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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 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 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: 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: 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 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: 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 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: Why in most USB flash drives uses FAT file system instead of NTFS.

Answer: Recently we are all using NTFS operating system. For example
WIN XP,2000 & 2003.But Windows 98 sec doesn't support NTFS,it only support FAT (File Allocation Table ).That is the reason why all the flash drives support both. Source:
Question: Which file system allow as much fragmentation FAT32 or NTFS?

Answer: ntfs Source:
Question: Is Windows NT a full blown object oriented operating system? Give reasons

Answer: No Windows NT is not so, because its not implemented in object oriented language and the data structures reside within one executive component and are not represented as objects and it does not support object oriented capabilities Source:
Question: Describe the Buddy system of memory allocation

Answer: Free memory is maintained in linked lists, each of equal sized blocks. Any such block is of size 2^k. When some memory is required by a process, the block size of next higher order is chosen, and broken into two. Note that the two such pieces differ in address only in their kth bit. Such pieces are called buddies. When any used block is freed, the OS checks to see if its buddy is also free. If so, it is rejoined, and put into the original free-block linked-list. Source:
Question: what must be stored in menory before the computer can manipulate data

Answer: Adreess of data or OPerating System Source:
Question: What is the functions of MS Terminal Server/ Metaframe XP (Citrix)to network connection?
2. What is theFrame Relay, MPLS, VoIP/QoS,IIS and WINS in Telecommunications?

Answer: frame relay is used for converting one type of frame to another type.
voice over internet protocol (voip) is used for transmission of voice.
quality of service(qos) is used to provide available resources.
Question: Difference between win xp,win 2000 professional?

Answer: There really is no structural difference, mainly topographical. They are both based off of Windows NT (New Technology). Win2000 = NT 5.0 WinXP = NT 5.1. They both use the NTFS file system providing for file encryption and compression, and enhanced security (set file permissions for individual files and folders). The real differences are visual styles, a tasks pane for user friendly ways to do common tasks, and some extra administrative options like remote desktop (terminal services in 2000), bui Source:
Question: Various input,output and secondary devices must be linked to a mircocomputer through separate

Answer: they should be linked through the i/o interface and i/o buffer..they are also connected to the dma,which prevents the intervention of microcomputer,so that i/o devices can have a direct access to the main memory 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:

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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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