Computer History Practice Questions! Quiz

The correct answer is "Accepts data and processes it." This answer accurately describes the main function of a computer. Computers are designed to receive input in the form of data and then perform operations on that data through various processing techniques. This process allows computers to analyze, manipulate, and store information, making them powerful tools for a wide range of tasks and applications. The other options listed, such as listing instructions, sliding beads, and punching holes in cards, do not accurately represent the core function of a computer.

Computers use binary numbers because they can only understand ones and zeros. Binary is a base-2 number system that uses only two digits, 0 and 1, to represent all information. This is because computer processors are built using electronic circuits that can only distinguish between two voltage levels, on and off. By using binary, computers can efficiently process and store data in a way that is compatible with their hardware design.

The central processing unit (CPU) is the device that directs all the activities of a computer. It is often referred to as the "brain" of the computer because it performs all the necessary calculations and executes instructions. The CPU is responsible for fetching, decoding, and executing instructions, as well as managing and coordinating the various components and devices of the computer system. It controls the flow of data between the different parts of the computer and ensures that all tasks are carried out efficiently and in the correct order.

Computer software refers to the programs that are designed to instruct and guide the computer in performing specific tasks. It encompasses a wide range of applications, utilities, and operating systems that enable the computer to function effectively. The correct answer, "Programs that tell the computer what to do," accurately describes the role of software in providing instructions and commands to the computer, allowing it to execute various operations and tasks.

A computer can make decisions because it is programmed with complex algorithms and has the ability to process and analyze data, allowing it to execute different actions based on specific conditions. On the other hand, a calculator is designed to perform simple mathematical calculations and does not have the capability to make decisions or perform complex tasks beyond its basic functions.

A network is a system that connects computers together so that they can communicate and share information with each other. This allows for the transmission of data between the connected computers, enabling them to work together and exchange information efficiently.

The correct answer includes the components that are physical devices used to interact with a computer system. A mouse is a hardware component used for pointing and clicking, a keyboard is a hardware component used for inputting text and commands, and a monitor is a hardware component used for displaying visual output. These components can be physically touched and are essential for the functioning of a computer system.

The number system that is widely used today is the Arabic numeral system. This system originated in India and was later adopted by the Arab mathematicians, who introduced it to the Western world. The Arabic numeral system uses ten digits (0-9) and a place value system, allowing for efficient representation of numbers. It is the system used in most countries around the world for mathematical operations and everyday counting.

Random access memory (RAM) is a type of computer memory that allows data to be both read and written. It is a volatile memory, meaning that its contents are lost when the computer is turned off. RAM is used by the computer to store data that is actively being used by the CPU, allowing for quick and efficient access to information. Unlike read-only memory (ROM), which can only be read, RAM provides the computer with the ability to both retrieve and modify data, making it an essential component for the functioning of a computer system.