Computer Science
Multiple Choice
Questions
(MCQs) – Sets 19
with Detailed Explanations
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SET 19 – Computer Science MCQs
✅ No repetition from Sets 1–18
✅ 10 brand-new questions
✅ Each explanation
Level: Class 9–10 / Beginners
1. What is RAM volatility?
A. Permanent storage
B. Ability to store data forever
C. Loss of data when power is off
D. Data encryption
✅ Correct Answer: C
Explanation:
RAM volatility means that data stored in RAM is temporary and is lost when the computer is powered off. RAM needs continuous power to retain information. This is why unsaved work disappears during power failure. RAM is used for fast access, not long-term storage.
2. What is secondary storage?
A. CPU memory
B. Temporary memory
C. Permanent data storage
D. Cache memory
✅ Correct Answer: C
Explanation:
Secondary storage is used to store data permanently. Devices like hard disks, SSDs, and USB drives are examples. Data remains stored even when the computer is turned off. Secondary storage has larger capacity than primary memory but is slower in speed.
3. What is a file system?
A. Hardware part
B. Method to organize files on storage
C. Internet service
D. Input device
✅ Correct Answer: B
Explanation:
A file system is a method used by an operating system to organize, store, and manage files on storage devices. It keeps track of file names, locations, and access permissions. Examples include FAT32, NTFS, and ext4, which help computers efficiently retrieve and store data.
4. What is defragmentation?
A. Virus removal
B. Data backup
C. Rearranging scattered files
D. Software installation
✅ Correct Answer: C
Explanation:
Defragmentation is the process of rearranging fragmented data on a hard disk so that related pieces are stored close together. This improves system performance by reducing the time needed to read files. Defragmentation is mainly used for traditional hard disk drives.
5. What is a peripheral device?
A. CPU
B. RAM
C. External device connected to a computer
D. Motherboard
✅ Correct Answer: C
Explanation:
A peripheral device is an external device connected to a computer to provide input, output, or storage. Examples include keyboards, printers, scanners, and external drives. Peripheral devices enhance the functionality of a computer system and allow users to interact effectively with it.
6. What is plug and play?
A. Manual setup
B. Automatic device recognition
C. Software installation
D. Virus protection
✅ Correct Answer: B
Explanation:
Plug and play is a feature that allows a computer to automatically recognize and configure hardware devices when they are connected. This eliminates the need for manual installation. Devices like USB keyboards and mice use plug and play technology for quick setup.
7. What is a device driver?
A. Hardware tool
B. Software that controls hardware
C. Programming language
D. Memory unit
✅ Correct Answer: B
Explanation:
A device driver is software that allows the operating system to communicate with hardware devices. Without drivers, hardware like printers or graphics cards cannot function properly. Drivers translate commands between the OS and the device, ensuring smooth and correct operation.
8. What is latency in computing?
A. High speed
B. Data storage
C. Delay in data transfer
D. Data encryption
✅ Correct Answer: C
Explanation:
Latency refers to the delay between sending a request and receiving a response. In computing, lower latency means faster performance. High latency can cause lag in networks, games, or applications. Reducing latency improves user experience and system responsiveness.
9. What is bandwidth?
A. Storage capacity
B. Internet security
C. Amount of data transferred per second
D. Device size
✅ Correct Answer: C
Explanation:
Bandwidth is the maximum amount of data that can be transmitted over a network in a given time. Higher bandwidth allows more data to flow simultaneously, improving speed and performance. It is commonly measured in Mbps or Gbps in networking.
10. What is cloud backup?
A. Local storage
B. Manual copying
C. Online data backup service
D. Virus scanning
✅ Correct Answer: C
Explanation:
Cloud backup is the process of storing copies of data on remote servers over the internet. It protects data from hardware failure, theft, or disasters. Cloud backups allow easy access and recovery from anywhere, making them reliable and secure storage solutions.
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