Blockchain Screen TestBy mfh.officials@gmail.com / January 7, 2025 Blockchain Screening Test 1 / 20 What is the term for a decentralized application (dApp) built on a blockchain platform? Distributed Ledger Smart Contract Blockchain Node Blockchain Application 2 / 20 What is the term for a digital representation of assets or value that exists on a blockchain? Ledger Coin Token Cryptocurrency 3 / 20 Which of the following is NOT a consensus mechanism in blockchain? Proof of Transaction (PoT) Proof of Authority (PoA) Proof of Stake (PoS) Proof of Work (PoW) 4 / 20 What is the role of miners in a blockchain network? To validate and verify transactions To create new blocks only in private blockchains To create new cryptocurrencies To stake cryptocurrency in the network 5 / 20 Which consensus mechanism is used by Bitcoin to validate transactions? Proof of Work (PoW) Delegated Proof of Stake (DPoS) Proof of Stake (PoS) Proof of Authority (PoA) 6 / 20 Which cryptographic technique is used to ensure the integrity and security of transactions in blockchain? Hashing RSA Encryption Public Key Cryptography AES Encryption 7 / 20 What is the primary purpose of a "wallet" in blockchain systems? To store cryptocurrency and public/private keys To validate transactions To mine new blocks To provide encryption to the blockchain network 8 / 20 Which of the following is the primary feature of blockchain technology? Decentralized and immutable ledger Limited scalability Centralized control High transaction fees 9 / 20 Which blockchain platform is primarily used for creating and managing smart contracts and decentralized applications (dApps)? Litecoin Bitcoin Ripple Ethereum 10 / 20 What is the role of a "block header" in a blockchain? To hold the public keys of participants To store user information To store the transactions within a block To identify the previous block and provide metadata for the current block 11 / 20 Which of the following is an example of a blockchain that uses the Proof of Stake (PoS) consensus mechanism? Ethereum 2.0 Bitcoin Ripple Litecoin 12 / 20 Which of the following is a feature of "permissioned" blockchain networks? They use Proof of Work as the consensus mechanism Only authorized participants can access and validate the blockchain They are completely public and accessible by anyone Transactions are anonymous and untraceable 13 / 20 What is the main purpose of a "smart contract" in blockchain technology? To ensure scalability in blockchain networks To facilitate, verify, and enforce the terms of a contract automatically To act as a database To provide encryption for all transactions 14 / 20 In which of the following situations is blockchain most useful? Storing data in a decentralized and tamper-proof manner Sending unencrypted email messages Making high-frequency trades in financial markets Managing cloud storage infrastructure 15 / 20 Which type of attack involves a malicious actor gaining control of more than 50% of a blockchain's network nodes to manipulate the ledger? Double-spending Attack Sybil Attack 51% Attack Eclipse Attack 16 / 20 In blockchain, what is the term used for a block that has been successfully added to the chain? Block confirmation Transaction Hash Node 17 / 20 What is the term used to refer to a public key used in blockchain systems? Private Key Transaction Key Blockchain Key Public Address 18 / 20 Which of the following blockchain platforms was created specifically for creating enterprise solutions and is not primarily a cryptocurrency? Ripple Hyperledger Ethereum Bitcoin 19 / 20 Which of the following is a type of blockchain that only allows authorized participants to join? Hybrid Blockchain Public Blockchain Consortium Blockchain Private Blockchain 20 / 20 Which of the following is an example of an enterprise blockchain platform? Bitcoin Ethereum Litecoin Hyperledger Fabric Your score isThe average score is 50% 0% Restart quiz
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