Selected MCQ

Current Question
What is 'Proof of Stake' consensus primarily known for?
  • A. Requiring hardware to solve puzzles
  • B. Assigning validation rights based on stake held
  • C. Using artificial intelligence
  • D. Being unsecure
Correct Answer: B
Explanation:
Proof of Stake grants block validation rights to holders of cryptocurrency stake, using much less energy than PoW.
Related Question 1
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 2
In IoT, what is MQTT primarily used for?
  • A. Hardware design
  • B. Lightweight messaging protocol
  • C. Database management
  • D. Encryption standard
Correct Answer: B
Explanation:
MQTT is a lightweight publish/subscribe messaging protocol widely used in IoT.
Related Question 3
What is 'reinforcement learning' primarily used for?
  • A. Classifying data into labels
  • B. Reducing dimensionality
  • C. Learning to make decisions via rewards
  • D. Clustering unlabeled data
Correct Answer: C
Explanation:
Reinforcement learning is about learning optimal actions based on rewards and penalties from an environment.
Related Question 4
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 5
Which service provides automated application security scanning against known vulnerabilities?
  • A. VPN
  • B. IDS (Intrusion Detection System)
  • C. WAF (Web Application Firewall)
  • D. Antivirus
Correct Answer: C
Explanation:
A Web Application Firewall (WAF) filters and monitors HTTP traffic for vulnerabilities like SQL injection.