Operating System MCQ (Multiple Choice Questions), Operating System Online Quiz

1 .

Which of the following is not an operating system?

A)

MAC

B)

Linux

C)

Oracle

D)

Windows

Correct Answer : Oracle

Explanation : Oracle is an RDBMS (Relational Database Management System). It is known as Oracle Database, Oracle DB, or Oracle Only. The first database for enterprise grid computing is the Oracle database.

2 .

Operating systems is __________

A)

Links the program with subroutines

B)

Helps to create a flow chart of the programs

C)

Provides a layer so as to act as a user-friendly interface that enables the programmer to draw a flow chart

D)

All of the above

Correct Answer : Provides a layer so as to act as a user-friendly interface that enables the programmer to draw a flow chart

Explanation : OS acts as an interface between the user.

3 .

What is an operating system?

A)

system service provider to the application programs

B)

collection of programs that manages hardware resources

C)

interface between the hardware and application programs

D)

All of the above

Correct Answer : All of the above

Explanation : An Operating System acts as an intermediary between user/user applications/application programs and hardware. It is a program that manages hardware resources. It provides services to application programs.

4 .

What is the main function of the command interpreter?

A)

to get and execute the next user-specified command

B)

to handle the files in the operating system

C)

to provide the interface between the API and application program

D)

None of the above

Correct Answer : to get and execute the next user-specified command

Explanation : The main function of a command interpreter is to get and execute the next user-specified command. Command Interpreter checks for valid command and then runs that command else it will throw an error.

5 .

What is the maximum length of the filename in DOS?

A)

12

B)

8

C)

5

D)

4

Correct Answer : 8

Explanation : The maximum length of the filename is 8 characters in the DOS operating system. It is commonly known as an 8.3 filename.

6 .

When was the first operating system developed?

A)

1949

B)

1950

C)

1951

D)

1952

Correct Answer : 1950

Explanation : The first operating system was developed in the early 1950's. It was also called a single-stream batch processing system because it presented data in groups.

7 .

When were MS windows operating systems proposed?

A)

1970

B)

1975

C)

1980

D)

1985

Correct Answer : 1985

Explanation : The first MS Windows operating system was introduced in early 1985.

8 .

In Operating Systems, which of the following is/are CPU scheduling algorithms?

A)

Priority

B)

Round Robin

C)

Shortest Job First

D)

All of the above

Correct Answer : All of the above

Explanation :

In Operating Systems, CPU scheduling algorithms are :

i) First Come First Served scheduling

ii) Shortest Job First scheduling

iii) Priority scheduling

iv) Round Robin scheduling

v) Multilevel Queue scheduling

vi) Multilevel Feedback Queue scheduling

All of these scheduling algorithms have their own advantages and disadvantages.

9 .

Which of the following is the extension of Notepad?

A)

.xls

B)

.bmp

C)

.txt

D)

.ppt

Correct Answer : .txt

Explanation : The .txt file extension is a standard text document extension that contains the unformatted text. It is the default file extension for the notepad.

10 .

The part of machine level instruction, which tells the central processor what has to be done, is_______

A)

Address

B)

Operation code

C)

Locator

D)

Flip-Flop

Correct Answer : Operation code

11 .

Which of the following refers to the associative memory?

A)

there is no need for an address i.e. the data is used as an address

B)

the data are accessed sequentially

C)

the address of the data is generated by the CPU

D)

the address of the data is supplied by the users

Correct Answer : there is no need for an address i.e. the data is used as an address

12 .

To avoid the race condition, the number of processes that may be simultaneously inside their critical section is______

A)

0

B)

1

C)

8

D)

16

Correct Answer : 1

13 .

An operating system is ____ which performs the entire basic task like file management, process management, etc.

A)

Thread

B)

Process

C)

Program

D)

Software

Correct Answer : Software

Explanation : An operating system is a software that performs all the basic tasks like file management, process management, etc.

14 .

How many types of the operating system are there?

A)

3

B)

5

C)

7

D)

8

Correct Answer : 7

Explanation : Mainly there are 7 types of operating systems: Batch OS, Multitasking OS, Multiprocessing OS, Real-time OS, Distributed OS, Network OS, and mobile OS.

15 .

What else is a command interpreter called?

A)

shell

B)

kernel

C)

prompt

D)

command

Correct Answer : shell

Explanation : The command interpreter is also called the shell.

16 .

What is the full name of FAT?

A)

File attribute table

B)

Font attribute table

C)

File allocation table

D)

Format allocation table

Correct Answer : File allocation table

Explanation : The FAT stands for File allocation table. The FAT is a file system architecture. It is used in computer systems and memory cards. A FAT of the contents of a computer disk indicates which field is used for which file.

17 .

BIOS is used?

A)

By compiler

B)

By operating system

C)

By interpreter

D)

By application software

Correct Answer : By operating system

Explanation : BIOS is used by the operating system. It is used to configure and identify the hardware in a system such as the hard drive, floppy drive, optical drive, CPU, and memory.

18 .

Which of the following is the feature of the operating system?

A)

Error detection aids

B)

Control over system performance

C)

Coordination between other software and users

D)

All of the above

Correct Answer : All of the above

Explanation : Error detection aids, Control over system performance, Job accounting, Coordination between other software and users, Process management, Memory management, etc are some of the common features of the operating system.

19 .

Which of the following operating system does not interact with the computer directly, in fact in this operating system each user prepares his job in an offline device and submits it to the computer?

A)

Batch Operating system

B)

Distributed Operating System

C)

Multitasking Operating System

D)

Time-sharing Operating System

Correct Answer : Batch Operating system

Explanation : Batch Operating system does not interact with the computer directly, in fact in this operating system each user prepares his job in an offline device like a punch card and submits it to the computer.

20 .

_______ Operating system is a technique that enables many people, located at various terminals, to use a particular computer system at the same time?

A)

Batch Operating system

B)

Time-sharing Operating System

C)

Distributed Operating System

D)

Multitasking Operating System

Correct Answer : Time-sharing Operating System

Explanation : Time-sharing Operating System is a technique that enables many people, located at various terminals, to use a particular computer system at the same time; it is shared among different users.

21 .

A system program that combines the separately compiled modules of a program into a form suitable for execution

A)

assembler

B)

load and go

C)

linking loader

D)

cross compiler

Correct Answer : linking loader

22 .

Process is ______

A)

a program in execution

B)

a job in secondary memory

C)

contents of main memory

D)

program in High level language kept on disk

Correct Answer : a program in execution

23 .

Addressing structure_____

A)

performs indicated operations on two fast registers of the machine and leave the result in one of the registers.

B)

are variations in the use of fundamental addressing structures, or some associated actions which are related to addressing.

C)

defines the fundamental method of determining effective operand addresses

D)

All of the above

Correct Answer : defines the fundamental method of determining effective operand addresses

24 .

What is the mean of the Booting in the operating system?

A)

To scan

B)

To turn off

C)

Install the program

D)

Restarting computer

Correct Answer : Restarting computer

Explanation : Booting is a process of the restart the computer. After restarting it, there is no software in the computer's main memory.

25 .

When does page fault occur?

A)

The deadlock occurs.

B)

The buffering occurs.

C)

The page is present in memory.

D)

The page does not present in memory.

Correct Answer : The page does not present in memory.

Explanation : Page faults occur when a process tries to access a block page of the memory and that page is not stored in RAM (Read only memory) or memory.

26 .

To access the services of the operating system, the interface is provided by the ___________

A)

API

B)

System calls

C)

Library

D)

Assembly instructions

Correct Answer : System calls

Explanation : To access services of the Operating System an interface is provided by the System Calls. Generally, these are functions written in C and C++. Open, Close, Read, Write are some of most prominently used system calls.

27 .

CPU scheduling is the basis of ___________

A)

multiprogramming operating systems

B)

multiprocessor systems

C)

larger memory sized systems

D)

None of the above

Correct Answer : multiprogramming operating systems

28 .

Which one of the following errors will be handle by the operating system?

A)

power failure

B)

lack of paper in printer

C)

connection failure in the network

D)

All of the above

Correct Answer : All of the above

Explanation : All the mentioned errors are handled by OS. The OS is continuously monitoring all of its resources. Also, the OS is constantly detecting and correcting errors.

29 .

Banker's algorithm is used?

A)

To solve the deadlock

B)

To deadlock recovery

C)

To prevent deadlock

D)

None of the above

Correct Answer : To prevent deadlock

Explanation : Banker's algorithm is used to prevent the deadlock condition. The banker algorithm is sometimes called the detection algorithm. It is named the banker algorithm because it is used to determine whether a loan can be granted in the banking system or not.

30 .

When you delete a file in your computer, where does it go?

A)

Taskbar

B)

Hard disk

C)

Recycle bin

D)

None of the above

Correct Answer : Recycle bin

Explanation : When you delete a file on your computer device, it is transferred to your computer system's recycle bin or trash.

31 .

Which of the type of OS reads and reacts in terms of actual time?

A)

Batch OS

B)

Real time OS

C)

Time Sharing OS

D)

Quick sharing OS

Correct Answer : Real time OS

32 .

A systematic procedure for moving the CPU to new process is known as______

A)

Context Switching

B)

Deadlock

C)

Starvation

D)

Synchronization

Correct Answer : Context Switching

Explanation : Multiple processes are run in parallel in CPU. Sometimes when a high priority process comes up, the kernel transfers control of the CPU to that process.

33 .

UNIX is written in which language?

A)

C#

B)

C++

C)

.NET

D)

C Language

Correct Answer : C Language

Explanation : UNIX is written in C language. It was developed in 1970s at AT & T Bell laboratories.

34 .

Consider a file whose ordering key field is 10 bytes long, the primary index has been created for the file, and the block pointer is 6 bytes long. In this case, if we wish to search a record with the help of an index, then how many block access do we require?

A)

8

B)

9

C)

10

D)

11

Correct Answer : 10

35 .

The lowest number of page frames that are bound to be allocated in an environment of virtual memory to a running process is determined by:

A)

the page size

B)

the size of the physical memory

C)

the total number of processes in memory

D)

the instruction set architecture

Correct Answer : the instruction set architecture

36 .

Multiple words are put in a single cache block for_______

A)

reducing the miss penalty

B)

exploiting the referenceâ€™s spatial locality in a program

C)

exploiting the referenceâ€™s temporal locality in a program

D)

None of the above

Correct Answer : exploiting the referenceâ€™s spatial locality in a program

37 .

An OS implements a policy that needs a process to release all of the resources before it makes any requests for another resource. Out of all the statements below, select the one that is TRUE :

A)

Deadlock cannot occur, but starvation can occur

B)

Deadlock can occur, but starvation cannot occur

C)

Both deadlock and starvation can occur

D)

Neither deadlock nor starvation can occur

Correct Answer : Neither deadlock nor starvation can occur

38 .

Three concurrent processes X, Y, and Z execute three different code segments that access and update certain shared variables. Process X executes the P operation (i.e., wait) on semaphores a, b and c; process Y executes the P operation on semaphores b, c and d; process Z executes the P operation on semaphores c, d, and a before entering the respective code segments. After completing the execution of its code segment, each process invokes the V operation (i.e., signal) on its three semaphores. All semaphores are binary semaphores initialized to one. Which one of the following represents a deadlockfree order of invoking the P operations by the processes?

A)

X: P(b)P(a)P(c) Y:P(b)P(c)P(d) Z:P(a)P(c)P(d)

B)

X: P(a)P(b)P(c) Y:P(b)P(c)P(d) Z:P(c)P(d)P(a)

C)

X: P(a)P(b)P(c) Y:P(c)P(b)P(d) Z:P(c)P(d)P(a)

D)

X: P(b)P(a)P(c) Y:P(c)P(b)P(d) Z:P(a)P(c)P(d)

Correct Answer : X: P(b)P(a)P(c) Y:P(b)P(c)P(d) Z:P(a)P(c)P(d)

39 .

The strategy of allowing processes that are logically runnable to be temporarily suspended is called

A)

preemptive scheduling

B)

shortest job first

C)

first come first served

D)

non preemptive scheduling

Correct Answer : preemptive scheduling

40 .

The LRU algorithm________

A)

pages out the first page in a given area

B)

pages out pages that have been used recently

C)

pages out pages that have been least used recently

D)

pages out pages that have not been used recently

Correct Answer : pages out pages that have been least used recently

41 .

The Storage-to-Storage instructions

A)

have both their operands in the main store.

B)

which perform indicated operations on two fast registers of the machine and have the result in one of the registers

C)

which perform an operation on a register operand and an operand which is located in the main store, generally leaving the result in the register, expect in the case of store operation when it is also written into the specified storage location.

D)

All of the above

Correct Answer : have both their operands in the main store.

42 .

Which of the following is not a feature of the batch Operating system?

A)

Large turnaround time

B)

It is very easy to debug the program in this operating system

C)

Other pending jobs are affected due to a lack of protection schemes

D)

All of the above

Correct Answer : It is very easy to debug the program in this operating system

43 .

What is the main difference between batch Operating systems and time-sharing Operating systems?

A)

In a multi-programmed batch system, the objective is to minimize processor use, whereas, in time-sharing systems, the objective is to maximize response time

B)

In a multi-programmed batch system, the objective is to maximize processor use, whereas, in time-sharing systems, the objective is to minimize response time

C)

Both (A) and (B)

D)

None of the above

Correct Answer : In a multi-programmed batch system, the objective is to minimize processor use, whereas, in time-sharing systems, the objective is to maximize response time

Explanation : In a multi-programmed batch system, the objective is to maximize processor use, whereas, in time-sharing systems, the objective is to minimize response time.

44 .

Which of the following Operating systems use multiple central processors to serve multiple real-time applications and multiple users?

A)

Batch Operating system

B)

Time-sharing Operating System

C)

Multitasking Operating System

D)

Distributed Operating System

Correct Answer : Distributed Operating System

Explanation : Distributed Operating systems use multiple central processors to serve multiple real-time applications and multiple users.

45 .

Which of the following systems software does the job of merging the records from two files into one?

A)

Security software

B)

Documentation system

C)

Utility program

D)

Networking software

Correct Answer : Utility program

46 .

Fork is______

A)

the creation of a new process

B)

the dispatching of a task

C)

the creation of a new job

D)

increasing the priority of a task

Correct Answer : the creation of a new process

47 .

Thrashing_____

A)

always occurs on large computers

B)

can always be avoided by swapping

C)

is a natural consequence of virtual memory systems

D)

can be caused by poor paging algorithms

Correct Answer : can be caused by poor paging algorithms

48 .

Among the Batch operating system and time-sharing operating system, which operating system reduces the CPU idle time?

A)

Batch Operating System

B)

Time-sharing Operating Systems

C)

Both (A) and (B)

D)

None of the above

Correct Answer : Time-sharing Operating Systems

Explanation : In Timesharing Operating Systems, CPU idle time is reduced as it provides a quick response, whereas in batch OS CPU is often idle.

49 .

Which of the following Operating systems runs on a server and provides the server the capability to manage data, users, groups, etc?

A)

Mobile Operating system

B)

Batch Operating system

C)

Network operating system

D)

Real-time Operating system

Correct Answer : Network operating system

Explanation : Network Operating System runs on a server and provides the server the capability to manage data, users, groups, security, applications, and other networking functions.

50 .

Where is the operating system placed in the memory?

A)

in the low memory

B)

in the high memory

C)

either low or high memory (depending on the location of interrupt vector)

D)

None of the above

Correct Answer : either low or high memory (depending on the location of interrupt vector)

51 .

If a process fails, most operating system write the error information to a ______

A)

log file

B)

new file

C)

another running process

D)

None of the above

Correct Answer : log file

Explanation : If a process fails, most operating systems write the error information to a log file. Log file is examined by the debugger, to find out what is the actual cause of that particular problem. Log file is useful for system programmers for correcting errors.

52 .

Which one of the following is not a real time operating system?

A)

QNX

B)

RTLinux

C)

VxWorks

D)

Palm OS

Correct Answer : Palm OS

Explanation : VxWorks, QNX & RTLinux are real-time operating systems. Palm OS is a mobile operating system. Palm OS is developed for Personal Digital Assistants (PDAs).

53 .

Which is the Linux operating system?

A)

Windows operating system

B)

Open-source operating system

C)

Private operating system

D)

None of the above

Correct Answer : Open-source operating system

Explanation : The Linux operating system is an open-source operating system made up of a kernel. It is a very safe operating system.

54 .

What is the full name of the DSM?

A)

Distributed shared memory

B)

Direct system memory

C)

Direct system module

D)

Demoralized system memory

Correct Answer : Distributed shared memory

Explanation : The DSM stands for Distributed Shared Memory.

55 .

What is the full name of the IDL?

A)

Interface data library

B)

Interface direct language

C)

Interface definition language

D)

None of the above

Correct Answer : Interface definition language

Explanation : The IDL stands for Interface Definition Language. It is used to establish communications between clients and servers in RPC (Remote Procedure Call).

56 .

What is bootstrapping called?

A)

Hot boot

B)

Cold boot

C)

Cold hot boot

D)

Cold hot strap

Correct Answer : Cold boot

Explanation : Bootstrapping is also known as the cool boot.

57 .

OS classifies the threads as_______

A)

OS and CPU level

B)

Security and Memory level

C)

Mainframe and motherboard level

D)

Kernel and User level

Correct Answer : Kernel and User level

Explanation : OS classifies the threads into two types - User level thread: Implemented by user and Kernel level thread, implemented by the kernel.

58 .

Among the following CPU scheduling algorithms, which of these allocated the CPU first to the process that requests the CPU first?

A)

SJF

B)

Priority scheduling

C)

FCFS

D)

None of the above

Correct Answer : FCFS

Explanation : FCFS allocates resources to the process that requests first.

59 .

What are the two types of operating modes of AT?

A)

Real mode, protected mode

B)

Direct mode, indirect mode

C)

Private mode, public mode

D)

Virtual mode, dedicated mode

Correct Answer : Real mode, protected mode

Explanation : Two operating modes of AT are Real mode and protected mode.

60 .

What is meant by ready state of a process?

A)

When the process is currently using the CPU

B)

When the process is scheduled to run after some execution

C)

When the process is dependent of the execution time of some other process.

D)

None of the above

Correct Answer : None of the above

Explanation : Ready state of the process means the process has all necessary resources which are required for execution of that process when CPU is allocated.

61 .

Among the following, which is an example of a spooled device?

A)

A I/O device to display graphics.

B)

A line printer that prints the output of a number of jobs.

C)

A terminal that inputs user data

D)

None of the above

Correct Answer : A line printer that prints the output of a number of jobs.

62 .

Main memory of a computer system is?

A)

Volatile

B)

Non-volatile

C)

Restricted

D)

Unrestricted

Correct Answer : Volatile

63 .

In the case of a working-set strategy, which of these is done by the OS to prevent thrashing?

P. If there are enough extra frames, it initiates another process.

Q. It selects any process for suspending in case the sum of the working sets’ sizes exceed the number of available frames.

A)

P only

B)

Q only

C)

Both P and Q

D)

Neither P nor Q

Correct Answer : Both P and Q

64 .

Which of these need not be saved necessarily during context switching between various processes?

A)

Program counter

B)

General-purpose registers

C)

Translation look-aside buffer

D)

None of the above

Correct Answer : Translation look-aside buffer

65 .

Device driver required in?

A)

Cache

B)

Register

C)

Disk

D)

Main Memory

Correct Answer : Disk

Explanation : A disk driver is a device driver that allows a specific disk drive to communicate with the remainder of the computer. A good example of this driver is a floppy disk driver.

66 .

When are the register context and stack of thread deallocated?

A)

when the thread blocks

B)

when the thread spawns

C)

when the thread unblocks

D)

when the thread terminates

Correct Answer : when the thread terminates

67 .

For which of the following is the jacketing technique used?

A)

to construct a new thread

B)

convert a blocking system call into non blocking system call

C)

to communicate between threads

D)

None of the above

Correct Answer : convert a blocking system call into non blocking system call

Explanation : Jacketing technique used to convert a blocking system call into non blocking system call.

68 .

For which of the following is resource sharing used?

A)

Compress the address space a process can use

B)

share the memory and resources of the process to which the threads belong

C)

an application having several threads of activity all within the same address space.

D)

All of the above

Correct Answer : All of the above

Explanation : Resource sharing is used for sharing memory and resources and well as compressing the address space.

69 .

In the case of the index allocation scheme of various blocks to a file, the maximum size (possible) of the file would depend on :

A)

the total number of blocks that have been used for the index, size of all the blocks

B)

the actual size of all blocks, the size of the blocksâ€™ address

C)

the of the blocksâ€™ size, the blocksâ€™ address size, and the total number of blocks that have been used for the index

D)

None of the above

Correct Answer : the total number of blocks that have been used for the index, size of all the blocks

70 .

The swap space in a disk is primarily used to :

A)

Save process data

B)

Store the super-block

C)

Store the device drivers

D)

Save temporary HTML pages

Correct Answer : Save process data

71 .

Out of these page replacement algorithms, which one suffers from Belady's anomaly?

A)

LRU

B)

FIFO

C)

Both LRU and FIFO

D)

Optimal Page Replacement

Correct Answer : FIFO

72 .

An increase in a computer's RAM leads to a typical improvement in performance because:

A)

A larger RAM is faster

B)

Virtual memory increases

C)

Fewer page faults occur

D)

Fewer segmentation faults occur

Correct Answer : Fewer page faults occur

73 .

Which of the following is NOT true of deadlock prevention and deadlock avoidance schemes?

A)

Deadlock avoidance is less restrictive than deadlock prevention

B)

Deadlock avoidance requires knowledge of resource requirements a priori

C)

In deadlock avoidance, the request for resources is always granted if the result state is safe

D)

In deadlock prevention, the request for resources is always granted if the resulting state is safe

Correct Answer : In deadlock prevention, the request for resources is always granted if the resulting state is safe

74 .

A system contains three programs and each requires three tape units for its operation. The minimum number of tape units which the system must have such that deadlocks never arise is _________.

A)

6

B)

7

C)

8

D)

9

Correct Answer : 7

Explanation : If 6 resources are there then it may be possible that all three process have 2 resources and waiting for 1 more resource. Therefore, all of them will have to wait indefinitely. If 7 resources are there, then atleast one must have 3 resources so deadlock can never occur.

75 .

Consider the following snapshot of a system running n processes. Process i is holding Xi instances of a resource R, 1 <= i <= n. currently, all instances of R are occupied. Further, for all i, process i has placed a request for an additional Yi instances while holding the Xi instances it already has. There are exactly two processes p and q such that Yp = Yq = 0. Which one of the following can serve as a necessary condition to guarantee that the system is not approaching a deadlock?

A)

max (Xp, Xq) > 1

B)

min (Xp, Xq) > 1

C)

Xp + Xq >= min (Yk) where k != p and k != q

D)

min (Xp, Xq) < max (Yk) where k != p and k != q

Correct Answer : Xp + Xq >= min (Yk) where k != p and k != q

Explaination :

Deadlock refers to a specific condition when two or more processes are each waiting for another to release a resource, or more than two processes are waiting for resources.

Solution : Necessary condition to guarantee no deadlock which means without satisfying this condition, no deadlock is possible. Both the process p and q have no additional requirement; they both can be finished releasing Xp + Xq resources without asking for any additional resource. Using this, we can finish one more process only if condition B is satisfied. If the resources released by p and q are sufficient for another process waiting for Yk resources, then system is not approaching deadlock. i.e Xp+Xq > min (Yk) where k != p and k != q Note: Option B just ensured that the system can proceed from the current state. It does not guarantee that there won’t be a deadlock before all processes are finished.

76 .

How many types of real-time Operating systems are there?

A)

2

B)

3

C)

4

D)

5

Correct Answer : 2

Explanation : There are two types of real-time Operating Systems: Hard real-time systems, and soft real-time systems.

77 .

In which real-time Operating system, secondary storage is limited or missing and the data is stored in ROM?

A)

Hard real-time systems

B)

Soft real-time system

C)

Both (A) and (B)

D)

None of the above

Correct Answer : Hard real-time systems

Explanation : In a hard real-time system, secondary storage is limited or missing and the data is stored in ROM, moreover in these systems virtual memory is never found.

78 .

How many types of kernels are there?

A)

8

B)

7

C)

6

D)

5

Correct Answer : 5

Explanation : In total there are 5 types of kernels :

* Monolithic kernels
* Microkernel kernels
* Hybrid Kernels
* Nano Kernels
* Exo kernels.

79 .

In which type of kernel does the entire operating system run as a single program?

A)

Nano Kernels

B)

Hybrid Kernels

C)

Monolithic kernel

D)

Microkernel kernels

Correct Answer : Monolithic kernel

Explanation : In a Monolithic kernel, the entire operating system runs as a single program.

80 .

Which of the following does not use Monolithic Kernel?

A)

Linux

B)

Windows 95

C)

Windows 98

D)

Windows 7

Correct Answer : Windows 7

81 .

The function of ____ is to provide a communication facility between the client programs?

A)

Nano Kernels

B)

Microkernel

C)

Hybrid Kernels

D)

Monolithic kernel

Correct Answer : Microkernel

Explanation : The function of a microkernel is to provide a communication facility between the client programs; it also provides a facility for various services that are running in user space.

82 .

What does OS X has?

A)

Hybrid kernel

B)

Microkernel

C)

Monolithic kernel

D)

Monolithic kernel with modules

Correct Answer : Hybrid kernel

Explanation : OS X has a hybrid kernel. Hybrid kernel is a combination of two different kernels. OS X is developed by Apple and originally it is known as Mac OS X.

83 .

In operating system, each process has its own __________

A)

open files

B)

address space and global variables

C)

pending alarms, signals, and signal handlers

D)

All of the above

Correct Answer : All of the above

Explanation : In Operating Systems, each process has its own address space which contains code, data, stack, and heap segments or sections. Each process also has a list of files that is opened by the process as well as all pending alarms, signals, and various signal handlers.

84 .

In a timeshare operating system, when the time slot assigned to a process is completed, the process switches from the current state to?

A)

Ready state

B)

Blocked state

C)

Suspended state

D)

Terminated state

Correct Answer : Ready state

Explanation : In a time-sharing operating system, when the time slot given to a process is completed, the process goes from the running state to the Ready State. In a time-sharing operating system, unit time is defined for sharing CPU, it is called a time quantum or time slice. If a process takes less than 1 time quantum, then the process itself releases the CPU.

85 .

Cascading termination refers to the termination of all child processes if the parent process terminates ______

A)

Normally

B)

Abnormally

C)

Normally or abnormally

D)

None of the above

Correct Answer : Normally or abnormally

Explanation : Cascading termination refers to the termination of all child processes if the parent process terminates Normally or Abnormally. Some systems don’t allow child processes to exist if the parent process has terminated. Cascading termination is normally initiated by the operating system.

86 .

When a process is in a "Blocked" state waiting for some I/O service. When the service is completed, it goes to the __________

A)

Running state

B)

Ready state

C)

Suspended state

D)

Terminated state

Correct Answer : Ready state

Explanation : Suppose that a process is in “Blocked” state waiting for some I/O service. When the service is completed, it goes to the ready state. Process never goes directly to the running state from the waiting state. Only processes which are in ready state go to the running state whenever CPU allocated by operating system.

87 .

What is the fence register used for?

A)

To CPU protection

B)

To disk protection

C)

To memory protection

D)

None of the above

Correct Answer : To memory protection

Explanation : The fence register is used for memory protection on the computer. It is a way to access the memory in the computer.

88 .

If the page size increases, the internal fragmentation is also?

A)

Increases

B)

Decreases

C)

Remains constant

D)

None of the above

Correct Answer : Increases

89 .

Which of the following is a single-user operating system?

A)

MAC

B)

Ms-Dos

C)

Windows

D)

None of the above

Correct Answer : Ms-Dos

Explanation : The single-user operating system is the operating system in which only one user can access the computer system at a time, and Ms-DOS is the best example of a single-user operating system.

90 .

The size of virtual memory is based on which of the following?

A)

RAM

B)

CPU

C)

Data bus

D)

Address bus

Correct Answer : Address bus

Explanation : The size of virtual memory is based on the address bus.

91 .

Identify the system calls that on termination does not return control to the calling point.

A)

fork

B)

ioctl

C)

longjmp

D)

exec

Correct Answer : exec

92 .

Consider the following program:

main()
{
     if(fork()>0)
sleep(100);
}

A)

zombie process

B)

orphan process

C)

infinite process

D)

None of the above

Correct Answer : zombie process

93 .

What of the following defines Thread cancellation?

A)

The process of removing a thread after its work is executed

B)

The process of destroying the thread after its work is executed

C)

The process of terminating a thread process before its execution

D)

None of the above

Correct Answer : The process of terminating a thread process before its execution

94 .

When a thread terminates some target thread immediately, it is known as?

A)

Asynchronous termination

B)

Synchronous termination

C)

Immediate Termination

D)

Deferred cancellation

Correct Answer : Asynchronous termination

Explanation : When a thread terminates some target thread immediately, it is know as Asynchronous termination.

95 .

Which of the following commands in UNIX is used to send a signal?

A)

Send

B)

Kill

C)

Sigsend

D)

None of the above

Correct Answer : Kill

96 .

Transient operating system code is a code that ____________

A)

is not easily accessible

B)

comes and goes as needed

C)

stays in the memory always

D)

never enters the memory space

Correct Answer : comes and goes as needed

97 .

The portion of the process scheduler in an operating system that dispatches processes is concerned with ____________

A)

assigning ready processes to CPU

B)

assigning running processes to blocked queue

C)

assigning ready processes to waiting queue

D)

All of the above

Correct Answer : assigning ready processes to CPU

98 .

A deadlock avoidance algorithm dynamically examines the __________ to ensure that a circular wait condition can never exist.

A)

resources

B)

operating system

C)

system storage state

D)

resource allocation state

Correct Answer : resource allocation state

Explanation : Resource allocation states are used to maintain the availability of the already and current available resources.

99 .

Swapping _______ be done when a process has pending I/O, or has to execute I/O operations only into operating system buffers.

A)

can

B)

must

C)

must never

D)

maybe

Correct Answer : must never

100 .

The operating system is responsible for?

A)

booting from disk

B)

bad-block recovery

C)

disk initialization

D)

All of the above

Correct Answer : All of the above

101 .

The operating system and the other processes are protected from being modified by an already running process because ____________

A)

they have a protection algorithm

B)

they are in different memory spaces

C)

they are in different logical addresses

D)

every address generated by the CPU is being checked against the relocation and limit registers

Correct Answer : every address generated by the CPU is being checked against the relocation and limit registers

102 .

Using transient code, _______ the size of the operating system during program execution.

A)

increases

B)

changes

C)

decreases

D)

maintains

Correct Answer : changes

103 .

If a page number is not found in the translation lookaside buffer, then it is known as a?

A)

Translation Lookaside Buffer miss

B)

Buffer miss

C)

Translation Lookaside Buffer hit

D)

All of the above

Correct Answer : Translation Lookaside Buffer miss

Explanation : A Translation Lookaside Buffer miss arises when the page table entry needed to translate a virtual address to a physical address is not available in the translation lookaside buffer.

104 .

Which of the following supports Windows 64 bit?

A)

Window 1998

B)

Window 2000

C)

Windows XP

D)

None of the above

Correct Answer : Windows XP

Explanation : Windows XP supports the 64-bits. Windows XP is designed to expand the memory address space. Its original name is Microsoft Windows XP Professional x64 and it is based on the x86-64 architecture.

105 .

Which of the following windows does not have a start button?

A)

Windows XP

B)

Windows 7

C)

Windows 8

D)

None of the above

Correct Answer : Windows 8

Explanation : Windows 8 does not have a start button because it uses the tablet mode, but windows 8.1 has a start button.

106 .

Which of the following operating systems does not support more than one program at a time?

A)

MAC

B)

Linux

C)

Windows

D)

DOS

Correct Answer : DOS

Explanation : DOS stands for Disk operating system. Disk operating system is a single-user operating system that does not support more than one program at a time.

107 .

Select the correct definition of spooling.

A)

Spooling is a type of fast memory

B)

Spooling holds a single copy of data

C)

Spooling holds copy of all data in the system

D)

None of the above

Correct Answer : Spooling holds a single copy of data

108 .

Which of the following is the only state transition that is initiated by the user process itself?

A)

block

B)

wakeup

C)

dispatch

D)

None of the above

Correct Answer : block

Explanation : The only state transition that is initiated by the user process itself is block. Whenever a user process initiates an I/O request it goes into block state unless and until the I/O request is not completed.

109 .

Identify the two steps of a process execution.

A)

I/O & OS Burst

B)

Memory & I/O Burst

C)

CPU and Memory burst

D)

CPU & I/O Burst

Correct Answer : CPU & I/O Burst

110 .

Consider a computer system that supports 32-bit physical as well as virtual addresses. Now since the space of the physical address is the same size as the virtual address, the OS designers would decide to entirely get rid of its virtual memory. Which one of these is true in this case?

A)

It is possible to make CPU scheduling more efficient now

B)

It is no longer possible to efficiently implement multi-user support

C)

There would no longer be a requirement for hardware support for memory management

D)

It would be possible to make the processor cache organisation more efficient now

Correct Answer : There would no longer be a requirement for hardware support for memory management

111 .

A CPU yields 32-bit virtual addresses, and the page size is 4 kilobytes. Here, the processor consists of a TLB (translation lookaside buffer). It is a 4-way set associative, and it can hold a total of 128-page table entries. The TLB tagâ€™s minimum size is:

A)

20 bits

B)

15 bits

C)

13 bits

D)

11 bits

Correct Answer : 15 bits

112 .

Consider that the page fault service time in a computer is 10ms and the average memory access time is 20ns. If, in case, it generates a page fault every 10^6 memory accesses, then what would be the effective access time for this memory?

A)

30ns

B)

35ns

C)

45ns

D)

50ns

Correct Answer : 30ns

113 .

In every entry of a page table, the essential content(s) is/are:

A)

Page frame number

B)

Virtual page number

C)

Accessing the right information

D)

Both page frame number and virtual page number

Correct Answer : Page frame number

114 .

When translating a virtual address to a physical address, a multilevel page table is always a preference as compared to a single level page because it______

A)

Is required by the lookaside buffer translation

B)

Reduces the total memory access time for reading or writing a memory location

C)

Helps in the reduction of the total page faults in the page replacement algorithms

D)

Helps in the reduction of the page table size required for implementing a processâ€™s virtual address space

Correct Answer : Helps in the reduction of the page table size required for implementing a processâ€™s virtual address space

115 .

Which of the following instruction steps, would be written within the diamond-shaped box, of a flowchart?

A)

PRINT A

B)

S = B - C

C)

IS A<10

D)

DATA X,4Z

Correct Answer : IS A<10

116 .

___ refers to putting data of various I/O jobs in the buffer.

A)

Processors

B)

Spooling

C)

Memory Buffer

D)

None of the above

Correct Answer : Spooling

Explanation : Spooling refers to putting data of various I/O jobs in the buffer; this buffer is a special area in memory.

117 .

Which of the following is the main advantage of a microprocessor system?

A)

Economy of scale

B)

Increased throughput

C)

Increased reliability

D)

All of the above

Correct Answer : All of the above

Explanation : Increased throughput, Economy of scale, and increased reliability are the three main advantages of a microprocessor system.

118 .

How many components does the Linux Operating system have?

A)

3

B)

4

C)

5

D)

6

Correct Answer : 3

Explanation : Linux Operating system has primarily three components: - Kernel, System library, system utility.

119 .

A collection of the node which contains the information about all the files is known as ____?

A)

Files

B)