Computer Science
Multiple Choice
Questions
(MCQs) – Sets 26
with Detailed Explanations
🎓 Welcome to edusoars.blogspot.com!
Your trusted platform for mastering competitive exams.
We provide a comprehensive and ever-expanding library of Multiple Choice Questions (MCQs) designed not just for practice, but for true conceptual mastery.
What We Cover:
Our expert-curated MCQs span a wide array of high-demand subjects, including:
* Technology & Engineering: Computer Science, Engineering
* Core Academics: Mathematics, Science
* Testing Skills: Aptitude, Reasoning
* General Awareness: General Knowledge
Why Choose Edusoars?
We help you turn practice time into measurable progress:
* Conceptual Clarity: Every single MCQ is accompanied by a detailed, insightful explanation. This is crucial—you don't just learn what the answer is, you understand the concept behind the solution, allowing you to learn effectively from every mistake.
* Realistic Readiness: Test your knowledge with our variety of practice quizzes and simulated tests. They are designed to be as realistic as possible, helping you benchmark your performance and build exam-day confidence.
* Content That Grows: We are constantly adding new material across all subjects, ensuring you always have fresh, relevant content that reflects the latest exam patterns.
> Stop hoping you're prepared. Start knowing you are.
If you are serious about succeeding in your competitive exams, edusoars.blogspot.com is the strategic resource you need to reach your goals.
SET 26 – Computer Science MCQs
✅ No repetition from Sets 1–25
✅ 10 completely new questions
✅ Each explanation
Level: Class 9–10 / Beginners
1. What is data confidentiality?
A. Data deletion
B. Data sharing
C. Protection of data from unauthorized access
D. Data duplication
✅ Correct Answer: C
Explanation:
Data confidentiality ensures that sensitive information is accessible only to authorized users. It prevents data from being exposed to unauthorized individuals or systems. Techniques such as encryption, passwords, and access controls are commonly used to maintain confidentiality, especially in banking, healthcare, and online services.
2. What is encryption?
A. Data copying
B. Data storage
C. Converting data into unreadable form
D. Data deletion
✅ Correct Answer: C
Explanation:
Encryption is the process of converting readable data into an unreadable coded format to protect it from unauthorized access. Only users with the correct decryption key can read the original data. Encryption is widely used in messaging apps, online banking, and secure websites.
3. What is decryption?
A. Data compression
B. Data formatting
C. Converting encrypted data back to readable form
D. Data transfer
✅ Correct Answer: C
Explanation:
Decryption is the reverse process of encryption. It converts encrypted data back into its original readable format using a secret key or password. Decryption ensures that authorized users can access secure data while keeping it protected from unauthorized access during transmission.
4. What is symmetric encryption?
A. Uses two different keys
B. Uses one key for encryption and decryption
C. No key required
D. Only for images
✅ Correct Answer: B
Explanation:
Symmetric encryption uses the same secret key for both encrypting and decrypting data. It is fast and efficient, making it suitable for large amounts of data. However, securely sharing the key between sender and receiver is a major challenge in symmetric encryption systems.
5. What is asymmetric encryption?
A. Uses one key
B. No encryption
C. Uses public and private keys
D. Only text encryption
✅ Correct Answer: C
Explanation:
Asymmetric encryption uses two keys: a public key for encryption and a private key for decryption. It provides higher security than symmetric encryption and is commonly used in secure web communication, email security, and digital certificates such as SSL/TLS.
6. What is hashing?
A. Data encryption
B. Data deletion
C. Converting data into fixed-length value
D. Data sharing
✅ Correct Answer: C
Explanation:
Hashing converts data into a fixed-length string of characters called a hash value. It is a one-way process, meaning original data cannot be retrieved from the hash. Hashing is commonly used for password storage and data integrity verification.
7. What is a digital signature?
A. Handwritten signature
B. Image file
C. Electronic method to verify authenticity
D. Password
✅ Correct Answer: C
Explanation:
A digital signature is an electronic technique used to verify the authenticity and integrity of digital documents. It ensures that a message was sent by a verified sender and has not been altered. Digital signatures are widely used in online contracts and secure communications.
8. What is a public key?
A. Secret password
B. Private information
C. Key shared openly for encryption
D. Antivirus
✅ Correct Answer: C
Explanation:
A public key is part of asymmetric encryption and is shared openly with others. It is used to encrypt data that can only be decrypted using the corresponding private key. Public keys are essential for secure data exchange over the internet.
9. What is a private key?
A. Shared key
B. Backup key
C. Secret key kept by owner
D. Hardware device
✅ Correct Answer: C
Explanation:
A private key is a confidential key used in asymmetric encryption to decrypt data encrypted with the public key. It must be kept secret by the owner. If a private key is compromised, secure communication can be broken, leading to data breaches.
10. What is secure data transmission?
A. Fast data transfer
B. Data compression
C. Safe transfer of data over a network
D. Offline storage
✅ Correct Answer: C
Explanation:
Secure data transmission ensures that data sent over a network is protected from interception and tampering. It uses encryption, authentication, and secure protocols like HTTPS. Secure transmission is essential for online banking, emails, and confidential communications.
Thank you for visiting! We wish you the absolute best of luck in your studies!
