C4 Mining & Consensus Mechanisms

Question 1

What is the primary function of Proof of Work (PoW) in a blockchain network?

Accepted Answer

To require miners to solve computationally difficult puzzles to validate transactions

Answer

To allow token holders to vote on network upgrades

Answer

To distribute block rewards equally among all network participants

Answer

To verify user identities before allowing transactions

Question 2

What is the primary purpose of cryptocurrency mining?

Accepted Answer

To validate transactions and add new blocks to the blockchain

Answer

To create new wallet addresses for users

Answer

To encrypt user data stored on the blockchain

Answer

To convert fiat currency into cryptocurrency

Question 3

What does 'hash rate' measure in cryptocurrency mining?

Accepted Answer

The speed at which a miner can generate cryptographic hashes per second

Answer

The total number of transactions processed per block

Answer

The percentage of the total network a single miner controls

Answer

The time required to broadcast a block to the network

Question 4

What is a 'nonce' in the context of cryptocurrency mining?

Accepted Answer

A random number miners adjust to find a valid block hash

Answer

A cryptographic key used to sign transactions

Answer

The unique identifier assigned to each wallet address

Answer

A timestamp that records when a block was created

Question 5

Which consensus mechanism did Ethereum adopt following 'The Merge' in September 2022?

Accepted Answer

Proof of Stake (PoS)

Answer

Proof of Work (PoW)

Answer

Delegated Proof of Stake (DPoS)

Answer

Proof of Authority (PoA)

Question 6

What is a mining pool?

Accepted Answer

A group of miners combining computational resources to increase the chance of finding a block

Answer

A hardware wallet shared by multiple users

Answer

A smart contract that distributes mining rewards automatically

Answer

A marketplace where miners sell their computing power to the highest bidder

Question 7

What is a 'block reward halving' in Bitcoin?

Accepted Answer

When the newly created Bitcoin awarded per block is reduced by 50%

Answer

When the block size limit is reduced by 50%

Answer

When transaction fees are capped at half the previous maximum

Answer

When the network difficulty is cut in half due to reduced hash rate