Operating System MCQ (Multiple Choice Questions) - SchoolingAxis

Operating System MCQ (Multiple Choice Questions)

 Que- What is a medium-term scheduler ? 

a. It selects which process has to be brought into the ready queue 

b. It selects which process has to be executed next and allocates CPU 

c. It selects which process to remove from memory by swapping 

d. None of the mentioned  


Answer- It selects which process to remove from memory by swapping        


Que- What is a short-term scheduler ? 

a. It selects which process has to be brought into the ready queue 

b. It selects which process has to be executed next and allocates CPU 

c. It selects which process to remove from memory by swapping 

d. None of the mentioned  


Answer- It selects which process has to be executed next and allocates CPU        


Que- The primary distinction between the short term scheduler and the long term scheduler is : 

a. The length of their queues 

b. The type of processes they schedule 

c. The frequency of their execution 

d. None of the mentioned 


Answer- The frequency of their execution        


Que- The only state transition that is initiated by the user process itself is : 

a. block 

b. wakeup 

c. dispatch 

d. none of the mentioned 


Answer- block        


Que- 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 : 

a. Blocked state 

b. Ready state 

c. Suspended state 

d. Terminated state 


Answer- Ready state        


Que- In a multiprogramming environment : 

a. the processor executes more than one process at a time 

b. the programs are developed by more than one person 

c. more than one process resides in the memory 

d. a single user can execute many programs at the same time 


Answer- more than one process resides in the memory        


Que- Suppose that a process is in "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 


Answer- Ready state        


Que- Which process can be affected by other processes executing in the system? 

a. cooperating process 

b. child process 

c. parent process 

d. init process  


Answer- cooperating process        


Que- When several processes access the same data concurrently and the outcome of the execution depends on the particular order in which the access takes place, is called 

a. dynamic condition 

b. race condition 

c. essential condition 

d. critical condition  


Answer- race condition        


Que- If a process is executing in its critical section, then no other processes can be executing in their critical section. This condition is called 

a. mutual exclusion 

b. critical exclusion 

c. synchronous exclusion 

d. asynchronous exclusion  


Answer- mutual exclusion        


Que- Which one of the following is a synchronization tool? 

a. thread 

b. pipe 

c. semaphore 

d. socket  


Answer- semaphore        


Que- A semaphore is a shared integer variable 

a. that can not drop below zero 

b. that can not be more than zero 

c. that can not drop below one 

d. that can not be more than one  


Answer- that can not drop below zero        


Que- Mutual exclusion can be provided by the 

a. mutex locks 

b. binary semaphores 

c. both mutex locks and binary semaphores 

d. none of the mentioned  


Answer- both mutex locks and binary semaphores        


Que- When high priority task is indirectly preempted by medium priority task effectively inverting the relative priority of the two tasks, the scenario is called 

a. priority inversion 

b. priority removal 

c. priority exchange 

d. priority modification  


Answer- priority inversion        


Que- Process synchronization can be done on 

a. hardware level 

b. software level 

c. both hardware and software level 

d. none of the mentioned  


Answer- both hardware and software level        


Que- A monitor is a module that encapsulates 

a. shared data structures 

b. procedures that operate on shared data structure 

c. synchronization between concurrent procedure invocation 

d. all of the mentioned  


Answer- all of the mentioned         


Que- To enable a process to wait within the monitor, 

a. a condition variable must be declared as condition 

b. condition variables must be used as boolean objects 

c. semaphore must be used 

d. all of the mentioned  


Answer- a condition variable must be declared as condition        


Que- Restricting the child process to a subset of the parent's resources prevents any process from : 

a. overloading the system by using a lot of secondary storage 

b. under-loading the system by very less CPU utilization 

c. overloading the system by creating a lot of sub-processes 

d. crashing the system by utilizing multiple resources 


Answer- overloading the system by creating a lot of sub-processes        


Que- A parent process calling _____ system call will be suspended until children processes terminate. 

a. wait 

b. fork 

c. exit 

d. exec 


Answer- wait        


Que- Cascading termination refers to termination of all child processes before the parent terminates ______ 

a. Normally 

b. Abnormally 

c. Normally or abnormally 

d. None of the mentioned 


Answer- Normally        


Que- 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. 

a. Multiprocessing, Multiprogramming 

b. Multiprogramming, Uniprocessing 

c. Multiprogramming, Multiprocessing 

d. Uniprogramming, Multiprocessing 


Answer- Uniprogramming, Multiprocessing        


Que- In UNIX, each process is identified by its : 

a. Process Control Block 

b. Device Queue 

c. Process Identifier 

d. None of the the mentioned 


Answer- Process Identifier        


Que- In UNIX, the return value for the fork system call is _____ for the child process and _____ for the parent process. 

a. A Negative integer, Zero 

b. Zero, A Negative integer 

c. Zero, A nonzero integer 

d. A nonzero integer, Zero 


Answer- Zero, A nonzero integer        


Que- The child process can : 

a. be a duplicate of the parent process 

b. never be a duplicate of the parent process 

c. cannot have another program loaded into it 

d. never have another program loaded into it 


Answer- be a duplicate of the parent process        


Que- The child process completes execution,but the parent keeps executing, then the child process is known as : 

a. Orphan 

b. Zombie 

c. Body 

d. Dead 


Answer- Zombie        


Que- Inter process communication : 

a. allows processes to communicate and synchronize their actions when using the same address space 

b. allows processes to communicate and synchronize their actions without using the same address space 

c. allows the processes to only synchronize their actions without communication 

d. none of the mentioned 


Answer- allows processes to communicate and synchronize their actions without using the same address space        


Que- Message passing system allows processes to : 

a. communicate with one another without resorting to shared data 

b. communicate with one another by resorting to shared data 

c. share data 

d. name the recipient or sender of the message 


Answer- communicate with one another without resorting to shared data        


Que- An IPC facility provides at least two operations : 

a. write & delete message 

b. delete & receive message 

c. send & delete message 

d. receive & send message 


Answer- receive & send message        


Que- Messages sent by a process : 

a. have to be of a fixed size 

b. have to be a variable size 

c. can be fixed or variable sized 

d. None of the mentioned 


Answer- can be fixed or variable sized        


Que- The link between two processes P and Q to send and receive messages is called : 

a. communication link 

b. message-passing link 

c. synchronization link 

d. all of the mentioned 


Answer- communication link        


Que- Which of the following are TRUE for direct communication : 

a. A communication link can be associated with N number of process(N = max. number of processes supported by system) 

b. A communication link can be associated with exactly two processes 

c. Exactly N/2 links exist between each pair of processes(N = max. number of processes supported by system) 

d. Exactly two link exists between each pair of processes 


Answer- A communication link can be associated with exactly two processes        


Que- In indirect communication between processes P and Q : 

a. there is another process R to handle and pass on the messages between P and Q 

b. there is another machine between the two processes to help communication 

c. there is a mailbox to help communication between P and Q 

d. none of the mentioned 


Answer- there is a mailbox to help communication between P and Q        


Que- In the non blocking send : 

a. the sending process keeps sending until the message is received 

b. the sending process sends the message and resumes operation 

c. the sending process keeps sending until it receives a message 

d. none of the mentioned 


Answer- the sending process sends the message and resumes operation        


Que- In the Zero capacity queue : 

a. the queue can store at least one message 

b. the sender blocks until the receiver receives the message 

c. the sender keeps sending and the messages don't wait in the queue 

d. none of the mentioned 


Answer- the sender blocks until the receiver receives the message        


Que- The Zero Capacity queue : 

a. is referred to as a message system with buffering 

b. is referred to as a message system with no buffering 

c. is referred to as a link 

d. none of the mentioned 


Answer- is referred to as a message system with no buffering        


Que- Bounded capacity and Unbounded capacity queues are referred to as : 

a. Programmed buffering 

b. Automatic buffering 

c. User defined buffering 

d. No buffering 


Answer- Automatic buffering        


Que- Remote Procedure Calls are used : 

a. for communication between two processes remotely different from each other on the same system 

b. for communication between two processes on the same system 

c. for communication between two processes on separate systems 

d. None of the mentioned 


Answer- for communication between two processes on separate systems        


Que- To differentiate the many network services a system supports ______ are used. 

a. Variables 

b. Sockets 

c. Ports 

d. Service names 


Answer- Ports        


Que- RPC provides a(an) _____ on the client side, a separate one for each remote procedure. 

a. stub 

b. identifier 

c. name 

d. process identifier 


Answer- stub        


Que- The stub : 

a. transmits the message to the server where the server side stub receives the message and invokes procedure on the server side 

b. packs the parameters into a form transmittable over the network 

c. locates the port on the server 

d. all of the mentioned 


Answer- all of the mentioned        


Que- To resolve the problem of data representation on different systems RPCs define _____________ 

a. machine dependent representation of data 

b. machine representation of data 

c. machine-independent representation of data 

d. none of the mentioned 


Answer- machine-independent representation of data        


Que- The full form of RMI : 

a. Remote Memory Installation 

b. Remote Memory Invocation 

c. Remote Method Installation 

d. Remote Method Invocation 


Answer- Remote Method Invocation        


Que- The remote method invocation : 

a. allows a process to invoke memory on a remote object 

b. allows a thread to invoke a method on a remote object 

c. allows a thread to invoke memory on a remote object 

d. allows a process to invoke a method on a remote object 


Answer- allows a thread to invoke a method on a remote object        


Que- A process that is based on IPC mechanism which executes on different systems and can communicate with other processes using message based communication, is called ________ 

a. Local Procedure Call 

b. Inter Process Communication 

c. Remote Procedure Call 

d. Remote Machine Invocation 


Answer- Remote Procedure Call        


Que- The initial program that is run when the computer is powered up is called : 

a. boot program 

b. bootloader 

c. initializer 

d. bootstrap program 


Answer- bootstrap program        


Que- How does the software trigger an interrupt ? 

a. Sending signals to CPU through bus 

b. Executing a special operation called system call 

c. Executing a special program called system program 

d. Executing a special program calle interrupt trigger program 


Answer- Executing a special operation called system call        


Que- What is a trap/exception ? 

a. hardware generated interrupt caused by an error 

b. software generated interrupt caused by an error 

c. user generated interrupt caused by an error 

d. none of the mentioned 


Answer- software generated interrupt caused by an error        


Que- What is an ISR ? 

a. Information Service Request 

b. Interrupt Service Request 

c. Interrupt Service Routine 

d. Information Service Routine 


Answer- Interrupt Service Routine        


Que- An interrupt vector 

a. is an address that is indexed to an interrupt handler 

b. is a unique device number that is indexed by an address 

c. is a unique identity given to an interrupt 

d. none of the mentioned 


Answer- is an address that is indexed to an interrupt handler        


Que- DMA is used for : 

a. High speed devices(disks and communications network) 

b. Low speed devices 

c. Utilizing CPU cycles 

d. All of the mentioned 


Answer- High speed devices(disks and communications network)        


Que- In a memory mapped input/output : 

a. the CPU uses polling to watch the control bit constantly, looping to see if device is ready 

b. the CPU writes one data byte to the data register and sets a bit in control register to show that a byte is available 

c. the CPU receives an interrupt when the device is ready for the next byte 

d. the CPU runs a user written code and does accordingly 


Answer- the CPU writes one data byte to the data register and sets a bit in control register to show that a byte is available        


Que- In a programmed input/output(PIO) : 

a. the CPU uses polling to watch the control bit constantly, looping to see if device is ready 

b. the CPU writes one data byte to the data register and sets a bit in control register to show that a byte is available 

c. the CPU receives an interrupt when the device is ready for the next byte 

d. the CPU runs a user written code and does accordingly 


Answer- the CPU uses polling to watch the control bit constantly, looping to see if device is ready        


Que- In an interrupt driven input/output : 

a. the CPU uses polling to watch the control bit constantly, looping to see if device is ready 

b. the CPU writes one data byte to the data register and sets a bit in control register to show that a byte is available 

c. the CPU receives an interrupt when the device is ready for the next byte 

d. the CPU runs a user written code and does accordingly 


Answer- the CPU receives an interrupt when the device is ready for the next byte        


Que- In the layered approach of Operating Systems : 

a. Bottom Layer(0) is the User interface 

b. Highest Layer(N) is the User interface 

c. Bottom Layer(N) is the hardware 

d. Highest Layer(N) is the hardware 


Answer- Highest Layer(N) is the User interface        


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