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Operating Systems Interview Questions & Answers - Learning Mode

Operating Systems Interview Questions & Answers - Learning Mode

An operating system (OS) is system software that manages computer hardware and software resources and provides common services for computer programs. The operating system is a component of the system software in a computer system. Application programs usually require an operating system to function. All major computer platforms (hardware and software) require and sometimes include an operating system. Linux, Windows, VMS, OS/400, AIX, and z/OS are all examples of operating systems.

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Operating Systems Interview Questions & Answers - Learning Mode
Try Operating Systems Interview Questions & Answers - Exam Mode
Question: What is difference between NTFS & FAT32?

Answer: NTFS stands for new technology file system or network technology file system. In NTSF partition size can be of 2 TB or more. and file size can be 16 TB. file/folder encryption is done. and it supports file name character upto 255.

FAT32 stands for File allocation table. in FAT32 partition size can be Upto 2 TB. and file size can be 4 GB. file/folder encryption is not possible in FAT32. and it supports file name character upto 8.3.
Question: Advantages and disadvantages of windows and Linux os, what is the reason for using linux os than windows os.


1.The majority of Linux variants are available for free or at a much lower price than Microsoft Windows.
2.Linux is and has always been a very secure Operating System. Although it still can be attacked when compared to Windows, it much more secure.
3. The majority of Linux variants and versions are notoriously reliable and can often run for months and years without needing to be rebooted.


1.Although the majority Linux varian Source:
Question: What are system calls give examples also?

Answer: System calls are built on top of
the operating system.They are interact with kernel area of a operating system.they can also interact with the hardware part of a system like keyboard,mouse,printer,cpu etc

open()---->this is a system call which is used to open and create a file,and it returns a file descriptor.

read,seek,fork are common system call Source:
Question: What is cycle stealing?

Answer: We encounter cycle stealing in the context of Direct Memory Access (DMA). Either the DMA controller can use the data bus when the CPU does not need it, or it may force the CPU to temporarily suspend operation. The latter technique is called cycle stealing. Note that cycle stealing can be done only at specific break points in an instruction cycle. Source:
Question: What is the difference Xp and Windows 2000??

Answer: Windows XP is some what faster than Windows 2000, assuming you have a fast processor and tons of memory (although it will run fine with a 300Mhz Pentium II and 128MB of RAM).
The new Windows XP interface is more cheerful and colorful than earlier versions, although the less-cartoony "Classic" interface can still be used if desired.
Windows XP has more bells and whistles, such as the Windows Movie Maker, built-in CD writer support, the Internet Connection Firewall, and Remote Desktop Conn Source:
Question: What are the requirements for virtual memory architecture?

Answer: answer to second one
with out operating system it wud be graet difficulty bcoz

1.if we want to perform atask we should interact with hardware through machine language

2. we shud have grip over how they work wud be difficult to find errors if they occur during a execution
4. we ourselves shud manage the memory
we ourselves shud take care of device assignment to process

and many more tasks to take care by user inorder to work on computer without os

e Source:
Question: What is difference between system call and system program?

Answer: system call will cause CPU running level switch, from user level to kernel level,while system program maybe is simple library function, like sins,cons. Source:
Question: What is the difference between linux and windows operating systems?

Answer: Linux:-
It is an open source software free of cost and the source code will be available for linux os.
Microsoft Windows:-
It is a proprietary os, it doesn't contain source code. We have to pay cost for the original os. Source:
Question: What is a data register and address register?

Answer: Data registers can be assigned to a variety of functions by the programmer. They can be used with any machine instruction that performs operations on data.
Address registers contain main memory addresses of data and instructions or they contain a portion of the address that is used in the calculation of the complete addresses. Source:
Question: What is difference between Global catalog and infrastructure master?

Answer: 1. GC holds group membership of universal group. while Infrastructure hold group information in domain level.

2. We can't set infrastucture mastre and GC together on same DC.
Question: What do you mean by windows firewall in os?

Answer: firewall means in any operating system it's give the protetection then the firewall gives the protection of the os Source:
Question: I need the sample qustions @ answers of AIX operating System?

Answer: AIX is the first 64-bit UNIX that becames from the NSA in the USA the TCSEC C2 certificate, with modifications it corresponds also the TCSEC B1. AIX 4.3 can run on 64-Bit CPUs binarily 32-Bit programs and 64-Bit programs. The TCP/IP stack and the I/O system were continued to optimize on high efficiency. Up to 128 non removable disks can be combined into a logical group. OpenGL GLX 1.3 and graPHICS extensions make an increased application performance and better handling of large graphic models po Source:
Question: Which file system allow as much fragmentation FAT32 or NTFS?

Answer: ntfs Source:
Question: Why paging is used?

Answer: Paging is solution to external fragmentation problem which is to permit the logical address space of a process to be noncontiguous, thus allowing a process to be allocating physical memory wherever the latter is available. Source:
Question: What is multi-user operating system?

Answer: A multi-user Operating System allows for multiple users to use the same computer at the same time and/or different times. See our multi-user dictionary definition for a complete definition for a complete definition. Below are some examples of multi-user Operating Systems.

Windows 2000
Windows XP
Mac OS X Source:
Question: What are the basic functions of an operating system?

Answer: Operating system controls and coordinates the use of the hardware among the various applications programs for various uses. Operating system acts as resource allocator and manager. Since there are many possibly conflicting requests for resources the operating system must decide which requests are allocated resources to operating the computer system efficiently and fairly. Also operating system is control program which controls the user programs to prevent errors and improper use of the computer. Source:
Question: List out some reasons for process termination

Answer: Normal completion
Time limit exceeded
Memory unavailable
Bounds violation
Protection error
Arithmetic error
Time overrun
I/O failure
Invalid instruction
Privileged instruction
Data misuse
Operator or OS intervention
Parent termination.
Question: What is a Safe State and what is its use in deadlock avoidance?

Answer: When a process requests an available resource, system must decide if immediate allocation leaves the system in a safe state. System is in safe state if there exists a safe sequence of all processes. Deadlock Avoidance: ensure that a system will never enter an unsafe state. Source:
Question: What is a trap and trapdoor?

Answer: Trapdoor is a secret undocumented entry point into a program used to grant access without normal methods of access authentication. A trap is a software interrupt, usually the result of an error condition. Source:
Question: Explain the concept of Reentrancy.

Answer: It is a useful, memory-saving technique for multiprogrammed time sharing systems. A Reentrant Procedure is one in which multiple users can share a single copy of a program during the same period. Reentrancy has 2 key aspects: The program code cannot modify itself, and the local data for each user process must be stored separately. Thus, the permanent part is the code, and the temporary part is the pointer back to the calling program and local variables used by that program. Each execution instan Source:

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Latest 20 Questions
Payment of time- barred debt is: (a) Valid (b) Void (c) Illegal (d) Voidable
Consideration is defined in the Indian Contract Act,1872 in: (a) Section 2(f) (b) Section 2(e) (c) Section 2(g) (d) Section 2(d)
Which of the following is not an exception to the rule, "No consideration, No contract": (a) Natural love and affection (b) Compensation for involuntary services (c) Completed gift (d) Agency
Consideration must move at the desire of: (a) The promisor (b) The promisee (c) The promisor or any other party (d) Both the promisor and the promisee
An offer which is open for acceptance over a period of time is: (a) Cross Offer (b) Counter Offer (c) Standing Offer (d) Implied Offer
Specific offer can be communicated to__________ (a) All the parties of contract (b) General public in universe (c) Specific person (d) None of the above
_________ amounts to rejection of the original offer. (a) Cross offer (b) Special offer (c) Standing offer (d) Counter offer
A advertises to sell his old car by advertising in a newspaper. This offer is caleed: (a) General Offer (b) Special Offer (c) Continuing Offer (d) None of the above
In case a counter offer is made, the original offer stands: (a) Rejected (b) Accepted automatically (c) Accepted subject to certain modifications and variations (d) None of the above
In case of unenforceable contract having some technical defect, parties (a) Can sue upon it (b) Cannot sue upon it (c) Should consider it to be illegal (d) None of the above
If entire specified goods is perished before entering into contract of sale, the contract is (a) Valid (b) Void (c) Voidable (d) Cancelled
______________ contracts are also caled contracts with executed consideration. (a) Unilateral (b) Completed (c) Bilateral (d) Executory
A offers B to supply books @ Rs 100 each but B accepts the same with condition of 10% discount. This is a case of (a) Counter Offer (b) Cross Offer (c) Specific Offer (d) General Offer
_____________ is a game of chance. (a) Conditional Contract (b) Contingent Contract (c) Wagering Contract (d) Quasi Contract
There is no binding contract in case of _______ as one's offer cannot be constructed as acceptance (a) Cross Offer (b) Standing Offer (c) Counter Offer (d) Special Offer
An offer is made with an intention to have negotiation from other party. This type of offer is: (a) Invitation to offer (b) Valid offer (c) Voidable (d) None of the above
When an offer is made to the world at large, it is ____________ offer. (a) Counter (b) Special (c) General (d) None of the above
Implied contract even if not in writing or express words is perfectly _______________ if all the conditions are satisfied:- (a) Void (b) Voidable (c) Valid (d) Illegal
A specific offer can be accepted by ___________. (a) Any person (b) Any friend to offeror (c) The person to whom it is made (d) Any friend of offeree
An agreement toput a fire on a person's car is a ______: (a) Legal (b) Voidable (c) Valid (d) Illegal
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