Operating System Mcqs

Page No. 58

In the Many to Many model true concurrency cannot be gained because ___________


athe kernel can schedule only one thread at a time


bthere are too many threads to handle


cit is hard to map threads with each other


dnone of the mentioned



When is the Many to One model at an advantage?


aWhen the program does not need multithreading


bWhen the program has to be multi-threaded


cWhen there is a single processor


dNone of the mentioned



Which of the following is the drawback of the One to One Model?


aincreased concurrency provided by this model


bdecreased concurrency provided by this model


ccreating so many threads at once can crash the system


dcreating a user thread requires creating the corresponding kernel thread



In the One to One model when a thread makes a blocking system call ___________


aother threads are strictly prohibited from running


bother threads are allowed to run


cother threads only from other processes are allowed to run


dnone of the mentioned



The One to One model allows ___________


aincreased concurrency


bdecreased concurrency


cincreased or decreased concurrency


dconcurrency equivalent to other models


View Answer increased concurrency

In the Many to One model, multiple threads are unable to run in parallel on multiprocessors because of ___________


aonly one thread can access the kernel at a time


bmany user threads have access to just one kernel thread


cthere is only one kernel thread


dnone of the mentioned



In the Many to One model, if a thread makes a blocking system call ___________


athe entire process will be blocked


ba part of the process will stay blocked, with the rest running


cthe entire process will run


dnone of the mentioned



The model in which one user-level thread is mapped to many kernel level threads is called ___________


aMany to One model


bOne to Many model


cMany to Many model


dOne to One model


View Answer One to Many model

The model in which one kernel thread is mapped to many user-level threads is called ___________


aMany to One model


bOne to Many model


cMany to Many model


dOne to One model


View Answer Many to One model

If a process does not call exec after forking ____________


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


ball the threads should be duplicated


call the threads should not be duplicated


dnone of the mentioned



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