Blockchain and Smart Contracts Quiz

Which blockchain platform is most widely used for developing smart contracts in Solidity?

• Ethereum

• Hyperledger Fabric

• Ripple

• Corda

Which tool provides a local Ethereum blockchain for testing and development?

• Truffle

• Ganache

• MetaMask

• Web3.js

What is the role of MetaMask in dApp development?

• Backend server for smart contracts

• Tool for compiling Solidity code

• Wallet for interacting with Ethereum blockchain

• Node synchronization manager

In smart contract development, what does 'event handling' refer to?

• Managing token issuance

• Listening for and responding to emitted events from smart contracts

• Logging user data on-chain

• Encrypting communication between frontend and backend

Which library allows frontend applications to communicate with smart contracts?

• Solidity.js

• Web3.js

• Hardhat

• Geth

Which cryptographic technique is primarily used for generating blockchain public-private key pairs?

• RSA

• SHA-256

• Elliptic Curve Cryptography (ECC)

• DES

What is the purpose of zero-knowledge proofs in blockchain systems?

• Encrypting user transactions

• Verifying identities with public keys

• Proving a statement without revealing the underlying data

• Compressing blockchain data

What type of attack exploits flaws in smart contract logic?

• Phishing attack

• Sybil attack

• DNS hijacking

• Reentrancy attack

What is a key benefit of formal verification in smart contract development?

• Increases mining speed

• Proves correctness of contract logic mathematically

• Enhances UI responsiveness

• Prevents wallet hacks

What does a multi-signature wallet require to authorize a transaction?

• A single user key

• Multiple user approvals

• Miner confirmation only

• Smart contract approval