Computer Science
Multiple Choice
Questions
(MCQs) – Sets 40
with Detailed Explanations
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SET 40 – Computer Science MCQs
✅ No repetition from Sets 1–39
✅ 10 completely new questions
✅ Each explanation
Level: Class 9–10 / Beginners
1. What is an operating system (OS)?
A. Application software
B. Programming language
C. System software that manages computer resources
D. Computer virus
✅ Correct Answer: C
Explanation:
An operating system is system software that controls and manages computer hardware and software resources. It acts as an interface between the user and the computer. Examples include Windows, Linux, and macOS. Without an operating system, a computer cannot function properly.
2. What is multitasking?
A. Single task processing
B. Computer shutdown
C. Running multiple programs at the same time
D. Data deletion
✅ Correct Answer: C
Explanation:
Multitasking allows a computer to run more than one program simultaneously. The operating system switches between tasks quickly, giving the impression of parallel execution. Multitasking improves productivity by allowing users to perform multiple activities at once.
3. What is memory management?
A. Data storage
B. File sharing
C. Process of managing computer memory
D. Software installation
✅ Correct Answer: C
Explanation:
Memory management is a function of the operating system that handles allocation and deallocation of memory to programs. It ensures efficient use of RAM and prevents memory conflicts. Proper memory management helps maintain system performance and stability.
4. What is process?
A. Computer boot
B. Software update
C. Program in execution
D. File folder
✅ Correct Answer: C
Explanation:
A process is a program that is currently being executed by the computer. It includes the program code and its current activity. The operating system manages processes to ensure smooth execution and resource sharing.
5. What is scheduling?
A. Data storage
B. Virus removal
C. Deciding order of process execution
D. Program installation
✅ Correct Answer: C
Explanation:
Scheduling is the method used by the operating system to decide which process runs at what time. It ensures fair CPU usage and improves performance. Different scheduling algorithms help manage system workload efficiently.
6. What is a kernel?
A. User software
B. Application program
C. Core part of operating system
D. Device driver
✅ Correct Answer: C
Explanation:
The kernel is the central part of an operating system. It controls hardware, manages memory, processes, and system calls. The kernel ensures communication between hardware and software, making it the most critical component of an OS.
7. What is device driver?
A. Virus
B. Application
C. Software that controls hardware device
D. Programming language
✅ Correct Answer: C
Explanation:
A device driver is software that allows the operating system to communicate with hardware devices such as printers, keyboards, and monitors. Without drivers, hardware devices cannot function properly with the system.
8. What is booting?
A. System shutdown
B. Installing software
C. Starting the computer system
D. Data backup
✅ Correct Answer: C
Explanation:
Booting is the process of starting a computer and loading the operating system into memory. It occurs when the computer is powered on or restarted. Booting prepares the system for user interaction.
9. What is file system?
A. Hardware device
B. Programming language
C. Method of organizing and storing files
D. Virus
✅ Correct Answer: C
Explanation:
A file system is a method used by the operating system to organize, store, and manage files on storage devices. It helps users easily access, save, and retrieve data. Examples include NTFS and FAT.
10. What is system security?
A. Computer speed
B. Hardware design
C. Protection of computer system from threats
D. Data formatting
✅ Correct Answer: C
Explanation:
System security involves protecting computer systems from unauthorized access, attacks, and damage. It includes user authentication, antivirus tools, and firewalls. Strong system security ensures data safety and reliable system performance.
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