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Operating System Mcq [SET - 10] | Operating System mcq for Placement

 

operating system mcq for placement



1. In the instruction ADD A, B, the answer gets stored in                        





ANSWER= (A) a 

 

2. What does PC stand for?

    program changer
    program counter
    performance counter

ANSWER= (B) program counter

 

3. Which of the following holds the last instruction fetched?





ANSWER= (D) ir

 

4. The portion of the processor which contains the hardware required to fetch the operations is               

    datapath
    processor
    control

ANSWER= (A) datapath

 

5. The backing store is generally a

    fast disk
    disk large enough to accommodate copies of all memory images for all users
    disk to provide direct access to the memory images

ANSWER= (D) all of the mentioned

 

6. When the head damages the magnetic surface, it is known as                    

    disk crash
    head crash
    magnetic damage

ANSWER= (B) head crash

 

7. The process to be aborted is chosen on the basis of the following factors?

    priority of the process
    process is interactive or batch
    how long the process has computed

ANSWER= (D) all of the mentioned

 

8. What is the disk bandwidth?

    the total number of bytes transferred
    total time between the first request for service and the completion on the last transfer
    the total number of bytes transferred divided by the total time between the first request for service and the completion on the last transfer

ANSWER= (C) the total number of bytes transferred divided by the total time between the first request for service and the completion on the last transfer

 

9. The primary distinction between the short term scheduler and the long term scheduler is :

    The length of their queues
    The type of processes they schedule
    The frequency of their execution

ANSWER= (C) The frequency of their execution

 

10. Which of the following Is not a part of the operating system?

    Input/output control program
    Job control program
    Supervisor

ANSWER= (D) Performance monitor

 

11. The number of sign bits in a 32-bit IEEE format is          





ANSWER= (A) 1

 

12. The transfer between CPU and Cache is

    block transfer
    word transfer
    set transfer

ANSWER= (B) word transfer

 

13. Computer has a built-in system clock that emits millions of regularly spaced electric pulses per       called clock cycles.

    second
    millisecond
    microsecond

ANSWER= (A) second

 

14. What is thrashing?

    A high paging activity is called thrashing.
    A high executing activity is called thrashing
    A extremely long process is called thrashing

ANSWER= (A) A high paging activity is called thrashing.

 

15. Magnetic tape drives can write data at a speed  disk drives.

    much lesser than
    comparable to
    much faster than

ANSWER= (B) comparable to

 

16.  Which types of file organization are supported by Magnetic Tape?

    Contiguous Sequential File
     Random Files
     Indexed Sequential File

ANSWER= (A) Contiguous Sequential File

 

17. Which of the following is not a popular desktop operating system?

     iOS
    Android
    Mountain Lion

ANSWER= (C) Mountain Lion

 

18. In UNIX, the system call is used to send a signal.

    sig
    send
     kill

ANSWER= (C) kill

 

19. Windows operating system follows __________ type of kernel architecture

    Monolithic
    Micro
    Macro

ANSWER= (D)  Hybrid

 

20. What is interprocess communication?

    communication within the process
    communication between two process
    communication between two threads of same process

ANSWER= (A)  communication between two process


 

21. Thread pools are useful when

    when we need to limit the number of threads running in the application at the same time
    when we need to limit the number of threads running in the application as a whole
    when we need to arrange the ordering of threads

ANSWER= (A) when we need to limit the number of threads running in the application at the same time

 

22. Resource sharing helps                        

    share the memory and resources of the process to which the threads belong
    an application have several different threads of activity all within the same address space
    reduce the address space that a process could potentially use

ANSWER= (D) all of the mentioned

 

23. The kernel is of user threads.

    a part of
    the creator of
    unaware of

ANSWER= (C) unaware of

 

24. Because the kernel thread management is done by the Operating System itself

    kernel threads are faster to create than user threads
     kernel threads are slower to create than user threads
     kernel threads are easier to manage as well as create then user threads

ANSWER= (B) kernel threads are slower to create than user threads

 

25. If a kernel thread performs a blocking system call,                          

     the kernel can schedule another thread in the application for execution
    the kernel cannot schedule another thread in the same application for execution
    the kernel must schedule another thread of a different application for execution

ANSWER= (A)  the kernel can schedule another thread in the application for execution

 

26. FCFS algorithm is used by

    FIFO
     LIFO
    LIFO and FIFO

ANSWER= (A) FIFO

 

27. The macro process must perform

     Recognize macro definitions and macrocells
    Save the macro definitions
    Expand macro calls and substitute arguments

ANSWER= (D) All the above

 

28. The memory implemented using the semiconductor chips is                    

    cache
    main
    secondary

ANSWER= (A) main

 

29. Which of the following is the fastest means of memory access for CPU?

    registers
    cache
    main memory

ANSWER= (A) registers

 

30. A process in general needs certain recourses

    CPU time
    Memory
    I/O Device

ANSWER= (D) All of the above



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