Question 1

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

Accepted Answer

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 B

Question 2

For most computers, the bootstrap is stored in ____.

Accepted Answer

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

Question 3

When is the Many to One model at an advantage ?

Accepted Answer

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 A

Question 4

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

Accepted Answer

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

Question 5

The One to One model allows :

Accepted Answer

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

Question 6

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

Accepted Answer

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 7

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

Accepted Answer

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 8

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

Accepted Answer

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

Question 9

Defective sectors on disks are often known as __________.

Accepted Answer

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

Question 10

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

Accepted Answer

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 11

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

Accepted Answer

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

Exam 5: Operating Systems and Disk Management