All Free Computer Science and IT MCQs with Answers

421. A DVD is an example of a (n)___________?

• A. hard disk
• B. optical disc
• C. output device
• D. solid-state storage device

Explanation: A DVD stores data using laser-read pits on a disc, so it is an optical disc. It is not a hard disk, printer-like output device, or solid-state storage.

422. Reusable optical storage will typically have the acronym________?

• A. CD
• B. DVD
• C. ROM
• D. RW

Explanation: RW stands for ReWritable, indicating that an optical disc can be erased and recorded again. CD and DVD identify disc formats, while ROM means read-only memory.

423. Codes consisting of lines of varying widths or lengths that are computer-readable are known as__________?

• A. an ASCII code
• B. a magnetic tape
• C. an OCR scanner
• D. a bar code

Explanation: A barcode represents data through machine-readable lines or patterns of varying widths. ASCII is a character code, and an OCR scanner is a device rather than the code itself.

424. The CPU and memory are located on the__________?

• A. expansion board
• B. motherboard
• C. storage device
• D. output device

Explanation: The motherboard is the main circuit board that houses or connects the CPU, memory, and other components. Expansion boards add specialised functions but do not serve as the computer’s primary board.

425. All of the following are examples of storage devices EXCEPT____________?

• A. hard disk drives
• B. printers
• C. floppy disk drives
• D. CD drives

Explanation: A printer produces a hard copy, so it is an output device rather than a storage device. Hard disks, floppy disks, and CDs or their drives are associated with storing data.

426. Select the Odd one from the following

• A. Operating system
• B. Interpreter
• C. Compiler
• D. Assembler

Explanation: An operating system manages computer resources, whereas an interpreter, compiler, and assembler are language translators. Therefore, the operating system is the odd one out.

427. ___________Store data or information temporarily and pass it on as directed by the control unit?

• A. Address
• B. Register
• C. Number
• D. Memory

Explanation: Registers are very small, fast storage locations inside the CPU that hold data and instructions temporarily while the control unit directs processing. Address, number, and memory are not the specific CPU storage component described.

428. Magnetic disk is an example of____________?

• A. Secondary memory
• B. Primary memory
• C. Main memory
• D. Both (1) and (2)

Explanation: A magnetic disk retains data even when power is removed and is therefore classified as secondary memory. Primary or main memory normally refers to directly accessible internal memory such as RAM.

429. RAM is an example of___________?

• A. Secondary memory
• B. Primary memory
• C. Both A. and B.
• D. none

Explanation: RAM is primary memory because the CPU can access it directly while programs are running. It is volatile, so its contents are lost when power is switched off.

430. ALU and Control Unit jointly known as__________?

• A. RAM
• B. ROM
• C. CPU
• D. PC

Explanation: The arithmetic and logic unit and the control unit are the principal components of the central processing unit. RAM and ROM are types of memory, while PC commonly means personal computer or program counter.