Selected MCQ

Current Question
What is the main goal of blockchain's consensus mechanism?
  • A. To ensure every node has the same data
  • B. To shuffle tokens quickly
  • C. To encrypt all data
  • D. To generate a random number
Correct Answer: A
Explanation:
Consensus mechanisms such as PoW/PoS ensure that all nodes agree on a single history of transactions.
Related Question 1
Which consensus mechanism is generally more energy-efficient in blockchain networks?
  • A. Proof of Work
  • B. Proof of Stake
  • C. Proof of Work-of-Work
  • D. Proof of Space
Correct Answer: B
Explanation:
Proof of Stake does not require intensive mining computations, making it much more energy-efficient than Proof of Work.
Related Question 2
What is the main goal of NASA's Artemis program?
  • A. Send humans to Mars
  • B. Return astronauts to the Moon
  • C. Build a space station on Mars
  • D. Discover exoplanets
Correct Answer: B
Explanation:
Artemis aims to return humans (including the first woman) to the lunar surface.
Related Question 3
What is the main goal of 'dimensionality reduction' techniques like PCA?
  • A. Increase the number of features
  • B. Decrease model accuracy
  • C. Remove irrelevant or correlated features
  • D. Encrypt data
Correct Answer: C
Explanation:
Dimensionality reduction techniques reduce feature count by eliminating redundancy or irrelevance.
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 token in blockchain contexts?
  • A. A physical key
  • B. A digital asset representing value or rights
  • C. A password
  • D. VPN software
Correct Answer: B
Explanation:
In blockchain, a token is a digital unit of value or access rights recorded on the ledger.