BLOCKCHAIN

Which of the following best describes blockchain technology?

• A centralized database managed by a single entity.
• A distributed ledger technology where data is stored across multiple nodes.
• An encryption algorithm used for securing internet communications.
• A type of cloud storage system for storing large datasets.

What is the primary purpose of consensus mechanisms in blockchain networks?

• To achieve scalability by increasing the block size.
• To ensure that all nodes in the network agree on the current state of the ledger.
• To encrypt sensitive data stored on the blockchain.
• To facilitate cross-border payments using digital currencies.

Which of the following is NOT a characteristic of blockchain technology?

• Transparency
• Immutability
• Centralization
• DecentralizationAnswer:

What role do miners play in the process of adding new blocks to the blockchain?

• Validating transactions and adding them to the block.
• Encrypting data stored in each block.
• Deciding the transaction fees for each transaction.
• Auditing the blockchain for security vulnerabilities.

Which consensus mechanism is commonly used in the Ethereum blockchain?

• Proof of Work (PoW)
• Delegated Proof of Stake (DPoS)
• Practical Byzantine Fault Tolerance (PBFT)
• Proof of Authority (PoA)

How does a smart contract differ from a traditional contract?

• Smart contracts are legally binding, while traditional contracts are not.
• Smart contracts are self-executing and automated, while traditional contracts require manual enforcement.
• Smart contracts are stored on a centralized server, while traditional contracts are stored on a blockchain.
• Smart contracts can only be executed by computer programmers, while traditional contracts can be understood by anyone.

Which of the following is NOT a potential application of blockchain technology?

• Supply chain management
• Digital identity verification
• Social media platform
• Voting systems

What is the purpose of hashing in blockchain technology?

• To encrypt sensitive data stored on the blockchain.
• To compress large datasets before storing them on the blockchain.
• To generate unique identifiers for blocks and transactions.
• To facilitate peer-to-peer communication between nodes.

Which of the following best describes the concept of "fork" in blockchain terminology?

• A type of encryption algorithm used to secure transactions.
• A divergence in the blockchain's transaction history, resulting in two separate chains.
• A consensus mechanism used to validate new blocks.
• A hardware device used for storing private keys.

What is the purpose of a Merkle tree in blockchain technology?

• To ensure the chronological order of transactions within a block.
• To encrypt data stored on the blockchain.
• To efficiently verify the integrity of large datasets.
• To facilitate peer-to-peer communication between nodes.