What is blockchain technology?
a) A type of database
b) A distributed ledger technology
c) A centralized computing model
d) A programming language
Which of the following is a key feature of blockchain?
a) Centralized control
b) Transparency and immutability
c) Limited access
d) Slow transaction processing
What does the term “cryptocurrency” refer to in blockchain technology?
a) A digital currency using encryption techniques for secure transactions
b) A new type of physical currency
c) A type of smart contract
d) A method of verifying digital signatures
What is a smart contract in blockchain?
a) A physical contract signed on paper
b) A self-executing contract with the terms of the agreement directly written into code
c) A government-issued legal contract
d) A method of securing private keys
Which consensus mechanism is used in Bitcoin blockchain?
a) Proof of Stake (PoS)
b) Proof of Work (PoW)
c) Delegated Proof of Stake (DPoS)
d) Byzantine Fault Tolerance (BFT)
What is a blockchain node?
a) A single unit of cryptocurrency
b) A computer that participates in the blockchain network
c) A type of cryptographic algorithm
d) A contract on the blockchain
What is a hash function in blockchain?
a) A function that converts data into a fixed-size string of characters, typically used for security
b) A method to organize blockchain blocks
c) A way to generate new cryptocurrencies
d) A way to execute smart contracts
Which of the following is a major benefit of blockchain in supply chain management?
a) Increased transparency and traceability of goods
b) Centralized decision-making
c) Reduced efficiency
d) Increased energy consumption
What is the main advantage of using public blockchains?
a) They offer complete privacy
b) They are accessible to anyone, enhancing decentralization
c) They are more energy-efficient than private blockchains
d) They are controlled by a single entity
What does a blockchain fork refer to?
a) A method of increasing block size
b) A split or divergence in the blockchain protocol
c) A type of consensus mechanism
d) A type of block structure
What is a private key in blockchain?
a) A public identifier for transactions
b) A secret cryptographic key used to sign transactions and access blockchain data
c) A method to create new blocks
d) A type of consensus protocol
Which blockchain is known for being the first cryptocurrency and decentralized network?
a) Ethereum
b) Ripple
c) Bitcoin
d) Litecoin
What is a 51% attack in blockchain security?
a) An attack where a group controls more than 50% of the network’s mining power
b) An attack that increases block sizes by 51%
c) An attack that involves disrupting the smart contracts
d) An attack that encrypts private keys
What is a blockchain transaction?
a) A process of creating new blocks
b) A transfer of digital assets between participants
c) A form of private encryption
d) A way to set network rules
Which of the following is a primary advantage of blockchain in finance?
a) Faster transaction processing
b) Centralized control
c) Lack of security
d) Higher transaction fees
What is the role of miners in blockchain networks?
a) They create smart contracts
b) They validate and add transactions to the blockchain by solving complex cryptographic problems
c) They encrypt data for security
d) They design blockchain protocols
What is a digital wallet in blockchain technology?
a) A physical device that stores cryptocurrencies
b) A program used to store private keys and manage cryptocurrency transactions
c) A service that helps mine cryptocurrency
d) A method to encrypt blockchain data
What does “immutability” in the context of blockchain mean?
a) Transactions can be changed or altered after they are added to the blockchain
b) Transactions once recorded cannot be changed or deleted
c) Transactions are encrypted in a way that allows modification
d) Only administrators can access the blockchain data
What is the main security concern related to blockchain technology?
a) The possibility of quantum computing breaking cryptographic algorithms
b) The difficulty of using blockchain wallets
c) The low energy consumption
d) The inability to track cryptocurrency transactions
Which blockchain platform introduced the concept of smart contracts?
a) Bitcoin
b) Ethereum
c) Ripple
d) Litecoin
What is a consensus algorithm in blockchain?
a) A method for encrypting data
b) A mechanism to achieve agreement on the validity of transactions among distributed nodes
c) A way to store digital assets
d) A tool for measuring blockchain speed
What is the role of encryption in blockchain security?
a) To ensure that blockchain data is readable by anyone
b) To secure the transactions and the identity of participants in the network
c) To increase the number of transactions per second
d) To prevent any public access to blockchain
What is a decentralized application (dApp) in blockchain technology?
a) A central system that stores blockchain data
b) An application built on a decentralized network, often using smart contracts
c) An application that requires a centralized server to function
d) A type of blockchain mining tool
What is the primary difference between public and private blockchains?
a) Public blockchains are permissioned, while private blockchains are permissionless
b) Public blockchains are decentralized, while private blockchains are centralized
c) Private blockchains require less security than public ones
d) Public blockchains are slower and less secure than private blockchains
Which type of attack tries to compromise a blockchain network by exploiting weak points in its consensus mechanism?
a) 51% attack
b) Phishing attack
c) Man-in-the-middle attack
d) Social engineering attack
What is the purpose of a blockchain ledger?
a) To store encrypted keys only
b) To store records of transactions in a secure, immutable way
c) To manage consensus algorithms
d) To increase transaction speed
What is a token in the context of blockchain?
a) A new kind of encryption method
b) A type of cryptocurrency or digital asset that is issued on a blockchain
c) A physical representation of blockchain data
d) A method of increasing blockchain security
What does the term “gas” refer to in the Ethereum blockchain?
a) The computational cost of executing operations on the blockchain
b) The speed at which Ethereum transactions are processed
c) A new type of cryptocurrency used in Ethereum
d) The privacy level of Ethereum transactions
What is the main challenge in scaling blockchain technology?
a) Reducing transaction fees
b) Increasing the speed of block creation while maintaining security
c) Decreasing the number of miners
d) Minimizing the size of blocks
Which of the following is a common use of blockchain technology outside of cryptocurrency?
a) Medical record keeping
b) File encryption
c) Video streaming
d) Social media marketing
