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158 Operating Systems Questions and answers section with explanation for various online exam preparation, various interviews, Computer Knowledge Operating Systems online test. Operating Systems Questions with detailed description, explanation will help you to master the topic.

Operating Systems Questions

1. Which of these is a disadvantage of first Come First Serve?



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Correct Ans:Convoy Effect
Explanation:


2. Which of these is not a goal of Scheduling Algorithm for Different Operating Systems



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Correct Ans:maximize throughput
Explanation:


3. Which of these is incorrect in context of Real Time Operating System?



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Correct Ans:Doesn't allow programmer to define interrupts and interrupt processing routines
Explanation:


4. Which of these are the reasons for CPU-bound programs having higher priority than the I/O bound programs



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Correct Ans:All of the above
Explanation:


5. Throughput of a multiprogramming OS that processes n programs over the period of time that starts t0 and ends at tf is



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Correct Ans:n/(tf-t0)
Explanation:


6. Which of the following should be a privileged instruction-



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Correct Ans:All of the above
Explanation:


7. Contents of which fields of Program Status Word (PSW) define the subsequent actions of the CPU



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Correct Ans:Privileged mode, interrupt mask, Program Counter
Explanation:


8. An Intel processor uses a cache block size of 128 bytes and a memory transfer to cache is about 10 times the access time of cache memory. with cache hit ratio of 0.97 what percent will be the effective memory access to that of access time of memory



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Correct Ans:40 percent
Explanation:


9. Processor architectures use several levels of cache memories to reduce the effective memory access time. which is the correct match

i) L1 Cache ------ a) part of memory chip
ii) L2 Cache ------ b) Cache on CPU Chip
iii) L3 Cache ------ c) Cache external to CPU



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Correct Ans:i)-b ii)-c iii)-a
Explanation:


10. Which term means to access some data and instructions repeatedly?



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Correct Ans:temporal locality
Explanation:


11. Programs tend to make memory accesses that are in proximity of previous access this is called



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Correct Ans:spatial locality
Explanation:


12. If ttra and tcam are the time taken to transfer a block from memory to cache and access time of cache memory respectively, then what will be the effective memory access time if h is the hit ratio



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Correct Ans:h*tcam +(1-h) *(ttra+tcam)
Explanation:


13. Which OS employs the techniques of fault tolerance and graceful degradation to ensure continuity of operation?



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Correct Ans:Real time
Explanation:


14. What feature of RTOS is supported by executing parts of a computation in different computer systems?



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Correct Ans:Computation speed up
Explanation:


15. Applications like Banking and reservations require which type of OS?



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Correct Ans:Soft Real Time
Explanation:


16. What are the functions of multiprogramming OS?



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Correct Ans:All of above
Explanation:


17. What in multiprogramming OS provides a foolproof method of implementing memory protection to avoid program interference?



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Correct Ans:Both (b) and (c)
Explanation:


18. This OS interleaves execution of processes in an application program to meet its deadline



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Correct Ans:Real time
Explanation:


19. Which operating system implementation has to focus on the issue of resource sharing?



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Correct Ans:Distributed
Explanation:


20. Program Priorities, Preemption are the key concepts of



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Correct Ans:Multiprogramming
Explanation:



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