Computer Science
Multiple Choice
Questions
(MCQs) – Sets 20
with Detailed Explanations
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SET 20 – Computer Science MCQs
✅ No repetition from Sets 1–19
✅ 10 brand-new questions
✅ Each explanation
Level: Class 9–10 / Beginners
1. What is system software?
A. Games and apps
B. Software that manages computer hardware
C. Internet services
D. User documents
✅ Correct Answer: B
Explanation:
System software is designed to control and manage the computer’s hardware and provide a platform for running application software. Examples include operating systems like Windows and Linux. System software ensures that hardware and software communicate properly, enabling smooth and efficient computer operation.
2. What is application software?
A. Hardware drivers
B. Operating system
C. Software designed for user tasks
D. BIOS
✅ Correct Answer: C
Explanation:
Application software is created to help users perform specific tasks such as writing documents, browsing the internet, or editing photos. Examples include Microsoft Word, web browsers, and media players. Unlike system software, application software directly interacts with users to meet their needs.
3. What is an operating system kernel?
A. User interface
B. Hardware component
C. Core part of an operating system
D. Application program
✅ Correct Answer: C
Explanation:
The kernel is the core part of an operating system that manages system resources such as CPU, memory, and devices. It controls communication between hardware and software. Without the kernel, the operating system cannot function, making it the most essential system component.
4. What is time-sharing?
A. Using one computer per user
B. Allocating CPU time among users or tasks
C. Saving time
D. Data backup
✅ Correct Answer: B
Explanation:
Time-sharing is an operating system technique where CPU time is divided among multiple users or processes. Each task gets a small time slice, creating the illusion of simultaneous execution. Time-sharing improves efficiency and allows multitasking in multi-user systems.
5. What is a real-time operating system (RTOS)?
A. Slow OS
B. Gaming OS
C. OS that responds within fixed time limits
D. Cloud OS
✅ Correct Answer: C
Explanation:
A real-time operating system is designed to process data and respond to inputs within strict time limits. RTOS is used in systems like medical devices, robotics, and traffic control where delayed responses can cause failures. Reliability and speed are critical features of RTOS.
6. What is virtualization?
A. Hardware damage
B. Running multiple OS on one machine
C. Internet browsing
D. File storage
✅ Correct Answer: B
Explanation:
Virtualization is a technology that allows multiple operating systems to run on a single physical computer using virtual machines. It improves resource utilization, reduces hardware costs, and is widely used in data centers, cloud computing, and software testing environments.
7. What is a process in computing?
A. Hardware device
B. Stored file
C. Program in execution
D. Input device
✅ Correct Answer: C
Explanation:
A process is a program that is currently being executed by the computer. It includes program code, current activity, and allocated resources. Operating systems manage processes by scheduling, prioritizing, and allocating resources to ensure smooth multitasking and performance.
8. What is a thread?
A. Hardware unit
B. Subpart of a process
C. Input device
D. Storage unit
✅ Correct Answer: B
Explanation:
A thread is the smallest unit of execution within a process. Multiple threads can exist within a single process, allowing tasks to run concurrently. Threads improve performance and responsiveness, especially in applications like web browsers and multimedia software.
9. What is load balancing?
A. Increasing load
B. Storing data
C. Distributing workloads evenly
D. Power management
✅ Correct Answer: C
Explanation:
Load balancing distributes workloads evenly across multiple servers or resources to prevent overload. It improves performance, reliability, and availability. Load balancing is widely used in networks, cloud computing, and web servers to handle high traffic efficiently.
10. What is fault tolerance?
A. System shutdown
B. Error creation
C. Ability to continue working after failure
D. Data deletion
✅ Correct Answer: C
Explanation:
Fault tolerance is the ability of a computer system to continue operating properly even when some components fail. It is achieved through redundancy and backup systems. Fault tolerance is essential in critical systems like banking, aviation, and healthcare.
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