一．选择题（20分，每题1分）
1. Generally speaking, which one is not the major concern for a operating system in the following four options?( D )
A.Manage the computer
B.Manage the system resources
C.Design and apply the interface between ur's program and computer hardware system
D.High-level programming language complier
2. The main disadvantage of batch system is ( C )
A.CPU utilization is low
B.Can not concurrent
C.Lack of interaction
D.Low degree of automation
3. A process transforms from waiting state to ready state is caud by the ( B )
A.Interrupt event
B.Process scheduling
C.Create a process for a program
D.Waiting for some events
4. The concurrent process is refers to ( C )
A.The process can be run in parallel
B.The process can be run in order
C.The process can be run in the same time
D.The process can not be interrupted
5. In multi-process system, in order to ensure the integrity of public variables, the process should be mutually exclusive access to critical areas. The so-called critical area is ( D )
A.A buffer
B.A date area
C.Synchronization mechanism
D.A program
6. The orderly u of resources allocation strategy can destroy the condition ( D ) to avoid deadlock.
A.Mutual exclusive
B.Hold and wait
C.No preemption
D.Circular wait
7. Ur's applications u the system resources to complete its operation by the support and rvices of ( C )
A.clicking the mou
B.Keyboard command
C.System call
D.Graphical ur interface
8. There are four jobs arrived at the same time and the execution time of each job is 2h. Now they run on one processor at single channel,then the average turnaround time is ( B )
A.1h
B.5h
C.2.5h
D.8h
9. Among the job scheduling algorithms, ( B ) is related to the job's estimated running time.
A.FCFS scheduling algorithm
B.Short-job-first scheduling algorithm
C.High respon ratio algorithm
D.Balanced scheduling
10.In memory management, the purpo of using the overlay and swapping is ( C )
A.Sharing main memory
B.Expanding main memory physically
C.Saving main memory space
D.Improving CPU utilization
11.In the page-replacement algorithm,which one can cau the Belady phenomenon? ( A )
A.FIFO
B.LRU
C.CLOCKING
D.OPT
12. The following description of the system in safe state,which one is correct?( B )
A.It must cau deadlock if the system is in incure state
B.It may cau deadlock if the system is in incure state
C.It may cau deadlock if the system is in cure state
D.All are wrong
13.Generally, when we talk about"Memory Protection", the basic meaning is ( C )
A.Prevent hardware memory from damaging
B.Prevent program from losing in memory
C.Prevent the cross-border call between programs
D.Prevent the program from being peeped
14.The actual capacity of virtual memory is equal to ( B )
A.The capacity of external memory(disk)
B.The sum of the capacity of external memory and main memory
C.The space that the CPU logical address gives
D.The smaller one between the option B and C
15.Physical file's organization is determined by ( D )
A.Applications
B.Main memory capacity
C.External memory capacity
D.Operating system
16.A computer system is configured with two plotters and three printers,in order to properly drive the devices,system should provide ( C ) device driver program.
A.5
B.3
C.2
D.1
17.When there are fewer number of channels in system ,it may cau "bottlenecks".To solve this problem,which of the follow options is not the effective way?( A )
A.improving the speed of CPU
B.Using the virtual device technology
C.Adding some hardware buffer on the devices
D.Increasing the path between devices and channels
18.When I/O devices and main memory are exchanging data, it can be achieved without CPU's frequently intervention,this way of exchanging data is called ( C )
A.Polling
B.Interrupts
C.Direct memory access
D.None of them
19. The following description of device management, which one is not correct?( B )
A.All external devices are managed by the system in uniform
B.Channel is a software of controlling input and output
C.The I/O interrupt events from the I/O channel are managed by device management
D.One of the responsibility of the operating system is to u the hardware effectively
20.The operating system ud ( A ), it realized a mechanism that we can u more space to save more time.
A.SPOOLING
B.Virtual storage
C.Channel
D.Overlay
二．填空题（20分，每空1分）
1.Software may trigger an interrupt by executing a special operation called a system call .(P7)
2.If there is only one general-purpo CPU,then the system is a single-processor system.(p12)
3. A process can be thought of as a program in execution. (p79)
