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In this Class 9 Artificial Intelligence topic under ICT (Information & Communication Technology) Skills-I, students learn how a computer system is built and how its main components work together. They explore hardware such as the CPU, memory, storage devices, input devices, and output devices, along with the role of software in operating the system. The topic helps learners understand the flow of data from input to processing, storage, and output, building a clear foundation for using digital tools and studying AI.
TOPIC PRACTICE
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Easy · Level 12View options
Webcam and Microphone
Printer and Projector
Speaker and Monitor
Mouse and Hard Disk
Easy · Level 12View options
Only a storage medium
A complete computer system
Only a communication network
Only application software
Easy · Level 12View options
Large files must be transferred to an external drive
Monitor dust must be cleaned
Keyboard colour must be changed
Paper must be loaded in a printer
Easy · Level 12View options
It only sends power
It can carry both digital video and audio
It only sends network data
It stores files permanently
Easy · Level 12View options
It only produces sound
It only stores data
It displays output and also accepts input through touch
It only supplies power
Easy · Level 12View options
Printing is input and scanning is output
Both are only input
Both are only output
Scanning is input and printing is output
Easy · Level 12View options
Higher network speed
Greater storage capacity
More dots per inch and generally finer print detail
Higher sound level
Easy · Level 12View options
Basic speaker
Keyboard only
Touchscreen
Printer only
Easy · Level 12View options
When the central processing unit must be replaced
When the hard disk must be formatted
When more devices must be connected than the available USB ports
When monitor brightness must be increased
Easy · Level 12View options
It only supplies power
It increases storage capacity
It performs central processing
It can carry both digital video and audio through one cable
Easy · Level 12View options
Magnetic head
Electric fan
Mechanical keyboard
Reflection of laser light
Question 1EasyLevel 12
Which two input components are required to send video and capture voice in an online meeting?
Correct answer: A
The governing concept is matching input devices to the type of data they capture. A webcam captures moving visual input, while a microphone captures sound input; together they send video and voice during an online meeting, so option A is correct. A monitor and speaker mainly provide output, a printer and projector display or print information, and a hard disk stores data rather than capturing it.
What is formed by the coordination of input, processing, storage, and output units?
Correct answer: B
The governing concept is the functional organization of a computer system. Input units enter data, the processing unit works on it, storage keeps data or instructions, and output units present the result. When these units operate together, they form a complete computer system. Option A names only storage, C describes a network, and D refers only to software, so none covers the coordinated hardware functions.
In which situation is USB port data speed important?
Correct answer: A
The governing concept is data-transfer bandwidth. USB speed matters when a large amount of digital data must move between the computer and a storage device. A faster compatible USB port can transfer a large video folder or backup in less time, although the drive and cable must also support that speed. Therefore, option A is correct. Cleaning a monitor, changing keyboard colour, and loading printer paper do not involve substantial USB data transfer.
Which benefit of an HDMI port distinguishes it from older video-only connections?
Correct answer: B
The governing concept is the type of signal a port carries. HDMI is a digital interface designed to transmit high-quality video and audio through one cable, reducing the need for separate audio connections in many setups. Therefore, option B is correct. It is not primarily a power-only, network-only, or permanent-storage connection. Older video-only interfaces generally required a separate route for sound.
The governing concept is the distinction between input and output devices. A touchscreen displays text, images, menus, and results, so it performs an output function. It also detects a user’s touch and converts that action into commands or selections, so it performs an input function. Hence option C is correct. Storage, sound production, and power supply are not the reason it is called a combined device.
In a multifunction printer which function is input and which is output?
Correct answer: D
The governing concept is the direction of information flow. During scanning, the device captures text or an image from a paper document and sends digital information into the computer, so scanning is input. During printing, the computer sends information to the printer, which produces a paper copy, so printing is output. Therefore, option D is correct; option A reverses the directions and B and C classify both functions incorrectly.
DPI means dots per inch and is a measure of printer resolution. A higher DPI indicates that the printer can place more individual dots within each inch, generally allowing finer detail and sharper-looking text or images. Therefore, option C is correct. Network speed, storage capacity, and sound level describe other computer or device characteristics; none explains DPI. Actual quality can also depend on paper, ink, and image source.
Which example shows one device performing both input and output roles?
Correct answer: C
The governing concept is the distinction between input and output devices. A touchscreen displays text, images, and controls, so it performs an output function; it also detects a user’s touch and sends that information to the computer, so it performs an input function. Thus option C is correct. A basic speaker produces sound, a keyboard only enters keystrokes, and a printer produces printed output, so those choices do not normally perform both roles.
The governing concept is USB port expansion. A USB hub connects to one computer USB port and provides several additional ports, allowing devices such as a keyboard, mouse, storage drive, or camera to be connected when the computer has too few ports. Thus option C is correct. A hub does not replace the CPU, format a hard disk, or control monitor brightness. If many power-hungry devices are attached, a powered hub may be needed.
What is a major advantage of High-Definition Multimedia Interface over a video-only connection?
Correct answer: D
The governing concept is multimedia signal transmission. HDMI is a digital interface designed to carry high-quality video and audio through the same cable, so a separate audio cable is often unnecessary. Option D is correct because it states the principal advantage over a video-only connection. HDMI does not increase storage, perform CPU processing, or merely supply electrical power. Actual supported resolution, refresh rate, and audio formats depend on the devices and HDMI version.
What is the main basis for reading data from an optical disc?
Correct answer: D
The governing concept is optical data storage. An optical drive shines a laser onto the disc surface and detects differences in the reflected light caused by microscopic recorded features. The detected pattern is interpreted as digital data. Therefore option D is correct. A magnetic head belongs to magnetic storage such as a hard disk, while a fan and a keyboard have no role in reading an optical disc. CDs and DVDs use this optical reading principle.
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