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Frequently Asked Operating System interview questions and answers for freshers

(#M40029507) OPERATING SYSTEM QUESTION operating system Keep an EYE

Q. What are links and symbolic links in UNIX file system?

A. A link is a second name (not a file) for a file. Links can be used to assign more than one name to a file, but cannot be used to assign a directory more than one name or link filenames on different computers.
Symbolic link 'is' a file that only contains the name of another file.Operation on the symbolic link is directed to the file pointed by the it.Both the limitations of links are eliminated in symbolic links.
Commands for linking files are:
Link ln filename1 filename2
Symbolic link ln -s filename1 filename2

Asked In Operating System MAN (8 years ago)

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(#M40029499) OPERATING SYSTEM QUESTION operating system Keep an EYE

What are the reasons for process suspension?
1) swapping
2) interactive user request
3) timing
4) parent process request

Asked In Operating System MAN (8 years ago)

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(#M40167108) OPERATING SYSTEM QUESTION Application Software question Keep an EYE

Which of the given options is NOT an application software?

A. DOS
B. Microsoft Word
C. VLC media player
D. MySQL

Asked In Operating System Jax (9 Months ago)

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(#M40029496) OPERATING SYSTEM QUESTION operating system Keep an EYE

Q. What is Dispatcher?

A. Dispatcher module gives control of the CPU to the process selected by the short-term scheduler; this involves: Switching context, Switching to user mode, Jumping to the proper location in the user program to restart that program, dispatch latency - time it takes for the dispatcher to stop one process and start another running.

Asked In Operating System MAN (8 years ago)

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(#M40029485) OPERATING SYSTEM QUESTION operating system Keep an EYE

Q. What is a device queue?

A. A list of processes waiting for a particular I/O device is called device queue.

Asked In Operating System MAN (8 years ago)

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(#M40029458) OPERATING SYSTEM QUESTION operating system Keep an EYE

Q. What is thrashing?

A. It is a phenomenon in virtual memory schemes when the processor spends most of its time swapping pages, rather than executing instructions. This is due to an inordinate number of page faults

Asked In Operating System MAN (8 years ago)

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(#M40029456) OPERATING SYSTEM QUESTION operating system Keep an EYE

Q. What is process synchronization?

A. A situation, where several processes access and manipulate the same data concurrently and the outcome of the execution depends on the particular order in which the access takes place, is called race condition. To guard against the race condition we need to ensure that only one process at a time can be manipulating the same data. The technique we use for this is called process synchronization.

Asked In Operating System MAN (8 years ago)

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(#M40018998) OPERATING SYSTEM QUESTION Operating System Questions Keep an EYE

Which is the best page replacement algorithm and Why? How much time is spent usually in
each phases and why?

Asked In Operating System (9 years ago)

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(#M40152806) OPERATING SYSTEM QUESTION Keep an EYE

No. of pages are given and using LRU algorithm we have to find the number of page faults.
a) 2 b) 6 c) 5 d)7

Asked In Operating System Nakshatra Mukhopadhyay (6 years ago)

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(#M40029488) OPERATING SYSTEM QUESTION operating system Keep an EYE

Q. What are the disadvantages of context switching?

A. Time taken for switching from one process to other is pure over head. Because the system does no
useful work while switching. So one of the solutions is to go for threading when ever possible.

Asked In Operating System MAN (8 years ago)

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