Computer Science
Multiple Choice
Questions
(MCQs) – Sets 3
with Detailed Explanations
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SET 3 – Computer Science MCQs
✅ No repetition from Set 1 & Set 2
✅ 10 new questions
✅ Each explanation
Level: Class 9–10 / Beginners
1. What is an algorithm?
A. A programming language
B. A step-by-step solution to a problem
C. A hardware device
D. A type of memory
✅ Correct Answer: B
Explanation:
An algorithm is a clear, step-by-step procedure used to solve a problem or perform a task. For example, the steps followed to calculate the average of numbers form an algorithm. Algorithms are important in computer science because they help programmers design efficient and correct programs before writing actual code.
2. Which unit controls all the activities of a computer?
A. ALU
B. Control Unit
C. Memory Unit
D. Input Unit
✅ Correct Answer: B
Explanation:
The Control Unit (CU) is part of the CPU and directs all operations of the computer. It tells the ALU what operations to perform and instructs memory and input/output devices when to act. For example, when running a program, the Control Unit ensures instructions are executed in the correct sequence.
3. What is the smallest unit of data in a computer?
A. Byte
B. Bit
C. Nibble
D. Word
✅ Correct Answer: B
Explanation:
A bit (binary digit) is the smallest unit of data in a computer and can have a value of 0 or 1. Computers use bits to represent all types of data such as numbers, text, images, and videos. Multiple bits together form larger units like bytes and words.
4. Which of the following is secondary storage?
A. RAM
B. Cache
C. Hard Disk
D. Register
✅ Correct Answer: C
Explanation:
Secondary storage is used to store data permanently. A hard disk is an example of secondary storage because it keeps data even when the computer is turned off. Files, software, and operating systems are stored here. Secondary storage has larger capacity compared to primary memory.
5. What does ICT stand for?
A. Information Computer Technology
B. International Communication Technology
C. Information and Communication Technology
D. Internet and Computer Tools
✅ Correct Answer: C
Explanation:
ICT stands for Information and Communication Technology. It includes technologies used to handle information and enable communication, such as computers, mobile phones, the internet, and networks. ICT is widely used in education, business, healthcare, and government services to improve efficiency and communication.
6. Which device is used to convert hard copy into soft copy?
A. Printer
B. Monitor
C. Scanner
D. Speaker
✅ Correct Answer: C
Explanation:
A scanner is an input device that converts printed documents or images (hard copy) into digital form (soft copy). For example, scanning certificates or photos allows them to be stored and shared electronically. Scanners are commonly used in offices, schools, and banks for record keeping.
7. What is a compiler?
A. A hardware device
B. An input unit
C. A program that translates code
D. An operating system
✅ Correct Answer: C
Explanation:
A compiler is a system program that converts high-level programming language code into machine language so the computer can understand it. For example, C or C++ programs require a compiler before execution. It checks errors and translates the entire program at once, improving performance.
8. Which of the following is NOT a characteristic of a computer?
A. Speed
B. Accuracy
C. Intelligence
D. Storage
✅ Correct Answer: C
Explanation:
Computers do not have intelligence or emotions. They only follow instructions given by humans. While computers are fast, accurate, and can store large amounts of data, they cannot think or make decisions on their own. Any output depends entirely on the input and instructions provided.
9. What is a computer network?
A. A single computer system
B. A group of connected computers
C. A software program
D. An input device
✅ Correct Answer: B
Explanation:
A computer network is a collection of computers connected together to share data and resources. For example, school computer labs and office systems use networks to share printers and files. The internet is the largest example of a computer network, connecting millions of computers worldwide.
10. What is the main use of binary numbers in computers?
A. To store images only
B. To represent data using 0 and 1
C. To write programs
D. To print documents
✅ Correct Answer: B
Explanation:
Computers use binary numbers because electronic circuits operate using two states: ON and OFF. These states are represented as 1 and 0. All data, including text, images, audio, and video, is converted into binary form so computers can process and store information efficiently.
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