Olympiad Test: Input, Output And Storage Devices - 2 - Class 8 MCQ

To complete the process of sending a soft copy of his ID card to the passport office online, Ali will need the following devices:
1. Desktop Computer: Ali already has a desktop computer, which will serve as the primary device for completing the process.
2. Scanner: A scanner is required to convert the physical ID card into a digital format. Ali can use a flatbed scanner or a document scanner to scan his ID card and create a digital copy.
3. LAN Card: A LAN card, also known as a network adapter, is necessary to connect the desktop computer to the internet. It allows Ali to access the online platform of the passport office and upload the scanned ID card securely.
Therefore, the correct answer is A: LAN card and Scanner.

Input devices required for a security system in an office:

1. Fingerprint Scanner / Reader:

• This input device is used to authenticate the identity of individuals based on their fingerprints.


• Each employee can register their fingerprints, and the system will compare it with the stored data to grant access.

2. Camera:

• Cameras are essential for monitoring and recording activities within the office premises.


• They can capture live footage or record videos that can be reviewed later for any security incidents.

3. OCR (Optical Character Recognition):

• OCR is used to convert printed or handwritten text into digital data.


• This input device can be used to scan and recognize important documents or ID cards for security purposes.

4. OMR (Optical Mark Recognition):

• OMR devices are used to read and interpret marked forms or documents.


• In a security system, OMR can be used for attendance tracking or access control by scanning specific markers on ID cards or badges.

Therefore, Mr. Imran will require a fingerprint scanner/reader and a camera as input devices for his office security system. These devices will ensure secure access control and surveillance within the premises.

The device that uses a laser beam to read and interpret barcodes is the Barcode reader.
Explanation:
The Barcode reader is a device that uses a laser beam to read and interpret barcodes. It is commonly used in retail and logistics industries to quickly and accurately scan barcodes on products and packages.
Here is a detailed explanation of why the other options are incorrect:
- Voice input system: A voice input system is a technology that allows users to input data or commands using their voice. It does not use a laser beam to read barcodes.
- Touch screen: A touch screen is an input device that allows users to interact with a computer or electronic device by touching the screen. It does not use a laser beam to read barcodes.
- Joystick: A joystick is an input device used for controlling video games or other computer systems. It does not use a laser beam to read barcodes.
In conclusion, the correct answer is Barcode reader, as it uses a laser beam to read and interpret barcodes.

Output Devices that Provide Hardcopy:
There are several output devices that provide hardcopy, including:
- Dot matrix printer:
- This printer uses a series of tiny pins to strike an ink ribbon and transfer ink onto the paper in a dot matrix pattern.
- It can produce high-quality text and graphics.
- Dot matrix printers are commonly used in applications that require multiple copies, such as invoices and receipts.
- Daisy wheel printer:
- This printer uses a wheel or disk with characters on its spokes.
- When a character is selected, the wheel rotates, and the selected character strikes an ink ribbon to transfer ink onto the paper.
- Daisy wheel printers are known for their precise and high-quality text output.
- Inkjet printer:
- This printer sprays tiny droplets of ink onto the paper to create text and images.
- Inkjet printers are widely used due to their versatility and ability to produce high-quality color prints.
- They are suitable for both text documents and photo printing.
- All of these:
- The correct answer is D, as all of the above mentioned output devices provide hardcopy.
In conclusion, dot matrix printers, daisy wheel printers, and inkjet printers are all examples of output devices that can provide hardcopy. The choice of the output device depends on the specific requirements of the printing task, such as the need for multiple copies, text quality, or color output.

Types of Mouse:
There are several types of computer mice available in the market. Among them, the following are commonly used:
Mechanical Mouse:
- A mechanical mouse is one of the oldest types of computer mice.
- It uses a rubber or metal ball to track movement.
- The ball rotates as the mouse is moved, and the sensors detect the rotation to determine the cursor movement.
- Mechanical mice are less accurate and require regular cleaning as the ball can collect dust and debris.
Serial Mouse:
- A serial mouse is connected to the computer through a serial port.
- It uses a serial communication protocol to transmit data between the mouse and the computer.
- Serial mice are less common nowadays as most computers no longer have serial ports.
Optical Mouse:
- An optical mouse uses a light-emitting diode (LED) or laser to track movement.
- The light is reflected off the surface beneath the mouse, and the sensors detect the movement of the reflected light.
- Optical mice are more accurate and do not require regular cleaning like mechanical mice.
- They are the most common type of mouse used today.
All of these:
- The correct answer to the given question is "All of these."
- This means that all the mentioned types (mechanical, serial, and optical) are different types of computer mice.
In conclusion, the types of mice mentioned in the options are all valid types of computer mice. Mechanical, serial, and optical mice have different mechanisms for tracking movement and are used in different situations. However, the most commonly used type of mouse today is the optical mouse.

The device having different types of keys on it is called a Keyboard.
A keyboard is a device that allows input of characters and commands into a computer or other electronic device. It consists of various types of keys that perform different functions. The keys on a keyboard include:
1. Alphanumeric Keys: These keys include letters, numbers, and special characters such as punctuation marks.
2. Numeric Keypad: This section consists of a set of keys arranged in a grid pattern, similar to a calculator, which allows quick input of numerical data.
3. Function Keys: These are a row of keys labeled F1 to F12, located at the top of the keyboard. They have predefined functions and can be programmed to perform specific tasks in different applications.
4. Modifier Keys: These keys include Shift, Ctrl (Control), Alt (Alternate), and the Windows key (on Windows-based keyboards). They are used in combination with other keys to perform specific actions or access shortcuts.
5. Arrow Keys: These keys are used for navigating through documents, web pages, or menus. They include Up, Down, Left, and Right arrows.
6. Special Keys: Some keyboards may have additional special keys, such as multimedia keys for controlling audio or video playback, volume control keys, and shortcut keys for launching specific programs or functions.
Overall, a keyboard is an essential input device that allows users to interact with a computer by typing characters, entering commands, and accessing various functions and shortcuts.

Answer:
The device that has a ball beneath it for rotation is the Trackball. Here is a detailed explanation:
Trackball:
- A trackball is a pointing device that consists of a ball housed in a socket.
- The user can rotate the ball with their fingers or palm to move the on-screen cursor.
- The movement of the ball translates into corresponding movements of the cursor.
- Trackballs are often used as an alternative to a traditional mouse, especially in situations where space is limited or precise control is required.
Other options mentioned in the question are not correct:
- Lightpen: A lightpen is a device used to select and interact with objects displayed on a computer screen by directly touching the screen.
- Mouse: A mouse is a pointing device that typically moves on a flat surface and uses a sensor or laser to track its movement.
- Scanner: A scanner is a device used to convert physical documents or images into digital form.
Therefore, the correct answer is option C: Trackball.

Device that converts any type of printed information into digital pulses:
The correct answer is Scanner.
Here is a detailed explanation:
Definition of a scanner:
A scanner is a device that converts physical documents or images into digital format by scanning and capturing the information. It uses optical sensors to read the printed information and convert it into a series of digital pulses.
Working of a scanner:
1. Optical sensors: Scanners use optical sensors to detect and capture the printed information. These sensors work by reflecting light off the document and measuring the reflected light intensity.
2. Image capture: The scanner captures the reflected light and converts it into a digital image.
3. Optical character recognition (OCR): Scanners often include OCR technology, which can recognize and convert printed text into editable digital text.
4. Digital output: The scanned document or image is then converted into a digital format, such as a PDF or image file, which can be stored, edited, or shared electronically.
Advantages of using a scanner:
- Preservation of physical documents: Scanning allows you to create digital copies of important documents, reducing the need for physical storage and preserving the information for future reference.
- Easy sharing and distribution: Digital files can be easily shared via email, cloud storage, or other electronic means, making it convenient to distribute information.
- Editable text: With OCR technology, scanned documents can be converted into editable text, enabling easy modifications or extraction of specific information.
- Improved accessibility: Digital documents can be easily accessed and read by devices that support text-to-speech or other accessibility features.
In conclusion, a scanner is the device that converts any type of printed information into digital pulses. It is a useful tool for digitizing and managing physical documents or images.

Device with a ball that can be spun in various directions:
- The correct answer is Trackball.
- A trackball is a pointing device that consists of a ball on top that can be rotated with the fingers or palm of the hand.
- The ball controls the movement of the cursor on the screen.
- Unlike a mouse, which is moved on a surface, a trackball is stationary and the ball is manipulated by the user.
- The user can spin the ball in various directions to move the cursor in different directions.
- Trackballs are often used as an alternative to mice for people with limited mobility or for those who prefer a different input method.
- They are commonly found in computer systems, gaming devices, and industrial applications.
Other options:
- Mouse: A mouse is a pointing device that typically has buttons and a scroll wheel, but no ball for spinning.
- Scanner: A scanner is a device used to digitize images or documents, it does not have a ball for spinning.
- Joystick: A joystick is a device used for controlling the movement of objects, such as in gaming or aviation simulations, but it does not have a ball for spinning.
Therefore, the correct answer is C: Trackball.

Device used to draw lines or figures on a computer screen:
There are several devices that can be used to draw lines or figures on a computer screen, but the most common device is a light pen. Here is a detailed explanation of the various devices and why a light pen is the correct answer:
1. Light pen:
- A light pen is a handheld input device that allows users to draw directly on a computer screen by pointing at it.
- It consists of a light-sensitive photocell that can detect light emitted by the screen.
- The light pen is connected to the computer and can transmit the coordinates of the drawing to the software.
- It is used in applications such as graphic design, digital art, and computer-aided design (CAD).
2. Joystick:
- A joystick is primarily used for controlling the movement of objects in video games or flight simulators.
- It does not have the precision or functionality to draw lines or figures on a computer screen.
3. Trackball:
- A trackball is a pointing device that consists of a ball housed in a socket with sensors to detect its movement.
- It is primarily used to move the cursor on the screen, but it does not have the capability to draw lines or figures.
4. Scanner:
- A scanner is a device used to convert physical documents or images into digital format.
- It captures the image or document and creates a digital representation of it.
- While it can be used to capture drawings or figures, it is not specifically designed for drawing directly on a computer screen.
Therefore, the correct answer is A: Light pen as it is specifically designed for drawing lines or figures on a computer screen.

OCR stands for Optical Character Reader.
Here is a detailed explanation of OCR:
Definition:
OCR stands for Optical Character Reader. It is a technology that enables the conversion of different types of documents, such as printed or handwritten text, into machine-readable data.
Working Principle:
OCR technology involves several steps to convert the data:
1. Image Acquisition: The document is scanned or photographed to obtain a digital image.
2. Pre-processing: The acquired image is enhanced to improve the quality and clarity of the text.
3. Segmentation: The image is divided into individual characters or words.
4. Feature Extraction: The unique features of each character or word are identified, such as shape, size, and color.
5. Character Recognition: The extracted features are matched with a database of known characters to determine the most likely character or word.
6. Post-processing: The recognized text is refined and corrected for any errors or inaccuracies.
Applications:
OCR technology has various applications in different industries and sectors, including:
- Document Digitization: OCR can be used to convert physical documents into digital formats, making them searchable and editable.
- Automated Data Entry: OCR can automate the process of entering data from paper documents into computer systems.
- Text-to-Speech: OCR can be used to convert printed text into audio, enabling visually impaired individuals to access written information.
- Language Translation: OCR can assist in translating printed text from one language to another.
- Automatic License Plate Recognition: OCR technology can be used to read and identify license plate numbers in traffic surveillance systems.
Conclusion:
OCR technology plays a crucial role in digitizing and processing large volumes of textual information. It has numerous applications and has revolutionized the way we handle and interact with printed text.

Device that converts spoken words to machine language form:
There are several devices that can convert spoken words to machine language form, but the most commonly used device is a voice input system or voice recognition system. Here is a detailed explanation:
1. Voice recognition system:
- A voice recognition system is designed to convert spoken words into machine-readable text.
- It uses a combination of hardware and software to capture and analyze the sound waves produced by the human voice.
- The system then uses algorithms to convert these sound waves into meaningful words and sentences.
- Voice recognition systems can be found in various devices such as smartphones, smart speakers, and voice assistants.
- They are often used for tasks like dictation, voice commands, and voice-controlled applications.
2. Recording system:
- While a recording system can capture spoken words, it does not necessarily convert them into machine language form.
- It simply records the audio for playback or storage purposes.
- The recorded audio can later be transcribed or processed by a separate system to convert it into text or machine language.
3. Reporting system:
- A reporting system is used to generate reports based on data or information.
- It does not have the capability to convert spoken words into machine language form.
Conclusion:
In conclusion, the device that converts spoken words to machine language form is a voice input system or voice recognition system. These systems use advanced algorithms to analyze and interpret the human voice, converting it into machine-readable text or commands.

CCD stands for Changed Couple Divide.
Explanation:
- CCD does not stand for Changed Couple Divide.

Type of Memory: Random Access Memory (RAM)
RAM, which stands for Random Access Memory, is a type of computer memory that is used to store data that is being actively accessed by the computer's processor. It is a volatile memory, meaning that its contents are lost when the power is turned off. RAM plays a crucial role in the overall performance and speed of a computer system.
Key Characteristics of RAM:
- Random Access: RAM allows for the random access of data, meaning that any storage location in RAM can be accessed directly without having to go through other locations.
- Volatile: RAM is a volatile memory, which means that its contents are lost when the power is turned off or if there is a sudden power failure.
- Read and Write Operations: RAM allows for both read and write operations, making it possible to both retrieve and modify data stored in it.
- Temporary Storage: RAM is used as temporary storage for data that is actively being processed by the computer's CPU.
- Faster Access Speed: Compared to other types of storage like hard drives or solid-state drives, RAM offers much faster access speeds, allowing for quick retrieval and manipulation of data.
Importance of RAM:
- Multitasking: Having sufficient RAM allows a computer to handle multiple tasks simultaneously without slowing down or experiencing performance issues.
- Program Execution: RAM is crucial for running software applications, as it stores the data and instructions required by the CPU to execute programs.
- Speed and Performance: More RAM generally results in better overall system performance, as it reduces the need for the computer to access data from slower storage devices.
In summary, RAM is a type of computer memory known as Random Access Memory, which provides fast and temporary storage for data that is actively being processed by the computer's CPU. It is an essential component for multitasking, program execution, and overall system performance.

Primary memory
- Primary memory, also known as main memory or internal memory, refers to the memory that is directly accessible by the CPU.
- It is volatile memory, meaning that its contents are lost when the computer is powered off.
- Primary memory is responsible for storing data and instructions that are actively being used by the CPU.
- It is faster than secondary memory and is used to store temporary data, program instructions, and the operating system.
- Primary memory is divided into two types: RAM (Random Access Memory) and ROM (Read-Only Memory).
- RAM holds data and instructions that can be read from and written to by the CPU.
- ROM contains permanent instructions that cannot be modified, such as the computer's firmware.
- Examples of primary memory include cache memory, registers, and main memory (RAM).
Secondary memory
- Secondary memory, also known as external memory or auxiliary memory, refers to storage devices that are not directly accessible by the CPU.
- It is non-volatile memory, meaning that its contents are retained even when the computer is powered off.
- Secondary memory is used for long-term storage of data and programs.
- It is slower than primary memory but has larger storage capacity.
- Examples of secondary memory include hard disk drives (HDD), solid-state drives (SSD), optical drives, and flash drives.
Virtual memory
- Virtual memory is a memory management technique that allows the computer to use a portion of the secondary memory as an extension of the primary memory.
- It is a combination of physical RAM and a portion of the hard drive that acts as an overflow storage.
- When the physical RAM is full, the operating system swaps out less frequently used data and instructions to the virtual memory.
- Virtual memory provides the illusion of having more RAM than physically available, allowing programs to run smoothly.
- However, accessing data from virtual memory is slower compared to accessing data from physical RAM.
Real memory
- Real memory is another term for primary memory.
- It refers to the physical memory components that are directly accessible by the CPU.
- Real memory is contrasted with virtual memory, which is an extension of the primary memory using secondary storage.
- Real memory stores data and instructions that are actively used by the CPU, providing fast access to the information.
In conclusion, the memory inside the computer that is directly accessible by the CPU is called primary memory. It is divided into RAM and ROM, and it is responsible for storing data and instructions that are actively used by the CPU. Secondary memory refers to external storage devices, virtual memory is a memory management technique that utilizes a portion of secondary memory as an extension of primary memory, and real memory is another term for primary memory.