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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 8View options
To connect a RAM module to the motherboard
To mount a monitor on a wall
To hold paper in a printer
To record sound
Easy · Level 8View options
Compressing files
Adding extra cards such as graphics or network cards
Scanning paper
Shutting down the computer
Easy · Level 8View options
It types data
It records sound
It displays computer visuals on a large surface
It stores files permanently
Easy · Level 8View options
Storing files permanently
Printing paper
Cooling the computer
Providing image and audio input during a video call
Easy · Level 8View options
Both provide sound output
Both provide permanent storage
Both control the screen pointer
Both print paper
Easy · Level 8View options
Displaying colours on the screen
Renaming files
Recording sound
Operating without a direct power connection
Easy · Level 8View options
Supporting and physically protecting internal components
Creating software instructions
Processing internet data
Scanning paper
Easy · Level 8View options
To connect a microphone
To send visual signals to a monitor or projector
To store data on a pen drive
To load paper into a printer
Easy · Level 8View options
Hard disk
Monitor stand
Microphone or headphones
Motherboard
Easy · Level 8View options
It connects only monitors
It only switches off power
It only records sound
It can connect many types of external devices
Easy · Level 8View options
Only playing sound
Keeping data, instructions and results
Only scanning images
Cooling the computer
Easy · Level 8View options
Both are output devices
Both are input devices
The microphone is an input device and the speaker is an output device
The microphone is storage and the speaker is a processing device
Easy · Level 8View options
Central Processing Unit
Monitor
Keyboard
Printer
Easy · Level 8View options
Monitor
Keyboard
Speaker
Projector
Easy · Level 8View options
Scanner
Mouse
Monitor
Microphone
Easy · Level 8View options
Hard disk drive
Control unit
Mouse
Cache memory
Easy · Level 8View options
Hard disk drive
Solid state drive
Optical disc
Magnetic tape
Easy · Level 8View options
Scanner
Speaker
Mouse
Printer
Easy · Level 8View options
Microphone
Headphones
Monitor
Printer
Easy · Level 8View options
Webcam
Speaker
Scanner
Mouse
Easy · Level 8View options
Mouse
Scanner
Modem
Projector
Easy · Level 8View options
Touchscreen
Standard monitor
Speaker
Printer
Easy · Level 8View options
Motherboard
Power supply unit
Main memory
Hard disk
Easy · Level 8View options
Processing unit
Storage unit
Input unit
Output unit
Easy · Level 8View options
Main memory unit
Control unit
Input unit
Output unit
Question 1EasyLevel 8
What is a memory slot used for?
Correct answer: A
A memory slot is a connector on the motherboard designed to hold a RAM module. RAM provides temporary working storage for data and instructions that the processor is currently using. Therefore, option A is correct. Mounting a monitor, holding printer paper and recording sound are unrelated tasks performed by other equipment or mechanisms, not by a motherboard memory slot.
An expansion slot is a connector on the motherboard that permits an additional expansion card to be installed. Such cards can add or improve capabilities, for example graphics, sound or network communication. Option B is correct. File compression is software-based, scanning is done by a scanner, and shutting down is an operating-system or power-control action rather than the purpose of a slot.
The governing concept is that an output device presents processed information to a user. A projector receives visual signals from the computer and enlarges the resulting text, images, or video onto a wall or screen. Thus, option C correctly describes its function. Typing and recording are input activities, whereas permanent file storage belongs to storage devices, not a projector.
For which task are a webcam and microphone most commonly used together?
Correct answer: D
The governing concept is combined input from different devices. A webcam captures the user’s video, while a microphone captures the user’s voice; communication software then sends these inputs during a video call. Therefore, option D is correct. Storage, printing, and cooling are performed by storage hardware, printers, and cooling components rather than by these two input devices.
What is a similarity between a touchpad and a mouse?
Correct answer: C
The governing concept is pointing input. A mouse detects movement on a surface, while a touchpad detects finger movement on a touch-sensitive panel; both translate that movement into pointer movement on the screen. Therefore, option C is correct. Neither device is primarily a sound output device, storage device, or printer, so A, B, and D are incorrect.
If a laptop battery fails which capability is directly affected?
Correct answer: D
The governing concept is the role of a power source. A laptop battery stores electrical energy and allows the computer to operate when it is not connected directly to an electrical outlet. If the battery fails, portability and battery-powered operation are lost, so option D is correct. Displaying colours, renaming files, and recording sound depend mainly on other hardware and software functions.
The governing concept is physical organisation and protection of computer hardware. The case holds components such as the motherboard, power supply, storage drives, and cooling parts in a structured enclosure, protecting them from accidental contact and helping manage airflow. Therefore, option A is correct. Software creation, internet-data processing, and paper scanning are not the case’s primary functions.
The governing concept is matching a port to the type of signal it carries. A video port transmits visual output from a computer to a display device, such as a monitor, television, or projector. Thus, option B is correct. A microphone normally uses an audio connection, a pen drive uses a data port, and loading paper is a mechanical printer operation, so A, C, and D are unsuitable.
The governing concept is the function of ports according to the signal they carry. An audio port handles sound signals: a microphone sends sound into the computer, while headphones receive sound from it. Therefore, option C is correct. A hard disk and motherboard are internal hardware components, and a monitor stand is only a physical support, so none of those is an appropriate audio-port device.
The governing concept is a computer interface: a USB port provides a standard connection for exchanging data and, in many cases, supplying limited power. It can connect keyboards, mice, printers, cameras, storage drives and other compatible peripherals. Therefore, option D is correct. Options A and C are too narrow, while B describes no normal function of a USB port.
What is the purpose of the storage unit in a computer system?
Correct answer: B
The governing concept is computer storage. A storage unit holds data, programs or instructions, and results so they can be used later. Primary memory may hold working information temporarily, while secondary storage such as an SSD or hard drive can retain files for a longer period. Thus option B is correct. Playing sound and scanning images are device functions, whereas cooling is handled by fans or other cooling hardware.
A user gives voice through a microphone and hears the result through speakers. What is the correct classification?
Correct answer: C
The governing concept is the direction of data flow. A microphone captures sound from the user and sends that audio into the computer, so it is an input device. A speaker receives processed audio signals from the computer and produces sound for the user, so it is an output device. Therefore option C is correct; the other choices reverse or misclassify the roles.
Which main part of a computer system processes instructions?
Correct answer: A
The governing concept is the role of the CPU in the fetch, decode, and execution cycle. The Central Processing Unit interprets program instructions and performs or controls the processing needed to produce results, so option A is correct. A monitor displays results, a keyboard supplies input, and a printer produces a paper output; none of these is the main instruction-processing unit.
Which of the following devices receives data from the user and sends it to the computer?
Correct answer: B
The governing concept is the distinction between input and output devices. A keyboard receives letters, numbers, and commands from the user and converts key presses into signals that the computer can process, so option B is correct. A monitor, speaker, and projector communicate processed information outward to the user, making them output devices rather than user-input devices.
Which device displays processed results in visual form?
Correct answer: C
The governing concept is output: information produced after processing must be communicated to the user. A monitor displays text, images, and other processed results on its screen, so option C is correct. A scanner, mouse, and microphone are input devices because they send images, movement commands, or sound into the computer rather than displaying its processed results.
Which component is used to store a large amount of files permanently in a computer?
Correct answer: A
The governing concept is secondary, non-volatile storage. A hard disk drive stores operating-system files, applications, documents, pictures, and other data even after the computer is switched off, so option A is correct. The control unit manages instruction execution, a mouse is an input device, and cache memory is a small, fast temporary memory rather than a large permanent file store.
Which storage device uses flash memory without moving mechanical parts?
Correct answer: B
The governing concept is solid-state storage. A solid-state drive, or SSD, records data in flash-memory chips, so it has no spinning platters, read-write heads, or other moving mechanical parts; therefore option B is correct. A hard disk uses rotating magnetic platters, while optical discs and magnetic tape rely on different physical storage mechanisms.
Which device is commonly used to control the pointer on a computer screen?
Correct answer: C
The governing concept is pointing input. A mouse detects hand movement and converts it into movement of the on-screen pointer; its buttons also let the user click, select, drag, and open objects, making option C correct. A scanner captures images, a speaker produces sound, and a printer creates paper output, so none of those controls the pointer directly.
Which device is required to provide voice as input to a computer?
Correct answer: A
The governing concept is audio input. A microphone receives sound waves from a speaker and converts them into electrical or digital signals that the computer can record, process, or recognize, so option A is correct. Headphones are normally output devices, a monitor displays visual information, and a printer produces printed output rather than accepting voice.
Which output device is used to hear sound from a computer?
Correct answer: B
The governing concept is audio output. A speaker converts the computer’s processed electrical or digital audio signal into vibrations in the air, allowing a person to hear sound; therefore option B is correct. A webcam captures video, a scanner captures printed images or text, and a mouse sends pointing commands, so they are input devices rather than sound-output devices.
Which device is most suitable for displaying a computer image on a large screen?
Correct answer: D
The governing concept is visual output on an enlarged display surface. A projector receives the computer’s video signal and enlarges the image by casting light onto a wall or screen, so option D is correct. A mouse supplies pointing input, a scanner captures physical documents, and a modem handles communication signals; none is designed primarily to show a large computer image.
Which device can both display images and receive commands through touch?
Correct answer: A
The governing concept is a dual-function input-output device. A touchscreen displays text, images, and controls like a monitor, while its touch-sensitive surface detects a finger or stylus and sends the selected command to the computer; therefore option A is correct. A standard monitor usually only displays, a speaker produces sound, and a printer creates paper output.
Which part supplies the required electrical power to all computer components?
Correct answer: B
The governing concept is power delivery in a computer system. The power supply unit, or PSU, receives electricity from the mains, converts it into suitable regulated voltages such as DC, and distributes power to the motherboard, processor, drives, and other components; therefore option B is correct. The motherboard connects parts, memory holds active data, and a hard disk stores files.
Which unit first receives data entered by a user in a computer system?
Correct answer: C
The governing concept is the input–process–output cycle. The input unit receives raw data and instructions from the user through devices such as a keyboard, mouse, scanner, or microphone. It is therefore the first receiving unit, making option C correct. The processing unit works on the data after entry, storage preserves it, and the output unit presents the processed result to the user.
Which unit delivers processed information to the user?
Correct answer: D
The governing concept is the output stage of the input–process–output cycle. After the computer processes data, the output unit communicates the resulting information through a monitor, speaker, printer, or similar device. Hence option D is correct. Main memory temporarily holds working data, the control unit directs operations, and the input unit accepts data; none primarily presents the finished result to the user.
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