NPTEL Operating System Fundamentals Week 5 Assignment Answers 2024

1. Assume we are running an application on a system with four processing cores. This application has both serial (nonparallel) and parallel components. Also, assume that 60% of this application are executed in parallel and 40% of the application is executed in serial. Based on the Amdahl’s Law, this application gets a speedup (approx.) of

(A) 1.30 times
(B) 1.42 times
(C) 1.25 time
(D) 1.81 times
(E) 1.20 times

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2. The many-to-one multithreading model supports

(A) Many user-level threads only
(B) Many kernel-level threads only
(C) One user-level thread and many kernel-level threads
(D) Many user-level threads and one kernel-level thread
(E) Many user-level threads and many kernel-level threads

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3. Which is of the following multithreading model is unsuitable for multicore systems?

(A) Many-to-one
(B) One-to-one
(C) Many-to-Many
(D) One-to-Many
(E) Many-to-Partial

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4. Which of the multithreading model blocks the entire process if a thread, which is a part of the process, makes a blocking system call?

(A) Many-to-Many
(B) Many-to-one
(C) Many-to-Partial
(D) One-to-Many
(E) One-to-one

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5. Which of the following operating systems does not support the Many-to-Many multithreading model?

(A) Solaris
(B) HP-UX
(C) Tru64 UNIX
(D) IRIX
(E) Windows 11

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6. Which system calls allow the calling thread to wait for another thread to terminate?

(A) pthread_create
(B) pthread_exit
(C) pthread_join
(D) pthread_detach
(E) pthread_wait

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7. Which of the following statements about non-preemptive scheduling is NOT true?

(A) Once a process starts executing, it runs to completion before another process can begin.
(B) It is simpler to implement compared to preemptive scheduling.
(C) It can lead to longer waiting times for processes with short burst times.
(D) It allows the operating system to preempt a running process to give CPU time to a higher-priority process.
(E) It is commonly used in batch-processing systems.

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8. Which of the following is not the task of the dispatcher?

(A) A Dispatcher saves the context (state) of the currently running process.
(B) A Dispatcher restores the context of the next process to run.
(C) A Dispatcher helps to switch the CPU mode between user mode and kernel mode.
(D) A Dispatcher manages the main memory for process scheduling.
(E) A dispatcher provides the control of the CPU to that process that gets selected by the short term-scheduler.

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9. Choose the correct option for FCFS scheduling algorithm.

(A) It ensures the shortest average waiting time.
(B) It is suffered from the convoy effect.
(C) It is a preemptive scheduling algorithm.
(D) It guarantees maximum throughput.
(E) It uses a priority queue to manage processes