors?
a) int 080
b) sysenter
c) both a & b
d) None

c) both a & b

11. Runlevel system command is used for?
a) getting the present and previous runlevel of the system
b) setting the runlevel attribute of the system in the inittab file
c) can be used to restart or reboot the system
d) all of the above

d) all of the above

12. Tell me which command is used to mount file system read only.
a) mount -a
b) mount -v
c) mount -f
d) mount -r

d) mount -r

13. Pick the run level to run Linux in multi user mode with networking?
a) 0
b) 3
c) 5
d) 6

b) 3

14. Monolithic kernel:
a) is highly extensiblity
b) has less run time overhead
c) smaller than micro level
d) Suitable for real time system

b) has less run time overhead

15. Tell me which among the following allows fast file system recovery?
a) Ext2
b) Journaling
c) Caching
d) Sysfs

b) Journaling

16. Tell me which file contains the filesystems to be automatically mounted during boot?
a) /etc/mount
b) /etc/fstab
c) /etc/inittab
d) /etc/boot

b) /etc/fstab

17. Explain ____ is a directory (which should exist), on which to mount the file system?
a) Root
b) Boot
c) Mount-point
d) Partition

c) Mount-point

18. Tell me which command is used to check filesystem usage in a system?
a) mount
b) df
c) du
d) dd

b) df

19. Tell me which filesystem can be used to change certain kernel parameters at runtime using sysctl command?
a) Ext3
b) Sysfs
c) Ext4
d) Procfs

d) Procfs

20. Which filesystem for CDROM is:
a) Ext2
b) Ext3
c) Isofs
d) Procfs

c) Isofs

21. Tell me which file system has journaling capability?
a) Ext2
b) Ext4
c) Isofs
d) Procfs

b) Ext4

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