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Question 1 of 60 Quiz ID: q1

Which of the following is NOT mentioned as a major component of operating system design and operation?

I/O management

Process scheduling

Memory management

Performance management

Question 2 of 60 Quiz ID: q2

What is the primary function of device drivers in an I/O system?

To increase the speed of I/O operations

To encapsulate device details and present uniform device-access interface

To manage memory allocation for devices

To handle network communications

Question 3 of 60 Quiz ID: q3

In I/O hardware terminology, what is a port?

A network communication endpoint

A connection point for device

A type of bus architecture

A memory storage location

Question 4 of 60 Quiz ID: q4

Which bus type is mentioned as common in PCs and servers?

ISA bus

PCI bus

AGP bus

EISA bus

Question 5 of 60 Quiz ID: q5

What is Serial-attached SCSI (SAS) commonly used for?

Network interfaces

Graphics cards

Disk interface

Memory modules

Question 6 of 60 Quiz ID: q6

A controller (host adapter) contains all of the following EXCEPT:

Processor

Microcode

Private memory

Power supply unit

Question 7 of 60 Quiz ID: q7

What is Fibre Channel (FC) described as?

A simple cable connection

A complex controller, usually separate circuit board

A type of memory interface

A wireless communication protocol

Question 8 of 60 Quiz ID: q8

Which of the following is NOT typically found in device registers?

Data-in register

Status register

Control register

Cache register

Question 9 of 60 Quiz ID: q9

How many bytes do device registers typically contain?

1-4 bytes

8-16 bytes

32-64 bytes

128-256 bytes

Question 10 of 60 Quiz ID: q10

In memory-mapped I/O, device data and command registers are:

Stored in separate memory chips

Mapped to processor address space

Handled only by the CPU

Isolated from the main system

Question 11 of 60 Quiz ID: q11

What is the first step in the polling process for each byte of I/O?

Host sets command-ready bit

Read busy bit from status register until 0

Controller sets busy bit

Host copies data into data-out register

Question 12 of 60 Quiz ID: q12

What is the main disadvantage of polling when the device is slow?

It increases power consumption

It is inefficient due to busy-wait cycle

It causes data corruption

It requires special hardware

Question 13 of 60 Quiz ID: q13

How many instruction cycles can polling happen in?

1 cycle

2 cycles

3 cycles

4 cycles

Question 14 of 60 Quiz ID: q14

What triggers the CPU interrupt-request line?

Memory allocation

Process scheduling

I/O device

System timer only

Question 15 of 60 Quiz ID: q15

What is the purpose of an interrupt vector?

To store interrupt data

To dispatch interrupt to correct handler

To count the number of interrupts

To prevent interrupts from occurring

Question 16 of 60 Quiz ID: q16

Which type of interrupts cannot be ignored or delayed?

Maskable interrupts

Nonmaskable interrupts

Timer interrupts

Software interrupts

Question 17 of 60 Quiz ID: q17

What happens when more than one device shares the same interrupt number?

System crash occurs

Interrupt chaining is used

Only the first device works

Interrupts are disabled

Question 18 of 60 Quiz ID: q18

Besides I/O operations, the interrupt mechanism is also used for:

Memory allocation only

Process creation only

Exceptions and system calls

File system operations only

Question 19 of 60 Quiz ID: q19

According to the lecture, how many interrupts did a quiet macOS desktop generate over 10 seconds?

2,300 interrupts

23,000 interrupts

230,000 interrupts

2,300,000 interrupts

Question 20 of 60 Quiz ID: q20

What is the main purpose of Direct Memory Access (DMA)?

To increase CPU speed

To avoid programmed I/O for large data movement

To reduce memory usage

To improve graphics performance

Question 21 of 60 Quiz ID: q21

What does DMA require to function?

Additional CPU cores

DMA controller

Extra memory modules

Special operating system

Question 22 of 60 Quiz ID: q22

In DMA operation, what information does the OS write into the DMA command block?

Only source address

Only destination address

Source and destination addresses, read/write mode, and count of bytes

Only the count of bytes

Question 23 of 60 Quiz ID: q23

What is 'cycle stealing' in the context of DMA?

DMA controller grabs bus from CPU

CPU steals cycles from DMA

Memory cycles are lost

Bus cycles are duplicated

Question 24 of 60 Quiz ID: q24

What is DVMA?

Direct Virtual Memory Access

Dual Virtual Memory Architecture

Dynamic Virtual Memory Allocation

Distributed Virtual Memory Access

Question 25 of 60 Quiz ID: q25

What is the main function of the device-driver layer?

To increase device speed

To hide differences among I/O controllers from kernel

To manage device power consumption

To provide network connectivity

Question 26 of 60 Quiz ID: q26

Which of the following is NOT mentioned as a dimension in which devices vary?

Character-stream or block

Sequential or random-access

Wired or wireless

Synchronous or asynchronous

Question 27 of 60 Quiz ID: q27

How are I/O devices broadly grouped by the OS according to the lecture?

Fast, medium, and slow devices

Block I/O, Character I/O, Memory-mapped file access, Network sockets

Input, output, and bidirectional devices

Local, remote, and virtual devices

Question 28 of 60 Quiz ID: q28

What is the purpose of Unix ioctl() call?

To manage file permissions

To send arbitrary bits to a device control register and data to device data register

To create new processes

To allocate memory

Question 29 of 60 Quiz ID: q29

In UNIX and Linux, what is used to identify type and instance of devices?

Device names only

IP addresses

Tuple of 'major' and 'minor' device numbers

File permissions

Question 30 of 60 Quiz ID: q30

Which of the following commands is associated with block devices?

get(), put()

send(), receive()

read, write, seek

connect(), disconnect()

Question 31 of 60 Quiz ID: q31

What type of access is possible with block devices through memory-mapped files?

File mapped to virtual memory with clusters brought via demand paging

Direct hardware access only

Network-based access only

Sequential access only

Question 32 of 60 Quiz ID: q32

Character devices include all of the following EXCEPT:

Keyboards

Mice

Serial ports

Disk drives

Question 33 of 60 Quiz ID: q33

Why do network devices have their own interface separate from block and character devices?

They are faster than other devices

They vary enough from block and character devices

They require special drivers

They use different power requirements

Question 34 of 60 Quiz ID: q34

What functionality does the socket interface include?

Only network protocol management

Only network operation management

select() functionality and separation of network protocol from network operation

Only data encryption

Question 35 of 60 Quiz ID: q35

What is the normal resolution for clocks and timers mentioned in the lecture?

1/30 second

1/60 second

1/100 second

1/120 second

Question 36 of 60 Quiz ID: q36

In blocking I/O, what happens to the process?

Process continues running normally

Process is suspended until I/O completed

Process is terminated

Process creates a new thread

Question 37 of 60 Quiz ID: q37

What does nonblocking I/O return?

Nothing

Error code only

As much data as available

Complete data set only

Question 38 of 60 Quiz ID: q38

What is the main characteristic of asynchronous I/O?

Process waits for I/O completion

Process runs while I/O executes

I/O operations are queued

Multiple processes share I/O

Question 39 of 60 Quiz ID: q39

What does vectored I/O allow?

One system call to perform multiple I/O operations

Multiple processes to share one device

Automatic error recovery

Network load balancing

Question 40 of 60 Quiz ID: q40

What is an example of a vectored I/O system call in Unix?

read()

write()

readve()

select()

Question 41 of 60 Quiz ID: q41

What is the primary purpose of buffering in the kernel I/O subsystem?

To increase storage capacity

To store data in memory while transferring between devices

To encrypt data transfers

To compress data

Question 42 of 60 Quiz ID: q42

What is double buffering?

Using two different devices

Two copies of the data (kernel and user)

Backing up data twice

Using two processors

Question 43 of 60 Quiz ID: q43

What is the key difference between caching and buffering?

Caching is faster device holding copy of data, always just a copy

Buffering is permanent, caching is temporary

Caching uses more memory than buffering

There is no difference

Question 44 of 60 Quiz ID: q44

What is spooling used for?

Network communication

Memory management

Hold output for a device that can serve only one request at a time

Process scheduling

Question 45 of 60 Quiz ID: q45

What is the purpose of device reservation?

To improve performance

To provide exclusive access to a device

To save power

To reduce errors

Question 46 of 60 Quiz ID: q46

Which systems are mentioned as being more advanced in error handling?

Windows and Linux

Solaris FMA and AIX

macOS and FreeBSD

Android and iOS

Question 47 of 60 Quiz ID: q47

Why are all I/O instructions defined to be privileged?

To improve performance

To prevent user process from accidentally or purposefully disrupting normal operation

To save memory

To reduce complexity

Question 48 of 60 Quiz ID: q48

How must I/O be performed in protected systems?

Directly by user processes

Via system calls

Through hardware interrupts only

Using special user privileges

Question 49 of 60 Quiz ID: q49

What type of method does Windows use for I/O implementation?

Direct hardware access

Polling only

Message passing

Shared memory

Question 50 of 60 Quiz ID: q50

In mobile computing, power management is treated as:

A secondary concern

An optional feature

First class OS aspect

Hardware-only responsibility

Question 51 of 60 Quiz ID: q51

What does Android's component-level power management understand?

Only individual component power usage

Relationship between components

Network power consumption only

User behavior patterns only

Question 52 of 60 Quiz ID: q52

What are wake locks in Android?

Security mechanisms

Memory protection features

Locks that prevent sleep of device when held

Network synchronization tools

Question 53 of 60 Quiz ID: q53

What is power collapse in Android?

System shutdown

Battery failure

Put a device into very deep sleep with marginal power use

Power supply malfunction

Question 54 of 60 Quiz ID: q54

What does ACPI stand for?

Advanced Configuration and Power Interface

Automatic Computer Power Integration

Advanced Component Power Instructions

Application Control Power Interface

Question 55 of 60 Quiz ID: q55

Which of the following is NOT mentioned as a service coordinated by the I/O subsystem?

Management of the name space for files and devices

Device allocation

Automatic software updates

I/O scheduling

Question 56 of 60 Quiz ID: q56

In the STREAMS architecture, what interfaces with the user process?

Driver end

STREAM head

STREAM modules

Message queues

Question 57 of 60 Quiz ID: q57

What type of communication does STREAMS provide?

Simplex communication

Half-duplex communication

Full-duplex communication

Broadcast communication

Question 58 of 60 Quiz ID: q58

How do STREAM modules communicate with each other?

Direct function calls

Shared memory

Message passing between queues

Signal handling

Question 59 of 60 Quiz ID: q59

Which of the following is NOT mentioned as a way to improve I/O performance?

Reduce number of context switches

Use DMA

Increase CPU clock speed

Reduce data copying

Question 60 of 60 Quiz ID: q60

What makes network traffic especially stressful for I/O performance?

High bandwidth requirements

Complex protocols only

Multiple factors: CPU demands, context switches, data copying

Security overhead only

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