All Free Computer Science and IT MCQs with Answers

241. Which of the following are the functions of a operating system?

• A. Allocates resources
• B. Monitors Activities
• C. Manages disks and files
• D. All of the above

Explanation: An operating system allocates hardware resources, monitors system activities, and manages disks and files. Since all three are OS functions, the combined option is correct.

242. RAM can be treated as the____________for the computer's processor?

• A. factory
• B. operating room
• C. waiting room
• D. planning room

Explanation: RAM acts like a waiting room because it temporarily holds programs and data that the processor is about to use. It provides fast access, unlike long-term storage.

243. Data becomes____________when it is presented in a format that people can understand and use.

• A. processed
• B. graphs
• C. information
• D. presentation

Explanation: Raw data becomes information after it is processed and presented in a meaningful, usable form. Graphs and presentations are formats that may display information, not the result itself.

244. ___________is the key we use to run the selected command?

• A. SHIFT
• B. TAB
• C. ENTER
• D. CTRL

Explanation: Enter confirms or runs a selected command, submits a choice, and often activates the focused button. Tab only moves the focus, while Shift and Ctrl modify other keys or actions.

245. ___________ is the key to close a selected drop -down list; cancel a command and close a dialog box.

• A. TAB
• B. SHIFT
• C. ESC
• D. F10

Explanation: Esc cancels the current operation, closes an open drop-down list, or dismisses a dialog box. Tab changes focus and F10 generally activates menu-bar focus.

246. An area of a computer that temporarily holds data waiting to be processed is___________?

• A. CPU
• B. Memory
• C. Storage
• D. File

Explanation: Memory, especially RAM, temporarily holds data and instructions waiting for processing by the CPU. Storage keeps data for longer periods, while the CPU performs the processing.

247. The instructions that tell a computer how to carry out the processing tasks are referred to as computer___________?

• A. programs
• B. processors
• C. input devices
• D. memory modules

Explanation: Computer programs are sets of instructions that direct the computer's processing tasks. A processor executes these instructions, but it is not itself the instructions.

248. 1 Byte =___________?

• A. 8 bits
• B. 4 bits
• C. 2 bits
• D. 9 bits

Explanation: A byte is the standard grouping of 8 binary bits. Four bits form a nibble, not a byte.

249. RAM stands for___________?

• A. Random origin money
• B. Random only memory
• C. Read only memory
• D. Random access memory

Explanation: RAM expands to Random Access Memory, because any memory location can be accessed directly in roughly equal time. Read Only Memory is abbreviated ROM, not RAM.

250. Which of the following is also known as brain of computer?

• A. Control unit
• B. Central Processing unit
• C. Arithmetic and language unit
• D. Monitor

Explanation: The CPU is called the computer's brain because it executes instructions and coordinates processing. The control unit is only one component of the CPU, while the monitor is an output device.