Computer Science
Multiple Choice
Questions
(MCQs) – Sets 17
with Detailed Explanations
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SET 17 – Computer Science MCQs
✅ No repetition from Sets 1–16
✅ 10 brand-new questions
✅ Each explanation
Level: Class 9–10 / Beginners
1. What is firmware?
A. Application software
B. Hardware device
C. Software stored in permanent memory
D. Internet service
✅ Correct Answer: C
Explanation:
Firmware is a type of software permanently stored in non-volatile memory such as ROM. It provides low-level control for hardware devices and helps them start and operate correctly. Examples include BIOS in computers and software inside printers and routers. Firmware bridges the gap between hardware and software.
2. What is ROM mainly used for?
A. Temporary storage
B. Permanent instructions storage
C. Internet browsing
D. File compression
✅ Correct Answer: B
Explanation:
ROM (Read Only Memory) is used to store permanent instructions needed to start a computer, such as booting programs. Data in ROM is not lost when power is turned off. Because of its stability and reliability, ROM is essential for system startup and basic hardware control.
3. What is a booting process?
A. Shutting down the computer
B. Restarting applications
C. Starting a computer system
D. Installing software
✅ Correct Answer: C
Explanation:
Booting is the process of starting a computer and loading the operating system into memory. It begins when the power is turned on and includes hardware checks and loading system files. Without booting, the computer cannot function or accept user commands.
4. What is a warm boot?
A. Turning on a computer for the first time
B. Restarting the computer without power off
C. Installing new hardware
D. Updating software
✅ Correct Answer: B
Explanation:
A warm boot occurs when a computer is restarted without turning off the power completely. It is commonly done using the restart option. Warm booting is faster than a cold boot and is used to fix minor system issues or apply updates.
5. What is a cold boot?
A. Restarting from sleep mode
B. Shutting down applications
C. Starting the computer from power-off state
D. Logging out of the system
✅ Correct Answer: C
Explanation:
A cold boot happens when a computer is started from a completely powered-off state. It initializes all hardware components and loads the operating system. Cold booting is slower than warm booting but is useful for fixing serious system problems.
6. What is a system crash?
A. Successful execution
B. Software update
C. Sudden failure of a computer system
D. Data backup
✅ Correct Answer: C
Explanation:
A system crash is a sudden failure that causes the computer or software to stop working properly. Crashes may result from hardware faults, software bugs, or overheating. System crashes can lead to data loss, which is why regular backups are important.
7. What is multitasking?
A. Using many computers
B. Running multiple programs at the same time
C. Writing multiple programs
D. Shutting down tasks
✅ Correct Answer: B
Explanation:
Multitasking allows a computer to run multiple programs simultaneously, such as listening to music while browsing the internet. The operating system manages CPU time efficiently between tasks. Multitasking improves productivity and user experience in modern computing systems.
8. What is a user interface?
A. Hardware component
B. Programming language
C. Way users interact with a computer
D. Memory unit
✅ Correct Answer: C
Explanation:
A user interface is the means through which users interact with a computer system. Examples include graphical user interfaces (GUI) with icons and menus, and command-line interfaces (CLI). A good user interface makes systems easy to use and improves user satisfaction.
9. What is GUI?
A. General User Instruction
B. Graphical User Interface
C. Global User Interaction
D. Graphic Utility Input
✅ Correct Answer: B
Explanation:
GUI stands for Graphical User Interface. It allows users to interact with computers using icons, windows, buttons, and menus instead of typing commands. GUIs make computers more user-friendly and accessible, especially for beginners and non-technical users.
10. What is CLI?
A. Computer Language Interface
B. Control Line Input
C. Command Line Interface
D. Central Logic Interface
✅ Correct Answer: C
Explanation:
CLI stands for Command Line Interface. It allows users to interact with the computer by typing text commands. While less visually friendly than GUI, CLI is powerful and efficient for advanced users. It is commonly used in programming, system administration, and server management.
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