MadeEasy Full Length Test 2019: Operating System - Threads

Question

Consider the following statements:

S1  : Multiprogramming is used to increase CPU utilization, while time-sharing is used to increase CPU responsiveness in interacting with user.

S2  : If a user-level thread is blocked for I/O operation, then kernel of operating system will perform context switching to run another user-thread which is not blocked.

S3  : Many-to-One is the most efficient model of multi-threading because it allows several userlevel threads to be assigned to different processors in a multi-processor computer system.

Which of the following is true?

Comments

we made blog, we made comments on many more questions, still so many people doesn't change...

due to this reason, i lost interest to answer the known question

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some people don't respect the things that are available to them for free.

@Shaik Masthan

cant we display the message for not adding duplicate questions in the home page similar to when we were told to add the tag of test series name due to copyright issues.

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Duplicate:

https://gateoverflow.in/270283/threads

Answer 1

s2 is false because kernel never know how many threads in user level so if one thread of user level blocked then all threads are blocked as kernel assume there is only one process in userlevel space so it can't schedule to another thread