All Free Computer Science and IT MCQs with Answers

441. Personal computers use a number of chips mounted on a main circuit board. What is the common name for such boards?

• A. Daughter board
• B. Motherboard
• C. Father board
• D. Breadboard

Explanation: The main circuit board that connects a personal computer's processor, memory and other components is called the motherboard. A daughterboard is an expansion board connected to a main board.

442. The output quality of a printer is measured by____________?

• A. Dot per inch
• B. Dot per sq. inch
• C. Dots printed per unit time
• D. All of above

Explanation: Printer resolution, an important measure of output quality, is commonly expressed in dots per inch, or DPI. Dots per unit time measures printing speed rather than resolution.

443. Which of the following devices can be used to directly image printed text?

• A. OCR
• B. OMR
• C. MICR
• D. All of above

Explanation: OCR, or Optical Character Recognition, converts the shapes of printed characters in an image into editable text. OMR reads marked areas, while MICR reads magnetised characters used mainly on bank cheques.

444. Which of the following is a storage device?

• A. Tape
• B. Hard Disk
• C. Floppy Disk
• D. All of the above

Explanation: Magnetic tape, hard disks and floppy disks are all secondary storage devices used to retain data. Therefore, the inclusive option is correct.

445. What does DMA stand for?

• A. Distinct Memory Access
• B. Direct Memory Access
• C. Direct Module Access
• D. Direct Memory Allocation

Explanation: DMA stands for Direct Memory Access, a technique that lets an I/O device transfer data directly to or from main memory with limited processor involvement. This improves transfer efficiency.

446. Which of the following is not anti- viruses software?

• A. Avira
• B. Kaspersky
• C. Oracle
• D. McAfee

Explanation: Avira, Kaspersky and McAfee are antivirus products, whereas Oracle is primarily known for database software and related enterprise products. It is therefore not the antivirus option here.

447. What do you call the programs that are used to find out possible faults and their causes?

• A. operating system extensions
• B. cookies
• C. diagnostic software
• D. boot diskettes

Explanation: Diagnostic software tests a computer or its components to detect faults and help identify their causes. Cookies store website-related data and boot diskettes mainly help start a system.

448. What characteristic of read-only memory (ROM) makes it useful?

• A. ROM information can be easily updated.
• B. Data in ROM is non-volatile, that is, it remains there even without electrical power.
• C. ROM provides very large amounts of inexpensive data storage.
• D. ROM chips are easily swapped between different brands of computers.Exploring Educational Science Kits

Explanation: ROM is non-volatile memory, so its contents remain stored when electrical power is removed. It is not intended for easy updating and does not provide large, inexpensive storage like a disk.

449. A computer cannot 'boot' if it does not have the__________?

• A. Compiler
• B. Loader
• C. Operating System
• D. Assembler

Explanation: In the conventional desktop-computer sense, booting loads the operating system so it can manage hardware and run applications. A machine may technically start firmware without an operating system, but it cannot complete a normal operating-system boot.

450. Which of the following is a part of the Central Processing Unit?

• A. Printer
• B. Key board
• C. Mouse
• D. Arithmetic & Logic unit

Explanation: The Arithmetic and Logic Unit is a CPU component that performs calculations and logical comparisons. A printer, keyboard, and mouse are peripheral devices, not parts of the CPU.