Blockchain Quiz

What is a blockchain?

• A programming language

• A type of cryptocurrency

• A decentralized digital ledger

• A centralized database

Who proposed the concept of blockchain in 1991?

• Satoshi Nakamoto

• Vitalik Buterin

• Hal Finney

• Stuart Haber and W. Scott Stornetta

Which consensus mechanism involves solving complex mathematical problems?

• Proof of Stake

• Proof of Work

• Delegated Proof of Stake

• Proof of Authority

What type of blockchain is controlled by a single organization?

• Consortium Blockchain

• Private Blockchain

• Hybrid Blockchain

• Public Blockchain

Which of the following is an application of blockchain technology?

• Email services

• Cryptocurrencies

• Web hosting

• Social media

What is the primary purpose of mining in blockchain?

• Designing smart contracts

• Creating new cryptocurrencies

• Validating transactions

• Storing data

Which blockchain platform is known for enabling smart contracts?

• Corda

• Bitcoin

• Ethereum

• Hyperledger Fabric

What is a 51% attack?

• A type of smart contract vulnerability

• A regulation on cryptocurrency

• A scenario where one entity controls most of the network's mining power

• A method to increase transaction speed

What is a key challenge of blockchain technology?

• Limited applications

• High transaction fees

• Scalability

• Lack of interest

What does CBDC stand for in the context of blockchain?

• Community Based Decentralized Currency

• Consensus Based Digital Contracts

• Cryptocurrency Blockchain Development

• Central Bank Digital Currency