Quiz 1 Study Guide
True or False
1. The MAR is the address register for memory.
2. The MAR is the address of the buffer area where data is stored in memory.
3. The PC is a register for the program control.
4. The IR is a register for the information housed in memor
5. I/O devices and the CPU can execute concurrently.
6. Each device controller is in charge of a particular device type.
7. Each device controller has a local buffer.
8. CPU moves data from/to main memory to/from local buffers
9. Device controller informs CPU that it has finished its operation by causing an
interrupt
.
10. Interrupt architecture must save the address of the interrupted instruction.
11. Incoming interrupts are disabled while another interrupt is being processed to
prevent a lost interrupt.
12. One of the most expensive type of storage is disk storage.
13. One of the fastest types of storage is cache.
14. An operating system is interrupt driven.
15. Virtual memory allows execution of processes not completely in memory
16. Multi-threaded processes and single threaded process have ONLY one program
counter
17. In 1980 ______________, won the Turing Award.
18. The operating system kernel consists of all system and application programs in a
computer.
19. Flash memory is slower than DRAM but needs no power to retain its contents.
20. A system call is triggered by hardware.
21. UNIX does not allow users to escalate privileges to gain extra permissions for a
restricted activity.
22. Processors for most handheld devices run at a fraction of the speed of a processor
in a PC.
Fill in the Blanks
23. __________ was the developer of the quicksort.
24. ___________ is the ability to run multiple programs on the same machine at the
same time
25. ____________is the ability to use multiple processors on the same machine.
26. ______________is running one process at a time is what type of processing
27. ___________is running multiple processes on a machine is what type of
processing
28. : _________ is having multiple threads per address space
29. A ______ or exception is a software generated interrupt caused by an error or user
request.
30. A program in the _________ state has control of the CPU
31. A program in the _________ state is waiting for I/O or another thread
32. A program that is on the ready list, waiting for the CPU is in the ________ state.
Multiple Choice
1. Which of the following is NOT a characteristic of the bootstrap program
a. Stored in ROM or EPROM
b. Initializes the system
c. Loads OS kernel
d. Dispatches user programs for initial processing
2. An interrupt does the following activities EXCEPT which one
a. transfers control to a interrupt service routine
b. gets its address for transfer from an interrupt vector
c. stops execution of the current program
d. causes the I/O devices to halt while it services its interrupt
e. none of the above.
3. A software-generated interrupt caused either by an error or a user request is called
a. Soft Interrupt
b. Trap
c. Window
d. Halting mechanism
4. Multiprogramming is needed for efficiency because of all the reasons below
EXCEPT
a. Single user cannot keep CPU and I/O devices busy at all times
b. organizing jobs (code and data) so CPU always has one to execute
c. Users generally enter data slowly
d. A subset of total jobs in system is kept in memory
e. When it has to wait (for I/O for example), OS switches to another job
5. In what way is an operating system like a government?
a. It seldom functions correctly.
b. It creates an environment within which other programs can do useful
work.
c. It performs most useful functions by itself.
d. It is always concerned primarily with the individual's needs.
6.
____ operating systems are designed primarily to maximize resource utilization.
a. PC
b. Handheld computer
c. Mainframe
d. Network
7. The most common secondary storage device is ____.
a. random access memory
b. dynamic random access memory
c. tape drives
d. magnetic disk
8. Which of the following would lead you to believe that a given system is an SMP
type system
a. Each processor is assigned a specific task.
b. There is a master-slave relationship between the processors.
c. Each processor performs all tasks within the operating system.
d. None of the above
9. A ____ can be used to prevent a user program from never returning control to the
operating system.
a. portal
b. program counter
c. firewall
d. timer
10. Embedded computers typically run on a ____ operating system.
a. real-time
b. Windows XP
c. network
d. clustered
11. Bluetooth and 802.11 devices use wireless technology to communicate over
several feet, in essence creating a ____.
a. local-area network
b. wide-area network
c. small-area network
d. metropolitan-area network
12. A clustered system ____
a. gathers together multiple CPUs to accomplish computational work
b. is an operating system that provides file sharing across a network
c. is used when rigid time requirements are present
d. can only operate one application at a time
13. Which of the following is a property of peer-to-peer systems?
a. Clients and servers are not distinguished from one another.
b. Separate machines act as either the client of the server but not both.
c. They do not offer any advantages over traditional client-server systems.
d. They suffer from the server acting as the bottleneck in performance.
14. Two important design issues for cache memory are ____/
a. .speed and volatility
b. size and replacement policy
c. power consumption and reusability
d. size and access privileges
Short Answer
1. Explain why an operating system can be viewed as a resource allocator.
2. Explain the purpose of an interrupt vector.
3. What is a bootstrap program, and where is it stored?
4. What role do device controllers and device drivers play in a computer system?
5. Why are clustered systems considered to provide high-availability service?
6. Describe the differences between physical, virtual, and logical memory.
7. Describe the operating system's two modes of operation.
8. Explain cache coherency.
9. Why is main memory not suitable for permanent program storage or backup
purposes? Furthermore, what is the main disadvantage to storing information on a
magnetic disk drive as opposed to main memory?
10. Describe the compute-server and file-server types of server systems.