Blockchain Core Concepts Questions and Answers

Question 1

Which of the following core blockchain concepts ensures that once a transaction is recorded on the ledger, it cannot be altered or deleted?

Accepted Answer

Immutability

Answer

Decentralization

Answer

Tokenization

Answer

Scalability

Question 2

A supply chain consortium wants to build a blockchain solution to track goods from manufacturer to retailer. They need to ensure that only authorized participants can view and add transactions. Which type of blockchain would be most suitable for this scenario?

Accepted Answer

Permissioned (Private) Blockchain

Answer

Public Blockchain

Answer

Hybrid Blockchain

Answer

Sidechain

Question 3

What is the primary function of a consensus mechanism in a decentralized blockchain network?

Accepted Answer

To allow all nodes on the network to agree on the validity of transactions and the state of the ledger.

Answer

To encrypt transaction data for privacy.

Answer

To execute the code within a smart contract.

Answer

To generate public and private keys for users.

Question 4

How does cryptographic hashing contribute to the security and integrity of a blockchain?

Accepted Answer

By converting variable-length transaction data into a unique, fixed-length string, making tampering evident.

Answer

By hiding the identities of the transaction participants.

Answer

By determining the monetary value of a cryptocurrency.

Answer

By automatically executing the terms of an agreement.

Question 5

A developer creates a program that automatically releases payment to a freelance worker from an escrow account as soon as the project is marked 'complete' on the platform. What blockchain concept does this program exemplify?

Accepted Answer

Smart Contract

Answer

Proof of Work

Answer

Forking

Answer

Merkle Tree

Question 6

In a Proof of Work (PoW) consensus mechanism, what is the primary role of 'miners'?

Accepted Answer

To compete to solve a complex mathematical puzzle to validate transactions and create new blocks.

Answer

To vote on network governance proposals.

Answer

To stake their cryptocurrency to validate transactions.

Answer

To audit the financial statements of the blockchain project.