What does the client/server model simplify in operating systems?

Communication between applications and services

What is the primary function of an operating system (OS)?

Act as an interface between hardware and the user

What happens during the fetch phase of the instruction cycle?

Instruction is loaded into the IR

What is the function of the system bus in a computer system?

Facilitate communication among processors, main memory, and I/O modules

What is the role of the Process Control Block (PCB)?

Stores process information to manage execution

Which of the following best describes the 'instruction cycle'?

A continuous cycle of fetching and executing instructions

Which of the following describes a time-sharing operating system?

Shares processor time among multiple users simultaneously

Which of the following is a characteristic of multiprogrammed batch systems?

Can hold and execute multiple programs concurrently

What is the main difference between a blocked process and a blocked/suspend process?

Blocked process waits in main memory; blocked/suspend in secondary memory

Which instruction is used for atomic mutual exclusion in hardware?

Test-and-Set (TAS), Compare-and-Swap (CAS)

What information does the program counter hold?

Address of the next instruction to execute

Which type of thread management does Solaris use?

Combined approach of user-level and kernel-level threads

Which of the following is NOT an advantage of kernel-level threads (KLTs)?

Requires a mode switch to the kernel

What is the main purpose of thread synchronization?

To ensure safe access to shared resources

In a race condition, the final result depends on:

The order of execution of processes

In inter-process communication, what is a mailbox?

A shared memory location for exchanging messages

What is a thread in the context of an operating system?

A lightweight process for dispatching execution

What interface is closest to the user in a computer system?

Application Programming Interface (API)

What is the function of the dispatcher in process management?

Switches CPU control between processes

What is the purpose of process suspension?

To temporarily remove processes from main memory

What is swapping in the context of process management?

Moving processes between main memory and secondary memory

What is the main objective of an operating system (choose most appropriate)?

To make the computer more convenient to use and efficient

What does a thread pool do in Windows OS?

Executes asynchronous tasks efficiently

What is contained in the Processor State Information?

Contents of registers and status flags

What is the role of a dispatcher in thread management?

Switches CPU control between threads

What is the purpose of virtual memory in an operating system?

To use secondary memory as if it were main memory

What is the purpose of semaphores in operating systems?

Ensure mutual exclusion and prevent race conditions

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Operating Systems Midterm Review

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Questions 96

Answers

1
What does the client/server model simplify in operating systems?
Disk defragmentation
Video processing
Communication between applications and services
Hardware manufacturing
2
What is the primary function of an operating system (OS)?
Perform arithmetic operations
Act as an interface between hardware and the user
Manage application software only
Control network connections
3
What happens during the fetch phase of the instruction cycle?
Data is written to memory
Instruction is loaded into the IR
Instruction is executed
Processor interprets the instruction
4
What is the function of the system bus in a computer system?
Execute software applications
Manage power supply
Control system security
Facilitate communication among processors, main memory, and I/O modules
5
Which of the following is NOT a component of a process?
Associated data (variables, buffers)
Executable program
Execution context
User password
6
What is the role of the Process Control Block (PCB)?
Controls access to files
Stores process information to manage execution
Manages memory allocation
Handles user inputs
7
Which of the following best describes the 'instruction cycle'?
A continuous cycle of fetching and executing instructions
An algorithm for sorting data
Storing data in memory permanently
A process of transferring files between devices
8
Which of the following describes a time-sharing operating system?
Allows only one user at a time
Shares processor time among multiple users simultaneously
Executes only batch jobs
Processes jobs sequentially without user interaction
9
Which type of thread management is performed by the kernel?
Kernel-level thread (KLT)
User-level thread (ULT)
Virtual thread
Application-level thread
10
Which of the following is a characteristic of multiprogrammed batch systems?
Executes one job at a time
Requires no operating system
Can hold and execute multiple programs concurrently
Does not use I/O devices
11
Which of these is considered a major achievement in operating systems?
Game development
File compression
Memory management
Graphic design
12
What is the main difference between a blocked process and a blocked/suspend process?
Blocked processes are ready for execution
Blocked/suspend processes are permanently terminated
Blocked process waits in main memory; blocked/suspend in secondary memory
Both wait in main memory but for different events
13
Which design approach helps in extending an operating system modularly?
Object-Oriented Design
Linear Programming
Heuristic Analysis
Database Normalization
14
Which of the following is NOT a characteristic of the memory hierarchy?
Increasing cost per bit
Increasing access time
Decreasing cost per bit
Increasing capacity
15
Which instruction is used for atomic mutual exclusion in hardware?
Load-and-Set
Test-and-Set (TAS)
Compare-and-Swap (CAS)
Load-and-Store
16
Which type of memory is referred to as non-volatile?
Secondary Memory
Register Memory
Cache Memory
Main Memory
17
What information does the program counter hold?
Size of main memory
Status of I/O devices
Address of the next instruction to execute
Current process priority
18
Which of these is NOT a component of a thread's context?
Program code
Execution stack
Saved register set
Thread ID
19
Which type of thread management does Solaris use?
Kernel-level threads only
Fiber-based threading
Combined approach of user-level and kernel-level threads
User-level threads only
20
Which of the following is NOT an advantage of kernel-level threads (KLTs)?
Kernel routines can be multithreaded
Can schedule multiple threads on multiple processors
Requires a mode switch to the kernel
Thread blocking does not block the entire process
21
What does a stack in a process image store?
Executable code
Procedure call information
Disk management data
User credentials
22
Android OS is based on which kernel?
Linux
Windows NT
Unix
macOS
23
What is the main purpose of thread synchronization?
To improve thread execution speed
To terminate threads efficiently
To allocate memory dynamically
To ensure safe access to shared resources
24
In a race condition, the final result depends on:
The type of file system used
The operating system version
The memory allocation technique
The order of execution of processes
25
During the instruction cycle, where is the fetched instruction loaded?
Program Counter (PC)
Instruction Register (IR)
Cache Memory
Main Memory
26
Which of the following is a possible state of a process?
Saving
Compiling
Debugging
Running
27
In inter-process communication, what is a mailbox?
A network protocol
A semaphore operation
A disk scheduling algorithm
A shared memory location for exchanging messages
28
In a two-state process model, what are the two states?
Blocked and Suspended
Waiting and Terminated
New and Terminated
Ready and Running
29
What is a thread in the context of an operating system?
A file management component
A unit of resource ownership
A network protocol
A lightweight process for dispatching execution
30
Which of the following is NOT a technique to achieve concurrency?
Multitasking
Multithreading
Multiprocessing
Single-thread execution
31
What interface is closest to the user in a computer system?
Application Programming Interface (API)
Hardware Interface
Instruction Set Architecture (ISA)
Application Binary Interface (ABI)
32
What is the function of the dispatcher in process management?
Switches CPU control between processes
Allocates memory to processes
Manages file access
Swaps processes between memory and disk
33
What is the purpose of process suspension?
To update process information
To temporarily remove processes from main memory
To execute processes faster
To delete unnecessary processes
34
What is swapping in the context of process management?
Terminating inactive processes
Moving processes between main memory and secondary memory
Allocating memory to processes
Scheduling processes for execution
35
Which of the following is NOT a basic hardware element of a computer system?
System Bus
Main Memory
Operating System
Processor
36
What type of memory is referred to as 'volatile'?
Cache Memory
Main Memory
ROM
Secondary Memory
37
What is the main objective of an operating system (choose most appropriate)?
To make the computer more convenient to use and efficient
To manage network security
To execute only system software
To perform hardware repairs
38
What does a thread pool do in Windows OS?
Allocates memory to applications
Executes asynchronous tasks efficiently
Manages network connections
Handles disk I/O operations exclusively
39
The earliest computers used which type of processing?
Serial Processing
Multiprogramming
Time-sharing
Real-time processing
40
Which type of information is NOT stored in I/O tables?
Network configurations
Memory locations for I/O transfers
Status of I/O devices
Progress of I/O operations
41
In a five-state process model, which state is characterized by waiting for an event?
Blocked
Ready
New
Running
42
What is contained in the Processor State Information?
File management data
Network protocols
Contents of registers and status flags
User passwords
43
Which operation on a semaphore decreases its value?
Wait (acquire)
Release
Post (signal)
Reset
44
Which of the following is NOT a reason for process termination?
User input
Lack of memory
Completion of execution
Error in execution
45
Which of the following is NOT an advantage of symmetric multiprocessing (SMP)?
Single-user limitation
Incremental growth
Availability and fault tolerance
Performance improvement
46
What is the role of a dispatcher in thread management?
Controls network protocols
Switches CPU control between threads
Allocates memory to threads
Manages I/O operations
47
Which of the following is a type of thread?
Network thread
Database thread
User-level thread (ULT)
Virtual thread
48
What is the purpose of virtual memory in an operating system?
To manage files efficiently
To increase processing speed
To enhance network security
To use secondary memory as if it were main memory
49
In the context of semaphores, what does a zero value indicate?
Resource is not available
Resource is available
Resource is locked permanently
Resource is corrupted
50
What is the purpose of semaphores in operating systems?
Ensure mutual exclusion and prevent race conditions
Handle network protocols
Optimize memory allocation
Manage file systems
51
The main memory is also referred to as:
External memory
Cache memory
Real memory or primary memory
Secondary memory
52
Which component of the computer system performs data processing functions?
Main Memory
I/O Modules
System Bus
Processor
53
Which of these is the principal storage management responsibility of an OS?
Power management
Allocation of memory to save data
Audio processing
Network routing
54
What does the program counter (PC) hold during instruction execution?
Address of the previous instruction
Data to be processed
Address of the next instruction to be fetched
Results of executed instructions
55
Which of the following is a characteristic of a suspended process?
Ready for execution immediately
Awaiting an event in main memory
Temporarily stored in secondary memory
Terminated permanently
56
What is multithreading in an operating system?
Executing multiple processes sequentially
Sharing memory between different computers
Executing only one thread per process
Dividing a process into multiple threads that can run concurrently
57
What is a process in the context of an operating system?
A hardware component
A networking protocol
A program in execution
A file stored on disk
58
What is the primary goal of information protection in an operating system?
Execute programs faster
Prevent unauthorized access to data
Enhance graphical user interfaces
Improve network bandwidth
59
In a multithreaded process, what is shared among threads?
Address space and resources
Stack
Program counter
Register set
60
What is the main disadvantage of kernel-level threads (KLTs)?
Requires mode switch to the kernel
Slow context switching
Lack of resource sharing
Need user-level scheduling
61
Which of the following is a key problem in concurrency?
Network latency
Race condition
Memory defragmentation
File fragmentation
62
Which of the following is included in a process's accounting information?
Network addresses
User interface details
CPU usage time
File permissions
63
Which of the following is NOT a service provided by an operating system?
Hardware manufacturing
Program execution
System access
Error detection and response
64
Which architecture assigns only essential functions to the kernel?
Layered Architecture
Monolithic Architecture
Microkernel Architecture
Hybrid Architecture
65
In message passing, which operation makes the sender wait until the message is received?
Async send
Blocking send
Nonblocking receive
Nonblocking send
66
What is the role of I/O modules in a computer system?
Store data temporarily
Manage system memory
Execute instructions
Move data between the computer and its external environment
67
What is an example of a single-threaded operating system?
Windows 10
Android
MS-DOS
Linux
68
What principle does cache memory exploit to enhance performance?
Virtualization
swap data to/from main memory
Parallel processing
Redundancy
69
What is the purpose of interrupts in a computer system?
Synchronize system clocks
Speed up the processor
Breaking the continuous flow of execution
Store data permanently
70
What is NOT an execution state of a thread?
Ready
Compiling
Running
Terminated
71
What is a disadvantage of user-level threads (ULTs)?
Blocking system calls block all threads in the process
Require kernel mode for thread switching
Cannot run on any operating system
Need complex synchronization mechanisms
72
What does the term 'process spawning' refer to?
Terminating a process
Creating a new process at the request of an existing one
Merging two processes
Suspending a process
73
Which of the following best describes multithreading?
Supporting multiple concurrent paths of execution within a single process
Managing hardware resources exclusively
Running a single process without interruption
Executing multiple processes sequentially
74
What is the primary purpose of Dekker's Algorithm?
Memory allocation
Network security
Achieving mutual exclusion between two processes
File management
75
In a computer system, which bus is responsible for transferring data?
Data Bus
Address Bus
Power Bus
Control Bus
76
In a simple batch system, what mode allows execution of privileged instructions?
User Mode
Kernel Mode
Supervisor Mode
Admin Mode
77
Which of the following is NOT an element of a process?
Program code
Associated data
Process state
Network address
78
How are user-level threads managed in an OS?
By hardware controllers
By the kernel directly
By the application with no kernel awareness
By network protocols
79
Which of the following is true about microprocessors?
Only used for rendering graphics
Slowest general-purpose processors
Used exclusively for data storage
Contains multiple processors on a single chip
80
Which of the following is a benefit of threads?
Faster context switching than processes
Higher memory usage
Longer time to create and terminate
Increased process isolation
81
In Android OS, which component is NOT a part of the application architecture?
Services
Content providers
Schedulers
Activities
82
Which of the following is a requirement for mutual exclusion mechanisms?
Fixed number of processes
Allowing multiple processes in critical section
No assumptions about process speeds
Infinite waiting time
83
Which of the following is a function of the control unit within the CPU?
Manage I/O devices
Store data temporarily
Perform arithmetic operations
Interpret and execute instructions
84
GPUs are primarily used for:
Data encryption
Efficient computation on arrays of data using SIMD techniques
Operating system management
Network management
85
What is the primary disadvantage of disabling interrupts for mutual exclusion?
Increases network latency
Works only in multiprocessor systems
Degrades efficiency by limiting interleaving of processes
Requires high memory usage
86
What is the main disadvantage of secondary memory compared to main memory?
Higher cost per bit
Limited storage capacity
Slower access time
Volatility
87
In the readers-writers problem, what condition must be ensured?
Only one writer can access the shared data at a time
Readers can read during writing
Multiple writers can write simultaneously
Writers must wait for readers to finish reading
88
What is a fiber in Windows OS?
A user-level thread managed by the kernel
A kernel-level thread
A unit of execution manually scheduled by the application
A network protocol
89
In which mode does the kernel of an operating system execute?
Control Mode (Kernel Mode)
Debug Mode
Admin Mode
User Mode
90
What is the main purpose of memory tables in an operating system?
Track allocation of main and secondary memory
Store user data permanently
Handle user input and output
Manage CPU scheduling
91
Which of the following problems can occur if mutual exclusion is not enforced?
Buffer overflow
Deadlock
Inconsistent data
Starvation
92
What is the process in the context of an operating system?
A hardware component
An instance of a program in execution
A network protocol
A static program stored on disk
93
What is mutual exclusion?
Ensuring only one process accesses a shared resource at a time
Scheduling processes based on priority
Preventing any process from accessing shared resources
Allowing all processes simultaneous access to shared resources
94
Which algorithm uses a turn variable to ensure mutual exclusion?
Peterson’s Algorithm
Round-robin Scheduling
Dekker’s Algorithm
Banker’s Algorithm
95
Which function does the operating system perform as a resource manager?
Designing hardware
Developing network protocols
Creating software applications
Managing I/O devices and processor time
96
What is the main advantage of multithreading in a single-user system?
Enhanced file system management
Reduced memory usage
Improved modular program structure
Slower execution speed

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