All Free Computer Science and IT MCQs with Answers

321. Which of the following does computing in a personal computer?

• A. CPU
• B. Motherboard
• C. RAM
• D. BIOS

Explanation: The CPU performs arithmetic, logical and control operations, so it is the component that carries out computing in a personal computer. RAM stores working data, while the motherboard connects components and BIOS starts hardware initialization.

322. RAID stands for:

• A. Redundant Array of Independent Disks
• B. Redundant Array of Independent Device
• C. Redundant Array of Independent Division
• D. None of these

Explanation: RAID means Redundant Array of Independent Disks, a method of combining multiple disks for improved performance, fault tolerance or both. “Device” and “Division” are not part of the standard expansion.

323. Which of the following is used as "Input device" for the computer?

• A. VDU
• B. TV
• C. Printer
• D. Light pen

Explanation: A light pen is an input device that lets the user select or draw directly on a compatible display. A VDU and printer are output devices, while a TV is not normally a computer input device.

324. Which of the following device uses the parallel transmission?

• A. Mouse
• B. Keyboard
• C. Printer
• D. Light Pen

Explanation: Traditional printers commonly used parallel transmission, sending several bits simultaneously over separate lines. Mouse, keyboard and light pen connections are conventionally treated as serial transmission in this type of question.

325. Who was the inventor of mouse?

• A. Douglas Engelbart
• B. Ada Lovelace
• C. Charles Babbage
• D. None of these

Explanation: Douglas Engelbart invented the first computer mouse prototype in the 1960s. Ada Lovelace and Charles Babbage are associated with early programming and computing concepts, not the mouse.

326. When was the first IBM microcomputer called IBM with 16-bit microprocessor introduced?

• A. 1979
• B. 1981
• C. 1982
• D. 1984Spreadsheet Software

Explanation: IBM introduced the IBM PC in 1981, using Intel's 16-bit 8088 microprocessor. The 1979, 1982, and 1984 dates do not match the original IBM PC introduction.

327. Which is the place that is used to connect various external devices to the computer?

• A. Circuit
• B. Whole
• C. Port
• D. None of these

Explanation: A port is a physical connection point used to attach peripherals such as keyboards, printers, displays, and external drives. A circuit is an electronic pathway, not the standard connector for external devices.

328. Which one is a Program of Operating System that carries your Data?

• A. BIOS
• B. ROM
• C. Loader
• D. Processor

Explanation: A loader is system software that loads the operating system or programs into main memory so they can run. BIOS and ROM are firmware or memory components, while the processor is hardware.

329. Loading of Operating System in Personal Computer is called?

• A. Processing
• B. Installation
• C. Booting
• D. None of these

Explanation: Booting is the process of loading the operating system into memory when a computer starts or restarts. Installation means placing the operating system on storage, which is a different process.

330. Parallel Port is called?

• A. Male Connector
• B. Female Connector
• C. Joint Connector
• D. None of these

Explanation: The traditional parallel port on a computer is a female connector, while the cable plug is normally male. This distinction refers to the physical shape of the connector, not its data direction.