Operating Systems 

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An operating system (OS), in its most general sense, is software that allows a user to run other applications on a computing device. While it is possible for a software application to interface directly with hardware, the vast majority of applications are written for an OS, which allows them to take advantage of common libraries and not worry about specific hardware details. The OS also provides services to facilitate the efficient execution and management of, and memory allocations for, any additional installed software application programs.

What is operating system?
Which one of the following is not true?
Which facility dynamically adds probes to a running system, both in user processes and in the kernel?
Which one of the following error will be handle by the operating system?
What is the ready state of a process?
In operating system, each process has its own
What is interprocess communication?
Which system call returns the process identifier of a terminated child?
A Process Control Block(PCB) does not contain which of the following :
The degree of multiprogramming is:
Which of the following is not the state of a process?
The entry of all the PCBs of the current processes is in:
Which of the following do not belong to queues for processes ?
What is a long-term scheduler ?
The primary distinction between the short term scheduler and the long term scheduler is :
Suppose that a process is in “Blocked” state waiting for some I/O service. When the service is completed, it goes to the :
A parent process calling _____ system call will be suspended until children processes terminate.
If a process is executing in its critical section, then no other processes can be executing in their critical section. This condition is called
With _____________ only one process can execute at a time; meanwhile all other process are waiting for the processor. With ______________ more than one process can be running simultaneously each on a different processor.
The child process completes execution,but the parent keeps executing, then the child process is known as :
The link between two processes P and Q to send and receive messages is called :
To differentiate the many network services a system supports ______ are used.
RPC provides a(an) _____ on the client side, a separate one for each remote procedure.
How does the software trigger an interrupt ?
The initial program that is run when the computer is powered up is called :
Which module gives control of the CPU to the process selected by the short-term scheduler?
With multiprogramming, ______ is used productively.
An un-interruptible unit is known as :
The two atomic operations permissible on semaphores are :
Concurrent access to shared data may result in :
What is the reusable resource?
The number of resources requested by a process :
Which of the following condition is required for deadlock to be possible?
Multithreaded programs are :
A deadlock avoidance algorithm dynamically examines the __________ to ensure that a circular wait condition can never exist.
A deadlock eventually cripples system throughput and will cause the CPU utilization to ______
The data structures available in the Banker’s algorithm are :
If we preempt a resource from a process, the process cannot continue with its normal execution and it must be :
A computer system has 6 tape drives, with ‘n’ processes competing for them. Each process may need 3 tape drives. The maximum value of ‘n’ for which the system is guaranteed to be deadlock free is :
If the resources are always preempted from the same process, __________ can occur.
Dynamic loading is :
If binding is done at assembly or load time, then the process _____ be moved to different locations after being swapped out and in again.
Run time mapping from virtual to physical address is done by
Smaller page tables are implemented as a set of _______
Memory management technique in which system stores and retrieves data from secondary storage for use in main memory is called
__________ is generally faster than _________ and _________
Physical memory is broken into fixed-sized blocks called ________
Logical memory is broken into blocks of the same size called _________
A solution to the problem of external fragmentation is :
The operating system maintains a ______ table that keeps track of how many frames have been allocated, how many are there, and how many are available.
In paging the user provides only ________ which is partitioned by the hardware into ________ and ______
Consider a computer with 8 Mbytes of main memory and a 128K cache. The cache block size is 4 K. It uses a direct mapping scheme for cache management. How many different main memory blocks can map onto a given physical cache block ?
A ________ is a collection of electronics that can operate a port, a bus, or a device.
When device A has a cable that plugs into device B, and device B has a cable that plugs into device C and device C plugs into a port on the computer, this arrangement is called a _________
The ________ keeps state information about the use of I/O components.
A ________ is a full duplex connection between a device driver and a user level process.
In real time operating system
For real time operating systems, interrupt latency should be
The disadvantage of real addressing mode is :
Event latency is :
To schedule the processes, they are considered _________
There are two processes P1 and P2, whose periods are 50 and 100 respectively. P1 is assigned higher priority than P2. The processing times are t1 = 20 for P1 and t2 = 35 for P2. Is it possible to schedule these tasks so that each meets its deadline using Rate monotonic scheduling ?
A multimedia file
Which one of the following resource is not necessarily required on a file server?
The ability to move around within a media stream is known as :
For a computer to deliver continuous media it must guarantee the specific rate and timing requirements, also known as :
Multimedia systems require _________ scheduling to ensure critical tasks will be serviced within timing deadlines.
The EDF scheduler uses ________ to order requests according to their deadlines.
The three general methods for delivering content from a server to a client across a network are :
RTSP includes the following states :
From the following, which is not a common file permission ?
What does Light Directory Access Protocol (LDAP) doesn’t store ?
What is breach of confidentiality ?
What is known as DOS attack ?
What is not a important part of security protection ?
What is known as sandbox ?
What are characteristics of signature based IDS ?
What are characteristics of stack based IDS ?
What is not an encryption standard ?
What is a Hash Function ?
Which one of the following is not a secondary storage?
Which algorithm of disk scheduling selects the request with the least seek time from the current head positions?
Linux uses a time-sharing algorithm
Which desktop environment is not used in any linux distribution?
Which one of the following is not a valid state of a thread?
The register context and stacks of a thread are deallocated when the thread
A thread is also called :
Because the kernel thread management is done by the Operating System itself :
The model in which one kernel thread is mapped to many user-level threads is called :
When is the Many to One model at an advantage ?
Which of the following system calls does not return control to the calling point, on termination ?
Which of the following calls never returns an error ?
Which of the following objects require protection ?
Which of the following objects require protection ?
Your new question!
The host sets _____ bit when a command is available for the controller to execute.
Internet provides _______ for remote login.
The capability of a system to adapt the increased service load is called
The solution to the problem of reliability is the introduction of __________
The technique of duplicating every disk is known as :
Using swap space significantly _________ system performance.
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