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Operating System Mcq [SET - 3] | Operating System Mcq for BCA

 

operating system mcq for bca

1.  A process having multiple threads of control implies                        

    it can do more than one task at a time
    it can do only one task at a time, but much faster
    it has to use only one thread per process

ANSWER= (A) it can do more than one task at a time

 

2. To access the services of operating system, the interface is provided by the

    system calls
    API
    library

ANSWER= (D) assembly instructions

 

3. By using ___ techniques, an operating system can create the illusion that a process has its own processor with its own memory.

    CPU Scheduling
    Virtual Memory
    Both A and B

ANSWER= (C) Both A and B

 

4. The multi-user Operating System is based on the concept of ____

    Time-losing
    Time-spooling
    Time-gaining

ANSWER= (D) Time-sharing

 

5. Run time mapping from virtual to physical address is done by                          

    memory management unit
    cpu
    pci

ANSWER= (A) memory management unit

 

6. Memory management technique in which system stores and retrieves data from secondary storage for use in main memory is called?

    fragmentation
    paging
    mapping

ANSWER= (B) paging

 

7.  Which structure prohibits the sharing of flies and directories?

    One level structure
     Two level structure
     Tree structure

ANSWER= (C) Tree Structure

 

8. The minimum number of page frames that must be allocated to a running process in a virtual memory environment is determined by

    the instruction set architecture
     page size
    physical memory size

ANSWER= (A) the instruction set architecture

 

9. The heads of the magnetic disk are attached to a that moves all the heads as a unit.

    spindle
    disk arm
    track

ANSWER= (B) disk arm

 

10.  The set of tracks that are at one arm position make up a                        

    magnetic disks
    electrical disks
    assemblies

ANSWER= (D)  cylinders

 

11. On media that use constant linear velocity (CLV), the is uniform.

     density of bits on the disk
    density of bits per sector
    the density of bits per track

ANSWER= (C) the density of bits per track

 

12. Access time is the highest in the case of .............. 

     Swapping Devices
     Cache
    Floppy Disk

ANSWER= (D) Magnetic Disks

 

13.  Wild-card specifiers ................

    Can be used when writing a file
    Are only used when printing the contents of files
     Provide an easy way of finding groups of related files

ANSWER= (A) Provide an easy way of finding groups of related files

 

14. A fork system call will fail if

    the previously executed statement is also a fork call
    the limit on the maximum number of processes in the system would be executed
     the limit on the minimum number of processes that can be under execution by a single user would be executed

ANSWER= (B) the limit on the maximum number of processes in the system would be executed

 

15. If a thread invokes the exec system call

    only the exec executes as a separate process
    the program specified in the parameter to exec will replace the entire process
    the exec is ignored as it is invoked by a thread

ANSWER= (B) the program specified in the parameter to exec will replace the entire process

 

16. In most cases, if a process is sent a signal while it is executing a system call

    the system call will continue execution and the signal will be ignored completely
    the system call is interrupted by the signal, and the signal handler comes in
    the signal has no effect until the system call completes

ANSWER= (C) the signal has no effect until the system call completes

 

17. Which of the following option is an example of a real-time operating system?

    MAC OS
    MS-DOS
     Process Control

ANSWER= (C) Process Control

 

18. When the process issues an I/O request                      

    It is placed in an I/O queue
    It is placed in a waiting queue
    It is placed in the ready queue

ANSWER= (A)  It is placed in an I/O queue

 

19. Which one of the following is the deadlock avoidance algorithm?


    banker’s algorithm
    elevator algorithm
    karn’s algorithm

ANSWER= (A) banker’s algorithm

 

20. Which of the following are the two parts of the file name?

    name & identifier
    identifier & type
    extension & name

ANSWER= (C) extension & name

 

21. Which of the following are forms of malicious attack?

    Theft of information
    Modification of data
     Wiping of information

ANSWER= (D) All of the mentioned

 

22. From the following, which is not a common file permission?

    Write
    Execute
    Stop

ANSWER= (C) Stop

 

23. In linux a user can load or upload

      I/O Modules
    I/O Devices
    File Base I/O

ANSWER= (A) Kernal Modules

 

24. Aqua user interface was appeared with?

    Shells
    MAC OS
    Windows
ANSWER= (B) MAC OS

 

25. Operating system manages ................

    Memory
    Processor
    I/O Devices

ANSWER= (D) All of the above

 

26. OS does not boot itself when a system is ...............

    Reset
    Restarted
    Powered on

ANSWER= (D) Shutdown



27. With a shared file                            

     actual file exists
    there are two copies of the file
    the changes made by one person are not reflected to the

ANSWER= (D) the changes made by one person are reflected to the other

 

28. The multi-user Operating System is based on the concept of .................

    Time-losing
     Time-gaining
    Time-sharing

ANSWER= (A) Time-sharing

 

29. To enable a process to wait within the monitor                      

     a condition variable must be declared as condition
     condition variables must be used as boolean objects
    semaphore must be used

ANSWER= (A) a condition variable must be declared as condition

 

30.There are two types of interproccess communication, _________ and __________

     message receiving, dedicated memory
    message passing,shared memory
    information sharing, primary memory

ANSWER= (B) message passing,shared memory



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