Advanced Operating System Set 5 MCQs

Q1 | In the Many to One model, multiple threads are unable to run in parallel on multiprocessors because :

only one thread can access the kernel at a time

many user threads have access to just one kernel thread

there is only one kernel thread

none of these

Q2 | The One to One model allows :

increased concurrency

decreased concurrency

increased or decreased concurrency

concurrency equivalent to other models

Q3 | In the One to One model when a thread makes a blocking system call :

other threads are strictly prohibited from running

other threads are allowed to run

other threads only from other processes are allowed to run

none of these

Q4 | Which of the following is the drawback of the One to One Model ?

increased concurrency provided by this model

decreased concurrency provided by this model

creating so many threads at once can crash the system

creating a user thread requires creating the corresponding kernel thread

Q5 | When is the Many to One model at an advantage ?

when the program does not need multi-threading

when the program has to be multi-threaded

when there is a single processor

none of these

Q6 | In the Many to Many model true concurrency cannot be gained because :

the kernel can schedule only one thread at a time

there are too many threads to handle

it is hard to map threads with each other

none of these

Q7 | In the Many to Many model when a thread performs a blocking system call :

other threads are strictly prohibited from running

other threads are allowed to run

other threads only from other processes are allowed to run

none of these

Q8 | before a disk can store data is known as : (choose all that apply)

partitioning

swap space creation

low-level formatting

physical formatting

Q9 | The data structue for a sector typically contains : (choose all that apply)

header

data area

trailer

main section

Q10 | The header and trailer of a sector contain information used by the disk controller such as _________ and _________.

main section

error correcting codes (ecc)

sector number

disk identifier

Q11 | The two steps the operating system takes to use a disk to hold its files are _______ and ________.

partitioning

swap space creation

caching

logical formatting

Q12 | and then starts the operating system.

main

bootloader

bootstrap

rom

Q13 | For most computers, the bootstrap is stored in ____.

ram

rom

cache

tertiary storage

Q14 | A disk that has a boot partition is called a _________. (choose all that apply)

start disk

system disk

boot disk

all of these

Q15 | Defective sectors on disks are often known as __________.

good blocks

destroyed blocks

bad blocks

none of these