Selected MCQ

Current Question
Which of the following describes a blockchain's immutability feature?
  • A. Anyone can easily alter blocks
  • B. Once recorded, blocks cannot be changed without detection
  • C. Only the first block is immutable
  • D. Transactions expire after 24 hours
Correct Answer: B
Explanation:
The cryptographic linkage of blocks means that modifying any block would be evident across the network, providing immutability.
Related Question 1
What is the key feature of blockchain technology?
  • A. Centralized control
  • B. Tamper-proof decentralized ledger
  • C. Temporary data storage
  • D. Unlimited data throughput
Correct Answer: B
Explanation:
Blockchain uses a distributed ledger with cryptographic links, making it tamper-evident without a central authority.
Related Question 2
Which of the following best describes reinforcement learning?
  • A. Learning from labeled examples
  • B. Learning from unlabeled data via clustering
  • C. Learning through trial-and-error with rewards
  • D. A technique for anomaly detection
Correct Answer: C
Explanation:
Reinforcement learning involves an agent learning to make decisions by receiving rewards or penalties from the environment.
Related Question 3
What is a feature of 6G compared to 5G?
  • A. Slower speed to save energy
  • B. Use of terahertz bands for ultra-high data rates
  • C. Reduced device connectivity
  • D. Only satellite usage
Correct Answer: B
Explanation:
6G research aims to use the terahertz spectrum for even higher speed and capacity
Related Question 4
What ensures blockchain data integrity across nodes?
  • A. Public database
  • B. Hash-linked blocks and consensus
  • C. Encryption keys only
  • D. Trusted server
Correct Answer: B
Explanation:
Blockchain uses cryptographic hashes linking blocks and consensus protocols to maintain integrity.
Related Question 5
What is a key feature of quantum computing that offers computational advantages?
  • A. Using vacuum tubes
  • B. Superposition and entanglement
  • C. Fiber optic circuits
  • D. DC power only
Correct Answer: B
Explanation:
Quantum superposition and entanglement enable certain calculations to be done much faster.