Deck 5: Operating Systems and Disk Management

Question 1

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

A)only one thread can access the kernel at a time
B)many user threads have access to just one kernel thread
C)there is only one kernel thread
D)none of these

Answer 1

only one thread can access the kernel at a time

Question 2

The One to One model allows :

A)increased concurrency
B)decreased concurrency
C)increased or decreased concurrency
D)concurrency equivalent to other models

Answer 2

increased concurrency

Question 3

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

A)other threads are strictly prohibited from running
B)other threads are allowed to run
C)other threads only from other processes are allowed to run
D)none of these

Answer 3

other threads are allowed to run

Question 4

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

A)increased concurrency provided by this model
B)decreased concurrency provided by this model
C)creating so many threads at once can crash the system
D)creating a user thread requires creating the corresponding kernel thread

Question 5

When is the Many to One model at an advantage ?

A)when the program does not need multi-threading
B)when the program has to be multi-threaded
C)when there is a single processor
D)none of these

Question 6

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

A)the kernel can schedule only one thread at a time
B)there are too many threads to handle
C)it is hard to map threads with each other
D)none of these

Question 7

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

A)other threads are strictly prohibited from running
B)other threads are allowed to run
C)other threads only from other processes are allowed to run
D)none of these

Question 8

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

A)main section
B)error correcting codes (ecc)
C)sector number
D)disk identifier

Question 9

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

A)partitioning
B)swap space creation
C)caching
D)logical formatting

Question 10

For most computers, the bootstrap is stored in ____.

A)ram
B)rom
C)cache
D)tertiary storage

Question 11

Defective sectors on disks are often known as __________.

A)good blocks
B)destroyed blocks
C)bad blocks
D)none of these