Threads Questions

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21.

Because the kernel thread management is done by the Operating System itself ___________

A

kernel threads are faster to create than user threads

B

kernel threads are slower to create than user threads

C

kernel threads are easier to manage as well as create then user threads

D

none of the mentioned

Correct Answer: B

None.

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22.

If a kernel thread performs a blocking system call, ____________

A

the kernel can schedule another thread in the application for execution

B

the kernel cannot schedule another thread in the same application for execution

C

the kernel must schedule another thread of a different application for execution

D

the kernel must schedule another thread of the same application on a different processor

Correct Answer: A

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23.

Which of the following is FALSE?

A

Context switch time is longer for kernel level threads than for user level threads

B

User level threads do not need any hardware support

C

Related kernel level threads can be scheduled on different processors in a multiprocessor system

D

Blocking one kernel level thread blocks all other related threads

Correct Answer: D

None.

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24.

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

A

Many to One model

B

One to Many model

C

Many to Many model

D

One to One model

Correct Answer: A

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25.

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

A

Many to One model

B

One to Many model

C

Many to Many model

D

One to One model

Correct Answer: B

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26.

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

A

the entire process will be blocked

B

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

C

the entire process will run

D

none of the mentioned

Correct Answer: A

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27.

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

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 the mentioned

Correct Answer: A

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28.

The One to One model allows ___________

A

increased concurrency

B

decreased concurrency

C

increased or decreased concurrency

D

concurrency equivalent to other models

Correct Answer: A

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29.

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 the mentioned

Correct Answer: B

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30.

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

Correct Answer: D

None.

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