Cybersecurity & Blockchain

Question 1

Which feature ensures that once data is written to a blockchain, it cannot be changed?

Accepted Answer

Immutability

Question 2

Which of these is NOT a characteristic of blockchain?

Accepted Answer

Central authority

Question 3

What is a private key used for in cryptocurrency?

Accepted Answer

Authorizing transactions

Question 4

What is a 'smart contract'?

Accepted Answer

A digital agreement that self-executes when conditions are met

Question 5

What is the primary purpose of a blockchain in cryptocurrency?

Accepted Answer

Recording transactions securely

Question 6

What is a blockchain fork?

Accepted Answer

A chain-splitting event

Question 7

What is the gas fee in Ethereum?

Accepted Answer

Transaction processing cost

Question 8

What does 'mining' refer to in the context of blockchain?

Accepted Answer

Validating transactions and adding them to the blockchain

Question 9

Which blockchain platform uses ADA as its native token?

Accepted Answer

Cardano

Question 10

Which of these is a consensus mechanism used in blockchain?

Accepted Answer

Proof of Stake (PoS)

Question 11

Which programming language is primarily used to write Ethereum smart contracts?

Accepted Answer

Solidity

Question 12

Which of these is a popular decentralized exchange (DEX)?

Accepted Answer

Uniswap

Question 13

What kind of attack exploits majority control over a blockchain?

Accepted Answer

51% attack

Question 14

Which cryptocurrency was the first to be created?

Accepted Answer

Bitcoin

Question 15

What does NFT stand for?

Accepted Answer

Non-Fungible Token

Question 16

The smallest unit of Bitcoin is called a:

Accepted Answer

Satoshi

Question 17

Which network upgrade allows Bitcoin to support smart contracts?

Accepted Answer

Taproot

Question 18

What does the term 'decentralized' mean in blockchain?

Accepted Answer

No central authority

Question 19

Who is credited with creating Bitcoin?

Accepted Answer

Satashi Nakamoto

Question 20

Ethereum is most known for enabling:

Accepted Answer

Smart contracts and decentralized apps

Questions 20