All Free Computer Science and IT MCQs with Answers

301. CD-ROM stands for____________?

• A. Compactable Read Only Memory
• B. Compact Data Read Only Memory
• C. Compactable Disk Read Only Memory
• D. Compact Disk Read Only Memory

Explanation: CD-ROM means Compact Disc Read-Only Memory, an optical medium whose stored data is normally not writable. Option d uses the common but technically less precise spelling Disk.

302. Which of the following are components of Central Processing Unit (CPU) ?

• A. Arithmetic logic unit, Mouse
• B. Arithmetic logic unit, Control unit
• C. Arithmetic logic unit, Integrated Circuits
• D. Control Unit, Monitor

Explanation: The CPU contains the Arithmetic Logic Unit, which performs calculations and comparisons, and the Control Unit, which directs instruction execution. A mouse and monitor are peripheral devices, not CPU components.

303. Which technology is used in compact disks?

• A. Mechanical
• B. Electrical
• C. Electro Magnetic
• D. Laser

Explanation: Compact discs store and read data using a laser beam that detects microscopic pits and lands on the disc surface. Mechanical and ordinary electrical technologies do not perform this optical reading process.

304. What type of operating system MS-DOS is?

• A. Command Line Interface
• B. Graphical User Interface
• C. Multitasking
• D. Menu Driven Interface

Explanation: MS-DOS is primarily a command-line operating system, in which users enter text commands to perform tasks. It does not natively provide the graphical interface associated with systems such as Windows.

305. A collection of system programs that controls and co-ordinates the overall operations of a computer system is called____________?

• A. System software
• B. Operating system
• C. Utility program
• D. Device driver

Explanation: An operating system is the system software that manages hardware, runs application programs, and coordinates overall computer operations. Utility programs and device drivers perform narrower supporting roles.

306. Which is an item of storage medium in the form of circular plate?

• A. Disk
• B. CPU
• C. Printer
• D. ALU

Explanation: A disk is a circular storage medium, such as a hard disk platter or optical disc. The CPU and ALU process data, while a printer produces output.

307. In microprocessor terminology, what does DMA stand for?

• A. Direct Memory Access
• B. Direct Module Access
• C. Direct Memory Allocation
• D. None of These

Explanation: DMA means Direct Memory Access, allowing an input/output device to transfer data directly to or from memory with limited CPU involvement. This improves efficiency during high-volume data transfers.

308. A light sensitive device that converts drawing, printed text or other images into digital form is___________?

• A. Keyboard
• B. Scanner
• C. OMR
• D. None of these

Explanation: A scanner uses light to read printed text, drawings, or images and convert them into digital data. An OMR reads marked responses on specially designed forms rather than general images.

309. Who Invented the First Computer Mouse?

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

Explanation: Douglas Engelbart invented the first computer mouse and demonstrated it in 1968. Ada Lovelace and Charles Babbage were important pioneers of computing but did not invent the mouse.

310. The first completely 64-bit compatible version of Android was____?

• A. Android 4.0 Ice Cream Sandwich
• B. Android 5.0 Lollipop
• C. Android 3.0 Honeycomb
• D. Android 2.3 Gingerbread

Explanation: Android 5.0 Lollipop was the first Android release with full 64-bit support, allowing Android devices to use 64-bit processors and applications. Earlier listed versions were primarily 32-bit.