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When buying a computer, it is important to consider all of the factors mentioned - size of the RAM, speed of the CPU, and size of the hard disk. The size of the RAM determines the computer's ability to handle multiple tasks and run applications smoothly. The speed of the CPU affects the computer's processing power and how quickly it can execute tasks. The size of the hard disk determines the amount of storage space available for files, documents, and software. Considering all of these factors ensures that you make an informed decision and choose a computer that meets your requirements.

The most common input hardware for personal computers are the mouse and keyboard. These devices allow users to interact with the computer by inputting commands and data. The mouse is used to navigate and select items on the screen, while the keyboard is used for typing and entering text. Together, they provide a convenient and efficient way for users to interact with their computers.

The correct answer is A+C because the information must be available at the right time and useful, and it should have good accuracy. This means that in order for information to be effective, it needs to be both timely and accurate. If information is not available when it is needed or if it is not accurate, it can lead to incorrect decision-making or ineffective actions. Therefore, having information that is both timely and accurate is crucial for it to be useful.

The computer is a combination of hardware and software, meaning it consists of electronic circuits and devices that make up its physical components, as well as the intelligent machine that can process information and perform tasks. Therefore, the correct answer is "all of the above" as it encompasses all the given options.

ALU stands for Arithmetic Logic Unit, which is a component of a computer's central processing unit (CPU). The ALU is responsible for performing arithmetic operations, such as addition, subtraction, multiplication, and division, as well as logical operations, such as AND, OR, and NOT. These operations are essential for carrying out mathematical calculations and logical comparisons in a computer system. Therefore, the correct answer is "arithmetic & logical operations."

CD-ROM stands for "computer disk read only memory". This is a type of storage medium that can store large amounts of data, such as software, audio, and video files. The term "read only memory" indicates that the data on a CD-ROM cannot be modified or erased, making it a non-volatile storage solution. The term "computer disk" refers to the physical disc that is inserted into a CD-ROM drive for reading the data stored on it.

A byte is a unit of digital information that consists of 8 bits. Each bit can represent a value of 0 or 1, and when combined, they form a byte. Therefore, the correct answer is 8, as it represents the number of bits in a byte.

The correct answer is the CPU and the memory. The system unit is the main part of a computer that houses all the essential components. The CPU (Central Processing Unit) is responsible for executing instructions and performing calculations, while the memory stores data and instructions that the CPU needs to access quickly. Together, the CPU and memory form the core components of the system unit, enabling the computer to perform tasks and run programs efficiently.

Data refers to the raw facts, figures, and statistics that are collected and stored. It is the basic building block of information and is processed and analyzed to generate meaningful insights. Data can be in various forms such as numbers, text, images, or videos. Therefore, data is the correct answer as it is the raw material used to create information.

The input unit refers to the devices that allow users to input data into the computer system. This includes devices like the mouse, keyboard, and scanner. However, the printer is an output device that allows the computer to produce hard copies of data or documents. Therefore, the printer is not an example of an input unit.

The word "SUMMER" consists of 6 characters. In computer memory, each character is typically stored using 8 bits (1 byte). Therefore, to store the word "SUMMER" in computer memory, we would need 6 characters * 8 bits/character = 48 bits.

RAM stands for Random Access Memory. It is a type of temporary, volatile storage that is used by a computer to store data that is currently being used or processed. Unlike ROM (Read-Only Memory), RAM can be both read from and written to by the computer's processor. It is called volatile because its contents are lost when the computer is powered off or restarted. RAM is an essential component in a computer system as it allows for quick access to data, which improves the overall performance and efficiency of the system.

The given answer is "hardware" because mouse, keyboard, monitor, and system unit are all physical components of a computer system. Hardware refers to the tangible parts of a computer that can be seen and touched, as opposed to software which refers to the programs and instructions that run on the computer. Therefore, "hardware" is the correct term to describe these components.

Microcomputers are divided into two general categories: portable and desktop. This categorization is based on the mobility of the computer. Portable microcomputers are designed to be easily carried and used on the go, while desktop microcomputers are intended to remain stationary on a desk or table. This division allows for different use cases and preferences, with portable computers being convenient for travel and on-the-go work, and desktop computers providing more power and stability for intensive tasks.

Floppy disk, optical disk DVD, and hard drives are considered examples of secondary storage because they are used to store data and information for long-term use. Unlike primary storage, which includes RAM and cache memory, secondary storage devices retain data even when the power is turned off. These storage devices are typically used to store large amounts of data that can be accessed and retrieved as needed.

The correct answer is "central processing unit". The CPU is the primary component of a computer that performs most of the processing inside the computer. It is responsible for executing instructions, performing calculations, and managing data flow between different parts of the computer system. The CPU is often considered the "brain" of the computer, as it controls and coordinates all other hardware components.

RAM (Random Access Memory) is a type of computer memory that is used by the processor to store and access data quickly. It is a volatile memory, meaning that its contents are lost when the computer is powered off. RAM is used to temporarily store data and instructions that the processor needs to access frequently. It provides faster access to data compared to other storage devices like disks, which have slower read and write speeds. Therefore, all the information used by the processor is loaded first into RAM for quick and efficient access.

A computer virus has the ability to link itself to another program, meaning it can attach itself to a legitimate program and spread when that program is executed. This allows the virus to hide and propagate, making it more difficult to detect and remove. By linking itself to other programs, the virus can infect multiple files and systems, causing damage or stealing information.

RAM (Random Access Memory) is a hardware component of a computer system. It is a type of computer memory that is used to store data that is being actively used by the computer's operating system, software programs, and applications. It provides temporary storage for data and instructions that are necessary for the computer to perform its tasks efficiently. Therefore, the correct answer is hardware.

The main memory is a combination of RAM, ROM, and the hard disk. It can be both temporary and permanent storage. It is used to store user programs and data while they are running. Therefore, the correct answer is B+C, which means that the main memory is both temporary and permanent and is used to store user programs and data while running.

A microcomputer is the most widely used type of computer because it is small, affordable, and easily accessible to individuals and businesses. It is designed for personal use and can perform a wide range of tasks such as word processing, internet browsing, and multimedia applications. Microcomputers are commonly found in homes, offices, and schools, making them the most popular choice among computer users. Supercomputers, minicomputers, and mainframes, on the other hand, are specialized and typically used for complex scientific calculations, large-scale data processing, and high-performance computing, making them less commonly used compared to microcomputers.

System software is the correct answer because it is responsible for managing and controlling the computer system. It provides a platform for other software to run on and acts as an intermediary between the user programs and the computer hardware. System software includes operating systems, device drivers, and utility programs that help in the smooth functioning of the computer. Application software refers to programs designed for specific tasks, while operation software is not a commonly used term in the context of software.

The given correct answer states that the sound blaster is an output unit only. This means that the sound blaster is designed to produce sound and send it to external devices such as speakers or headphones. It does not have the capability to receive or record sound from external sources, making it solely an output device.

The CPU (Central Processing Unit) is the main component of a computer that performs most of the processing inside the computer. It consists of three main parts: ALU (Arithmetic Logic Unit), CU (Control Unit), and register.

The ALU is responsible for performing arithmetic and logical operations, such as addition, subtraction, and comparison. The CU manages and coordinates the activities of the CPU, including fetching instructions from memory and executing them. The register is a small, high-speed storage area used to hold data that the CPU is currently working on.

Therefore, the correct answer is ALU, CU, and register as these three components are essential for the functioning of the CPU.

The term "end user" refers to individuals who utilize computers to perform information processing tasks. This means that they are the ones who actively engage with the computer systems to input, process, and retrieve data or information. They are not involved in writing software or creating computer programs, but rather rely on the output or end product generated by computers to fulfill their tasks or objectives.