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What is the primary purpose of a blockchain explorer?

  • To mine blocks
  • To create smart contracts
  • To provide a user interface for exploring blockchain data
  • To send transactions
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Which of the following is NOT a feature of blockchain?

  • Decentralization
  • Immutability
  • Centralization
  • Transparency
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What is a cryptographic hash function?

  • A function to encrypt data
  • A function to create a digital signature
  • A function to create a unique identifier for data
  • A function to store data
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What is the purpose of a Merkle tree in blockchain?

  • To store blocks
  • To structure data efficiently
  • To create smart contracts
  • To provide security
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Who is known as the creator of Bitcoin?

  • Vitalik Buterin
  • Satoshi Nakamoto
  • Charles Hoskinson
  • Gavin Andresen
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What is the block reward in blockchain?

  • A reward for creating a new block
  • A reward for sending transactions
  • A reward for storing data
  • A reward for validating smart contracts
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Which of the following is NOT a use case for blockchain in business?

  • Supply chain management
  • Healthcare data
  • Creating emails
  • Digital identity verification
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What is a public key in blockchain?

  • A private identifier
  • A type of cryptocurrency
  • A cryptographic key that is publicly available
  • A blockchain address
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What is a peer-to-peer network in blockchain?

  • A network with a central server
  • A network where each participant has equal privileges
  • A private network
  • A type of transaction
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Which of the following best describes a consortium blockchain?

  • Public and open to all
  • Private and controlled by a single organization
  • Controlled by multiple organizations
  • Used only for cryptocurrencies
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What does the term ?51% attack? refer to in blockchain?

  • A bug in the system
  • A consensus mechanism
  • An attack where a group gains majority control of the network
  • A type of transaction
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Which blockchain is known for its focus on privacy and anonymity?

  • Bitcoin
  • Ethereum
  • Monero
  • Litecoin
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What is an oracle in the context of blockchain?

  • A type of cryptocurrency
  • A smart contract
  • A service that provides external data to smart contracts
  • A node
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What is a smart contract?

  • A type of cryptocurrency
  • A self-executing contract
  • A blockchain
  • A cryptographic key
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What is a blockchain?

  • A type of cryptocurrency
  • A digital ledger of transactions
  • A type of database
  • A network protocol
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What is a consensus mechanism?

  • A type of blockchain
  • A type of transaction
  • A process to agree on the state of the blockchain
  • A type of cryptographic key
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What is Proof of Stake?

  • A way to validate transactions based on computational power
  • A way to validate transactions based on ownership of the cryptocurrency
  • A way to create smart contracts
  • A type of cryptographic key
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What is a ledger in the context of blockchain?

  • A type of cryptocurrency
  • A type of block
  • A record of transactions
  • A consensus mechanism
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What does DApp stand for?

  • Decentralized Application
  • Digital Application
  • Distributed Application
  • Decentralized Autonomy
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What is Ethereum?s cryptocurrency called?

  • Ether
  • Ripple
  • Bitcoin
  • Litecoin
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