FREE Cryptocurrency Blockchain Fundamentals Questions and Answers

Question 1

Which of the following best describes the primary function of a hash in a blockchain?

Accepted Answer

To link each new block to the previous one, ensuring immutability and order.

Answer

To encrypt the transaction data within a block for privacy.

Answer

To determine the reward for miners who successfully add a new block.

Answer

To broadcast new transactions to all nodes on the network.

Question 2

A user wants to send cryptocurrency to another user on a public blockchain. Which component is primarily responsible for ensuring the transaction is valid and preventing double-spending before it's added to a block?

Accepted Answer

The consensus mechanism (e.g., Proof of Work).

Answer

Smart contract execution.

Answer

The cryptographic hash of the transaction.

Answer

The distributed ledger's immutability.

Question 3

Which characteristic of blockchain technology makes it particularly resistant to data tampering?

Accepted Answer

The cryptographic linking of blocks and the consensus mechanism.

Answer

Its use of public-key cryptography for user authentication.

Answer

The decentralized nature of its network.

Answer

The high transaction throughput achieved by certain blockchains.

Question 4

In the context of blockchain, what is the primary purpose of a 'node'?

Accepted Answer

To store a copy of the blockchain ledger and validate transactions.

Answer

To serve as a central authority for approving transactions.

Answer

To create new cryptocurrencies through a mining process.

Answer

To provide a user interface for accessing decentralized applications.

Question 5

A developer is designing a new blockchain application where sensitive user data needs to be kept entirely private from the public, but transactions still need to be verifiable. Which type of blockchain would be most suitable for this requirement?

Accepted Answer

A private permissioned blockchain.

Answer

A public permissionless blockchain.

Answer

A consortium or federated blockchain.

Answer

An off-chain layer-2 solution.

Question 6

What is the key difference between a 'hot wallet' and a 'cold wallet' for storing cryptocurrency?

Accepted Answer

Hot wallets are connected to the internet, offering convenience but higher risk; cold wallets are offline, providing greater security.

Answer

Hot wallets support more cryptocurrencies than cold wallets.

Answer

Cold wallets are always hardware devices, while hot wallets are always software-based.

Answer

Cold wallets require a seed phrase for recovery, whereas hot wallets do not.