All Free Computer Science and IT MCQs with Answers

251. Who is the Current CEO of Microsoft?

• A. Babbage
• B. Bill Gates
• C. Bill Clinton
• D. Satya Nadella

Explanation: Satya Nadella is Microsoft's current CEO, having succeeded Steve Ballmer in 2014. Bill Gates co-founded Microsoft but is not its current chief executive.

252. DOS stands for____________?

• A. Disk Operating System
• B. Disk operating session
• C. Digital Operating System
• D. Digital Open system

Explanation: DOS stands for Disk Operating System, an operating system family that manages disk-based files and programs. The alternatives expand the abbreviation incorrectly.

253. A self replicating program, similar to a virus which was taken from a 1970s science fiction novel by John Bruner entitled the Shockwave Rider is__________?

• A. Bug
• B. Vice
• C. Lice
• D. Worm

Explanation: A worm is a self-replicating program that can spread between systems without needing to attach to another program. The term was popularised by John Brunner's 1975 science-fiction novel The Shockwave Rider.

254. What is meant by a dedicated computer?

• A. Which is used by one person only
• B. Which is assigned one and only one task
• C. Which uses one kind of software
• D. Which is meant for application software

Explanation: A dedicated computer is designed for one specific task or limited purpose, such as controlling a washing machine or traffic signal. It does not mean that only one person can use it.

255. Modern Computer are very reliable but they are not___________?

• A. Fast
• B. Powerful
• C. Infallible
• D. Cheap

Explanation: Computers are highly reliable and fast, but they are not infallible because hardware failures, software bugs and incorrect input can still produce errors. Infallible means incapable of making a mistake.

256. Personnel who design, program, operate and maintain computer equipment refers to__________?

• A. Console-operator
• B. Programmer
• C. Peopleware
• D. System Analyst

Explanation: Peopleware refers to the people who design, program, operate and maintain computer systems. A programmer and a system analyst are specific roles within this broader group.

257. Who designed the first electronics computer - ENIAC?

• A. Van-Neumann
• B. Joseph M. Jacquard
• C. J. Presper Eckert and John W Mauchly
• D. All of above

Explanation: ENIAC was designed by J. Presper Eckert and John W. Mauchly. Von Neumann later contributed to the stored-program design concept, but he did not design ENIAC with the two named engineers.

258. In latest generation computers, the instructions are executed___________?

• A. Parallel only
• B. Sequentially only
• C. Both sequentially and parallel
• D. All of above

Explanation: Modern processors use sequential execution for ordered instructions and parallel execution through multiple cores, pipelines and other techniques. Therefore, both modes are used, not either one exclusively.

259. In analogue computer_____________?

• A. Input is first converted to digital form
• B. Input is never converted to digital form
• C. Output is displayed in digital form
• D. All of above

Explanation: An analogue computer works with continuously varying physical values, so its input is handled in analogue form rather than first being converted to digital form. Digital conversion is characteristic of digital or hybrid processing.

260. Microprocessors as switching devices are for ___________generation computers?

• A. First Generation
• B. Second Generation
• C. Third Generation
• D. Fourth Generation

Explanation: Fourth-generation computers introduced microprocessors, which placed the central processing unit on a single chip. Earlier generations used vacuum tubes, transistors or integrated circuits.