Quiz
OS Part 2 2
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Perguntas do quiz (25)
1If the accessed word is not found in the faster memory, that is defined as a:
- Aricochet
- Bmiss
- Czero
- Dloss
2The processor contains a single data register, called
- APSW
- BPC
- CIR
- DAC
3Which register contains the instruction most recently fetched?
- Ainstruction register
- Bexecution register
- Cprogram counter
- Dprocess counter
4This register specifies the location in memory for the next read or write
- AMemory address register
- BI/OAR
- CMemory buffer register
- DI/OBR
5Which of the following element of a computer system moves data between the computer and its external environment?
- AMain memory
- BProcessor
- CSystem bus
- DI/O modules
6This main disadvantage of this technique: consumes a lot of processor time, because every word of data that goes from memory to I/O module or from I/O module to memory must pass through the processor
- ADirect memory access (DMA)
- BManual memory access
- CInterrupt-driven I/O
- DProgrammed I/O
7The processor issues an I/O command to a separate module, by sending the type of operation (read/write), the address of the I/O device, the starting location in memory for data, number of words. Then the processor continues with other work. The module transfers the entire block of data to/from memory without going through the processor. The described technique is:
- ADirect memory access (DMA)
- BManual memory access
- CInterrupt-driven I/O
- DProgrammed I/O
8The processor issues an I/O command to a module and waits, periodically checking the status of the I/O module until it finds that the operation is complete.
The I/O module performs the requested action and then sets the appropriate bits in the I/O status register but takes no further action to alert the processor.
The described technique is:- ADirect memory access (DMA)
- BManual memory access
- CInterrupt-driven I/O
- DProgrammed I/O
9The processor is executing "Load AC from memory" instruction. Choose the correct micro-instruction:
- APC -> MAR
M -> MBR
MBR -> AC
IR -> MAR
M -> MBR
MBR -> AC - BPC -> MBR
M -> MAR
MAR -> IR
IR -> MAR
M -> MBR
MBR -> AC - CPC -> MAR
M -> MBR
MBR -> IR
IR -> MAR
M -> MBR
MBR -> AC - DPC -> MAR
M -> MBR
MBR -> IR
IR -> MBR
M -> MAR
MAR -> AC
- APC -> MAR
10If there no interrupts, after each write operation, the processor must:
- ALoad new PC value
- BFinish execution of current instruction
- CSave the PSW and PC onto control stack
- DPause and remain idle until the I/O operation finishes
11Complete the relationship concerning the memory systems: greater capacity
- Alower capacity
- Bgreater cost per bit
- Cfaster access speed
- Dsmaller cost per bit
12User-visible registers minimize main memory references by optimizing register use
- AVerdadeiro
- BFalso
13This register contains the data to be written into memory or which receives the data read from memory
- AI/OAR
- Bmemory buffer register
- Cmemory address register
- DI/OBR
14Which of the following element of a computer system controls the operation of the computer and performs its data processing functions?
- ASystem bus
- BMain memory
- CI/O modules
- DProcessor
15The main disadvantages of this technique: there is a competition for bus usage
- AInterrupt-driven I/O
- BProgrammed I/O
- CManual memory access
- DDirect memory access (DMA)
16At the beginning of each instruction cycle, the processor fetches an instruction from the memory. The address of the instruction is held in
- AIR
- BMBR
- CMAR
- DPC
17The smaller, more expensive, faster memory is:
- ADisk drive
- BCache
- CMain memory
- DRegister
18There were no OS with
- ASimple batch systems
- BSerial processing
- CTime-sharing-systems
- DMultiprogrammed batch systems
19The principal objective of the time-sharing system is to
- AMinimize response time
- BMinimize processor utilization
- CMaximize response time
- DMaximize processor utilization
20Serial processing was used
- AIn early 1960s
- BFrom late 1940s to the mid-1950s
- CFrom the mid-1950s to early 1960s
21The programmer interacted directly with the computer hardware with
- ASimple batch systems
- BSerial processing
- CTime-sharing-systems
- DMultiprogrammed batch systems
22In operation system security and protection, availability is:
- AConcerned with the proper verification of the identity of users and the validity of messages or data
- BAssuring that users cannot read data for which access is unauthorized
- CProtection of data from unauthorized modification
- DConcerned with protecting the system against interruption
23Choose the storage management responsibility for "The OS can achieve efficiency by assigning memory to jobs only as needed"
- AProcess isolation
- BProtection and access control
- CLong-term storage
- DSupport of modular programming
- EAutomatic allocation and management
24The limit register
- ADefines the size of the region of memory occupied by the process (in bytes or words)
- BContains the index into the process list of the process currently controlling the processor
- CPoints to the next instruction in that process to be executed
- DContains the staring address of the region of memory occupied by the process
25"More than one programs hung up waiting for each other".
This is- AFailed mutual exclusions
- BDeadlocks
- CNondeterminate program operation
- DImproper synchronization
Informações
- Descrição
- 2 Digital Technologies Quiz sobre OS Part 2 2, criado por Bekinston Talgio em 03-07-2019.
- Autor
- Bekinston Talgio
- Idioma
- English
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