Online Computer Knowledge Test By Bapi

A modem is connected to a telephone line because it is a device that allows computers to connect to the internet using a telephone line. The modem converts the digital signals from the computer into analog signals that can be transmitted over the telephone line, and vice versa. This enables the computer to send and receive data over the internet through the telephone line connection.

The correct answer is "World Wide Web." The term "WWW" stands for World Wide Web, which is a system of interconnected documents and other resources, linked by hyperlinks and URLs. It is a global information space where users can access and share information through websites using internet browsers. The World Wide Web revolutionized the way people communicate, access information, and conduct business online.

A computer virus is a type of malicious software that is designed to replicate itself and spread from one computer to another without the knowledge or consent of the user. It can cause harm to the infected computer by corrupting files, stealing personal information, or disrupting the normal functioning of the system. Therefore, the correct answer is "a computer programme" as it accurately describes the nature and purpose of a computer virus.

The main directory of a disk is called the root directory. This is the top-level directory that contains all other directories and files on the disk. It serves as the starting point for navigating and organizing the file system hierarchy.

The CPU is responsible for performing arithmetic calculations, managing memory, and managing input and output. However, the graphical display of data is not a function typically performed by the CPU. This task is usually handled by the graphics processing unit (GPU) or dedicated graphics hardware.

Compilers and translators are software programs used in computer systems. They are responsible for converting high-level programming languages into machine code that can be understood and executed by the computer's hardware. These programs play a crucial role in the development and execution of software applications. Therefore, the correct answer is software.

The correct answer is "Valves." The first generation computers, also known as vacuum tube computers, used valves as their primary hardware component. Valves were large, fragile, and consumed a lot of power. They functioned as electronic switches, allowing the flow of electricity to be controlled and creating the binary logic necessary for computing. However, valves were eventually replaced by transistors in later generations of computers due to their size, power consumption, and reliability issues.

A dot matrix printer would be used to prepare a hard copy. Dot matrix printers use a series of small pins to strike an ink ribbon, creating dots on the paper to form characters and images. This type of printer is commonly used for printing documents that require multiple copies, such as invoices or receipts. It is a reliable and cost-effective option for producing hard copies.

Charles Babbage is known for his invention of the Difference Engine, not the Different Engine. The Difference Engine was a mechanical calculator designed to automatically calculate and print mathematical tables. Babbage's invention laid the foundation for modern computers and is considered a precursor to the electronic computer. Therefore, the correct answer is "None of the Above" as none of the options listed accurately describe Charles Babbage's invention.

A printer is considered a secondary device because it is not directly involved in the processing of data. It is used to produce hard copies of documents or images that have been processed by the computer. Unlike primary devices such as the ALU (Arithmetic Logic Unit) which performs calculations and the keyboard and mouse which input data, the printer is used for outputting data. Therefore, it is categorized as a secondary device.