C4 Blockchain Technology

Question 1

What is a block in the context of blockchain technology?

Accepted Answer

A container for grouped transactions

Answer

A public wallet address

Answer

A transaction timestamp

Answer

A decentralized node

Question 2

What ensures immutability in a blockchain?

Accepted Answer

Cryptographic hashing and consensus

Answer

Open-source licensing

Answer

Cloud storage

Answer

Manual backups

Question 3

What role do nodes play in a blockchain network?

Accepted Answer

They validate and store blockchain data

Answer

They perform data mining

Answer

They store private keys only

Answer

They execute smart contracts

Question 4

Which characteristic of blockchain ensures transparency?

Accepted Answer

Distributed ledger

Answer

Encrypted messages

Answer

Proof-of-Work

Answer

Mining pools

Question 5

What is the purpose of a consensus mechanism in blockchain?

Accepted Answer

To validate transactions and state

Answer

To reward miners

Answer

To update software versions

Answer

To synchronize wallets

Question 6

Which technology allows smart contracts to operate on blockchain?

Accepted Answer

Smart contract logic on blockchain

Answer

HTTP protocol

Answer

Distributed apps

Answer

Cloud scripting engines