Computer Fundamentals and System Concepts

EDSAC (Electronic Delay Storage Automatic Calculator) was a first-generation computer built at Cambridge University in 1949. It used vacuum tubes and mercury delay lines for memory. The other options are from later generations: IBM-1401 (second generation, transistors), CDC-1604 (third generation, integrated circuits), and ICL-2900 (third generation).

First generation computers (1940s-1950s) used vacuum tubes and valves as their primary electronic components. These tubes were bulky, generated significant heat, and were unreliable. Second generation used transistors, while third generation used integrated circuits. The vacuum tube era defined the foundational computing technology.

First Generation computers (1949-1955) were enormous, often room-sized, because they used vacuum tubes which were bulky and generated significant heat. Each successive generation became progressively smaller with advances in transistor and integrated circuit technology.

The fourth generation of computers (1971-present) is characterized by the use of microprocessors, which integrated thousands of integrated circuits onto a single silicon chip.

UNIVAC (Universal Automatic Computer) was one of the first commercially produced computers, introduced in 1951. It was used primarily for business and data processing applications. 'Array' and 'Unique' are incorrect expansions.

IBM 1401 was introduced in 1959 and used transistor technology, placing it in the Second Generation of computers (1956-1965). First Generation used vacuum tubes, Third Generation used integrated circuits, and Fourth Generation used microprocessors.

The IBM 1401 was the first computer introduced in Nepal in 1971 for use in the census. It was a Second Generation transistor-based computer. The other options (1400, 1402) are not historically accurate for Nepal's first computer.

A complete computer system requires all three components: a Central Processing Unit (CPU) to execute instructions, memory to store data and programs temporarily, and Input/Output units to communicate with external devices and users. All components work together to function as a computer.

A spreadsheet is an application program that allows users to change numbers and immediately see the results of those changes through automatic recalculation. When you modify a cell value, all dependent formulas update instantly. This what-if analysis capability is the defining feature of spreadsheets like Excel or Google Sheets.

1975 is cited as the year when chips were first used inside computers, referring to the period when microprocessors began to be widely adopted in personal computers. The Altair 8800 (using Intel 8080) was released in 1975, marking the beginning of the personal computer revolution. This year represents the transition from discrete logic to integrated microprocessor-based designs.

The CPU consists of three main components: the Control Unit (CU) which directs operations, the Arithmetic Logic Unit (ALU) which performs mathematical and logical operations, and Registers. Of the options given, only 'Control unit and ALU' correctly identifies two of these core components.

Buses are sets of parallel electrical conducting lines on a motherboard that connect different components like CPU, memory, and peripherals, allowing data and control signals to flow between them. Conductors is a general term, connectors are physical interfaces, and 'consecutives' is not a technical term.

The four main data processing functions are typically: input (gathering), processing, output, and storage. 'Analyzing the data or information' is not considered one of the core four functions - it's an advanced step beyond basic processing. Gathering, processing into information, and storing are all fundamental operations.

Computers fundamentally operate on data - they process, store, and manipulate data in various forms. While 'information' is conceptually related, 'data' is the technically correct term for what computers actually process (binary digits). Floppies are storage media, not what computers operate on, and 'word' refers to a fixed-size unit of data rather than what computers process broadly.

Computer instructions and memory addresses are represented using binary codes (sequences of 0s and 1s). Binary is the fundamental language of digital computers. Character codes represent characters, parity bits are for error detection, and 'binary word' is not standard terminology in this context.