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

Accepted Answer

A

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

Accepted Answer

The One to One model allows increased concurrency because each user-level thread maps to a kernel thread, allowing multiple threads to run in parallel on multiple processors.

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

Accepted Answer

In the One to One model, when a thread makes a blocking system call, the kernel can schedule other threads in the same process to run. This model allows for better concurrency within a process, as not all threads are blocked by a single thread's system call.

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

Accepted Answer

In the One to One Model, each user thread is mapped to a kernel thread, which can be resource-intensive and may limit the number of threads due to system constraints.

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

Accepted Answer

When the program does not need multi-threading, the Many to One model is at an advantage because it can take advantage of the single processor to improve performance.

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

Accepted Answer

The Many to Many model allows multiple user-level threads to be mapped to multiple kernel threads, but the kernel can still only schedule one thread at a time per processor, limiting true concurrency.

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

Accepted Answer

In the Many to Many model, when a thread performs a blocking system call, other threads in the same process are still allowed to run. This model decouples the number of threads in the application from the number of threads the kernel manages, allowing other threads to continue execution even if one thread is blocked.

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

Accepted Answer

The answer of The header and trailer of a sector...

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

Accepted Answer

The answer of The two steps the operating system takes...

Question 10

For most computers, the bootstrap is stored in ____.
A)ram
B)rom
C)cache
D)tertiary storage

Accepted Answer

The bootstrap, also known as the boot program or bootloader, is stored in ROM (Read-Only Memory), specifically in a portion called the BIOS (Basic Input/Output System) for PCs, because it needs to be non-volatile and accessible upon power-up before the operating system loads.

Question 11

Defective sectors on disks are often known as __________.
A)good blocks
B)destroyed blocks
C)bad blocks
D)none of these

Accepted Answer

Defective sectors on disks are commonly referred to as "bad blocks." These are areas of the disk that are damaged and cannot reliably store data.

Quiz 5: Operating Systems and Disk Management

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

The One to One model allows :

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

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

When is the Many to One model at an advantage ?

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

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

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

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

For most computers, the bootstrap is stored in ____.

Defective sectors on disks are often known as __________.