What is blockchain technology primarily used for?

A) Creating video games

B) Managing centralized systems

C) Providing a decentralized, secure ledger for digital transactions

D) Sending emails

A blockchain is immutable, meaning once data is recorded, it cannot be altered.

True

False

What consensus mechanism was first used in blockchain technology?

A) Proof of Authority

B) Proof of Stake

C) Proof of Work

D) Delegated Proof of Stake

How are blocks linked together in a blockchain?

A) Via a centralized server

B) By cryptographic hashes

C) Through manual entry

D) By emails

Blockchain technology can only be used for financial applications like Bitcoin.

True

False

In blockchain, what is a ‘node’?

A) A cryptocurrency wallet

B) A central database

C) A participant that validates and stores transactions

D) A type of mining hardware

Which blockchain technology feature helps maintain its security?

A) Centralized control

B) Distributed ledger and cryptographic security

C) Manual transaction verification

D) Physical signatures

Smart contracts are self-executing contracts with the terms of the agreement directly written into code.

True

False

Which industry has been greatly impacted by blockchain technology for improving supply chain transparency?

A) Real estate

B) Logistics and manufacturing

C) Social media

D) Music

Which term refers to the public and private key used in blockchain technology for transaction verification?

A) Block keys

B) Cryptographic pair

C) Key pair

D) Signature locks