All Free Computer Science and IT MCQs with Answers

351. Which of the following Key is not found in normal computers / laptops?

• A. Turn key
• B. Alt key
• C. del key
• D. shift key

Explanation: A Turn key is not a standard key on ordinary computer keyboards, whereas Alt, Delete, and Shift are common keys. The wording likely refers to “Turn” as a nonexistent keyboard key.

352. Choose the best option : An anti virus program is designed to ___________ computer virus.

• A. Identify and eliminate
• B. Scan device and identify
• C. Scan device, identify and eliminate
• D. Scan device and eliminate

Explanation: Antivirus software scans a device, identifies malicious programs and removes or neutralises them. Identification alone would not complete the primary protective task.

353. The top most row of keys on the standard keyboard contains__________keys, and the longest key on the keyboard is ____________ ?

• A. Alphabetic, space bar
• B. Number, enter key
• C. Function, enter key
• D. Function, space bar

Explanation: The top row contains the function keys, such as F1 through F12, while the space bar is generally the keyboard's longest key. The Enter key is not normally longer than the space bar.

354. What is windows registry?

• A. Windows register to store clipboard
• B. The Windows Registry is a hierarchical database that stores low-level settings for OS
• C. Microsoft program to enable or disable a particular function
• D. An application to edit the system configuration

Explanation: The Windows Registry is a hierarchical database containing operating-system and application configuration settings. It is not merely a clipboard store or an ordinary configuration-editing application.

355. What is the capacity of a two sided DVD?

• A. 8.8 GB
• B. 9.2 GB
• C. 10 GB
• D. 9.4 GB

Explanation: A standard double-sided, single-layer DVD, known as DVD-10, stores about 9.4 GB. Higher-capacity double-sided dual-layer DVDs are a different format.

356. Macintosh, a personal computer was developed by________?

• A. Microsoft
• B. IBM
• C. Apple
• D. Dell

Explanation: The Macintosh personal computer was developed and marketed by Apple. Microsoft, IBM, and Dell produced other computer products but did not develop the Macintosh.

357. Communication between a computer and a keyboard involves ______________ transmission.

• A. Automatic
• B. Half-duplex
• C. Full-duplex
• D. Simplex

Explanation: A keyboard sends input signals to the computer, while the computer does not normally send data back through that communication channel. This one-way transmission is simplex.

358. Vendor-created program modifications are called ________ ?

• A. patches
• B. fixes
• C. antiviruses
• D. holes

Explanation: Patches are updates or modifications supplied by a software vendor to correct errors, improve security or add minor changes. Fixes is a general term, while holes are vulnerabilities rather than modifications.

359. When was MS Windows operating system introduced?

• A. 1975
• B. 1985
• C. 1990
• D. 2000Windows OS

Explanation: The first retail version of Microsoft Windows, Windows 1.0, was released in 1985. Later years refer to subsequent Windows versions, not its introduction.

360. The keys on the top of keyboard as F1, F2.........F12 are called_________?

• A. Enter keys
• B. Lock keys
• C. Insert keys
• D. Function keys

Explanation: F1 through F12 are called function keys because they perform commands assigned by the operating system or application. Lock keys include Caps Lock and Num Lock.