Operating System Set 23 MCQs

Q1 | Which of the following system calls does not return control to the calling point, on termination?

fork

exec

ioctl

longjmp

Q2 | Which of the following system calls transforms executable binary file into a process?

fork

exec

ioctl

longjmp

Q3 | Which of the following calls never returns an error?

getpid

fork

ioctl

open

Q4 | A fork system call will fail if

the previously executed statement is also a fork call

the limit on the maximum number of processes in the system would be executed

the limit on the minimum number of processes that can be under execution by a single user would be executed

all of the mentioned

Q5 | If a thread invokes the exec system call

only the exec executes as a separate process

the program specified in the parameter to exec will replace the entire process

the exec is ignored as it is invoked by a thread

none of the mentioned

Q6 | If exec is called immediately after forking

the program specified in the parameter to exec will replace the entire process

all the threads will be duplicated

all the threads may be duplicated

none of the mentioned

Q7 | If a process does not call exec after forking

the program specified in the parameter to exec will replace the entire process

all the threads should be duplicated

all the threads should not be duplicated

none of the mentioned

Q8 | What is Thread cancellation?

the task of destroying the thread once its work is done

the task of removing a thread once its work is done

the task of terminating a thread before it has completed

none of the mentioned

Q9 | When a web page is loading, and the user presses a button on the browser to stop loading the page?

the thread loading the page continues with the loading

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

the thread loading the page is paused

the thread loading the page is cancelled

Q10 | When one thread immediately terminates the target thread, it is called

asynchronous cancellation

systematic cancellation

sudden termination

deferred cancellation

Q11 | When the target thread periodically checks if it should terminate and terminates itself in an orderly manner, it is called?

asynchronous cancellation

systematic cancellation

sudden termination

deferred cancellation

Q12 | Cancelling a thread asynchronously

frees all the resources properly

may not free each resource

spoils the process execution

none of the mentioned

Q13 | Cancellation point is the point where

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

the thread can be cancelled safely

the whole process can be cancelled safely

none of the mentioned

Q14 | If multiple threads are concurrently searching through a database and one thread returns the result then the remaining threads must be

continued

cancelled

protected

none of the mentioned

Q15 | Signals that occur at the same time, are presented to the process

one at a time, in a particular order

one at a time, in no particular order

all at a time

none of the mentioned

Q16 | Which of the following is not TRUE?

processes may send each other signals

kernel may send signals internally

a field is updated in the signal table when the signal is sent

each signal is maintained by a single bit

Q17 | Signals of a given type

are queued

are all sent as one

cannot be queued

none of the mentioned

Q18 | The three ways in which a process responds to a signal are

ignoring the signal

handling the signal

performing some default action

all of the mentioned

Q19 | Signals are identified by

signal identifiers

signal handlers

signal actions

none of the mentioned

Q20 | When a process blocks the receipt of certain signals?

the signals are delivered

the signals are not delivered

the signals are received until they are unblocked

the signals are received by the process once they are delivered

Q21 | The maintains pending and blocked bit vectors in the context of each process.

cpu

memory

process

kernel

Q22 | In UNIX, the set of masked signals can be set or cleared using the function.

sigmask

sigmaskproc

sigprocmask

sigproc

Q23 | The usefulness of signals as a general inter process communication mechanism is limited because

they do not work between processes

they are user generated

they cannot carry information directly

none of the mentioned

Q24 | The usual effect of abnormal termination of a program is

core dump file generation

system crash

program switch

signal destruction

Q25 | In most cases, if a process is sent a signal while it is executing a system call

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

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

the signal has no effect until the system call completes

none of the mentioned