Computer/Operating System MCQ Set 13 Sample Test,Sample questions

Question:
 A virtual memory system uses First In First Out (FIFO) page replacement policy and allocates a fixed number of frames to a process. Consider the following statements.
P : Increasing the number of page frames allocated to a process sometimes increases the page fault rate
Q : Some programs do not exhibit locality of reference
Which of the following is TRUE?

1. Both P and Q are true, and Q is the reason for P

2.Both P and Q are true, but Q is not the reason for P

3.P is false but Q is true

4.Both P and Q are false


Question:
 Cancellation point is the point where ______

1.the thread can be cancelled – safely or otherwise doesn’t matter

2. the thread can be cancelled safely

3.the whole process can be cancelled safely

4.None of the mentioned


Question:
 If multiple threads are concurrently searching through a database and one thread returns the result then the remaining threads must be ____

1.continued

2.cancelled

3. protected

4.None of the mentioned


Question:
 If no frames are free, _____ page transfer(s) is/are required.

1.one

2.two

3.three

4.four


Question:
 If the thread pool contains no available thread ______

1.the server runs a new process

2.the server goes to another thread pool

3.the server demands for a new pool creation

4.the server waits until one becomes free


Question:
 Signals that occur at the same time, are presented to the process _______

1.one at a time, in a particular order

2.one at a time, in no particular order

3.all at a time

4.None of the mentioned


Question:
 Thread pools limit the number of threads that exist at any one point, hence _______

1.not letting the system resources like CPU time and memory exhaust

2.helping a limited number of processes at a time

3.not serving all requests and ignoring many

4.None of the mentioned


Question:
 When a process blocks the receipt of certain signals?

1.The signals are delivered

2. The signals are not delivered

3.The signals are received until they are unblocked

4.The signals are received by the process once they are delivered


Question:
 When the target thread periodically checks if it should terminate and terminates itself in an orderly manner, it is called?

1.Asynchronous cancellation

2.Asynchronous cancellation

3.Sudden Termination

4.Deferred cancellation


Question:
A FIFO replacement algorithm associates with each page the _______

1.time it was brought into memory

2.size of the page in memory

3.page after and before it

4. All of the mentioned


Question:
A memory page containing a heavily used variable that was initialized very early and is in constant use is removed, then the page replacement algorithm used is ________

1. LRU

2.LFU

3. FIFO

4. none of the mentioned


Question:
A process can never be sure that a signal it has sent ________

1.has which identifier

2. has not been lost

3.has been sent

4.All of the Mentioned


Question:
A process is thrashing if _____

1.it is spending more time paging than executing

2.it is spending less time paging than executing

3.page fault occurs

4.swapping can not take place


Question:
A process refers to 5 pages, A, B, C, D, E in the order : A, B, C, D, A, B, E, A, B, C, D, E. If the page replacement algorithm is FIFO, the number of page frames is increased to 4, then the number of page transfers _________

1. decreases

2. increases

3.remains the same

4.None of the mentioned


Question:
A process refers to 5 pages, A, B, C, D, E in the order : A, B, C, D, A, B, E, A, B, C, D, E. If the page replacement algorithm is FIFO, the number of page transfers with an empty internal store of 3 frames is?

1.8

2.10

3.9

4.7


Question:
Because of virtual memory, the memory can be shared among ______

1.processes

2. threads

3. instructions

4.None of the mentioned


Question:
Cancelling a thread asynchronously ______

1. frees all the resources properly

2. may not free each resource

3. spoils the process execution

4. none of the mentioned


Question:
Each connection arriving at multi threaded servers via network is generally ______

1.is directly put into the blocking queue

2.is wrapped as a task and passed on to a thread pool

3.is kept in a normal queue and then sent to the blocking queue from where it is dequeued

4.None of the mentioned


Question:
Effective access time is directly proportional to ______

1.page-fault rate

2.hit ratio

3. memory access time

4.None of the mentioned


Question:
In FIFO page replacement algorithm, when a page must be replaced _______

1.oldest page is chosen

2.newest page is chosen

3.random page is chosen

4.none of the mentioned


Question:
In most cases, if a process is sent a signal while it is executing a system call _____

1.the system call will continue execution and the signal will be ignored completely

2.the system call is interrupted by the signal, and the signal handler comes in

3.the signal has no effect until the system call completes

4.None of the mentioned


Question:
In UNIX, the abort() function sends the ________ signal to the calling process, causing abnormal termination.

1.SIGTERM

2.SIGSTOP

3.SIGABORT

4.SIGABRT


Question:
In UNIX, the set of masked signals can be set or cleared using the ________ function.

1.sigmask

2.sigmaskproc

3.sigprocmask

4.sigproc


Question:
In UNIX, the ______________ system call is used to send a signal.

1.sig

2.send

3.kill

4.sigsend


Question:
Instead of starting a new thread for every task to execute concurrently, the task can be passed to a ____

1.process

2.thread pool

3. thread queue

4.None of the mentioned


Question:
Signals are identified by _____

1. signal identifiers

2.signal handlers

3. signal actions

4.none of the mentioned


Question:
Signals of a given type _______

1.are queued

2. are all sent as one

3.cannot be queued

4.None of the mentioned


Question:
Swap space exists in ______

1.primary memory

2.secondary memory

3.cpu

4.None of the mentioned


Question:
The aim of creating page replacement algorithms is to ______

1.replace pages faster

2. increase the page fault rate

3. decrease the page fault rate

4.to allocate multiple pages to processes


Question:
The number of the threads in the pool can be decided on factors such as ______

1.number of CPUs in the system

2.amount of physical memory

3.expected number of concurrent client requests

4. all of the mentioned


Question:
The pager concerns with the ______

1.individual page of a process

2.entire process

3.entire thread

4.first page of a process


Question:
The three ways in which a process responds to a signal are _______

1. ignoring the signal

2. handling the signal

3.performing some default action

4. All of the mentioned


Question:
The usefulness of signals as a general inter process communication mechanism is limited because _______

1.they do not work between processes

2.they are user generated

3. they cannot carry information directly

4.None of the mentioned


Question:
The usual effect of abnormal termination of a program is _______

1.core dump file generation

2.system crash

3. program switch

4.signal destruction


Question:
The _______ maintains pending and blocked bit vectors in the context of each process.

1.CPU

2.Memory

3.Process

4.kernel


Question:
Thread pools are useful when _______

1.when we need to limit the number of threads running in the application at the same time

2.when we need to limit the number of threads running in the application at the same time

3.when we need to arrange the ordering of threads

4.None of the mentioned


Question:
Thread pools help in ________

1.servicing multiple requests using one thread

2.servicing a single request using multiple threads from the pool

3.faster servicing of requests with an existing thread rather than waiting to create a new thread

4.None of the mentioned


Question:
Users _______ that their processes are running on a paged system.

1. are aware

2.are unaware

3. may unaware

4. none of the mentioned


Question:
What is the idea behind thread pools?

1.a number of threads are created at process startup and placed in a pool where they sit and wait for work

2.when a process begins, a pool of threads is chosen from the many existing and each thread is allotted equal amount of work

3.all threads in a pool distribute the task equally among themselves

4.None of the mentioned


Question:
What is the Optimal page – replacement algorithm?

1.Replace the page that has not been used for a long time

2.Replace the page that has been used for a long time

3.Replace the page that will not be used for a long time

4.None of the mentioned


Question:
What is Thread cancellation?

1.the task of destroying the thread once its work is done

2. the task of removing a thread once its work is done

3.the task of terminating a thread before it has completed

4.None of the mentioned


Question:
When a page is selected for replacement, and its modify bit is set _________

1.the page is clean

2. the page has been modified since it was read in from the disk

3.the page is dirty

4. the page has been modified since it was read in from the disk & page is dirty


Question:
When a program tries to access a page that is mapped in address space but not loaded in physical memory, then ______

1.segmentation fault occurs

2. fatal error occurs

3.page fault occurs

4.no error occurs


Question:
When a web page is loading, and the user presses a button on the browser to stop loading the page?

1.the thread loading the page continues with the loading

2.the thread loading the page does not stop but continues with another task

3.the thread loading the page is paused

4.the thread loading the page is cancelled


Question:
When one thread immediately terminates the target thread, it is called _______

1.Asynchronous cancellation

2.Systematic cancellation

3.Sudden Termination

4.Deferred cancellation


Question:
Which algorithm chooses the page that has not been used for the longest period of time whenever the page required to be replaced?

1.first in first out algorithm

2.additional reference bit algorithm

3.least recently used algorithm

4.counting based page replacement algorithm


Question:
Which of the following is not TRUE?

1. Processes may send each other signals

2.Kernel may send signals internally

3. A field is updated in the signal table when the signal is sent

4.Each signal is maintained by a single bit


Question:
Which of the following page replacement algorithms suffers from Belady’s Anomaly?

1. Optimal replacement

2.LRU

3.FIFO

4.Both optimal replacement and FIFO


Question:
Working set model for page replacement is based on the assumption of ____

1.modularity

2. locality

3.globalization

4.random access


Question:
____ is the concept in which a process is copied into the main memory from the secondary memory according to the requirement.

1. Paging

2.Demand paging

3.Segmentation

4.Swapping


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