CCE Blockchain Fundamentals 2

Question 1

What is the primary purpose of a Merkle tree in blockchain architecture?

Accepted Answer

To efficiently verify the integrity of large datasets

Answer

To store transaction metadata in plaintext

Answer

To encrypt wallet private keys

Answer

To assign block rewards to miners

Question 2

Which characteristic best describes a 'permissioned' blockchain?

Accepted Answer

Participation requires authorization from a governing entity

Answer

Anyone can read and write without restriction

Answer

Consensus is always achieved via proof-of-work

Answer

All nodes must hold an equal stake in the network

Question 3

In blockchain terminology, what is a 'genesis block'?

Accepted Answer

The very first block in a blockchain

Answer

The block with the highest transaction volume

Answer

The block that closes a difficulty epoch

Answer

A block that contains only coinbase transactions

Question 4

What does 'block finality' mean in the context of blockchain?

Accepted Answer

A confirmed block can never be reversed or altered

Answer

A block's hash meets the current difficulty target

Answer

The last block in a chain before a scheduled hard fork

Answer

A block that holds the maximum allowed transaction count

Question 5

How does a hard fork differ from a soft fork?

Accepted Answer

A hard fork creates a permanent chain split; a soft fork remains backward-compatible

Answer

A hard fork only affects mining nodes while a soft fork affects all nodes

Answer

A hard fork is backward-compatible; a soft fork is not

Answer

Hard forks require miner approval; soft forks require user approval

Question 6

What role does a 'full node' play in a blockchain network?

Accepted Answer

It stores a complete copy of the blockchain and independently validates all rules

Answer

It only downloads block headers to verify transactions

Answer

It exclusively produces new blocks through mining

Answer

It routes transactions between wallets without storing data

Question 7

What is the significance of the 'nonce' field in a blockchain block header?

Accepted Answer

It is a number miners adjust to find a valid proof-of-work hash

Answer

It identifies the miner's wallet address

Answer

It records the total fees collected in the block

Answer

It specifies the block's position in the chain