(Grade IX) Chapter 1 - Introduction to Computer System (Part 2- Input Devices)

 

Exercise- Page number 39

Full Forms

i. USB – Universal Serial Bus
ii. ATM – Automated Teller Machine
iii. CPU – Central Processing Unit
iv. ALU – Arithmetic Logic Unit
v. CU – Control Unit
vi. MU – Memory Unit
vii. RAM – Random Access Memory
viii. SSD – Solid State Drive
ix. PSU – Power Supply Unit
x. ROM – Read Only Memory
xi. Bits – Binary Digits
xii. SRAM – Static Random Access Memory
xiii. DRAM – Dynamic Random Access Memory
xiv. PROM – Programmable Read Only Memory
xv. EPROM – Erasable Programmable Read Only Memory
xvi. EEPROM – Electrically Erasable Programmable Read Only Memory
xvii. CD – Compact Disc
xviii. DVD – Digital Versatile Disc / Digital Video Disc
xix. VDU – Visual Display Unit
xx. CRT – Cathode Ray Tube
xxi. LCD – Liquid Crystal Display
xxii. LED – Light Emitting Diode
xxiii. HDMI – High-Definition Multimedia Interface
xxiv. VGA – Video Graphics Array
xxv. LAN – Local Area Network
xxvi. Gbps – Gigabits per second
xxvii. Mbps – Megabits per second

 

Short Answer Questions

a. What is a computer system?
A computer system is a complete setup that includes hardware and software working together to perform tasks.

Main units of a computer system:

Input Unit

Processing Unit (CPU)

Memory Unit

Output Unit

Storage Unit

 b. What is an input device?

An input device is a hardware device used to send data to a computer.

Four input devices:

Keyboard

Mouse

Scanner

Microphone

 c. What is an output device?
An output device shows or gives the result of computer processing.Examples: Monitor, Printer

 Differentiate between:

Input Unit vs Output Unit

 

Long Answer Questions

 

a. Explain the role of input devices in a computer system. Provide examples and describe their functions.
Input devices are tools that allow users to enter data into a computer. They are the first step in the data processing cycle.

Keyboard: Used to type text and commands.

Mouse: Used to click, drag, and select objects on screen.

Scanner: Converts physical documents into digital form.

Microphone: Sends voice or sound to the computer.
These devices help the computer understand what the user wants it to do.

 

b. How do input devices like keyboards and mouse differ from more advanced input devices such as touchscreens or biometric scanners?

Keyboard/Mouse are traditional input devices needing physical action.

Touchscreens let users touch the screen directly for input.

Biometric scanners use fingerprints or face recognition to input or verify identity.
Advanced devices are often faster, more secure, and easier to use in modern applications.