Name: Central Processing Unit
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Author: airdrop_crypto_a8053de295

Apologies for the confusion! Here are 50 multiple-choice questions with their solutions based on the content provided:

MCQs with Solutions:

Which of the following is NOT a peripheral device?

a) Keyboard

b) Monitor

c) CPU

d) Printer

Answer: c) CPU
What does ASCII stand for?

a) American Standard Code for Instructional Interface

b) American Standard Code for Information Interchange

c) Automatic System Code for Internal Interaction

d) Advanced Standard Communication Interchange

Answer: b) American Standard Code for Information Interchange
How many bits are used to represent ASCII characters?

a) 8

b) 7

c) 6

d) 5

Answer: b) 7
What is a peripheral device directly controlled by the computer called?

a) Online device

b) Offline device

c) Isolated device

d) Standalone device

Answer: a) Online device
Which of the following is an example of an input device?

a) Printer

b) Light pen

c) CRT monitor

d) Plotter

Answer: b) Light pen
In memory-mapped I/O, memory and I/O addresses are:

a) Separate

b) Shared in the same address space

c) Mapped to different buses

d) Not used together

Answer: b) Shared in the same address space
Which input device uses optical technology to read barcodes?

a) Magnetic stripe reader

b) Barcode reader

c) Touch screen

d) Mouse

Answer: b) Barcode reader
Which type of interrupt assigns a unique priority to each device?

a) Polling

b) Daisy-chaining

c) Parallel priority

d) Serial priority

Answer: c) Parallel priority
What is the term for transferring a large block of data between memory and I/O devices without involving the CPU?

a) Programmed I/O

b) Interrupt-driven I/O

c) Direct Memory Access (DMA)

d) Cycle stealing

Answer: c) Direct Memory Access (DMA)
In which mode does the CPU continuously check the I/O device status to transfer data?

a) DMA

b) Interrupt-initiated I/O

c) Programmed I/O

d) Burst transfer

Answer: c) Programmed I/O
Which of the following provides hard copy output?

a) CRT monitor

b) Laser printer

c) Barcode reader

d) Mouse

Answer: b) Laser printer
Which input device reads magnetic stripes on cards?

a) Optical mark reader

b) Magnetic stripe reader

c) Barcode reader

d) Touch screen

Answer: b) Magnetic stripe reader
What is the typical function of an input-output interface?

a) Transfer data between CPU and memory

b) Transfer data between CPU and external devices

c) Store data in the CPU

d) Execute programs

Answer: b) Transfer data between CPU and external devices
Which method is used to handle asynchronous data transfer between CPU and peripheral devices?

a) Programmed I/O

b) Handshaking

c) Burst mode

d) Interrupt-driven I/O

Answer: b) Handshaking
The I/O device that prints text and graphics on paper is a:

a) Monitor

b) Printer

c) Plotter

d) Light pen

Answer: b) Printer
Which character encoding standard uses 7 bits for alphanumeric characters?

a) Unicode

b) ASCII

c) EBCDIC

d) UTF-8

Answer: b) ASCII
In isolated I/O, which type of instructions are used for communication?

a) Arithmetic

b) Control

c) Input and Output

d) Memory management

Answer: c) Input and Output
What type of I/O devices are used to store data?

a) Output devices

b) Input-output devices

c) Input devices

d) Storage devices

Answer: d) Storage devices
Which of the following is used to transfer data between CPU and memory?

a) Programmed I/O

b) Memory-mapped I/O

c) Direct Memory Access (DMA)

d) Interrupt-driven I/O

Answer: b) Memory-mapped I/O
In which type of interrupt handling system do devices have their own interrupt vectors?

a) Daisy-chaining

b) Polling

c) Parallel priority

d) Serial priority

Answer: c) Parallel priority
Which technique allows DMA to transfer one word at a time and release the bus back to the CPU?

a) Burst transfer

b) Cycle stealing

c) Interrupt-driven I/O

d) Programmed I/O

Answer: b) Cycle stealing
Which peripheral device is used to create digital signatures on documents?

a) Mouse

b) Printer

c) Digitizer

d) Scanner

Answer: c) Digitizer
What is the purpose of a control command in an I/O interface?

a) To activate the peripheral device

b) To test the status of the device

c) To read data from memory

d) To write data to memory

Answer: a) To activate the peripheral device
Which of the following stores alphanumeric information in binary code?

a) EBCDIC

b) ASCII

c) UTF-16

d) UTF-8

Answer: b) ASCII
In a daisy-chain priority system, what happens if a device has the highest priority?

a) It waits for other devices to finish

b) It immediately processes the interrupt

c) It passes the interrupt signal to the next device

d) It ignores the interrupt signal

Answer: b) It immediately processes the interrupt
What is the function of the word count register in DMA?

a) To store the number of data words to be transferred

b) To control the transfer rate

c) To store the memory address of data

d) To generate control signals

Answer: a) To store the number of data words to be transferred
Which method involves the CPU sending an interrupt request to a specific device?

a) Memory-mapped I/O

b) Isolated I/O

c) Interrupt-initiated I/O

d) Programmed I/O

Answer: c) Interrupt-initiated I/O
Which input-output method uses CPU as an intermediate path for data transfer?

a) Direct Memory Access

b) Interrupt-initiated I/O

c) Programmed I/O

d) Isolated I/O

Answer: c) Programmed I/O
What is the main disadvantage of using polling for interrupt handling?

a) It's fast

b) It requires more hardware

c) It can be slow and inefficient

d) It’s hard to implement

Answer: c) It can be slow and inefficient
Which type of device is a plotter?

a) Input device

b) Output device

c) Input-output device

d) Storage device

Answer: b) Output device
In which mode does the CPU respond to the interrupt when it finishes its current instruction?

a) Immediate response mode

b) Asynchronous mode

c) Synchronous mode

d) Deferred response mode

Answer: c) Synchronous mode
What does the status command do in an I/O interface?

a) It tests various status conditions in the interface

b) It transfers data from CPU to the peripheral

c) It writes data to memory

d) It reads data from memory

Answer: a) It tests various status conditions in the interface
Which type of I/O device converts light signals into electronic signals?

a) Printer

b) Touch screen

c) Light pen

d) Mouse

Answer: c) Light pen
What does DMA stand for?

a) Direct Memory Application

b) Direct Memory Access

c) Device Memory Application

d) Data Memory Access

Answer: b) Direct Memory Access
Which device is used for hard copy output?

a) Monitor

b) Printer

c) Touch screen

d) Barcode reader

Answer: b) Printer
In asynchronous data transfer, how do units communicate?

a) By sharing the same clock