Blockchain quiz

What is a blockchain?

• A centralized digital ledge

• A decentralized digital ledger

• A physical chain used in cryptography

• A type of secure communication protocol

What is the origin of blockchain technology?

• Public-key cryptography

• Cryptographically secure hash functions

• Peer-to-peer networks

• Distributed computing

What is the foundation of blockchain technology?

• Merkle trees

• Public-private key pairs

• Consensus algorithms

• Cryptographic signatures

Which of the following is a component of a blockchain?

• Nodes

• Smart contracts

• Cryptocurrency wallets

• All of the above

What is a block in a blockchain?

• A chain of cryptographic keys

• A collection of encrypted transactions

• A decentralized consensus algorithm

• A digital record of transactions

Which type of blockchain allows anyone to join the network, read the transactions, and participate in the consensus process?

• Public blockchain

• Private blockchain

• Consortium blockchain

• Hybrid blockchain

What are some limitations and challenges of blockchain technology?

• Scalability

• Energy consumption

• Regulatory concerns

• All of the above

What is the purpose of a consensus protocol in a blockchain network?

• To verify the identity of participants

• To ensure immutability of the blockchain

• To agree on the order and validity of transactions

• To encrypt the data stored in the blockchain

Which of the following is a consensus protocol used in blockchain?

• Proof of Stake (PoS)

• Delegated Proof of Stake(DPoS)

• Proof of Authority (PoA)

• All of the above

Which consensus protocol requires nodes to have a certain amount of cryptocurrency as a stake to participate in block validation?

• Practical Byzantine Fault Tolerance (PBFT)

• Delegated Proof of Stake (DPoS)

• Proof of Stake (PoS)

• Proof of Authority (PoA)