Operating System Online exams test3

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Operating System Online Test3

1. A critical region _____.
is a piece of code which only one process executes at a time	is a region prone to deadlock
is a piece of code which only a finite number of processes execute	is found only in Windows NT operation system

2. The mechanism that bring a page into memory only when it is needed is called __________.
Segmentation	Fragmentation
Demand Paging	Page Replacement

3. PCB = ______.
Program Control Block	Process Control Block
Process Communication Block	None of the above

4. FIFO scheduling is ________.
Preemptive Scheduling	Non Preemptive Scheduling
Deadline Scheduling	Fair share scheduling

5. Switching the CPU to another Process requires to save state of the old process and loading new process state is called as __________.
Process Blocking	Context Switch
Time Sharing	None of the above

6. Which directory implementation is used in most Operating System?
Single level directory structure	Two level directory structure
Tree directory structure	Acyclic directory structure

7. The Banker's algorithm is used _____.
to prevent deadlock in operating systems	to detect deadlock in operating systems
to rectify a deadlocked state	none of the above

8. A thread is _____.
a lightweight process where the context switching is low	a lightweight process where the context swithching is high
used to speed up paging	none of the above

9. ______ is a high level abstraction over Semaphore.
Shared memory	Message passing
Monitor	Mutual exclusion

10. A tree sturctured file directory system ______.
allows easy storage and retrieval of file names	is a much debated unecessary feature
is not essential when we have millions of files	none of the above

11. ______ is used in operating system to separate mechanism from policy.
Single level implementation	Two level implementation
Multi level implementation	None

12. The operating system creates _____ from the physical computer.
Virtual space	Virtual computers
Virtual device	None

13. ______ shares characteristics with both hardware and software.
Operating system	Software
Data	None

14. Multiprogramming systems ______.
Are easier to develop than single programming systems	Execute each job faster
Execute more jobs in the same time period	Are used only one large mainframe computers

15. Which is the first program run on a computer when the computer boots up?
System software	Operating system
System operations	None

16. Which is built directly on the hardware?
Computer Environment	Application Software
Operating System	Database System

17. Which of the following Operating System does not implement multitasking truly?
Windows 98	Windows NT
Windows XP	MS DOS

18. Which runs on computer hardware and serve as platform for other software to run on?
Operating System	Application Software
System Software	All

19. Which is the layer of a computer system between the hardware and the user program.
Operating environment	Operating system
System environment	None

20. The primary purpose of an operating system is:
To make the most efficient use of the computer hardware	To allow people to use the computer
To keep systems programmers employed	To make computers easier to use