Computer Science
Multiple Choice
Questions
(MCQs) – Sets 9
with Detailed Explanations
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SET 9 – Computer Science MCQs
✅ New questions (no repetition from Sets 1–7)
✅ 10 MCQs
✅ Each explanation
Level: Class 9–10 / Beginners
1. What is an operating system kernel?
A. Application software
B. The core part of an operating system
C. An input device
D. A programming language
✅ Correct Answer: B
Explanation:
The kernel is the core part of an operating system that manages system resources such as CPU, memory, and devices. It acts as a bridge between hardware and software. For example, when a program needs memory or processor time, the kernel controls access to these resources, ensuring smooth and secure system operation.
2. What is multitasking in computers?
A. Using multiple computers
B. Running one program only
C. Executing multiple tasks at the same time
D. Shutting down programs
✅ Correct Answer: C
Explanation:
Multitasking is the ability of a computer to run multiple programs simultaneously. For example, listening to music while typing a document and browsing the internet. The operating system rapidly switches between tasks, giving the impression that all programs are running at the same time, which improves productivity and efficiency.
3. What is firmware?
A. A computer virus
B. Software stored in ROM
C. Application software
D. Internet service
✅ Correct Answer: B
Explanation:
Firmware is a type of software permanently stored in read-only memory (ROM). It provides low-level control for hardware devices. Examples include BIOS in computers and software in routers or printers. Firmware helps hardware communicate with the operating system and usually does not change frequently.
4. What does DNS stand for?
A. Data Network System
B. Digital Name Service
C. Domain Name System
D. Direct Network Source
✅ Correct Answer: C
Explanation:
DNS stands for Domain Name System. It translates human-readable website names into IP addresses that computers understand. For example, when you type a website name, DNS finds the corresponding IP address so your browser can load the site. DNS makes internet use easier and faster for users.
5. What is a peripheral device?
A. Main processing unit
B. Storage chip
C. External device connected to a computer
D. Operating system
✅ Correct Answer: C
Explanation:
A peripheral device is any external device connected to a computer to provide input, output, or storage. Examples include printers, scanners, webcams, and external hard drives. These devices extend the functionality of a computer and are not part of the core internal components like CPU or RAM.
6. What is a booting process?
A. Installing software
B. Shutting down the computer
C. Starting the computer system
D. Formatting memory
✅ Correct Answer: C
Explanation:
Booting is the process of starting a computer and loading the operating system into memory. It begins when the computer is powered on and ends when the system is ready to use. During booting, hardware is checked and essential system files are loaded to ensure proper functioning.
7. What is a spreadsheet formula?
A. Plain text
B. An image
C. An equation used to calculate values
D. A chart
✅ Correct Answer: C
Explanation:
A spreadsheet formula is an equation used to perform calculations on data in cells. For example, formulas can add numbers, calculate averages, or compare values. In software like Excel, formulas start with an equal sign (=). They help automate calculations and reduce human errors in data processing.
8. What is plagiarism in computing?
A. Writing your own program
B. Using legal software
C. Copying digital content without permission
D. Formatting a document
✅ Correct Answer: C
Explanation:
Plagiarism in computing means copying software, documents, code, or digital content without giving credit to the original creator. It is unethical and often illegal. For example, submitting copied assignments or using pirated software is plagiarism. Avoiding plagiarism promotes honesty and respect for intellectual property.
9. What is a touch screen?
A. Output-only device
B. Input-only device
C. Both input and output device
D. Storage device
✅ Correct Answer: C
Explanation:
A touch screen works as both an input and output device. It displays information and allows users to interact by touching the screen. Smartphones, tablets, and ATMs use touch screens. They improve user interaction by eliminating the need for separate input devices like keyboards or mice.
10. What is digital literacy?
A. Ability to type fast
B. Knowledge of computer hardware only
C. Ability to use digital technology safely and effectively
D. Writing computer programs
✅ Correct Answer: C
Explanation:
Digital literacy is the ability to use computers, the internet, and digital tools safely and effectively. It includes skills like searching information, protecting privacy, evaluating online content, and using software responsibly. Digital literacy is essential in modern education, workplaces, and everyday life.
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