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OS Part 2

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Suicidal Operating Systems [Teachers: Teshebayeva Karagoz, Mishina Aigerim ; Final Exam + STATE EXAM] ▼ Quiz sobre OS Part 2, criado por Good Guy Beket em 18-12-2017.
Good Guy Beket
Quiz por Good Guy Beket, atualizado more than 1 year ago Mais Menos
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Resumo de Recurso

Questão 1

Questão
A situation where several processes access and manipulate the same data concurrently and the outcome of the execution depends on the particular order in which access takes place is called:
Responda
  • race condition
  • data consistency
  • starvation
  • mutual exclusion

Questão 2

Questão
Which one of the following is the address generated by CPU?
Responda
  • logical address
  • physical address
  • absolute address
  • none of the above

Questão 3

Questão
What is the ready state of a process?
Responda
  • when process is scheduled to run after some execution
  • none of the above
  • when process is using CPU
  • when process is unable to run until some task has been completed

Questão 4

Questão
Mutual exclusion can be provided by the:
Responda
  • none of the above maint
  • mutex locks
  • both
  • binary semaphores

Questão 5

Questão
What is a long-term scheduler?
Responda
  • it selects which process has to be executed next and allocates CPU
  • none of the above
  • it selects which process has to be brought into the ready queue
  • it selects which process has to remove from memory by swapping

Questão 6

Questão
Operating system maintains the page table for
Responda
  • each process
  • each thread
  • each instruction
  • each address

Questão 7

Questão
If a page number is not found in the TLB, then it is known as a:
Responda
  • TLB miss
  • buffer miss
  • TLB hit
  • page fault

Questão 8

Questão
Part of a program where the shared memory is accessed and which should be executed invisibly, is called:
Responda
  • semaphores
  • mutual exclusion
  • critical section
  • directory

Questão 9

Questão
In memory systems, boundary registers?
Responda
  • track the beginning and ending of programs
  • track page boundaries
  • are only necessary with fixed partitions
  • are used for temporary program variable storage

Questão 10

Questão
The resource vector defines
Responda
  • total amount of resources required for all processes
  • total amount of each resource in the system
  • total amount of each resource allocated to all processes
  • total amount of each resource NOT allocated to any process

Questão 11

Questão
When each process in the set is blocked awaiting for resource seized by another blocked process
Responda
  • it is a deadend
  • it is a deadlock
  • it is a softlock
  • it is a mortallock

Questão 12

Questão
The number of resources requested be a process:
Responda
  • must exceed the total number of resources available in the system
  • must always be equal to the total number of resources available in the system
  • must not exceed the total number of resources available in the system
  • must always be less than the total number of resources available in the system

Questão 13

Questão
What is interprocess communication?
Responda
  • communication between two process
  • communication between two threads of same process
  • none of the above
  • communication within the process

Questão 14

Questão
The degree of multi-programming is:
Responda
  • the number of processes executed per unit time
  • the number of processes in the I/O queue
  • the number of processes in the ready queue
  • the number of processes in memory

Questão 15

Questão
This matrix defines the amount of resources of type j requested by process i
Responda
  • Allocation matrix
  • Resource matrix
  • Request matrix
  • Claim matrix

Questão 16

Questão
To avoid the race condition, the number of processes that may be simultaneously inside their critical section is:
Responda
  • 10
  • 0
  • 1
  • 2

Questão 17

Questão
Which process can be affected by other processes executing in the system?
Responda
  • init process
  • cooperating process
  • child process
  • parent process

Questão 18

Questão
Which of the following registers are used by the processor to exchange data with memory?
Responda
  • MAR and MBR
  • PC and IR
  • Program status word
  • I/OAR and I/OBR

Questão 19

Questão
Which of the following registers are used by the processor to exchange data with input/output module?
Responda
  • MAR and MBR
  • PC and IR
  • Program status word
  • I/OAR and I/OBR

Questão 20

Questão
The main disadvantage of this technique: consumes a lot of processor time, because every word
Responda
  • Direct memory access (DMA)
  • Manual memory access
  • Interrupt-driven I/O
  • Programmed I/O

Questão 21

Questão
The processor issues an I/O command to a module and then go on to some other useful work. The I/O module performs the requested action and alerts the processor to request service when it is ready to exchange data with the processor. The described technique is:
Responda
  • Direct memory access (DMA)
  • Manual memory access
  • Interrupt-driven I/O
  • Programmed I/O

Questão 22

Questão
Which of the following is not a technique possible for I/O operations?
Responda
  • Direct memory access (DMA)
  • Manual memory access
  • Interrupt-driven I/O
  • Programmed I/O

Questão 23

Questão
If a page table entry is not in main memory, then it is known as a:
Responda
  • page fault
  • buffer miss
  • TLB hit
  • TLB miss

Questão 24

Questão
We have 
Ts = average (system) access time
 T1 = access time of M1 (cache) 
T2 = access time of M2 (main memory) 
T3 = access time of M3 (disk) 
H1 = hit ratio, fraction of time reference is found i M1 
H2 = hit ratio, fraction of time reference is found i M2 
The average time to access an item, in case the item in disk is:
Responda
  • Ts = H1*T1 + H2*T2 + (1-H2)*T3
  • Ts = H1*T1 + (1-H1)*(H1*T1 + H2*(T1 + T2) + (1 - H2)*(T2 + T3))
  • Ts = H1*T1 + (1-H1)*H2*(T2 + T3)
  • Ts = H1*T1 + (1-H1)*(H2*(T1 + T2) + (1 - H2)*(T1 + T2 + T3))

Questão 25

Questão
This chooses which block to replace when a new block is to be loaded into the cache and the cache already had all slots filled with other blocks:
Responda
  • replacement algorithm
  • write policy
  • cache size
  • locality of reference

Questão 26

Questão
If the accessed word is found in the faster memory, that is defined as a:
Responda
  • bingo
  • win
  • hit
  • evrika

Questão 27

Questão
If the accessed word is not found in the faster memory, that is defined as a:
Responda
  • ricochet
  • miss
  • zero
  • loss

Questão 28

Questão
The processor contains a single data register, called
Responda
  • PSW
  • PC
  • IR
  • AC

Questão 29

Questão
Which register contains the instruction most recently fetched?
Responda
  • instruction register
  • execution register
  • program counter
  • process counter

Questão 30

Questão
This register specifies the location in memory for the next read or write
Responda
  • Memory address register
  • I/OAR
  • Memory buffer register
  • I/OBR

Questão 31

Questão
Which of the following element of a computer system moves data between the computer and its external environment?
Responda
  • Main memory
  • Processor
  • System bus
  • I/O modules

Questão 32

Questão
This 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
Responda
  • Direct memory access (DMA)
  • Manual memory access
  • Interrupt-driven I/O
  • Programmed I/O

Questão 33

Questão
The 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:
Responda
  • Direct memory access (DMA)
  • Manual memory access
  • Interrupt-driven I/O
  • Programmed I/O

Questão 34

Questão
The 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:
Responda
  • Direct memory access (DMA)
  • Manual memory access
  • Interrupt-driven I/O
  • Programmed I/O

Questão 35

Questão
The processor is executing "Load AC from memory" instruction. Choose the correct micro-instruction:
Responda
  • PC -> MAR M -> MBR MBR -> AC IR -> MAR M -> MBR MBR -> AC
  • PC -> MBR M -> MAR MAR -> IR IR -> MAR M -> MBR MBR -> AC
  • PC -> MAR M -> MBR MBR -> IR IR -> MAR M -> MBR MBR -> AC
  • PC -> MAR M -> MBR MBR -> IR IR -> MBR M -> MAR MAR -> AC

Questão 36

Questão
If there no interrupts, after each write operation, the processor must:
Responda
  • Load new PC value
  • Finish execution of current instruction
  • Save the PSW and PC onto control stack
  • Pause and remain idle until the I/O operation finishes

Questão 37

Questão
Complete the relationship concerning the memory systems: greater capacity
Responda
  • lower capacity
  • greater cost per bit
  • faster access speed
  • smaller cost per bit

Questão 38

Questão
User-visible registers minimize main memory references by optimizing register use
Responda
  • True
  • False

Questão 39

Questão
This register contains the data to be written into memory or which receives the data read from memory
Responda
  • I/OAR
  • memory buffer register
  • memory address register
  • I/OBR

Questão 40

Questão
Which of the following element of a computer system controls the operation of the computer and performs its data processing functions?
Responda
  • System bus
  • Main memory
  • I/O modules
  • Processor

Questão 41

Questão
The main disadvantages of this technique: there is a competition for bus usage
Responda
  • Interrupt-driven I/O
  • Programmed I/O
  • Manual memory access
  • Direct memory access (DMA)

Questão 42

Questão
At the beginning of each instruction cycle, the processor fetches an instruction from the memory. The address of the instruction is held in
Responda
  • IR
  • MBR
  • MAR
  • PC

Questão 43

Questão
The smaller, more expensive, faster memory is:
Responda
  • Disk drive
  • Cache
  • Main memory
  • Register

Questão 44

Questão
There were no OS with
Responda
  • Simple batch systems
  • Serial processing
  • Time-sharing-systems
  • Multiprogrammed batch systems

Questão 45

Questão
The principal objective of the time-sharing system is to
Responda
  • Minimize response time
  • Minimize processor utilization
  • Maximize response time
  • Maximize processor utilization

Questão 46

Questão
Serial processing was used
Responda
  • In early 1960s
  • From late 1940s to the mid-1950s
  • From the mid-1950s to early 1960s

Questão 47

Questão
The programmer interacted directly with the computer hardware with
Responda
  • Simple batch systems
  • Serial processing
  • Time-sharing-systems
  • Multiprogrammed batch systems

Questão 48

Questão
In operation system security and protection, availability is:
Responda
  • Concerned with the proper verification of the identity of users and the validity of messages or data
  • Assuring that users cannot read data for which access is unauthorized
  • Protection of data from unauthorized modification
  • Concerned with protecting the system against interruption

Questão 49

Questão
Choose the storage management responsibility for "The OS can achieve efficiency by assigning memory to jobs only as needed"
Responda
  • Process isolation
  • Protection and access control
  • Long-term storage
  • Support of modular programming
  • Automatic allocation and management

Questão 50

Questão
The limit register
Responda
  • Defines the size of the region of memory occupied by the process (in bytes or words)
  • Contains the index into the process list of the process currently controlling the processor
  • Points to the next instruction in that process to be executed
  • Contains the staring address of the region of memory occupied by the process

Questão 51

Questão
In operating system security and protection, authenticity is:
Responda
  • Concerned with the proper verification of the identity of users and the validity of messages or data
  • Assuring that users cannot read data for which access is unauthorized
  • Protection of data from unauthorized modification
  • Concerned with protecting the system against interruption

Questão 52

Questão
An application programs is developed by the
Responda
  • Application programmer
  • End user
  • Operating system
  • Hardware

Questão 53

Questão
"The OS as a User/Computer interface" corresponds to the following objective
Responda
  • Efficiency
  • Convenience
  • Ability to evolve

Questão 54

Questão
Process is
Responda
  • Program in High level language kept on disk
  • Contents of main memory
  • A job in secondary memory
  • A program in execution

Questão 55

Questão
If a process is executing in its critical section, then no other processes can be executing in their critical section. This condition is called
Responda
  • Synchronous exclusion
  • Critical exclusion
  • Asynchronous exclusion
  • Mutual exclusion

Questão 56

Questão
In operating system security and protection, confidentiality is:
Responda
  • Concerned with the proper verification of the identity of users and the validity of messages or data
  • Assuring that users cannot read data for which access is unauthorized
  • Protection of data from unauthorized modification
  • Concerned with protecting the system against interruption

Questão 57

Questão
In operating system security and protection, Data integrity is:
Responda
  • Concerned with the proper verification of the identity of users and the validity of messages or data
  • Assuring that users cannot read data for which access is unauthorized
  • Protection of data from unauthorized modification
  • Concerned with protecting the system against interruption

Questão 58

Questão
When the time required for the I/O operation is less that the time to complete the execution of instructions between write operations in the user program, it is:
Responda
  • Fast I/O wait
  • Slow I/O wait
  • Long I/O wait
  • Short I/O wait

Questão 59

Questão
This type of memory is nonvolatile:
Responda
  • Register
  • Secondary memory
  • Cache
  • Main memory

Questão 60

Questão
If the contents of a block in the cache are altered, then it is needed to save it back to main memory before replacing it. This is called:
Responda
  • write policy
  • mapping function
  • locality of reference
  • replacement algorithm

Questão 61

Questão
What is not a structural element of a computer system?
Responda
  • System bus
  • Main memory
  • Operating system
  • Processor

Questão 62

Questão
The main disadvantage of this technique: it is a time-consuming process that keeps the processor busy needlessly
Responda
  • Direct memory access (DMA)
  • Manual memory access
  • Interrupt-driven I/O
  • Programmed I/O

Questão 63

Questão
Which of the following element of a computer system stores data and programs
Responda
  • Main memory
  • System bus
  • Processor
  • I/O modules

Questão 64

Questão
When an I/O device completes an I/O operation, the device issues an interrupt signal to the processor and then:
Responda
  • The processor stops execution of the current instruction without finishing it and responds to the interrupt
  • The processor loads the program counter with the entry location of the interrupt-handling routine
  • The processor saves information needed to resume the current program at the point if interrupt
  • The processor finishes execution of the current instruction before responding to the interrupt

Questão 65

Questão
Complete the relationship concerning the memory systems: greater capacity
Responda
  • lower capacity
  • slower access speed
  • greater cost per bit
  • faster access speed

Questão 66

Questão
Which register contains condition codes set by the processor hardware as the result of operations?
Responda
  • Program counter
  • Accumulator
  • Program status word
  • Stack pointer

Questão 67

Questão
Which of the following provides for communication among elements of a computer system?
Responda
  • main memory
  • system bus
  • processor
  • I/O modules

Questão 68

Questão
We have Ts = average (system) access time
 T1 = access time of M1 (cache)
 T2 = access time of M2 (main memory)
 T3 = access time of M3 (disk)
 H1 = hit ratio, fraction of time reference is found i M1
 H2 = hit ratio, fraction of time reference is found i M2
 The average time to access an item, in case the item in main memory is:
Responda
  • Ts = H1*T1 + H2*T2 + (1-H2)*T3
  • Ts = H1*T1 + (1-H1)*(H1*T1 + H2*(T1 + T2) + (1 - H2)*(T2 + T3))
  • Ts = H1*T1 + (1-H1)*(T1+T2)
  • Ts = H1*T1 + (1-H1)*(H2*(T1 + T2) + (1 - H2)*(T1 + T2 + T3))

Questão 69

Questão
Control and status registers control the operation of the processor and the execution of programs
Responda
  • True
  • False

Questão 70

Questão
This type of system was developed at MIT by a group known as Project MAC for the IBM 709 in 1961
Responda
  • Serial processing
  • Multiprogrammed batch system
  • Simple batch system
  • Time-sharing-system

Questão 71

Questão
The concept of codes of operation (user mode, system mode) was introduced with
Responda
  • Time-sharing-system
  • Simple batch system
  • Multiprogrammed batch system
  • Serial processing

Questão 72

Questão
Short-term scheduler, or dispatcher, picks a process. Each process in the queue is given some time in turn. This strategy is called:
Responda
  • Round-robin technique
  • Prioritizing
  • Carousel technique
  • Merry-go-round technique

Questão 73

Questão
Central idea in this system was the use of piece of software known as the monitor:
Responda
  • Time-sharing-system
  • Simple batch system
  • Multiprogrammed batch system
  • Serial processing

Questão 74

Questão
'More than one program attempts to make use of a shared resource at the same time'. This is
Responda
  • Failed mutual exclusion
  • Improper synchronization
  • Deadlocks
  • Nondeterminate program operation

Questão 75

Questão
The term was first used by the designers of Multics in 1960s:
Responda
  • Monitor
  • Process
  • Multiprogramming
  • Time sharing

Questão 76

Questão
Utilities are
Responda
  • Application program
  • System programs
  • Opcodes
  • Processor registers

Questão 77

Questão
"When program shares memory and their execution is interleaved by the processor, they may interfere with each other by overwriting common memory areas in unpredictable ways. The result of a particular program depend on the activities of other programs in shared systems". This is:
Responda
  • Falled mutual exclusions
  • Deadlocks
  • Nondeterminate program operation
  • Improper synchronisation

Questão 78

Questão
The state of a processor is defined by:
Responda
  • the activity just executed by the process
  • the current activity of the process
  • the final activity of the process
  • the activity to next be executed by the process

Questão 79

Questão
The hardware and software used in providing applications to a user can be viewed in:
Responda
  • classified fashion
  • layered fashion
  • sandwich fashion
  • leveled fashion

Questão 80

Questão
Suppose that a process is in "Blocked" state waiting for some I/O device. When the service is completed, it goes to the:
Responda
  • Suspended state
  • Terminated state
  • Ready state
  • Running state

Questão 81

Questão
We have Ts = average (system) access time T1 = access time of M1 (cache)
 T2 = access time of M2 (main memory) T3 = access time of M3 (disk)
 H1 = hit ratio, fraction of time reference is found i M1
 H2 = hit ratio, fraction of time reference is found i M2
 The average time to access an item, in case the item in cache is:
Responda
  • Ts = H1*T1 + H2*T2 + (1-H2)*T3
  • Ts = H1*T1 + (1-H1)*(H1*T1 + H2*(T1 + T2) + (1 - H2)*(T2 + T3))
  • Ts = H1*T1
  • Ts = H1*T1 + (1-H1)*(H2*(T1 + T2) + (1 - H2)*(T1 + T2 + T3))

Questão 82

Questão
The serial processing presented two main problems:
Responda
  • setup time
  • using a monitor
  • time slicing
  • multiprogramming
  • scheduling

Questão 83

Questão
The process index register:
Responda
  • contains the index into a process list of the process currently controlling the processor
  • define the region in memory occupied by the process
  • points to the next instruction in that process to be executed
  • contains the starting address of the region of memory occupied by the process

Questão 84

Questão
The concept of a batch operating system was developed to
Responda
  • Maximize processor utilization
  • Minimize response time
  • Support interactive mode
  • Minimize processor utilization

Questão 85

Questão
Batch operating system were used
Responda
  • From the late 1940s to the mid-1950s
  • From the mid-1950 to early 1960s
  • In early 1960s

Questão 86

Questão
"More than one programs hung up waiting for each other". This is
Responda
  • Failed mutual exclusions
  • Deadlocks
  • Nondeterminate program operation
  • Improper synchronization

Questão 87

Questão
This contains the most frequently used functions in the OS:
Responda
  • Centre
  • Base
  • Root
  • Kernel

Questão 88

Questão
The end user views a computer system in terms of:
Responda
  • a set of machine instructions
  • utilities
  • a set of system programs
  • a set of applications

Questão 89

Questão
Which of the following is not the state of a process?
Responda
  • new
  • waiting
  • terminated
  • ready
  • running
  • old

Questão 90

Questão
The fetched instruction is loaded into the
Responda
  • IR
  • Accumulator
  • Memory
  • PC

Questão 91

Questão
When the time required for the I/O operation will take much more time than executing a sequence of user instructions, it is:
Responda
  • Slow I/O wait
  • Long I/O wait
  • Fast I/O wait
  • Short I/O wait

Questão 92

Questão
The system handles multiple interactive jobs
Responda
  • Time-sharing-system
  • Simple batch system
  • Serial processing
  • Multiprogrammed batch system

Questão 93

Questão
A system clock generates interrupts at a rate of approximately one every 0.2 seconds. At each clock interrupt, the OS regained control and could assign the processor to another user. This technique is known as
Responda
  • Time scheduling
  • Time sliding
  • Time slicing
  • Time allocating

Questão 94

Questão
Choose the storage management responsibility for "Programmers should be able to define programs modules, and to create, destroy, and alter the size of modules dynamically":
Responda
  • Protection and access control
  • Long-term storage
  • automatic allocation and management
  • process isolation
  • support of modular programming

Questão 95

Questão
'Lost signals, duplicate signals received'. This is
Responda
  • Improper synchronization
  • Nondeterminate program operation
  • Deadlocks
  • Failed mutual exclusion

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