JAMB UTME - Computer Studies - 2022

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When an input signal of 1 is applied to a NOT gate, the output will be 0. A NOT gate, also known as an inverter, is a digital logic gate that has one input and one output. The output of a NOT gate is the opposite of the input; if the input is high (1), the output will be low (0), and if the input is low (0), the output will be high (1). In other words, the NOT gate "inverts" the input signal. So, when a 1 is input to a NOT gate, the gate will invert it to 0 and produce that as the output signal. Similarly, when a 0 is input to a NOT gate, the gate will invert it to 1 and output that as the result.

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The Windows Explorer is divided into five categories, which are: 1. Quick Access: This category contains shortcuts to frequently accessed folders and files, such as the Desktop, Documents, and Downloads folders. 2. OneDrive: This category displays files and folders stored on OneDrive, Microsoft's cloud storage service. 3. This PC: This category displays all the drives and storage devices connected to the computer, including the hard drive, external drives, and USB flash drives. 4. Network: This category displays other devices on the local network, such as other computers or printers that are connected. 5. Recycle Bin: This category contains files and folders that have been deleted from the computer and are waiting to be permanently deleted or restored. These categories help users easily navigate and find files and folders on their computer, as well as access files and folders stored in the cloud or on other devices connected to the network.

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A logic circuit performs "processing and controlling" functions. A logic circuit is an electronic circuit that performs a specific logical operation, which is based on the principles of Boolean algebra. It takes one or more digital inputs and produces a digital output based on a set of rules, known as a truth table. The primary function of a logic circuit is to process and control the input signals to produce a desired output signal. In other words, it performs logical operations on the input signals to generate the desired output signal. This makes it a processing and controlling device. For example, a logic circuit can be used to perform a simple logic function, such as a logical AND operation, which takes two input signals and produces an output signal that is true only when both input signals are true. This output signal can then be used to control the behavior of another device or system. In summary, logic circuits are used in a wide variety of electronic devices, such as computers, calculators, and mobile phones, to process and control digital signals, which makes them an essential component of digital technology.

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The full form of TCP is Transmission Control Protocol. TCP is a communication protocol that is used to send and receive data over the internet. It is one of the main protocols in the Internet Protocol Suite (commonly referred to as TCP/IP), which is the set of rules and standards that govern how data is transmitted on the internet. TCP provides a reliable, ordered, and error-checked delivery of data between applications running on different devices. It breaks down the data into small packets, and each packet is numbered and tracked to ensure that it arrives at its destination in the correct order and without errors. If a packet is lost or damaged during transmission, TCP detects the error and retransmits the missing or damaged packet. TCP is widely used for sending and receiving data between web servers and web browsers, and for many other applications that require reliable and error-free data transmission over the internet.

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The 2-input gate that can be used to pass a digital waveform unchanged at certain times and inverted at other times is the XOR (exclusive OR) gate. An XOR gate has two input signals and one output signal. The output is HIGH (1) if the two input signals are different, and LOW (0) if the two input signals are the same. In other words, an XOR gate produces an output signal that is the "exclusive or" of its two input signals. When one of the input signals is held at a constant logic level (either HIGH or LOW), the XOR gate can be used to pass the other input signal unchanged or inverted, depending on the value of the constant signal. If the constant signal is HIGH, the output signal will be inverted; if the constant signal is LOW, the output signal will be unchanged. This property of the XOR gate makes it useful in digital electronics for a variety of applications, such as data encryption, error detection and correction, and clock synchronization.

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The binary system has a radix of 2. The radix of a number system is the number of unique digits used in that system. For example, in the decimal system (base 10), the radix is 10, because we use 10 unique digits (0 to 9) to represent numbers. In the binary system (base 2), the radix is 2, because we only use 2 unique digits: 0 and 1. This means that every number can be represented as a combination of only 0s and 1s in the binary system.

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Large retailers use data mining to study trends. Data mining is the process of analyzing large amounts of data and identifying patterns and trends in that data to make informed decisions. This can involve looking at customer behavior, sales data, market trends, and other types of data to gain insights into what products are popular, what customers are looking for, and how the market is changing. The goal of data mining is to help retailers make informed decisions about their business and stay ahead of the competition.

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A computer cannot boot if it does not have an operating system (OS). An operating system is the most basic software that runs on a computer and is responsible for managing and coordinating all the activities of the computer hardware and software. It is the first program that runs when the computer starts up, and it is responsible for initializing the hardware and loading other software, such as device drivers and applications. Without an operating system, the computer would not be able to perform any useful tasks, as it would not have the necessary software to control and manage its hardware components. Examples of popular operating systems include Microsoft Windows, macOS, and Linux.

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The process of feeding instructions into a computer system is called "inputting." It involves providing data, commands, or other types of information to a computer system so that it can process and execute the instructions. When you input data or commands into a computer system, you typically use an input device such as a keyboard, mouse, or microphone to provide the information. The computer then processes the input data using its internal logic and algorithms, and generates an output based on the instructions it received. For example, when you type a document using a keyboard and input the data into a word processing software, the computer processes the text and generates an output in the form of a document that you can save, print, or share. In summary, inputting is the process of providing information or instructions to a computer system, which is then processed and executed by the computer to generate an output.

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An Operating System (OS) is a type of system software. It is a program that manages the hardware and software resources of a computer, and provides a platform for other software applications to run on. The OS controls the input/output operations, manages memory and storage resources, and schedules tasks to be executed by the computer's processor. Examples of common operating systems include Windows, macOS, Linux, and Android.

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Internet Explorer is a web browser that is used to view web pages on the internet. It allows users to access different websites and view the content on those sites, such as text, images, videos, and other media. Internet Explorer is designed to make it easy for users to navigate the internet by providing tools such as search bars, bookmarks, and tabs. While it may be possible to play movies or music within Internet Explorer, its primary purpose is to browse the internet and display web pages.

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The example of an output device is a speaker. An output device is any device that receives information or data from a computer or electronic device and presents or displays it to the user in a perceivable format. In the case of a speaker, it receives sound data from a computer or electronic device and produces audible sound waves that can be heard by the user. Speakers are commonly used to play music, watch videos or movies, and listen to audio from video games. On the other hand, a keyboard and mouse are examples of input devices because they allow the user to input data or commands into a computer or electronic device. Similarly, a microphone is also an input device as it converts sound waves into electrical signals that can be processed by a computer or electronic device.

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Encryption helps with safe delivery of messages to their destination without being accessed by a third party. Encryption is a process of converting plain text into coded or scrambled text so that only authorized parties who have the key can access and understand the original message. This means that even if an unauthorized person intercepts the message during transit, they cannot read or understand it because it is encrypted. Encryption is commonly used to protect sensitive data such as passwords, credit card numbers, and personal information when it is transmitted over the internet. It also helps to protect confidential business or government communications from hackers, cybercriminals, and other unauthorized third parties. Therefore, encryption helps to ensure that messages are delivered safely and securely to their intended recipients without being accessed or intercepted by unauthorized parties.

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A bit is the smallest unit of digital information in computing, and it can have two possible values: 0 or 1. This is because a bit is used to represent a binary digit, which can be either on or off, true or false, or high or low. So, the answer is 2. To give an example, imagine a light switch that can either be turned on or off. We can use a bit to represent the state of the switch, where 0 represents the switch being off, and 1 represents the switch being on. In this case, a single bit is enough to represent the two possible states of the switch. Similarly, in computing, a single bit is enough to represent two possible states of any digital information.

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Out of the given options, "Memory unit" doesn't belong to the group. Flash drive, floppy disk, and compact disk are all examples of storage devices that store digital data. In contrast, "Memory unit" is a broad term that can refer to any device or component that stores data temporarily or permanently. While flash drives, floppy disks, and compact disks are all types of memory units in the sense that they store data, the term "memory unit" is more general and encompasses other types of storage, such as hard drives, solid-state drives, and RAM (Random Access Memory). Therefore, "Memory unit" is the odd one out in this group, as it is not a specific type of storage device like the other options.

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The operating system (OS) tells the computer how to use its components. An operating system is a software program that manages the computer hardware and software resources and provides common services for computer programs. The operating system acts as an intermediary between the computer's hardware and the programs or applications that run on the computer. It is responsible for controlling and allocating memory, prioritizing system requests, ensuring security, and managing input/output operations. In short, the operating system acts as the foundation for the computer to function and allows different applications and programs to communicate with the hardware and work together.

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The type of network that is usually contained inside one office building is called a Local Area Network or LAN. A LAN is a computer network that connects devices within a relatively small area, such as a single building, office, or campus. It is designed to allow computers and other devices to communicate with each other and share resources, such as printers, files, and internet access. LANs are typically owned and operated by a single organization, such as a business or government agency, and are often built using Ethernet cables or Wi-Fi technology. LANs are used to facilitate communication and data sharing between employees within an office building or other confined area, and are often more secure than other types of networks because they are not connected to the internet. In summary, a LAN is the type of network that you would most commonly find inside one office building.

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Computer files can be characterized by their title, accessibility, ability to be modified, and where they are stored. The title of a file is simply its name, which can be used to help identify and organize it among other files. Accessibility refers to whether or not a file can be accessed or viewed by the user. Depending on the permissions set by the owner of the file, it may be accessible to everyone, only to specific users, or not accessible at all. The ability to be modified refers to whether or not the file can be edited or changed in some way. For example, a text file can be modified by adding, deleting, or changing the text within it. Where the file is stored refers to the location on a computer or network where the file is saved. This could be on the computer's hard drive, a USB drive, a cloud storage service, or a network server. Therefore, all four of these characteristics are applicable to computer files and are important to consider when working with them.

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The function of an assembler is to convert assembly language to machine language. Assembly language is a low-level programming language that is used to program computers and microprocessors. It consists of a series of instructions and operations that are written in human-readable text, and the assembler converts these instructions into machine code that the computer can understand and execute. The machine code is a series of binary digits (0s and 1s) that represent the instructions and operations in a form that the computer can process. In this way, the assembler acts as a bridge between the human-readable assembly language and the machine-readable machine code, allowing programmers to write code in a form that is easier for them to understand and debug, while still allowing the computer to execute the code efficiently.

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The number of input combinations for a 4-input gate is 16. To understand why, you can think of each input as having two possible states, either 0 or 1. For a 4-input gate, there are 4 inputs, and each input can be in one of two states. Therefore, the total number of possible input combinations is 2 x 2 x 2 x 2 = 16. To illustrate this further, you can create a truth table that lists all possible input combinations and their corresponding output values for the gate. The truth table will have 16 rows, with each row representing a unique combination of input values.

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MS-DOS cannot be categorized as an application software. MS-DOS is an operating system, not an application. An operating system is the underlying software that manages and controls the hardware and software resources of a computer. An application software, on the other hand, is a program designed to perform a specific task, such as word processing, spreadsheets, or database management.

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Computer applications are an example of software. Software refers to the programs, data, and instructions that tell a computer what to do and how to do it. Computer applications are specific types of software that are designed to perform particular tasks or solve particular problems. Examples of computer applications include web browsers, word processors, email clients, and games. Computer applications are different from computer hardware, which refers to the physical components of a computer, such as the processor, memory, and storage devices. Computer utilities and program packages are different types of software that can be used to manage and maintain a computer system, but they are not the same as computer applications, which are designed for specific tasks and are often used by end-users. In summary, computer applications are a type of software, which refers to the programs, data, and instructions that tell a computer what to do and how to do it. Computer applications are designed to perform specific tasks or solve specific problems, and examples include web browsers, word processors, email clients, and games.

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The first option, "They both deal with memory," is correct. RAM and ROM are both types of memory used in computers and other electronic devices. RAM (Random Access Memory) is a type of volatile memory that stores data temporarily and is used for running programs and applications. When the power is turned off, the data stored in RAM is lost. ROM (Read-Only Memory) is a type of non-volatile memory that stores data permanently and is used for storing the basic input/output system (BIOS) that helps to boot up the computer. The data stored in ROM cannot be easily altered or deleted. In summary, both RAM and ROM are types of memory used in electronic devices, and they both deal with storing and accessing data.

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The delete permission allows someone to remove or delete files and directories. This means that if a user has the delete permission, they can get rid of files and folders that they have access to, and these files and folders will no longer be available on the system. This permission is typically used to allow users to clean up or manage their own files and directories, but it can also be used by system administrators to control access and prevent unwanted modifications or deletions.

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The acronym for DATABASE MANAGEMENT SYSTEM is DBMS, which stands for "Database Management System". A database is an organized collection of data that can be stored, accessed, and managed easily. However, managing large amounts of data can be complicated, which is where a Database Management System comes in. A DBMS is a software system that allows users to create, modify, and manipulate databases. It provides tools to organize and store data efficiently, as well as tools to retrieve and analyze that data. In summary, DBMS is an abbreviation for Database Management System, a software system used to manage and organize data efficiently.

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The correct answer is "Data". Data refers to a collection of facts, figures, or information that can be processed or analyzed to gain insights or make informed decisions. Data can come in different forms, such as numbers, text, images, audio, or video. It can be stored in various formats, including spreadsheets, databases, documents, or files. For example, if you have a list of customer names, addresses, and phone numbers in a spreadsheet, this is considered data. If you store this information in a database, it becomes a structured collection of data that can be easily accessed and manipulated. However, whether the data is sequenced or structured depends on how it is organized, and it is not a defining characteristic of data itself.

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The correct answer is "data conversion." Data conversion refers to the process of changing the format of computer data from one type to another. This may involve converting data from one file format to another, such as converting a document from Microsoft Word format to PDF. It can also involve converting data from one data type to another, such as converting a string of text to a numerical value. Data conversion can be important for many reasons, such as ensuring compatibility between different software programs, preserving data in a usable format over time, and improving the efficiency of data processing. For example, converting data to a more efficient format can reduce the amount of storage space needed, which can be important when dealing with large amounts of data. In summary, data conversion is the process of changing the format or type of computer data to make it usable in different contexts or more efficient to process.

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"Joy stick" is not a type of computer application. A computer application, also known as an application or app, is a program that runs on a computer and provides a specific set of functions for the user to perform. Examples of computer applications include Microsoft Word for word processing, Firefox for web browsing, and VLC media player for playing audio and video files. A joy stick, on the other hand, is a device used to control movement in computer games or simulations. It typically consists of a stick that can be moved in different directions to control the movement of an object on the screen. Joy sticks are not considered applications because they do not provide specific functions like a word processor or media player, but rather serve as input devices for other applications.

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The explorer bar is divided into several categories. The exact number of categories can vary depending on the software and version you are using. The categories typically include items such as "File & Folders", "Search", "History", and "Favorites". The explorer bar provides a user-friendly interface for navigating and accessing different areas of your computer or device, and the categories help to organize and categorize the different types of information and resources that are available. The explorer bar is a common feature in many operating systems, including Microsoft Windows, and is used for accessing and managing files, folders, and other resources on your computer.

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The permanent memory that has data and instructions to start up the computer and does not erase data after power off is called ROM (Read-Only Memory). ROM is a type of computer memory that is pre-programmed with data and instructions during manufacturing. This means that once the data and instructions are written into ROM, they cannot be changed or erased, hence the name "read-only". When you turn on your computer, the CPU (central processing unit) looks to the ROM for the instructions on how to boot up the computer. These instructions include basic input/output system (BIOS) code that checks the hardware components to make sure they are working properly, and then loads the operating system from the hard drive or another storage device. The data and instructions stored in ROM are not affected by power outages or restarts, meaning that they are retained even when the computer is turned off. This is why ROM is called non-volatile memory. In summary, ROM is a type of permanent memory that contains data and instructions to start up a computer and does not lose this information when the computer is turned off.

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The most basic network is a Personal Area Network or PAN. A PAN is a network that connects devices located within a relatively small area, typically within a person's personal space. This can include devices like smartphones, tablets, laptops, and other wearable devices. A PAN can be created using different types of technologies like Bluetooth or Wi-Fi, which allow devices to communicate with each other and share resources such as files, internet connection, and printers, among others. For example, if you have a smartphone and a wireless headset, you can create a PAN by connecting your phone to the headset via Bluetooth. This allows you to make and receive phone calls hands-free. In summary, a PAN is the most basic network as it connects devices within a small personal area and is easy to set up and use. It is the foundation upon which larger and more complex networks like LAN, WAN, and MAN are built.

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The test used to determine if a computer has the ability to think is called the Turing test. The Turing test was proposed by the mathematician and computer scientist Alan Turing as a way to determine if a machine can exhibit intelligent behavior equivalent to, or indistinguishable from, that of a human. The test involves a human evaluator who engages in a natural language conversation with a machine and a human, without knowing which is which, and tries to determine which is the machine based on their responses. If the evaluator is unable to reliably distinguish the machine from the human, the machine is said to have passed the Turing test and demonstrated human-like intelligence.

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Sensitive data can be protected from prying eyes using encryption. Encryption is the process of converting data into a code or a form that cannot be easily understood without a special key or password. When data is encrypted, it is scrambled and transformed into a form that is not easily recognizable. The only way to unlock or decrypt the data is to have the specific key or password that was used to encrypt it. This means that even if someone gains unauthorized access to the encrypted data, they will not be able to read or understand it without the key or password. Encryption can be applied to many types of sensitive data, including passwords, financial information, personal data, and sensitive documents. It can be used to protect data both while it is being transmitted (e.g., through email or messaging) and while it is being stored (e.g., on a computer or server). In summary, encryption is a powerful tool for protecting sensitive data from prying eyes, by converting it into a code or a form that is not easily recognizable without the specific key or password that was used to encrypt it.

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The arrow displayed on the screen of a computer is called a "Cursor". The cursor is a graphical representation of the position where text or data can be inserted or edited on the computer screen. It is typically displayed as a blinking vertical line, a block or a underline depending on the type of application or software being used. The cursor can be moved around the screen using the computer mouse, touchpad, or keyboard keys. When the cursor is moved, the text or data following it also moves accordingly. The term "pointer" can also refer to the arrow displayed on the screen, but it is a more general term that can refer to any graphical element used to indicate a position or selection on the screen. The term "indicator" is less commonly used and generally refers to a specific type of visual cue used to provide information to the user.

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The Caps key on a keyboard is used to switch between upper and lower case letters. When you press the Caps key, it changes the letter case of the letters you type from lowercase to uppercase or vice versa. This means that if you type with the Caps key on, all the letters you type will appear in uppercase. Similarly, if you type with the Caps key off, all the letters you type will appear in lowercase. This feature is particularly useful when you want to emphasize certain words or phrases, such as in titles or headings. It can also be used to make your text easier to read by adding some variety to the letter case. For example, when typing a password or other sensitive information, you may want to use a combination of upper and lower case letters to make it more secure. In summary, the Caps key is used to switch between uppercase and lowercase letters in order to make text easier to read, emphasize words, or add security to sensitive information.

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CPU stands for Central Processing Unit. It is the primary component of a computer system that carries out instructions of a computer program. The CPU is often referred to as the "brain" of the computer, as it performs the majority of the calculations and operations that are necessary for the computer to function. The CPU is responsible for fetching instructions from the computer's memory, decoding those instructions, executing them, and then storing the results back in memory. It is made up of several sub-components, including the arithmetic logic unit (ALU) which performs mathematical operations, and the control unit (CU) which manages the flow of data and instructions within the CPU and to other parts of the computer system.

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The joystick typically has a button on top, used to select the option pointed by the cursor. A joystick is an input device that allows a user to control the movement of a cursor on a screen or to interact with a virtual environment or game. The joystick typically has a stick or lever that can be moved in different directions to control the movement of the cursor. The button on the top of the joystick is used to select the option that the cursor is pointing to on the screen. This button is commonly referred to as the "trigger" button, and it allows the user to perform actions such as selecting a menu option, firing a weapon in a game, or interacting with objects in a virtual environment. Overall, the joystick and its trigger button provide a simple and intuitive way for users to interact with software and games, making them a popular input device for a wide range of applications.

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The logical structure of a database can be depicted through its data model. A data model is a conceptual representation of data and the relationships between data elements in a database. It defines the structure of the database, including tables, columns, and the relationships between them. The data model can be thought of as a blueprint or a map for the database, showing how data is organized and how it can be accessed. It is an abstract representation of the database, separate from the specific software or hardware used to implement it. By using a data model, designers and developers can ensure that the database is structured in a logical and consistent way, which can improve performance, scalability, and ease of use.

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The stage of system development cycle that is not commonly considered is "Observation". The typical stages of the system development cycle are planning, analysis, design, implementation, and testing. During the planning stage, the requirements and objectives of the system are identified. In the analysis stage, the requirements are studied in detail, and the feasibility of the system is determined. The design stage involves creating a blueprint for the system, including its architecture, interfaces, and data structures. During implementation, the system is built and the design is turned into a working system. Testing involves checking the system's performance and identifying any errors or bugs that need to be fixed. Observation is not usually considered a distinct stage in the system development cycle, but it can be seen as a part of testing or implementation. Observation involves monitoring the system after it has been implemented to ensure that it is working as intended and to identify any issues that need to be addressed.