DBATU Remedial Exam MCQ Questions and Answers pdf
DBATU Remedial Exam MCQ Questions and Answers For Blockchain
Here are 30 multiple-choice questions about blockchain along with their answers:
1. What is a blockchain? a) A digital currency b) A distributed ledger technology c) An online marketplace d) A social media platform
2. Which of the following is not a characteristic of blockchain? a) Transparency b) Immutability c) Centralization d) Decentralization 3. Which consensus mechanism is used by Bitcoin? a) Proof of Stake (PoS) b) Proof of Work (PoW) c) Delegated Proof of Stake (DPoS) d) Practical Byzantine Fault Tolerance (PBFT) 4. What is a smart contract? a) A legally binding agreement executed on a blockchain b) A computer program that runs on a blockchain c) A digital wallet for storing cryptocurrencies d) A decentralized exchange for trading tokens 5. What is a private blockchain? a) A blockchain with restricted access and control b) A blockchain that is only accessible with a password c) A blockchain that is not connected to the internet d) A blockchain used for private communications 6. Which blockchain platform is known for its use of Solidity programming language? a) Bitcoin b) Ethereum c) Ripple d) Cardano 7. What is a 51% attack in blockchain? a) A malicious attack that takes control of 51% of the network's computing power b) A software bug that affects 51% of blockchain nodes c) A regulatory requirement for blockchain networks d) A method to enhance blockchain security 8. Which of the following is an example of a public blockchain? a) Hyperledger b) Corda c) Quorum d) Bitcoin 9. What is the purpose of a Merkle tree in blockchain? a) To store cryptographic keys b) To facilitate secure peer-to-peer communication c) To verify the integrity of data in a blockchain d) To control the supply of tokens in a blockchain 10. Which blockchain platform introduced the concept of "decentralized applications" (DApps)? a) Bitcoin b) Ethereum c) Litecoin d) Stellar 11. What is a fork in blockchain terminology? a) A software bug b) A method for joining two different blockchains c) A type of mining hardware d) A consensus mechanism 12. Which of the following is a permissioned blockchain platform? a) Ripple b) EOS c) Tezos d) Hyperledger Fabric 13. What is the role of a miner in a blockchain network? a) To validate transactions and add them to the blockchain b) To create new cryptocurrencies c) To develop smart contracts d) To secure private keys 14. What is the main advantage of using a blockchain for supply chain management? a) Faster transaction processing b) Enhanced data privacy c) Improved traceability and transparency d) Lower operational costs 15. What is the purpose of a nonce in the proof of work (PoW) consensus algorithm? a) To encrypt data in the blockchain b) To ensure the uniqueness of each block c) To authorize transactions on the blockchain d) To calculate the difficulty target for mining 16. Which blockchain platform was developed specifically for the financial industry? a) Corda b) Hyperledger Fabric c) Ethereum d) Stellar 17. What is a private key in blockchain? a) A secret code that grants access to cryptocurrency wallets b) A unique identifier for each transaction on the blockchain c) A consensus mechanism used in private blockchains d) A public address for receiving cryptocurrencies 18. Which of the following is a limitation of blockchain technology? a) High scalability b) Centralized control c) Lack of transparency d) Energy-intensive mining process 19. What is the purpose of a timestamp in a blockchain? a) To track the location of participants b) To determine the order of transactions c) To encrypt data in the blockchain d) To validate smart contracts 20. Which blockchain platform is designed for building enterprise-grade applications? a) Bitcoin b) Ethereum c) Hyperledger Fabric d) Cardano 21. What is the concept of "gas" in the Ethereum blockchain? a) The currency used for transactions on the Ethereum network b) A measure of computing power required to execute smart contracts c) A privacy feature for confidential transactions d) A consensus algorithm used in Ethereum mining 22. What is the primary goal of sharding in blockchain? a) To increase transaction speed and scalability b) To enhance data privacy and security c) To enable cross-chain interoperability d) To eliminate the need for mining 23. What is a "soft fork" in blockchain? a) A temporary network outage b) An upgrade that is backward-compatible with previous rules c) A consensus mechanism that requires a supermajority to validate transactions d) A type of mining hardware 24. Which of the following is a use case for blockchain technology? a) Secure email communication b) Weather forecasting c) Supply chain management d) Social media networking 25. What is the role of a validator in a proof of stake (PoS) consensus algorithm? a) To solve complex mathematical puzzles b) To maintain the network infrastructure c) To create new blocks and validate transactions d) To establish consensus among network participants 26. Which blockchain platform uses the a) Hyperledger Fabric b) Corda c) Quorum d) EOS 27. What is the purpose of a distributed ledger in blockchain? a) To store digital assets like cryptocurrencies b) To enable secure peer-to-peer communication c) To maintain a record of transactions across multiple nodes d) To execute smart contracts 28. Which of the following is a permissionless blockchain platform? a) Ripple b) Stellar c) Cardano d) Litecoin 29. What is the concept of "immutability" in blockchain? a) The ability to update and modify transactions b) The inability to change or alter past transactions c) The requirement for a majority vote to validate transactions d) The process of encrypting data on the blockchain 30. Which blockchain platform introduced the concept of "zero-knowledge proofs" for enhanced privacy? a) Zcash b) Ripple c) EOS d) TezosI hope you find these questions and answers helpful for your learning about blockchain.
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